Antibacterial Activity of Phenolic Compounds in Olive Oil Extracts on Periodontopathogenic Oral Bacteria

ABSTRACT@#Phenolic compounds are secondary metabolites of plants metabolism and can be found in olive oil. They exhibit antimicrobial activity towards both gram-positive and gram-negative bacteria. However, little is known about the antibacterial activity of the compounds towards periodontopathogens. The study aimed to investigate the potential of these compounds as antibacterial agents towards pathogens, specifically Aggregatibacter actinomycetemcomitans, Porphyromonas gingivalis and Fusobacterium nucleatum. Phenolic compounds were extracted from extra virgin olive oil (EVOO) through liquid-liquid separation using methanol:water (70:30), and hexane. It was then prepared in various concentrations to determine its minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) against the periodontopathogens. The anti-adhesion activity was quantified using crystal violet staining while the effects on the morphology were examined through scanning electron microscopy (SEM). The MICs of the phenolic compounds on A. actinomycetemcomitans, P. gingivalis and F. nucleatum were 31.25 mg/mL, 62.5 mg/mL and 125 mg/mL, respectively. The MBCs of the phenolic compounds on A. actinomycetemcomitans and F. nucleatum were 62.5 mg/mL and 125 mg/mL, respectively suggesting this compound can eradicate these bacteria. There was no bactericidal effect on P. gingivalis. The adhesion of all the bacteria was interrupted by the compounds at the lowest concentration (1.95 mg/mL). SEM findings showed disruption of bacterial cell surfaces such as blebs and disintegration of cells after exposure to this extract. Phenolic compounds of olive oil exhibited antibacterial activity against the tested pathogens, with bactericidal effects on A. actinomycetemcomitans and F. nucleatum and bacteriostatic effects on P. gingivalis.

Cross Sectional Survey on Therapeutic Drug Monitoring of Imipenem in Critically Ill Patients of the Real World / 中国药学杂志

OBJECTIVE: To explore the application of therapy drug monitoring of imipenem in ICU, and to provide evidence for the use of imipenem in critically ill patients. METHODS: A cross-sectional survey was conducted to collect clinical data of 67 patients receiving therapeutic drug monitoring of imipenem in ICU from January 1, 2016 to December 31, 2018. Using SPSS21.0 statistical software, 71 cases of therapeutic drug monitoring data (blood drug concentration, f%T>MIC) and related clinical data were analyzed. RESULTS: Of all 71 cases of therapeutic drug monitoring, there are 37 cases (52.11%) f%TMIC≥40%,26 cases(36.62%)f%TMIC70%,and 10 cases(14.08%) f%TMIC=100%. f%TMIC of all cases with 0.25 g q6h were 70%. Among other dosage regimens, the highest proportion of f%T>MIC>40% was 1 g q12h (66.67%) and the highest proportion of f%T>MIC>70% was 0.5 g q8h(43.59%). According to different f%T>MIC, those patients were divided into ≤40% group, >40%-70% group and>70%group. Only group>70% showed a downward trend in the infection index of patients before and after medication. The body temperature decreased significantly (P=0.004), while the average PCT level of group MIC>70% group showed a downward trend in serum creatinine after treatment, but there was no significant difference (P=0.285). The serum drug concentration in CRRT group was slightly higher than that in non-CRRT group, and there was no significant difference in f%T>MIC (P=0.376, P=0.209, P=0.988). CONCLUSION: The level of f%T>MIC of imipenem in ICU is unsatisfactory. For critically ill patients, when imipenem f%T>MIC>70%, the antimicrobial effect is better.

Study on Gene Prokaryotic Expression of Ginkgo biloba Antimicrobial Peptide Protein and Antimicrobial Activity of Its Re- combinant Protein in vivo and in vitro / 中国药房

OBJECTIVE： To obtain Ginkgo biloba antimicrobial peptide （GBA） recombinant protein， and to investigate in vivo/in vitro antimicrobial activity of the protein so as to provide experimental basis for solving bacterial resistance and large-scale production of new plant-derived antimicrobial agents. METHODS： Based on gene technology， according to GBA gene sequence   （FJ 865399） published by Genebank， recombinant expression vector plasmid pET32a（+）-GBA was constructed. Prokaryotic expression of recombinant protein was conducted by Escherichia coli， and then the protein was purified and identified by gel electrophoresis and Western blotting. Drug sensitivity of obtained recombinant protein to E. coli， Staphylococcus aureus， Pseudomonas aeruginosa， Salmonella typhimurium were investigated by Kirby-Bauer test. The minimum antibacterial concentration （MIC） and minimum bactericidal concentration （MBC） were determined by broth dilution method. The protective effects of recombinant protein on S. aureus infection model mice were investigated. RESULTS： Target recombinant protein was expressed successfully and purified （molecular weight of 32 kDa）. The recombinant protein was moderately sensitive to S. aureus and low sensitive to other three bacterias. MIC and MBC of the recombinant protein to S. aureus were （50.00±5.00）mg/mL and（138.33±12.58）mg/mL， and MIC was significantly higher than those to other 3 kinds of bacterias （P＜0.05）. High-dose of recombinant protein （8.0 g/kg） could significantly reduce the S. aureus-induced mortality of mice （P＜0.05）， and had similar protective effect as positive drug penicillin. CONCLUSIONS： Obtained recombinant protein has obvious antimicrobial effects on S. aureus， inhibits E. coli and P. aeruginosa to certain extent and shows poor inhibitive effect on S. typhimurium. High-dose of  recombinant protein shows significant protective effect for S. aureus infection model mice.

Antimicrobial activity of Garcinia mangostana L. ethanol extract against Cutibacterium acnes and Staphylococcus aureus

The purpose of this study was to investigate the antimicrobial activity of the ethanol extract of Garcinia mangostana L. (mangosteen) against Cutibacterium acnes (6 strains) and Staphylococcus aureus (6 strains). The antimicrobial activity of the mangosteen extract was evaluated based on its minimal bactericidal concentration. Cytotoxicity of the mangosteen extract against human embryonic kidney 293 (HEK 293) cells was determined using the cell counting method. The data showed that the mangosteen extract was not toxic to HEK 293 cells at a concentration of up to 16 µg/mL and killed 87.0% and 99.9% of C. acnes and S. aureus after 10 minutes and 1 hour of treatment, respectively. These results suggest that ethanol extract of mangosteen can be used as an anti-acne agent.

Evaluation of antimicrobial, hypotensive and diuretic effect of Eugenia uniflora extracts / Avaliação do efeito antimicrobiano, hipotensivo e diurético de extratos de Eugenia uniflora

The genus Eugenia sp. (Myrtaceae) comprises plants with reported antioxidant and antidiarrheal capability among other therapeutic potentials. The aim of this study was to evaluate the antimicrobial activity of essential oil; diuretic and hypotensive activities of aqueous extracts from leaves of Eugenia uniflora. The antimicrobial activity was evaluated . The diuretic and hypotensive activities were evaluated in normotensive Wistar rats by measuring blood pressure and urine flow after received four different concentrations of aqueous extracts (10%, 15%, 20% and 25%). Essential oil inhibited the growth of Candida parapsilosis and Candida albicans with MIC values lower than 14.41 mg/mL, equal to 57.75 mg/mL for Candida krusei. Among antibacterial effect, essential oil inhibited growth with a MIC equals to 153.93 mg/mL for all strains tested, except for Escherichia coli (MIC equals to 307.96 mg/mL. Aqueous extracts showed powerful reductions of the arterial pressure (34% and 31% lower than the control), after administration of 10% and 25% of aqueous extract, respectively. However, the animals that received the aqueous extract at the 15% and 20% concentrations presented a discrete hypotensive effect (20% and 21% lower than control group, respectively) concomitantly to powerful diuretic effect (280% and 91% higher than control group, respectively). These data confirmed the potential biological effect of this species, and represents an important step toward a depth study on the therapeutic properties of this species

O gênero Eugenia sp. (Myrtaceae) compreende plantas com capacidade antimicrobiana e antioxidante entre outros potenciais terapêuticos. O objetivo deste estudo foi avaliar a atividade antimicrobiana de óleo essencial; atividade diurética e hipotensora de extrato aquoso de folhas de Eugenia uniflora. A atividade antimicrobiana foi avaliada pela determinação da concentração inibitória mínima (MIC) e concentração mínima bactericida (MBC) de cepas bacterianas e concentração fungicida mínima (MFC) para fungos. A atividade diurética e hipotensora foi avaliada em ratos Wistar normotensos pela mensuração da pressão sanguínea e fluxo urinário após administração de quatro diferentes concentrações de extrato aquoso (10%, 15%, 20% e 25%). Óleo essencial inibiu o crescimento de Candida parapsilosis e Candida albicans com valores de MIC menores que 14,41 mg/mL, igual a 57,75 mg/mL para Candida krusei. A respeito do efeito antimicrobiano, o óleo essencial inibiu o crescimento de todas as cepas testadas, com MIC igual a 153,93 mg/mL, exceto para Escherichia coli (MIC igual a 307.96 mg/mL). O extrato aquoso mostrou redução importante da pressão arterial (34% e 31% quando comparado ao controle), após administração de 10% e 25% do extrato aquoso, respectivamente. Contudo, os animais que receberam o extrato aquoso na concentração de 15% e 20% apresentaram discreto efeito hipotensor (20% e 21% menor que o grupo controle, respectivamente) concomitantemente ao importante efeito diurético (280% e 91% maior quando comparado ao grupo controle, respectivamente). Esses achados confirmam o potencial efeito biológico dessa espécie, e representa um importante embasamento para estudos relacionados as propriedades terapêuticas da Eugenia uniflora

Antimicrobial Effect of Acanthopanax sessiliflorum Fruit Extracts against Selected Oral Bacteria / 치위생과학회지

This study aimed to evaluate the antimicrobial effects of Acanthopanax sessiliflorum fruit (ASF; Ogaza) extracts on Streptococcus mutans and Streptococcus sobrinus, which are agents that cause dental caries, and on Streptococcus mitis and Streptococcus salivarius, the microbial flora of the oral cavity. The ASF extracts obtained using 70% ethanol were fractionated in the order of ethyl acetate and n-Butanol, concentrated under reduced pressure, and lyophilized to give powdery solvent extracts. The antimicrobial activity of ASF extracts from each solvent was examined using the disk diffusion method. As a result, only those extracts obtained using an ethyl acetate solvent showed antimicrobial activity. These extracts were selected, and the minimum inhibitory concentration was measured by disk diffusion method at various extract concentrations. Results showed a minimum inhibitory concentration of 32 mg/ml. The viable cell count was measured to confirm the minimum bactericidal concentration. Results showed a minimum bactericidal concentration of 64 mg/ml. In the cytotoxicity test using normal human dermal fibroblast cells, the absorbance value of the test group was similar to that of the control group at 0.64, 1.28, and 6.4 mg/ml. The bacteria and their colonies were examined using a scanning electron microscope. Boundaries between the antimicrobial activity region and non-antimicrobial activity region were observed around the paper disk, which was immersed in the extract with 32 mg/ml concentration. Bacterial colonization was not observed in the area with antimicrobial activity. This finding suggests that ASF extracts can inhibit the growth of some microorganisms in the oral cavity, in addition to the effects of these extracts known to date. In particular, ASF extracts may be used as a preparation for preventing dental caries by adding the extract to the toothpaste or oral mouthwash.

Research progress on chemical constituents and pharmacological activities of Bufonis Venenum / 中草药

Bufonis Venenum, as an important Chinese traditional natural medicine, has complex chemical composition and has been widely used in clinical treatment with significant effects. The chemical constituents in Bufonis Venenum mainly included bufadienolides, indole alkaloids, steriods, etc. With the further research on Bufonis Venenum both at home and abroad, its chemical composition and mechanism of pharmacological activities have been more and more clearly, especially in the aspects of narcotic analgesic, cardiac, and antitumor therapy. This paper reviewed the chemical composition and pharmacology advances of Bufonis Venenum in order to provide reference to clinical use.

Antimicrobial effect of Prunus mume extracts against cariogenic bacteria / 대한구강보건학회지

OBJECTIVES: This study was conducted to determine whether Prunus mume extracts have an antimicrobial effect against Streptococcus mutans (S. mutans) and Streptococcus sobrinus (S. sobrinus). METHODS: The study used crushed and dried Prunus mume, to which 80% methanol was added to obtain extracts. The extracts then underwent a demarcation process, sequentially using hexane, chloroform, and ethyl acetate, all of which have different polarities, followed by a reduction in pressure . The disc diffusion method was then used to measure the clear zone diameter to identify the antimicrobial effect of Prunus mume extracts using the different solvents. The methanol extracts that presented antimicrobial activity against S. mutans and S. sobrinus were then selected, and their optical densities (3, 6, 9, 12, and 24 h after cultivation) were measured to identify growth retardation effects based on extract concentration (0.01, 0.1, 1, and 5 mg/ml). RESULTS: A clear zone was observed in methanol and ethyl acetate for S. mutans when the antimicrobial effect of Prunus mume extracts of each solvent against oral microorganisms was measured via the disc diffusion method. A clear zone was observed in hexane, chloroform, methanol, and ethyl acetate, when the extracts were tested for antimicrobial activity against S. sobrinus. The extract concentration of 1 mg/ml retarded growth with a statistical significance (P<0.05) from 6 h onwards, as determined when the optical density was measured hourly and the growth curves of S. mutans and S. sobrinus were plotted. CONCLUSIONS: Prunus mume extracts retarded the growth of S. mutans and S. sobrinus with increase in time and concentration. Therefore, Prunus mume extracts hold the potential to be used for developing an oral antimicrobial agent to control dental caries.

Interaction of Hydroxyethylidene bisphosphonate (HEBP) with other endodontic irrigants on tissue dissolving capacity and antimicrobial effect

PURPOSE: The purpose of this study was to evaluate tissue dissolving capacity, antimicrobial effect of Hydroxyethylidene bisphosphonate (HEBP) interacting with sodium hypochlorite (NaOCl), Ethylenediaminetetraacetic acid (EDTA) as conventional endodontic irrigants and to determine tissue dissolving efficacy depended on temperature. MATERIALS AND METHODS: A total of 80 bovine muscles were randomly distributed into 8 groups (n = 10). After their initial weights determined on a precision scale, the specimens in each group were immersed in the solutions for 5, 10 and 15 min and reweighted at each time period. Agar diffusion test inoculated with Enterococcus faecalis was performed for antimicrobial effect of each endodontic irrigants. RESULTS: The ability to dissolve organic matter was greater in NaOCl group following NaOCl and HEBP mixture. Heated NaOCl (40℃) and NaOCl/HEBP mixture was greater tissue dissolving efficacy than room temperature (25℃). Antimicrobial effect was greater and significant in the following order EDTA > EDTA + 1% NaOCl > 1% NaOCl ≥ 1% NaOCl + HEBP. CONCLUSION: HEBP as soft chelating agent does not disturb antimicrobial effect and less affected tissue dissolving efficacy as inherent properties of NaOCl. In the heated NaOCl/HEBP mixture analyzed, it dissolved more the organic matter than room temperature.

Antimicrobial effect of platelet‑rich plasma and platelet‑rich fibrin.

Context: Platelet concentrates have been extensively used in a variety of medical fields to promote soft‑ and hard‑tissue regeneration. The significance behind their use lies in the abundance of growth factors (GFs) in platelets α‑granules that promote wound healing. Other than releasing a pool of GFs upon activation, platelets also have many features that indicate their role in the anti‑infective host defense. Aim: The aim of this study is to evaluate the antimicrobial activities of platelet‑rich plasma (PRP) and platelet‑rich fibrin (PRF) against periodontal disease‑associated bacteria. Subjects and Methods: Blood samples were obtained from ten adult male patients. PRP and PRF were procured using centrifugation. The antimicrobial activity of PRP and PRF was evaluated by microbial culturing using bacterial strains of Porphyromonas gingivalis and Aggregatibacter actinomycetemcomitans. Results: P. gingivalis and A. actinomycetemcomitans were inhibited by PRP but not by PRF. Conclusions: PRP is a potentially useful substance in the fight against periodontal pathogens. This might represent a valuable property in adjunct to the enhancement of tissue regeneration.

Antimicrobial effect of Malaysian green tea leaves (Camellia sinensis) on the skin microbiota

Aims: Camellia sinensis ( green t ea) is known for its therapeutic properties (anti - inflammatory, anti - oxidative and anti - ageing). The aim of this study was to determine the in vitro inhibitory activity of gree n tea extract on some odorous skin commensal bacteria. Methodology and results: Tea leaves were collected from MARDI Agro Technology Park, Cameron Highlands. A standardised protocol was used to obtain green tea extract. Aqueous green tea extracts were tes ted for antibacterial activity by well diffusion method. Minimal inhibitory concentration (MIC) and minimal bactericidal concentration (MBC) assays were performed by broth microdilution assays using green tea extract concen trations from 16 to 0.0313 mg/ mL . Green tea extract showed antibacterial activity against skin microbiota. The high antimicrobial effect was achieved against Micrococcus luteus with MIC and MBC of 0.125 and 0.25 mg/μL respectively, followed by Staphylococcus epidermidis with MIC and MBC o f 0.25 and 0.25 mg/μL respectively, Bacillus subtilis with MIC and MBC of 0.5 and 0.5 mg/μL respectively and lastly, Corynebacterium xerosis with MIC and MBC of 0.5 and 1.0 mg/μL respectively. Conclusion, significance and impact of study: The results obta ined from the study confirm the in vitro anti - microbial activity of green tea extracts against skin microbiota. The antibacterial effects of green tea against skin bacteria with its anti - oxidant and anti - aging properties will help in keeping skin healthy, fresh and reducing unpleasant odo rs .

Antimicrobial effects of biosynthesized silver nanoparticles produced by Actinomyces spp. based on their sizes and shapes

Aims: Actinomyces are dominant soil microflora with potent activity for production of several enzymes and metabolites. In order to increase their survival in the environment these bacteria detoxify the metal ions and consequently produce the nanoparticles. The present study was undertaken to isolate Actinomyces strains from soil samples and their evaluation for the production of silver nanoparticles with antimicrobial property. Methodology and results: Two hundred soil samples were collected and subjected to isolation and identification (based on16SrRNA gene sequencing) of silver nanoparticles producing Actinomyces. The silver nanoparticles produced by Actinomyces were confirmed by UV-visible spectral analysis, scanning electron microscope (SEM) and Inductively Coupled Plasma (ICP). Furthermore, antimicrobial property of silver nanoparticles was assessed against pathogenic microorganisms viz., Staphylococcus aureus (PTCC 1431), Acinetobacter baumannii (PTCC 19606), Bacillus cereus (PTCC 1816), Escherichia coli (PTCC 1397), Salmonella typhi (PTCC 1609), Pseudomonas aeruginosa (PTCC 1707), Aspergillus niger (PTCC 5010) and Candida albicans (PTCC 5072). Of 48 Actinomyces isolated, 26 strains could produce silver nanoparticles and three of which showed potent activity for production of silver nanoparticles. Molecular identification of these strains exhibited detection of Actinomyces amycolicicoccus subflavus, Streptomyces flavoviridis and Streptomyces lateritius. The results obtained from characterization of the biosynthesis silver nanoparticles illustrated that their shapes and sizes were spindle and spherical and 47-103 nm respectively. However, the antimicrobial effect of silver nanoparticles against the pathogenic microorganisms was varied. Yet S. typhi followed by P. aeruginosa, were more sensitive and A. baumannii was relatively less sensitive. In addition, spherical shape with small average size relatively showed more antimicrobial property. Conclusion, significance and impact of study: Soil Actinomyces could produce silver nanoparticles and these particles have antimicrobial effect. In addition, the antimicrobial effect of silver nanoparticles, not only because of their chemical property (such as formation of free radical) but also depended on their shapes and sizes.

Antimicrobial effect of topical local anesthetic spray on oral microflora

BACKGROUND: To evaluate the antimicrobial activity of lidocaine (LD) topical anesthetic spray against oral microflora. METHODS: Antimicrobial effects of 10% LD spray were assessed against six bacterial cultures obtained from volunteers: Escherichia coli, Enterococcus faecalis, Staphylococcus aureus, Streptococcus salivarius, Streptococcus pyogenes, and Streptococcus sanguinis. The filter papers contained 50-µl LD, brain heart infusion (BHI) broth, or 0.2% chlorhexidine. Papers were placed on the cultured blood plates for 1-3 min. After the papers were removed, plates were incubated for 24 h. Bacterial growth on the contact areas was recorded as the antimicrobial score. The split mouth technique was use in for sample collection in clinical study. Filter papers soaked with either BHI broth or LD were placed on the right or left buccal mucosa for 1 min, and replaced with other papers to imprint biofilms onto the contact areas. Papers were placed on blood plates, incubated for 24 h, and antimicrobial scores were determined. Experiments were conducted for 2- and 3-min exposure times with a 1-day washout period. RESULTS: LD exhibited bactericidal effects against E. coli, S. sanguinis, and S. salivarius within 1 min but displayed no effect against S. aureus, E. faecalis, and S. pyogenes. The antimicrobial effect of LD on oral microflora depended upon exposure time, similar to the results obtained from the clinical study (P < 0.05). LD showed 60-95% biofilm reduction on buccal mucosa. CONCLUSIONS: Antimicrobial activity of 10% LD topical anesthetic spray was increased by exposure time. The 3 min application reduced oral microflora in the buccal mucosa.

Antimicrobial Effect of Low Temperature Atmospheric Plasma against Oral Pathogens

The purpose of this study was to investigate the antibacterial effect of the low temperature atmospheric plasma device with needle tip designed for easy approach to the oral cavity and root canal against Streptococcus mutans, Enterococcus faecalis and Candida albicans. The antibacterial activities evaluated by measuring clear zone of agar plate smeared with each bacteria after plasma treatment. To quantify antibacterial effects, dilution plate method was used. In addition, scanning electron microscope (SEM) was used for observation of changes in bacterial morphology. As treatment time of plasma increased, the clear zone was enlarged. The death rate was more than 99%. The SEM results showed that the globular shape of bacteria was distorted. These results suggest that needle tip plasma could be an innovative device for prevention of dental caries, and treatment of apical infection and soft tissue diseases.

Antimicrobial effect of calcium hydroxide as an intracanal medicament in root canal treatment: a literature review - Part II. in vivo studies

The first part of this study reviewed the characteristics of calcium hydroxide (Ca(OH)2) and summarized the results of in vitro studies related to its antimicrobial effects. The second part of this review covers in vivo studies including human clinical studies and animal studies. The use of Ca(OH)2 as an intracanal medicament represented better histological results in animal studies. However, human clinical studies showed limited antimicrobial effects that microorganisms were reduced but not eliminated through the treatment, and that some species had resistance to Ca(OH)2. Most of clinical outcome studies supported that there is no improvement in healing of periapical lesions when Ca(OH)2 was applied between appointments. Further studies are required for the antimicrobial effects of Ca(OH)2, and search for the ideal material and technique to completely clean infected root canals should be continued.

Antimicrobial effect of calcium hydroxide as an intracanal medicament in root canal treatment: a literature review - Part II. in vivo studies

The first part of this study reviewed the characteristics of calcium hydroxide (Ca(OH)2) and summarized the results of in vitro studies related to its antimicrobial effects. The second part of this review covers in vivo studies including human clinical studies and animal studies. The use of Ca(OH)2 as an intracanal medicament represented better histological results in animal studies. However, human clinical studies showed limited antimicrobial effects that microorganisms were reduced but not eliminated through the treatment, and that some species had resistance to Ca(OH)2. Most of clinical outcome studies supported that there is no improvement in healing of periapical lesions when Ca(OH)2 was applied between appointments. Further studies are required for the antimicrobial effects of Ca(OH)2, and search for the ideal material and technique to completely clean infected root canals should be continued.

Antimicrobial Effect of Coptidis rhizome Extract against Mutans Streptococci and Periodontopathogens

The purpose of the study was to investigate the antimicrobial activity of the methanol extract of Coptidis rhizome against the type strains of cariogenic bacteria, Streptococcus mutans and Streptococcus sobrinus, and the periodontopathogens, Porphyromonas gingivalis, Prevotella intermedia, Treponema denticola and Aggregatibacter actinomycetemcomitans. The antimicrobial activities of the crude extract and the methanol extract fractions of Coptidis rhizome separated by silica gel chromatography were evaluated by determining the minimal bactericidal concentration (MBC) values, using the microdilution method. The cell viability test of the extracts of Coptidis rhizome on the KB cells was also studied by methyl thiazolyl tetrazolium (MTT) assay. Our results showed that the 11th fraction (F11) of the methanol extract had the greatest antimicrobial activity against the tested bacteria, with no associated cytotoxicity on the KB cells, upto a concentration of 50 microg/ml. These results suggest that the silica gel chromatography fraction F11 of the methanol extract of Coptidis rhizome, could be useful in the development of oral hygiene products as an antimicrobial agent for the prevention of dental caries and periodontal diseases.

Effect of a Surfactant on the Antimicrobial Activity of Sodium Hypochlorite Solutions

The objective of the present study was to evaluate the antimicrobial activity of sodium hypochlorite (NaOCl) associated with a surfactant. Seventy single-rooted extracted human teeth were inoculated with Enterococcus faecalis, and incubated for 21 days (37 °C). The groups were distributed according to the irrigation solution used during root canal preparation: 5%, 2.5% and 1% NaOCl; 5%, 2.5% and 1% Hypoclean(r), a solution containing a surfactant (cetrimide) associated with NaOCl. Three microbiological samples were collected from each tooth: S1 - before instrumentation; S2 - immediately after instrumentation; and S3 - after a seven-day period. Data were submitted to ANOVA and Tukey test with 5% significance level. The results showed that immediately after root canal preparation (S2), E. faecalis was eliminated in all the experimental groups. However, after 7 days (S3), only the groups in which Hypoclean was used, remained contamination-free, including Hypoclean associated with 1% NaOCl, while the root canals irrigated with 1% NaOCl only, presented the highest percentage of bacterial growth. In conclusion, the addition of surfactant increased the antimicrobial activity of 1% NaOCl to levels similar to 5% NaOCl.

O objetivo da presente pesquisa foi avaliar a atividade antimicrobiana de hipoclorito de sódio (NaOCl), associado a um tensoativo. Setenta dentes humanos monorradiculares extraídos foram inoculados com Enterococcus faecalis e incubados durante 21 dias (37 °C). Os grupos foram distribuídos de acordo com a solução irrigadora utilizada no preparo do canal: hipoclorito de sódio a 5%, 2,5% e 1%; Hypoclean(r) a 5%, 2,5% e 1% - uma solução contendo um surfactante (cetrimida) associado com NaOCl. Três amostras microbiológicas foram coletadas de cada dente: S1 - antes de instrumentação; S2 - imediatamente após a instrumentação; e S3 - após um período de sete dias. Os dados foram submetidos à análise de variância e teste de Tukey com 5% de nível de significância. Os resultados mostraram que imediatamente após o preparo do canal radicular (S2), o E. faecalis foi eliminado em todos os grupos experimentais. No entanto, após 7 dias (S3), apenas os grupos em que se utilizou Hypoclean permaneceram livres de contaminação, incluindo Hypoclean 1%, enquanto que os canais radiculares irrigados apenas com hipoclorito de sódio 1% apresentaram a mais elevada percentagem de crescimento bacteriano. Em conclusão, a adição de surfactante aumentou a atividade antimicrobiana de 1% de NaOCl a níveis semelhantes aos do NaOCl 5% .

Comparison of the antimicrobial effect of heavy silicone oil and conventional silicone oil against endophthalmitis-causing agents.

Purpose: To conduct an in vitro experimental study comparing the effectiveness of conventional silicone oil and heavy silicone oil against endophthalmitis‑causing agents. Materials and Methods: The antimicrobial activity of conventional silicone oil (RS OIL 5000) and heavy silicone oil (heavySil 1500) was tested. The antimicrobial effects of both silicone oils were determined by the growing capability of the microorganism. Results: The number of Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, Pseudomonas aeruginosa, and Candida albicans decreased to zero levels at the second day of inoculation in heavy silicone oil. In conventional silicone oil, the microorganisms survived longer than in heavy silicone oil. Conclusion: Heavy silicone oil seems to be more effective than conventional silicone oil against endophthalmitis‑causing agents.

Avaliação in vitro das características antimicrobianas de sugamadex / In vitro evaluation of antimicrobial features of sugammadex / Evaluación in vitro de las características antimicrobianasdel sugammadex

Justificativa e objetivo: os medicamentos administrados por via intravenosa podem ser contaminados durante as várias fases de produção ou preparação. Sugamadex é uma gama-ciclodextrina modificada. Embora muitas pesquisas sobre os efeitos antibacterianos de uma variedade de ciclodextrinas estejam disponíveis, não há estudos dos efeitos antibacterianos de sugamadex. Este estudo investigou a atividade antimicrobiana in vitro de sugamadex. Materiais e métodos: a atividade antimicrobiana in vitro de sugamadex foi investigada pelo método de microdiluição em meio de cultura. O pH da solução de ensaio foi determinado com o uso de um medidor de pH. Os microrganismos-teste analisados incluíram Staphylococcus aureus ATCC 29213, Enterococcus fecalis ATCC 29212, Escherichia coli ATCC 25922 e Pseudomonas aeruginosa ATCC 27853. Na segunda fase do estudo, 100 mg/mL de sugamadex (50 μg) foram contaminados com microrganismos-teste (50 μg), incluindo S. aureus ATCC 29213, E. fecalis ATCC 29212, E. coli ATCC 25922 e P. aeruginosa ATCC 27853, incubados por 24 horas e, em seguida, a produção bacteriana foi avaliada. Resultados: o pH das soluções da análise variaram entre 7,25 e 6,97. Com o uso do método de microdiluição, sugamadex não apresentou efeito antibacteriano contra S. aureus, E. fecalis, E. coli e P. aeruginosa em qualquer concentração. Na segunda fase do estudo, a produção bacteriana foi observada após 24 horas em 100 mg/mL de sugamadex contaminados com os microrganismos-teste S. aureus, E. fecalis, E. coli e P. aeruginosa. .

Background: Drugs administered by intravenous routes may be contaminated during several stages of production or preparation. Sugammadex is a modified gamma cyclodextrin. While research into the antibacterial effects of varieties of cyclodextrin is available, there are no studies focusing on the antibacterial effects of sugammadex. This study investigates the in vitro antimicrobial activity of sugammadex. Materials and methods: The in vitro antimicrobial activity of sugammadex was investigated using the broth microdilution method. The pH of the test solution was determined using a pH meter. The test microorganisms included Staphylococcus aureus ATCC 29213, Enterococcus fecalis ATCC 29212, Escherichia coli ATCC 25922 and Pseudomonas aeruginosa ATCC 27853. In the second phase of the study 100 mg/mL sugammadex (50 μg) was contaminated with test microorganisms (50 μg), including S. aureus ATCC 29213, E. fecalis ATCC 29212, E. coli ATCC 25922 and P. aeruginosa ATCC 27853, left to incubate for 24 h and then the bacterial production in sugammadex was evaluated. Results: The pH of the test solutions ranged between 7.25 and 6.97. Using the microdilution method, sugammadex had no antibacterial effect on S. aureus, E. fecalis, E. coli and P. aeruginosa at any concentration. In the second phase of the study bacterial production was observed after 24 h in 100 mg/mL sugammadex contaminated with the test microorganisms S. aureus, E. fecalis, E. coli and P. aeruginosa. Conclusions: Sugammadex had no antimicrobial effect on the test microorganisms, S. aureus, E. fecalis, E. coli and P. aeruginosa. Care should be taken that sterile conditions are maintained in the preparation of sugammadex; that the same sugammadex preparation not be used for more than one patient; and that storage conditions are adhered to after sugammadex is put into the injector. .

Justificación y objetivo: Los medicamentos administrados por vía intravenosa pueden ser contaminados durante las diversas fases de producción o preparación. El sugammadex es una gamaciclodextrina modificada. Aunque estén disponibles muchas investigaciones sobre los efectos antibacterianos de una variedad de ciclodextrinas, no existen estudios de los efectos antibacterianos del sugammadex. Este estudio investigó la actividad antimicrobiana in vitro del sugammadex. Materiales y métodos: La actividad antimicrobiana in vitro del sugammadex fue investigada por el método de microdilución en medio de cultivo. El pH de la solución de ensayo fue determinado usando un medidor de pH. Los microorganismos testados analizados incluyeron Staphylococcus aureus (S. aureus) (ATCC 29213), Enterococcus faecalis (E. faecalis) (ATCC 29212), Escherichia coli (E. coli) (ATCC 25922) y Pseudomonas aeruginosa (P. aeruginosa) (ATCC 27853). En la segunda fase del estudio, se contaminaron 100 mg/mL de sugammadex (50 µg) con microorganismos testados (50 µg), incluyendo S. aureus (ATCC 29213), E. faecalis (ATCC 29212), E. coli (ATCC 25922) y P. aeruginosa (ATCC 27853), incubados durante 24 h e inmediatamente se calculóla producción bacteriana. Resultados: El pH de las soluciones del análisis varió entre 7,25 y 6,97. Usando el métodode microdilución, el sugammadex no tuvo ningún efecto antibacteriano contra S. aureus, E. faecalis, E. coli y P. aeruginosa en ninguna concentración. En la segunda fase del estudio, la producción bacteriana fue observada después de 24 h en 100 mg/mL de sugammadex contaminados con los microorganismos testados S. aureus, E. faecalis, E. coli y P. aeruginosa. Conclusiones: El sugammadex no presentó ningún efecto antimicrobiano sobre los microorganismos testados S. aureus, E. faecalis, E. coli y P. aeruginosa. ...