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1.
Rev. cuba. med. mil ; 50(3): e1336, 2021. tab
Article in Spanish | LILACS, CUMED | ID: biblio-1357306

ABSTRACT

Introducción: En la medicina militar, la aplicación de las sustancias antibacterianas en las infecciones tópicas, es importante en el tratamiento de las tropas. Objetivos: Evaluar el efecto antibacteriano sinérgico de rifamicina en propóleo sobre bacterias grampositivas. Métodos: Estudio experimental in vitro y comparativo. Se efectuó el análisis fitoquímico preliminar del propóleo de Apis mellífera. Se utilizaron 96 placas de agar Muller Hinton (Britania®) (48 placas para cada especie bacteriana) repartidas en 6 grupos (n = 8). grupo I (agua destilada), grupo II (alcohol etílico al 96 por ciento), grupo III (rifamicina al 0,5 por ciento), grupo IV (rifamicina al 1 por ciento), grupo V (propóleo al 20 por ciento) y grupo VI (rifamicina al 1 por ciento en propóleo al 40 por ciento); se empleó la metodología de Kirby - Bauer; las cepas usadas fueron Staphylococcus aureus ATCC 25923, Streptococcus pyogenes ATCC 19615 y las mediciones de las zonas de inhibición se efectuaron a las 24 horas. Resultados: Se detectaron compuestos fenólicos, taninos, flavonoides, alcaloides y triterpenoides en propóleo. Se comprobó el efecto antibacteriano del grupo V con 18,627 ± 0,1008 mm (92,59 por ciento) y 19,247 ± 0,0762 mm (96,74 por ciento), y el efecto antibacteriano sinérgico del grupo VI con 19,316 ± 0,1202 mm (96,02 por ciento) y 19,613 ± 0,0820 mm (98,58 por ciento), comparados con rifamicina al 1 por ciento (100 por ciento) sobre S. aureus ATCC 25923 y S. pyogenes ATCC 19615. Conclusiones: La combinación de rifamicina al 1 por ciento unida al propóleo al 40 por ciento presenta una mayor actividad antibacteriana in vitro sobre bacterias grampositivas debido a su efecto sinérgico(AU)


Introduction: In military medicine, the application of antibacterial substances in topical infections are important in the treatment of troops. Objectives: To evaluate the synergistic antibacterial effect of rifamycin in propolis on gram-positive bacteria. Methods: In vitro and comparative experimental study. Preliminary phytochemical analysis of Apis mellifera propolis was carried out. 96 Muller Hinton agar plates (Britania®) (48 plates for each bacterial species) divided into 6 groups (n = 8) were used group I (distilled water), group II (96 percent ethyl alcohol), group III (rifamycin 0,5 percent), group IV (rifamycin 1 percent), group V (propolis 20 percent) and group VI (rifamycin 1 percent in 40 percent propolis); Kirby-Bauer methodology was used; the strains used were Staphylococcus aureus ATCC 25923, Streptococcus pyogenes ATCC 19615 and the measurements of the zones of inhibition were carried out at 24 hours. Results: Phenolic compounds, tannins, flavonoids, alkaloids and triterpenoids were detected in propolis. The antibacterial effect of group V was verified with 18,627 ± 0,1008 mm (92,59 percent) and 19,247 ± 0,0762 mm (96,74 percent), and the synergistic antibacterial effect of group VI with 19,316 ± 0,1202 mm (96,02 percent) and 19,613 ± 0,0820 mm (98,58 percent), compared with rifamycin 1 percent (100 percent) on S. aureus ATCC 25923 y S. pyogenes ATCC 19615. Conclusions: The combination of rifamycin 1 percent together with propolis 40 percent has a greater antibacterial activity in vitro on gram-positive bacteria due to its synergistic effect(AU)


Subject(s)
Humans , Rifamycins , Gram-Positive Bacteria , Military Medicine , In Vitro Techniques , Anti-Bacterial Agents/analysis
2.
São Paulo; s.n; s.n; 2020. 81 p. tab, graf.
Thesis in Portuguese | LILACS | ID: biblio-1290784

ABSTRACT

Muitos pacientes acometidos por infecções fúngicas sucumbem devido a não eficácia dos antibióticos ou por toxicidade dos mesmos. Anfotericina B é um dos antifúngicos mais eficientes do mercado apesar de sua alta toxicidade, tem estrutura poliênica e é um composto insolúvel em água, sendo necessário o uso de adjuvantes e novas tecnologias para preparo de formulações eficazes. Cetoconazol é um composto imidazólico, também com ação antifúngica de grande espectro de ação e difícil solubilização em meio aquouso, porém solúvel somente em baixos valores de pH. Estudos têm demonstrado a utilização de bixina na preparação de dispersões aquosas de compostos insolúveis ou pouco solúveis em água. Bixina é o principal composto das cascas de semente de Bixa orellana (urucum), sendo um carotenoide insolúvel em água, porém, permite preparações na forma de nanodispersões aquosas com incorporação de fármacos apolares ou lipofílicos. O objetivo deste trabalho foi preparar anfotericina B e cetoconazol na forma de nanodispersões a partir de bixina, utilizando pullulan e trealose como adjuvantes e avaliar estabilidade e eficácia antimicrobiana por ensaios físico-químicos e microbiológicos. Pullulan é um polissacarídeo constituído por unidades de maltotriose, com propriedades adesivas e capacidade de formar biofilmes, enquanto trealose é um composto com duas unidades de glicose, com boa estabilidade em faixas de pH de 3 a 10 e capaz de suportar altas temperaturas, como processos de esterilização por calor úmido. Ensaios físico-químicos demonstraram boa manutenção das características das preparações propostas neste projeto, como, por exemplo, diâmetro hidrodinâmico e potencial zeta das estruturas das nanodispersões de bixina e antifúngicos e também eficácia antimicrobiana frente a Candida albicans ATCC 10231. Os resultados apresentam perspectivas para aprimoramentos de formulações com fármacos pouco solúveis ou insolúveis em água, pesquisa de novos biomateriais e outras aplicações nas áreas farmacêutica e cosmética


Many patients with fungal infections succumb due to ineffectiveness or toxicity of antibiotics. Amphotericin B is one of the most efficient antifungals on the market despite its high toxicity. It presents polyenic structure and is a water-insoluble compound. In this case, it is necessary to use adjuvants and new technologies to prepare effective formulations. Ketoconazole is an imidazolic compound, also with broad spectrum antifungal action and difficult solubilization in aqueous medium but it is soluble at low pH values. Studies have demonstrated the use of bixin in the preparation of aqueous dispersions of insoluble or poorly soluble compounds in water. Bixin is the main compound of Bixa orellana (annatto) seed husks, being a water-insoluble carotenoid, but it allows preparations in the form of aqueous nanodispersions with incorporation of apolar or lipophilic drugs. The objective of this work was to prepare amphotericin B and ketoconazole as nanodispersions from bixin, using pullulan and trehalose as adjuvants and to evaluate them under aspects of stability and efficacy by physicochemical and microbiological assays. Pullulan is a polysaccharide consisting of maltotriose units with adhesive properties and ability to form biofilms, while trehalose is a compound with two glucose units with good stability at pH ranges from 3 to 10 and capable of withstanding high temperatures such as processes of sterilization by moist heat. Physicochemical tests demonstrated good maintenance of the characteristics of the preparations proposed in this project, such as hydrodynamic diameter and zeta potential of bixin and antifungal nanodispersions and also antimicrobial efficacy against Candida albicans ATCC 10231. The results present prospects for improvement. of poorly soluble or water-insoluble drug formulations, research on new biomaterials and other applications in the pharmaceutical and cosmetic fields


Subject(s)
Trehalose , Amphotericin B/agonists , Growth and Development , Ketoconazole/adverse effects , Anti-Bacterial Agents/analysis , Patients , Pharmaceutical Preparations/analysis , Antifungal Agents/pharmacokinetics
3.
Braz. J. Pharm. Sci. (Online) ; 56: e18474, 2020. tab, graf
Article in English | LILACS | ID: biblio-1249171

ABSTRACT

Due to the increase of bacterial resistance, the search for new antibiotics is necessary and the medicinal plants represent its most important source. The aim of this study was to evaluate the antibacterial property of extract and fractions from Protium spruceanum leaves, against pathogenic bacteria. By means of diffusion and microdilution assays, the crude extract was active against the nine bacteria tested being the hydromethanolic fraction the most active. During phytochemical procedures, procyanidin (1) and catechin (2) were identified as the main antibacterial constituents of this fraction. In silico results obtained using PASSonline tool indicated 1 and 2 as having good potential to interact with different targets of currently used antibiotics. These results no indicated potential to none DNA effect and indicated the cell wall as mainly target. Electrophoresis result supported that had no DNA damage. Cell wall damage was confirmed by propidium iodide test that showed increased membrane permeability and by cell surface deformations observed in scanning electronic microscopy. The in vitro assays together with the in silico prediction results establish the potential of P. spruceanum as source of antibacterial compounds that acts on important bacterial targets. These results contribute to the development of natural substances against pathogenic bacteria and to discovery of new antibiotics.


Subject(s)
Plants, Medicinal/adverse effects , In Vitro Techniques/methods , Plant Extracts/analysis , Catechin , Anti-Bacterial Agents/analysis , Computer Simulation , Microscopy, Electron, Scanning/methods , Plant Leaves/classification , Burseraceae/classification , Phytochemicals
4.
Cienc. tecnol. salud ; 7(2): 196-204, 2020. il 27 c
Article in Spanish | LILACS, LIGCSA, DIGIUSAC | ID: biblio-1348153

ABSTRACT

Salmonellosis is a relevant public health threat worldwide. Reptiles are commonly involved in human cases. A microbiological survey was conducted from August to October 2018 to isolate Salmonella bacteria and de-termine if they were resistant to regularly used antibiotics in eight species of pet turtles (Kinosternon acutum sp., K. leucostomum, K. scorpioides, Rhinoclemmys areolata sp., R. pulcherrima, Staurotypus salvinii sp., Trachemys scripta and T. venusta) in Guatemala city, San Lucas Sacatepéquez and Antigua Guatemala. Cloacal swabs were taken from 63 turtles and cultivated in the Microbiology Laboratory at the Veterinary Medicine and Animal Hus-bandry Faculty, University of San Carlos of Guatemala, in Guatemala City. Three samples were positive to the presence of Salmonella sp. One of these isolates (from Trachemys scripta) was resistant to gentamicin, penicillin and amikacin, other isolate (from T. scripta) was partially resistant to amoxicilin + clavulanic acid and penicillin, and other (from T. venusta) to penicillin. These findings highlight the need for better biosecurity practices and show the capacity of bacteria to develop survival strategies that involve resistance to harmful substances like antibiotics.


La salmonelosis es una importante enfermedad zoonótica considerada una amenaza a la salud pública a nivel mundial. Los reptiles están comúnmente involucrados en la transmisión animal-humano. Con el objetivo de determinar la presencia de Salmonella y determinar su resistencia a antibióticos de uso común, se realizó un estudio exploratorio en ocho especies de tortugas (Kinosternon acutum sp., K. leucostomum, K. scorpioides, Rhinoclem-mys areolata sp., R. pulcherrima, Staurotypus salvinii sp., Trachemys scripta y T. venusta) en Guatemala y en San Lucas Sacatepéquez. Se tomaron hisopados cloacales de 63 especímenes y se cultivaron en el Laboratorio de Microbiología de la Facultad de Medicina Veterinaria y Zootecnia de la Universidad de San Carlos de Guatemala. Tres muestras fueron positivas a la presencia de Salmonella sp. Uno de los aislados (de Trachemys scripta) fue resistente a gentamicina, penicilina y amikacina, otro aislado (de T. scripta) fue parcialmente resistente a amoxicilina + ácido clavulánico y a penicilina y un tercer aislado (de T. venusta) a penicilina. Estos hallazgos resaltan la necesidad de mejores prácticas de bioseguridad y muestran la capacidad de las bacterias para desarrollar estrategias de sobrevivencia que involucran la resistencia a sustancias que les son nocivas, como los antibióticos.


Subject(s)
Salmonella/drug effects , Turtles/parasitology , Anti-Bacterial Agents/analysis , Penicillins/adverse effects , Amikacin/adverse effects , Gentamicins/adverse effects , Pets/microbiology
5.
Rev. argent. microbiol ; 51(4): 345-353, dic. 2019. graf
Article in English | LILACS | ID: biblio-1057399

ABSTRACT

Abstract A novel microbiological system in microtiter plates consisting of five bioassays is presented for the detection and classification of antibiotic residues in milk. The bioassays were optimized for the detection of beta-lactams (Bioassay B: Geobacillus stearothermophilus), macrolides (Bioassay M: Bacillus megaterium with fusidic acid), tetracyclines (Bioassay T: B. megaterium with chloramphenicol), quinolones (Bioassay Q: Bacillus licheniformis) and sulfamides (Bioassay QS: B. licheniformis with trimethoprim) at levels near the maximum residue limits (MRL). The response of each bioassay was interpreted visually (positive or negative) after 4-5.5h of incubation. The system detects and classifies beta-lactams (5 pg/l of amoxicillin, 4 pg/l of ampicillin, 36 pg/l of cloxacillin, 22 pg/l of amoxicillin, 3 pg/l of penicillin, 114 pg/l of cephalexin, 89pg/l of cefoperazone and 116 pg/l of ceftiofur), tetracyclines (98 pg/l of chlortetracycline, 92 pg/l of oxytetracycline and 88 pg/l of tetracycline), macrolides (33 pg/l of erythromycin, 44 pg/l of tilmicosin and 50 pg/l of tylosin), sulfonamides (76 pg/l of sulfadiazine, 85 pg/l of sulfadimethoxine, 77 pg/l of sulfamethoxazole and 87pg/l of sulfathiazole) and quinolones (94 pg/l of ciprofloxacin, 98 pg/l of enrofloxacin and 79 pg/l marbofloxacin). In addition, the specificity values were high for B, T, Q (99.4%), M (98.8%) and QS (98.1%) bioassays. The control of antibiotics through this system can contribute to improving the quality and safety of dairy products.


Resumen Se presenta un novedoso sistema microbiológico en placas de microtitulación compuesto por 5 bioensayos para la detección y clasificación de residuos de antibióticos en leche. Los bioensayos fueron optimizados para la detección de betalactámicos (bioensayo B: Geobacillus stearothermophilus), macrólidos (bioensayo M: Bacillus megaterium con ácido fusídico), tetraciclinas (bioensayo T: Bacillus megaterium con cloranfenicol), quinolonas (bioensayo Q: Bacillus licheniformis) y sulfamidas (bioensayo QS: Bacillus licheniformis con trimetoprima), a niveles cercanos a los límites máximos de residuos (LMR). La respuesta de cada bioensayo se interpretó visualmente (positiva o negativa) después de 4 a 5,5 h de incubación. El sistema detecta y clasifica betalactámicos (5 pg/l de amoxicilina, 4 pg/l de ampicilina, 36 pg/l de cloxacilina, 22 pg/l de amoxicilina, 3 pg/l de penicilina, 114 pg/l de cefalexina, 89 pg/l de cefoperazona y 116 pg/l de ceftiofur), tetraciclinas (98 pg/l de clortetraciclina, 92 pg/l de oxitetraciclina y 88 pg/l de tetraciclina), macrólidos (33 pg/l de eritromicina, 44 pg/l de tilmi-cosina y 50 pg/l de tilosina), sulfamidas (76 pg/l de sulfadiacina, 85 pg/l de sulfadimetoxina, 77 pg/l de sulfametoxazol y 87 pg/l de sulfatiazol) y quinolonas (94 pg/l de ciprofloxacina, 98 pg/l de enrofloxacina y 79pg/l de marbofloxacina). Además, los valores de especificidad fueron altos para los bioensayos B, T, Q (99,4%), M (98,8%) y QS (98,1%). El control de residuos de antibióticos mediante este sistema puede contribuir a mejorar la calidad e inocuidad de los productos lácteos.


Subject(s)
Biological Assay/methods , Food Microbiology/methods , Anti-Bacterial Agents/analysis , Sulfonamides/analysis , Tetracycline/analysis , Quinolones/analysis , Macrolides/analysis , Dairy Products , beta-Lactams/analysis
6.
Pesqui. bras. odontopediatria clín. integr ; 19(1): 3962, 01 Fevereiro 2019. ilus, tab
Article in English | LILACS, BBO | ID: biblio-997961

ABSTRACT

Objective: To evaluate the inclusion capacity and bactericidal efficiency of diallyl dimethyl ammonium chloride (PDADMAC) diluted in tetrahydrofuran (THF) upon inclusion in the medical grade silicone polymer structure. Material and Methods: It was diluted the PDADMAC in THF at the concentration of 4wt%. It was included in the silicon paste during its vulcanization process. The contact angle measurements were performed to evaluate whether the biocide inclusion into the silicon paste was successful. All samples were sterilized with gamma radiation at 25KGy-dosage prior to the microbiological tests. Microbiological testing strictly followed the Antibacterial products - Test for antibacterial activity and efficacy JIS Z 2801: 201010 and the used of specific bacteria, as Staphylococcus aureus ATCC 6538P and Escherichia coli ATCC 8739. Results: The results showed that PDADMAC, when dissolved in THF at 4wt%, displayed good incorporation in medical silicone and a broad-spectrum antibacterial response. The results of the tests using Escherichia coli ATCC 8739 and Staphylococcus aureus ATCC 6538P showed that the silicone with no biocide addition did not present antibacterial activity. In contrast, the experimental group plus 2 mL of PDADMAC would have an ideal antibacterial response. Conclusion: Medical grade silicone can be used as a material with antibacterial properties, since it has been able to keep PDADMAC compound attached to its structure, thus acquiring antimicrobial property.


Subject(s)
Silicone Elastomers/analysis , In Vitro Techniques/methods , Maxillofacial Prosthesis , Anti-Bacterial Agents/analysis , Silicone Elastomers , Brazil , Dental Materials , Methylenetetrahydrofolate Reductase (NADPH2)
7.
Arq. bras. oftalmol ; 81(6): 510-513, Nov.-Dec. 2018. graf
Article in English | LILACS | ID: biblio-973857

ABSTRACT

ABSTRACT Purpose: To determine the release profile of moxifloxacin encapsulated in liposomes in the aqueous humor as a controlled release system for intracameral application. Methods: Liposomes containing moxifloxacin were obtained using the lipid film hydration method and were characterized by particle size and encapsulation efficiency. Female rabbits were used for the in vivo profile release study. Liposomes containing moxifloxacin was injected into the anterior chamber of the right eye of each animal. The rabbits were divided into five groups, and a sample of aqueous humor was collected 2, 4, 8, 24, and 48 h after administration of liposomes containing moxifloxacin administration. Moxifloxacin concentrations in the aqueous humor were analyzed using high-performance liquid chromatography. Results: The average size of the liposomes containing moxifloxacin was 60.5 ± 0.72 nm with a particle size distribution of 0.307. The encapsulation efficiency of moxifloxacin in liposomes was 92.24 ± 0.24%. The results of an in vivo release study of liposomes containing moxifloxacin, showed that the maximum moxifloxacin concentration was achieved within the first 2 h after administration (5.27 ± 1.09 mg/mL) and was followed by a decrease in intracameral concentration (0.35 ± 0.05 mg/mL) until the 24 h mark. Conclusions: The in vivo experiments resulted in liposomes containing moxifloxacin that were homogenous in size and exhibited high drug encapsulation efficiency. The results indicate that liposomes containing moxifloxacin offers a satisfactory aqueous humor release profile after intracameral application.


RESUMO Objetivo: Determinar o perfil de liberação, no humor aquoso, de moxifloxacino encapsulado em lipossomas como um sistema de liberação controlada para aplicação intracameral. Métodos: Lipossomas contendo moxifloxacino foram obtidos através do método de hidratação do filme lipídico e caracterizados por tamanho da partícula e eficiência de encapsulação. Utilizaram-se coelhos fêmeas foram para o estudo do perfil de liberação in vivo. Lipossomas contendo moxifloxacino foram injetados na câmara anterior do olho direito de cada animal. Os coelhos foram divididos em cinco grupos, e uma amostra de humor aquoso foi coletada 2, 4, 8, 24 e 48 h após a administração de lipossomas contendo moxifloxacino. As concentrações de moxifloxacino no humor aquoso foram analisadas usando cromatografia líquida de alta eficiência. Resultados: O tamanho médio dos lipossomas contendo moxifloxacino foi de 60,5 ± 0,72 nm com uma distribuição de tamanho de partícula de 0,307. A eficiência de encapsulação de moxifloxacino nos lipossomas foi de 92,24 ± 0,24. Os resultados de um estudo de liberação in vivo de lipossomas contendo moxifloxacino, mostraram que a concentração máxima de moxifloxacino foi atingida dentro das primeiras 2 h após sua administração (5,27 ± 1,09 mg/mL) e foi seguida de um decréscimo na concentração intracameral (0,35 ± 0,05 mg/mL) até a marca de 24 h. Conclusão: Os experimentos in vivo resultaram em lipossomas contendo moxifloxacino que eram homogêneos em tamanho e exibiam alta eficiência de encapsulação do fármaco. Os resultados indicam que lipossomas contendo moxifloxacino oferecem um perfil de liberação de humor aquoso satisfatório após a aplicação intracameral.


Subject(s)
Animals , Female , Rats , Aqueous Humor , Drug Delivery Systems/methods , Moxifloxacin/administration & dosage , Anti-Bacterial Agents/administration & dosage , Biological Availability , Chromatography, High Pressure Liquid , Models, Animal , Injections, Intraocular , Moxifloxacin/analysis , Moxifloxacin/pharmacokinetics , Liposomes , Anti-Bacterial Agents/analysis , Anti-Bacterial Agents/pharmacokinetics
8.
Braz. J. Pharm. Sci. (Online) ; 54(1): e17229, 2018. tab, graf
Article in English | LILACS | ID: biblio-951909

ABSTRACT

ABSTRACT The present study evaluated the antibacterial and antibiofilm activity of carvacrol against Salmonella Typhimurium. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were determined and the time-kill curve and scanning electron microscopy (SEM) were performed to evaluate antibacterial activity. Antibiofilm activity was evaluated by quantifying total biomass using crystal violet assay, and metabolic activity was determined using MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] assay. The action of carvacrol against preformed biofilm on polypropylene and stainless steel was also evaluated by colony counting and SEM. The MIC and MBC was 312 µg mL-1. Carvacrol at MIC and 2 x MIC eliminated cells after 6 and 1 h of treatment, respectively, as exhibited in the time-kill curve. The greatest reduction in biofilm biomass and metabolic activity was 1,719 OD550 and 0,089 OD550 respectively, both at 4 x MIC of carvacrol. In carvacrol treated biofilms of S. Typhimurium on polypropylene, a reduction of 5.12 log was observed with 4 x MIC, while on stainless steel, carvacrol at 4 x MIC reduced bacterial counts by 5 log. The results showed that carvacrol exhibits antibacterial activity and can be used as an alternative for the control of S. Typhimurium biofilms.


Subject(s)
Salmonella typhimurium/immunology , Biofilms , Anti-Bacterial Agents/analysis , Microbial Sensitivity Tests/instrumentation
9.
Univ. med ; 59(3)2018. ilus, tab
Article in Spanish | LILACS, COLNAL | ID: biblio-994968

ABSTRACT

Introducción: la infección por Helicobacter pylori es un problema de salud pública, dada su relación con cáncer gástrico. El incremento de la resistencia bacteriana limita la erradicación efectiva, a pesar del empleo de diferentes esquemas de tratamiento. Métodos: revisión de la literatura en la base de datos Pubmed/Medline entre el 1 de enero de 2015 y el 31 de diciembre de 2016 sobre el manejo del Helicobacter pylori. Resultados: se incluyeron 26 artículos. La terapia secuencial sobresale como opción de tratamiento de primera línea para escenarios como Colombia. La implementación de coadyuvantes puede influir en las tasas de erradicación. Los estudios de epidemiología local y costo-efectividad son escasos. Conclusiones: el uso y conocimiento adecuado de los esquemas de manejo puede disminuir los costos para el sistema, la resistencia antimicrobiana y favorecer la erradicación de patógenos. Se requieren estudios para generar recomendaciones locales.


Introduction: Helicobacter pylori (H. pylori) infection is a public health problem due to its relationship with gastric cáncer The escalation of antibiotic resistance hampers an effective eradication, despite the availability of treatment options. Methods: A review of the literature was performed in the database PubMed between 01/01/2015 and 31/31/2016. Results: Twenty six articles were included. Sequential therapy stands out as a first line therapy for scenarios such as Colombia. The implementation of adjuvants may have a positive impact on eradication rates. Local epidemiólogo- and cost-effectiveness studies are scarce. The results were analized by erradication therapies, coadyuvant treatment, guidelines and outcomes non mentioned in the guidelines. Conclusions: The correct use and knowledge of the different treatment options could reduce the costs for the health systems, the antibiotics resistance and could favor pathogen eradication. Further studies are required for establishing local recommendations.


Subject(s)
Helicobacter pylori/classification , Practice Guidelines as Topic , Combined Modality Therapy/methods , Drug Therapy/methods , Anti-Bacterial Agents/analysis
10.
Cienc. tecnol. salud ; 5(2): 189-195, 2018. ^c27 cm
Article in Spanish | LILACS | ID: biblio-987198

ABSTRACT

La resistencia bacteriana es una amenaza creciente para la salud pública mundial. El mal uso y uso excesivo de antimicrobianos en personas y animales está acelerando este proceso. En el caso de residuos antimicrobianos en productos de origen animal, se sabe que producen reacciones alérgicas, así como inducción de resistencia en bacterias transmitidas por alimentos como Salmonella, Campylobacter y Escherichia coli. Este estudio tuvo como objetivo detectar la presencia de residuos de quinolonas en carne bovina de venta en mercados municipales de la ciudad de Guatemala. Se obtuvieron 161 muestras para análisis. La detección de quinolonas se realizó por metodología de Inmunoensayo Asociado a Enzima (Elisa). Siete de 161 (5%) contenían residuos de quinolonas. Los niveles medios (desviación estándar) detectados fueron 16.497(1.69) µg/kg; ningún límite fue superior al límite máximo residual permitido (100 µg/kg). Este estudio indicó que existen residuos de antibiótico en algunas carnes de res en Guatemala.


Antimicrobial resistance is an increasingly serious threat to global public health. The misuse and overuse of antimicrobials in people and animals is an accelerating factor for this process. In the case of antimicrobial residues in animal origin products, it is known that they cause allergic reactions as well as induction of resistance in bacteria such as Salmonella, Campylobacter and Escherichia coli. This study aimed to find the presence of quinolones residues in beef meat. A total of 161 samples were collected from municipal markets in Guatemala City for analysis. Extraction and determination of quinolones was performed by Enzyme­linked Immunoassay (Elisa) methodology. Seven of 161 (5%) contained quinolone residues. The mean levels (±SE) of quinolones were 16.497(1.69) µg/kg; no limit was superior than the maximum residual limit allowed (100 µg/kg) by FDA. Even though none of the samples exceeded the upper limit it is important that some residues of quinolone were found.


Subject(s)
Quinolones/analysis , Meat/adverse effects , Enzyme-Linked Immunosorbent Assay , Sampling Studies , Food/toxicity , Food Hypersensitivity , Anti-Bacterial Agents/analysis
11.
Hig. aliment ; 31(272/273): 107-111, 30/10/2017.
Article in Portuguese | LILACS | ID: biblio-876331

ABSTRACT

Diversos conservantes naturais têm sido utilizados na inativação de micro-organismos, sem efeitos adversos com relação aos valores nutricionais dos alimentos e da saúde humana. Entretanto, estudos apontam reações adversas aos aditivos sintéticos, tais como reações tóxicas e o possível desenvolvimento de cânceres específicos. A busca por agentes antimicrobianos naturais em alternativa aos conservantes sintéticos tem sido constante; a fim de proporcionar o controle microbiológico e a extensão da vida de prateleira, excluindo, portanto, as desvantagens trazidas pelo uso de aditivos artificiais, através de ação antimicrobiana de óleos essenciais. O objetivo do trabalho foi verificar a ação antibacteriana dos óleos essenciais de café verde e torrado (Coffea arabica), cacau (Theobroma cacao), casca e folha de canela-do- -Ceilão (Cinnamomum zeylanicun) sobre as bactérias Bacillus cereus, Bacillus subtilis, Escherichia coli, Staphylococcus aureus, Salmonella Enteritidis e Salmonella Typhimurium. Os óleos essenciais foram impregnados em discos de papel filtro de 6 mm de diâmetro, próprios para antibiograma; sendo posteriormente colocados em placas de Petri contendo Ágar Nutriente previamente semeado com os micro-organismos. As mesmas foram incubadas a 35°C por 24 e 48 horas. Após este período foi possível observar e medir o diâmetro dos halos e, halos iguais ou superiores a 10 mm foram considerados significativos de atividade antimicrobiana. Os óleos essenciais de cacau, canela casca e canela folha inibiram significativamente todos os micro-organismos testados. E. coli foi inibida significativamente por todos os óleos essenciais. O óleo essencial de canela casca demonstrou os melhores efeitos inibitórios, sendo o mais significativo sobre a E. coli (halo de 36 mm).(AU)


Subject(s)
Humans , Anti-Bacterial Agents/analysis , Food Preservatives/standards , Oils, Volatile/pharmacology , Bacillus cereus/isolation & purification , Food Contamination/prevention & control , Plants, Medicinal , Salmonella/isolation & purification , Staphylococcus aureus/isolation & purification
12.
Arq. bras. oftalmol ; 80(5): 300-303, Sept.-Oct. 2017. tab
Article in English | LILACS | ID: biblio-888140

ABSTRACT

ABSTRACT Purpose: To compare the aqueous humor (AH) concentrations of moxifloxacin 0.5% and gatifloxacin 0.3% solutions alone or when treatment was combined with steroids, and to correlate these concentrations with the minimum inhibitory concentrations (MIC) for the most common endophthalmitis-causing organisms. Methods: Patients undergoing phacoemulsification were enrolled to receive one drop of one of the following solutions: moxifloxacin (G1), moxifloxacin + dexamethasone (G2), gatifloxacin (G3), or gatifloxacin + c (G4), every 15 min, 1h before surgery. AH samples were collected before surgery and analyzed using HPLC-tandem mass spectrometry. Results: The mean antibiotic concentrations in the AH were: G1= 1280.8 ng/mL; G2= 1644.3 ng/mL; G3= 433.7 ng/mL; and G4= 308.1 ng/mL. The mean concentrations statistically differed between G1 and G2 (p=0.01), and G3 and G4 (p=0.008). All samples achieved the MIC for Staphylococcus epidermidis; 100% of the samples from G1 and G2, and 97% from G3 and G4 reached the MIC for fluoroquinolone-sensitive Staphylococcus aureus; 100% of the samples from G1 and G2, 88% from G3, and 72% from G4 reached the MIC for enterococci (p<0.001); and 100% of samples from G1 and G2, 59% from G3, and 36% from G4 reached the MIC for Streptococcus pneumoniae (p<0.001). For fluoroquinolone-resistant S. aureus, 23% from G1, 44% from G2, and no samples from G3 or G4 achieved the MIC (p<0.001). Conclusions: Moxifloxacin + dexamethasone demonstrated a higher concen­tration in the AH than the moxifloxacin alone. Gatifloxacin + steroids demonstrated less penetration into the anterior chamber than gatifloxacin alone. Moxifloxacin was superior to gatifloxacin considering the MIC for enterococci, S. pneumoniae, and fluoroquinolone-resistant S. aureus.


RESUMO Objetivos: Comparar a concentração no humor aquoso entre as soluções de moxifloxacina 0,5% e gatifloxacina 0,3% sozinhas ou combinadas com corticosteroides, e correlacionar a concentração com a concentração inibitória mínima (MIC) para os agentes microbianos mais comumente relacionados a endoftalmites. Métodos: Pacientes que seriam submetidos a cirurgia de catarata foram selecionados para receber 1 gota a cada 15 min, 1 hora antes do procedimento de uma das seguintes soluções: moxifloxacina (G1), moxifloxacina + dexametasona (G2), gatifloxacina (G3) ou gatifloxacina + prednisolona (G4). Amostras do humor aquoso foram coletadas antes do início da cirurgia. Espectrofotometria de massa por HPLC determinou a concentração do antibiótico nas amostras. Resultados: A concentração media de antibiótico nas amostras foram: G1= 1280,8 ng/mL; G2= 1644,3 ng/mL; G3= 433,7 ng/mL; G4= 308,1 ng/mL. Concentração média entre G1 e 2 (p=0,01), e G3 e 4 (p=0,008). Todas as amostras alcançaram MIC para S. epidermidis; 100% das amostras do G1 e 2, e 97% do G3 e 4 atingiram o MIC para S. aureus fluoroquinolona-sensível; 100% das amostras do G1 e 2, 88% do G3 e 72% do G4 atingiram o MIC para Enterococci (p<0,001); e 100% das amostras do G1 e 2, 59% do G3 e 36% do G4 atingiram o MIC para S. pneumoniae (p<0,001). Para o S. aureus resistente a fluoroquinolona, 23% do G1, 44% do G2, e nenhuma das amostras G3 e 4 atingiram o MIC (p<0,001). Conclusão: Moxifloxacina + dexamethasona demonstrou maior concentração no humor aquoso comparado com a moxifloxacina sozinha. Gatifloxacina + esteróide demonstrou menor penetração na câmara anterior comparado a solução de ga­ti­floxacin sem corticóide. A moxifloxacina foi superior a gatifloxacina considerando o MIC para Enterococci, S. pneumoniae e S. aureus fluorquinolona resistente.


Subject(s)
Humans , Male , Female , Middle Aged , Aged , Aged, 80 and over , Aqueous Humor/chemistry , Steroids/analysis , Fluoroquinolones/analysis , Anti-Bacterial Agents/analysis , Reference Values , Staphylococcus aureus/drug effects , Streptococcus pneumoniae/isolation & purification , Microbial Sensitivity Tests , Chromatography, High Pressure Liquid , Enterococcus/isolation & purification , Enterococcus/drug effects , Fluoroquinolones/pharmacology , Tandem Mass Spectrometry , Moxifloxacin , Gatifloxacin , Anti-Bacterial Agents/pharmacology
13.
Dental press j. orthod. (Impr.) ; 22(5): 67-74, Sept.-Oct. 2017. tab, graf
Article in English | LILACS | ID: biblio-891091

ABSTRACT

ABSTRACT Introduction: Plaque accumulation and bond failure are drawbacks of orthodontic treatment, which requires composite for bonding of brackets. As the antimicrobial properties of TiO2 nanoparticles (NPs) have been proven, the aim of this study was to evaluate the antimicrobial and mechanical properties of composite resins modified by the addition of TiO2 NPs. Methods: Orthodontics composite containing 0%, 1%, 5% and 10% NPs were prepared. 180 composite disks were prepared for elution test, disk agar diffusion test and biofilm inhibition test to collect the counts of microorganisms on three days, measure the inhibition diameter and quantify the viable counts of colonies consequently. For shear bond strength (SBS) test, 48 intact bovine incisors were divided into four groups. Composites containing 0%, 1%, 5% and 10% NPs were used for bonding of bracket. The bracket/tooth SBS was measured by using an universal testing machine. Results: All concentration of TiO2 NPs had a significant effect on creation and extension of inhibition zone. For S. mutans and S. sanguinis, all concentration of TiO2 NPs caused reduction of the colony counts. Composite containing 10% TiO2 NPs had significant effect on reduction of colony counts for S. mutans and S. sanguinis in all three days. The highest mean shear bond strength belonged to the control group, while the lowest value was seen in 10% NPs composite. Conclusions: Incorporating TiO2 nanoparticles into composite resins confer antibacterial properties to adhesives, while the mean shear bond of composite containing 1% and 5% NPs still in an acceptable range.


RESUMO Introdução: o acúmulo de placa e as descolagens de braquetes são algumas desvantagens presentes no tratamento ortodôntico, no qual se requer o uso de materiais compósitos para a colagem dos braquetes. Objetivo: tendo em vista que as propriedades antimicrobianas das nanopartículas (NPs) de TiO2 já foram confirmadas, o objetivo do presente estudo foi avaliar as propriedades antimicrobianas e mecânicas de resinas compostas modificadas pela adição de NPs de TiO2. Métodos: compósitos ortodônticos contendo 0%, 1%, 5% e 10% de NPs foram preparados. Cento e oitenta discos de compósito foram preparados para o teste de eluição, o ensaio de difusão em ágar por disco, e o ensaio de inibição da formação de biofilme, para se calcular as contagens de microrganismos ao longo de três dias, medir o diâmetro da inibição e, consequentemente, quantificar as contagens de colônias viáveis. Para o teste de resistência da colagem ao cisalhamento (SBS), 48 incisivos bovinos intactos foram divididos em quatro grupos, nos quais os compósitos contendo 0%, 1%, 5% e 10% de NPs foram utilizados para colagem dos braquetes. A SBS da interface braquete/dente foi medida em uma máquina universal de ensaios. Resultados: todas as concentrações de NPs de TiO2 apresentaram efeito significativo na formação e na extensão da zona de inibição. Para o S. mutans e o S. sanguinis, todas as concentrações de NPs de TiO2 causaram redução na contagem das colônias. O compósito contendo 10% de NPs de TiO2 apresentou uma diminuição significativa na contagem de colônias de S. mutans e S. sanguinis durante os três dias. A média mais alta da SBS foi observada no grupo controle, enquanto o valor mais baixo foi observado para o compósito com 10% de NPs. Conclusões: a incorporação de nanopartículas de TiO2 nas resinas compostas lhes conferiu propriedades antibacterianas, e o valor médio da SBS das resinas contendo 1% e 5% de NPs apresentou-se dentro de uma faixa aceitável.


Subject(s)
Animals , Titanium/pharmacology , Dental Bonding , Composite Resins/pharmacology , Nanoparticles , Anti-Bacterial Agents/pharmacology , Streptococcus mutans/drug effects , Streptococcus sanguis/drug effects , Titanium/analysis , Cattle , Orthodontic Brackets , Composite Resins/chemistry , Dental Enamel/microbiology , Shear Strength , Incisor/microbiology , Anti-Bacterial Agents/analysis
14.
Rev. bras. cir. cardiovasc ; 32(4): 239-244, July-Aug. 2017. tab, graf
Article in English | LILACS | ID: biblio-897930

ABSTRACT

Abstract Objective: To measure the concentration of cefazolin in the anterior mediastinal adipose tissue of patients undergoing cardiac surgery, determining the variation of cefazolin concentration. Methods: Two samples of approximately 1g of subcutaneous tissue were collected from 19 patients who underwent surgery in December 2015: the first sample was collected right after sternotomy and the second one, before sternal synthesis with steel wires. Antibiotic dosage was administered through high performance liquid chromatography. Results: We observed a positive and statistically significant correlation between time 1 and cefazolin concentration (r=0.489 and P=0.039). For time 2 and cefazolin concentration, there was a negative and statistically significant correlation between both variables (r=-0.793 and P<0.001). A negative correlation was also observed between body mass index and cefazolin concentration at time 2 (r=-0.510 and P=0.031). The regression model showed that every 1-minute increase in time 1 corresponded to an increase of 0.240 µg/dL in cefazolin concentration, whereas every 1-minute increase in time 2 corresponded to a reduction of 0.046 µg/dL in cefazolin concentration. As for body mass index, every 1 kg/m2 increase corresponded to a reduction of about 0.510 µg/dL in cefazolin concentration. Conclusion: There was a positive and significant correlation between the initial time of surgery and cefazolin level in the first dosage. The evaluation of the second dosage showed a negative and significant correlation between cefazolin level and the second time of dosage. The concentration of cefazolin is under the influence of body mass index.


Subject(s)
Humans , Male , Female , Adult , Middle Aged , Aged , Cefazolin/analysis , Adipose Tissue/chemistry , Mediastinum , Anti-Bacterial Agents/analysis , Body Mass Index , Cefazolin/administration & dosage , Chromatography, High Pressure Liquid/methods , Cardiac Surgical Procedures , Intraoperative Period , Anti-Bacterial Agents/administration & dosage
15.
Rev. argent. microbiol ; 49(1): 3-6, mar. 2017. ilus, tab
Article in English | LILACS | ID: biblio-1041774

ABSTRACT

Antibiotic resistance results in higher medical costs, prolonged hospital stays and increased mortality and is rising to dangerously high levels in all parts of the world. Therefore, this study aims to search for new antimicrobial agents through bioprospecting of extracts of endophytic fungi from Bauhinia guianensis, a typical Amazonian plant used in combating infections. Seventeen (17) fungi were isolated and as result the methanolic extract of the fungus Exserohilum rostratum showed good activity against the bacteria tested. The polyketide monocerin was isolated by the chromatographic technique, identified by NMR and MS, showing broad antimicrobial spectrum.


La resistencia a los antibióticos conduce a mayores costos médicos, hospitalizaciones prolongadas e incremento de la mortalidad, y está aumentando a niveles peligrosamente altos en todas partes del mundo. Este estudio tuvo como objetivo la búsqueda de nuevos agentes antimicrobianos a través de la bioprospección de extractos de hongos endófitos de Bauhinia guianensis, una planta amazónica típica, utilizada en la lucha contra problemas infecciosos. Fueron aislados 17 hongos; el extracto metanólico del hongo Exserohilum rostratum mostró buena actividad contra las bacterias probadas. Se aisló monocerina policétido por la técnica de cromatografía; este compuesto fue identificado por RM y EM, y mostró un amplio espectro antimicrobiano.


Subject(s)
Bauhinia/microbiology , Endophytes/isolation & purification , Polyketides/isolation & purification , Fungi/drug effects , Anti-Infective Agents/analysis , Anti-Bacterial Agents/analysis , Drug Resistance, Microbial/drug effects , Chromatography/methods , Bioprospecting/methods
16.
Hig. aliment ; 31(264/265): 122-126, 27/02/2017.
Article in Portuguese | LILACS | ID: biblio-833121

ABSTRACT

Conhecidas pelo seu uso na culinária, na medicina, festividades, óleos e ceras aromáticas, perfumes e atualmente como antissépticos, as especiarias são produtos naturais. Produtos aromáticos, poderosos, prazerosos e sensuais. Esses produtos estão marcados na história, como um dos primeiros que percorreram o globo terrestre de um lado ao outro como moeda comercial. Considerando o mencionado, esta pesquisa teve como objetivo verificar a possível ação antibacteriana das especiarias: hibiscus (Hibiscus sabdariffa), kummel (alcaravia)(Carum carvi), gergelim preto (Sesamum indicum), funcho (Foeniculum vulgare) e feno grego (Trigonella foenum-graecum). Os testes foram realizados com as especiarias individualmente e também combinadas. Extratos aquosos das especiarias foram impregnados em discos de papel filtro de 6 mm de diâmetro, próprios para antibiograma, colocados em placas de Petri com meio de cultura apropriado, semeado previamente com os seguintes micro-organismos: Bacillus cereus, Bacillus subtilis, Salmonella Typhimurium, Salmonella Enteritidis e Staphylococcus aureus, posteriormente incubadas a 35°C/24 ­ 48 horas. Após este período, foram considerados de ação antimicrobiana significativa aqueles que apresentaram halos iguais ou superiores a 10mm. Com relação ao micro-organismo B. cereus, foi constatada a ação significativa do extrato de gergelim preto combinado com funcho (halo de 10mm). No que se refere a B. subtilis, os resultados mais significativos foram verificados para o extrato de hibiscus individualmente (halo de 17mm) e também para a combinação entre gergelim preto e feno grego (halo de 10mm). Para a ação sobre S. aureus, destacou-se a combinação entre gergelim preto e feno grego (halo de 13mm). S. Typhimurium foi inibida significativamente pelo extrato de hibiscus individual (halo de 14mm) e pela combinação de hibiscus e feno grego (halo de 12mm). A bactéria inibida significativamente pelo maior número de extratos (6) foi S. Enteritidis, destacando-se a ação do extrato combinado de hibiscus e gergelim preto (halo de 21mm), hibiscus individual (halo de 18mm) e do extrato combinado de hibiscus e feno grego (halo de 14mm). Os melhores resultados foram observados para o extrato de hibiscus individualmente e as suas combinações.


Subject(s)
Humans , Anti-Bacterial Agents/analysis , Condiments , Spices/analysis , Food Contamination/prevention & control , Food Preservation
17.
Electron. j. biotechnol ; 25: 28-32, ene. 2017. tab, graf, ilus
Article in English | LILACS | ID: biblio-1008389

ABSTRACT

Background: The radiation sterilization is one of the best methods for sterilizing vulnerable degradation drugs like cefozopran hydrochloride. Results: Chemical stability of radiosterylized cefozopran hydrochloride, was confirmed by spectrophotometric and chromatographic methods. EPR studies showed that radiation has created some radical defects whose concentration was no more than several dozen ppm. The antibacterial activity of cefozopran hydrochloride irradiated with a dose of 25 kGy was unaltered for Gram-positive bacteria but changed for two Gram-negative strains. The radiation sterilized cefozopran hydrochloride was not in vitro cytotoxic against human CCD39Lu normal lung fibroblast cell line. Conclusions: Cefozopran hydrochloride in solid state is not resistant to radiation sterilization and this method cannot be used for sterilization of this compound.


Subject(s)
Cephalosporins/radiation effects , Anti-Bacterial Agents/radiation effects , Bacteria/drug effects , Microbial Sensitivity Tests , Cell Survival/drug effects , Cephalosporins/analysis , Cephalosporins/pharmacology , Sterilization , Chromatography, High Pressure Liquid/methods , Electron Spin Resonance Spectroscopy , Anti-Bacterial Agents/analysis , Anti-Bacterial Agents/pharmacology
18.
Braz. J. Pharm. Sci. (Online) ; 53(1): e15177, 2017. tab, graf
Article in English | LILACS | ID: biblio-839449

ABSTRACT

Abstract In this study, conditions were optimized for development of a simple RP-HPLC method for simultaneous analysis of gatifloxacin and dexamethasone in different matrices like pharmaceuticals, human serum and urine. Good separation of gatifloxacin and dexamethasone from the induced degradation products was accomplished using C8 as stationary phase; 0.02 M phosphate buffer (pH 3.0) and methanol (42:58 v/v) as mobile phase. The concentration was measured with DAD at 270 nm. Linearity was observed in the range of 0.000040-0.000280 mol/L for gatifloxacin (r2≥0.999) and 0.000013-0.000091 mol/L for dexamethasone (r2≥0.999). Both the analyte peaks were completely separated from the peaks of induced degradation products as indicated by the peak purity index (≥0.9999 for both analytes). The optimized method is recommended to be used for concurrent analysis of gatifloxacin and dexamethasone in different matrices.


Subject(s)
Chromatography, High Pressure Liquid/methods , Drug Stability , Chromatography, Reverse-Phase/methods , Anti-Bacterial Agents/analysis , Dexamethasone/analysis , Validation Study
19.
Rev. peru. med. integr ; 2(4): 823-827, 2017. tab, graf
Article in Spanish | MTYCI, LILACS, MTYCI | ID: biblio-906564

ABSTRACT

Objetivo: Evaluar la eficacia antibacteriana in vitro del alumbre napolitano, adquirido en una herbolaria de la ciudad de Trujillo, sobre cepas de Staphylococcus aureus y Pseudomonas aeruginosa. Materiales y Métodos: Se obtuvo alumbre napolitano natural en una herbolaria comercial, el cual se trituro y diluyo en agua esteril para obtener soluciones con concentraciones al 25%, 50%, 75% y 100%. Estas fueron colocadas en discos de papel filtro y colocadas en placas Petri con cepas de Staphylococcus aureus y Pseudomona aeruginosa. Se utilizó como control positivo la dilución en cloruro de sodio al 0.9% de piperacilina/tazobactam 4/0.5 mg. Se midieron los halos de inhibición obtenidos después de 48 h en mm. Resultados: Los mayores promedios de diámetros en halos de inhibición se encontraron en las soluciones de alumbre napolitano con concentraciones al 100%, en el caso de Staphylococcus aereus (18.7±3.2 mm) y 75% en cepas de Pseudomona aeruginosa (15.0±1.8 mm). Sin embargo, estos fueron menores a los encontrados en el control positivo (68.2±3.7mm y 65.6±4.0 mm, respectivamente). Se observó una relación dosis-dependiente, mayor en los cultivos de Staphylococcus aureus (R2=0.614; p<0.001) que en los cultivos de Pseudomonas aeruginosa (R2=0.483; p<0.001). Conclusión: Se encontró efecto antibacteriano en todas las concentraciones de alumbre napolitano (alumbre de potasio), con los mejores efectos en la concentración al 100% contra las cepas de Staphylococcus aereus y 75% en el caso de las cepas de Pseudomona aeruginosa.


Subject(s)
Humans , Pseudomonas aeruginosa , Staphylococcus aureus , Alum Compounds , Anti-Bacterial Agents/analysis , Peru , Medicine, Traditional
20.
Pesqui. vet. bras ; 36(9): 874-880, set. 2016. tab, graf
Article in Portuguese | LILACS, VETINDEX | ID: biblio-829323

ABSTRACT

Esse estudo objetivou avaliar a composição química e potencial terapêutico do extrato hidroalcóolico de geoprópolis produzidas por abelhas Plebeia aff. flavocincta no semiárido do Rio Grande do Norte. Oito amostras (A-H) foram submetidas a quantificação dos teores de fenóis e flavonoides totais e avaliação da atividade antioxidante através do método DPPH (2,2-difenil-1-picril-hidrazilo). Além disso, foram investigadas as atividades antibacteriana, através do método de difusão em ágar, e a cicatrizante, através da indução de feridas cirúrgicas experimentais em Rattus norvegicus Berkenhout, 1769, linhagem Wistar, tratados com creme à base de geoprópolis. Duas amostras (F e G) se destacaram por apresentar altos valores de fenóis e flavonoides totais. A capacidade antioxidante acima de 90% foi observada em cinco amostras. Os extratos foram considerados eficazes no que se refere a atividade antibacteriana, pois das oito amostras, cinco promoveram a formação de halos de inibição ≥9mm para todas as cepas testadas. Duas amostras (D e G) se destacaram em relação as demais por apresentar excelentes resultados, uma vez que, promoveram a formação de halos de inibição para as bactérias Staphylococcus epidermidis e Escherichia coli, superiores estatisticamente aos valores dos antibióticos controles, quando na concentração de 100%. As amostras A e G promoveram, respectivamente, a formação de halos de inibição, que não diferiram significativamente dos halos produzidos pelos antibióticos controles em todas as concentrações testadas para E. coli e Staphylococcus aureus. A análise do processo de cicatrização sob os pontos de vista clínico, macroscópico e histológico permitiu concluir, que o uso do creme à base de geoprópolis apresentou influência positiva na cicatrização de feridas cutâneas experi­mentais, por promover reação inflamatória menos intensa e fechamento mais rápido das feridas em relação ao grupo controle.(AU)


This study aimed to evaluate the chemical composition and therapeutic potential of the hydroalcoholic extract of geopropolis produced by bees Plebeia aff. flavocincta in Rio Grande do Norte semi-arid. Eight samples (A-H) were submitted to the quantification of total phenols and flavonoid content and evaluation of the antioxidant activity by DPPH method (2,2-diphenyl-1-picryl-hydrazyl). Additionally, antibacterial activities were investigated by agar diffusion method, and healing process by inducing experimental surgical wounds in Rattus norvegicus Berkenhout, 1769, Wistar line, and treated with the geopropolis-based cream. Two samples (F and G) have stood out by presenting high values of total phenols and flavonoids. The antioxidant capacity of over 90% was observed in five samples. The extracts were considered effective in relation to antibacterial activity since of the eight samples, five promoted the formation of inhibition zones ≥9mm above all strains tested. Two samples (D and G) have stood out over the other for presenting excellent results since it promoted the formation of inhibition zones for Staphylococcus epidermidis and Escherichia coli exceeding statistically to the values of the antibiotic controls when the concentration was 100%. Samples A and G have provided, respectively, that the formation of inhibition zones were not significantly different than the halos produced by antibiotics controls at all concentrations tested for Escherichia coli and Staphylococcus aureus. The analysis of the healing process from the clinical, macroscopic and histological points of view, allowed to conclude that the use of geopropolis-based cream had a positive influence on the healing of experimental skin wounds by promoting less intense inflammatory reaction and healing faster from wounds in the control group.(AU)


Subject(s)
Animals , Rats , Anti-Bacterial Agents/analysis , Flavonoids/analysis , Phenols/analysis , Resins/analysis , Bees , Disk Diffusion Antimicrobial Tests , Hymenoptera , Pharmacological Phenomena , Rats, Wistar
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