ABSTRACT
Increased resistance to a large number of antibacterial drugs poses a serious challenge in chemotheraphy of infectious diseases. Here, we have made and attempt to redesign the existing chemotherapeutic agent enrofloxacin (EN) to treat resistant bacteria. Precisely, we synthezied EN conjugated zinc oxide nanoparticles (EN-ZNP) and explored enhancing the antibacterial activity of enrofloxacin. Zinc oxide nanoparticles (ZNP) were synthesized by microwave irradiation and amine functionalization by co-condensation with APTES and then by utilizing EPC/NHS chemistry, enrofoxacin was conjugated. Conjugation and their stability were confirmed by FT-IR spectra and Zeta potential. EN fraction in EN-ZNP was determined indirectly using UV-Vis spectroscopy. The MIC values obtained for EN-ZNP against MTCC cultures and clinical isolates of Escherichia coli, Salmonella typhimurium, Staphylococcus aureus were significantly (P <0.05) lower than ZNP and, when compared to native EN it is significantly higher. However, the concentration of conjugated EN in EN-ZNP was significantly lower than the MIC of native EN. The results suggest that enrofloxacin can be successfully conjugated with amine functionalized zinc oxide nanoparticles. The antibacterial efficacy was significantly improved when ZNP conjugated with EN against standard MTCC cultures and clinical isolates.
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One of the most important objectives of root canal treatment is elimination of microorganisms in the root canals. The use of intra-canal medicament may be helpful in eliminating remaining bacteria that survived inside the root canals after complete chemo-mechanical preparation. This study aims to evaluate and compare the antimicrobial activity of Septilin, chlorhexidine and calcium hydroxide against Enterococcus faecalis and Streptococcus mutans. Intra-canal medicament helps in eliminating remaining bacteria that survived inside root canals after complete chemo-mechanical preparation. MethodsThe well variant of agar diffusion test using brain heart infusion agar was used for evaluating the antimicrobial activity of the intra-canal medicaments. McFarland 0.5 turbidity standard was taken as reference to adjust the turbidity of bacterial suspensions. The wells were prepared and filled with of Septilin, chlorhexidine and calcium hydroxide. This was done for both the test organisms and plates were incubated in an incubator for 24 hrs. at 37 °C. After incubation, antimicrobial effectiveness was determined using digital caliper (mm) by measuring zone of inhibition. ResultsThe mean zone of inhibition for chlorhexidine, calcium hydroxide, and Septilin were 29.50 ± 0.58, 25.00 ± 0.00, 20.00 ± 0.82 for E. faecalis and 28.50 ± 1.00, 24.25 ± 0.96, 19.50 ± 1.29 for S. mutans respectively. ConclusionsSeptilin showed significant inhibition against E. faecalis and S. mutans but its antibacterial activity is less compared to that of calcium hydroxide and chlorhexidine. Moreover, the dark colour of the material might cause tooth discoloration.
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Microorganisms are the common aetiological factors in initiation as well as perpetuation of periapical and pulpal diseases. Microbial leakage is a cardinal aetiology behind endodontic treatment failure. The success of root canal treatment is greatly influenced by antimicrobial potential of the dental material used in endodontic procedures which plays an important role in creating a hermetic seal to prevent egress of bacteria into root canal from periapical region. METHODSThe three cements MTA, Biodentine and EndoSequence were made into pellets to test their antimicrobial action on the growth of Enterococcus faecalis (ATCC 29212); method used was agar diffusion test. RESULTSAt 24-hour study interval, EndoSequence showed the greatest zone of inhibition of 10.6 mm against Enterococcus faecalis (ATCC 29212) compared to Biodentine with zone of inhibition of 5.5 mm and MTA with the zone of inhibition of 5 mm. EndoSequence showed highest antimicrobial efficacy at 36-hours and 72-hours study intervals by mean inhibition zone of 11 mm against Enterococcus faecalis compared to that of Biodentine (6 mm) and MTA (5.6 mm) respectively with a p value of less than 0.05 which is highly significant. The antimicrobial activity of EndoSequence was very strong compared to Biodentine and MTA against Enterococcus faecalis (ATCC 29212). CONCLUSIONSMicroorganisms play pivotal role in the initiation as well as perpetuation of periapical and pulpal diseases. Microbial leakage is a cardinal aetiology behind endodontic treatment failure. The success of the root canal treatment is greatly influenced by antimicrobial potential of the dental material used in endodontic procedures which plays an important role in creating a hermetic seal to prevent egress of bacteria into root canal from periapical region.
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Background: The rise in disease incidence, increased resistance of pathogenic bacteria to currently used antibiotics and chemotherapeutics, opportunistic infections in immunocompromised individuals, and financial considerations in developing countries necessitates alternate preventive and treatment strategies for oral diseases. Objective: The objective of the study is to assess the antimicrobial efficacy of triple and quadruple combinations of Acacia nilotica (AN), Murraya koenigii (Linn.) (MKL) Sprengel, Eucalyptus (Euca), and Psidium guajava (PS) on primary plaque colonizers. Materials and Methods: The phytochemicals in four plants were extracted using Soxhlet apparatus. The dried extracts were diluted with dimethyl sulfoxide (DMSO) to prepare stock solutions (100 mg/ml) of each plant. The triple and quadruple combinations were prepared after mixing equal quantities of stock solutions from each plant extracts. The antimicrobial efficacy testing was done on Streptococcus mutans, Streptococcus sanguis, and Streptococcus salivarius using agar well diffusion method. Chlorhexidine of 0.2% composition and DMSO were used as positive and negative controls, respectively. The mean diameter of inhibition zone between different categories was compared using one‑way analysis of variance. Results: The combination of AN + MKL Sprengel + Euca + PS produced the highest mean diameter of inhibition zone (23.5 ± 2.17 mm) against S. mutans. The combination of AN + MKL Sprengel + Euca produced the maximum antimicrobial efficacy against S. sanguis (19.83 ± 1.33). Conclusion: All the triple and quadruple combinations of the plant extracts offered antimicrobial benefits either superior or comparable to 0.2% chlorhexidine against S. mutans, S. sanguis, and S. salivarius.
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Aims: The aim of the present study was to determine the effects of essential oil of wild Artemisia herba-alba grown in south Jordan on biofilm-forming bacteria. Study Design: Seven bacterial clinical isolates were used in this study. Biofilm formation was first quantified in microtitre plates. The minimum inhibitory concentration (MIC) and biofilm inhibitory concentration (BIC) assays were performed in microtitre plates using a two fold dilution series. The most tolerant isolate were then used to test the effectiveness of Artemisia herba-alba essential oil on initial adherence to polystyrene surface. Place and Duration of Study: Faculty of Medicine, Mutah University, Mutah, Jordan; Faculty of Science, Department of Chemistry Yarmouk University, Irbid, Jordan; and Faculty of Science, Department of Chemistry, Albalqa' Applied university, Albalqa, Al-Salt, Jordan. Between August 2012 and June 2014. Methodology: Using a microtitre plate assay we measured inhibitory adherence effect for Artemisia herba-alba essential oil against seven biofilm-forming bacterial clinical isolates. Results: Artemisia herba-alba essential oil produced inhibitory effects against all isolates and susceptibility varied considerably. The MIC values were found to be in the range of 0.5-4% v/v. In addition Artemisia herba-alba essential oil was able to inhibit initial adherence in the most tolerant isolate (Pseudomonas aeruginosa) at sub-inhibitory concentrations. Conclusions: Artemisia herba-alba essential oil showed a significant activity against all isolates. It was able to inhibit initial adherence in the most tolerant isolate at sub-inhibitory concentrations.
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Objective To observe the differences in the therapeutic efficacies of macrolides,minocycline,and tosufloxacin against macrolide-resistant Mycoplasma pneumoniae(MRMP).Methods A total of 188 children with M.pneumoniae pneumonia confirmed by culture and PCR were analyzed.Of these,150 patients had a strain with an MR gene and 134 had one with an A-to-G mutation at position 2063 of M.pneumoniae 23S rRNA domain V.Azithromycin(n=27),clarithromycin(n=23),tosufloxacin(n=62),or minocycline(n=38)was used for definitive treatment of patients with MR M.pneumoniae.Among the 188 patients,the other 38 patients with macrolide-sensitive Mycoplasma pneumonia (MSMP)were grouped into azithromycin(n =16)and clarithromycin groups(n =22)for observing whether there is differences with respect to efficacy under parallel treatment between patients with MRMP and MSMP. Results Defervescence within 48 h after the initiation of antibiotic therapy was observed in 41%of the patients in the azithromycin group,48% of those in the clarithromycin group,69% of those in the tosufloxacin group,and 87% of those in the minocycline group.The average number of days of fever after the administration of antibiotic treatment was lower in the minocycline and tosufloxacin groups than in the macrolide groups(azithromycin and clarithromycin groups).The decrease in the M.pneumoniae burden,as estimated by the number of DNA copies,after 48 to 96 h of treatment was more rapid in patients receiving minocycline(P=0.016)than in those receiving tosufloxacin(P=0.049),azithromycin(P=0.273),or clarithromycin(P=0.107).Conclusion We found that the clinical and bacteriological efficacies of macrolides against MR M.pneumoniae pneumonia was low.Our results indicated that minocycline rather than tosufloxacin can be considered the first-choice drug for the treatment of M.pneumoniae pneumonia in children aged >8 years.
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The Zingiberaceae is one of the largest families from the order Zingiberales, with approximately 50 genera and over 1,000 species. The family has noted antimicrobial effect. In this study the efficacy of essential oils extracted from three species of Zingiberaceae under genus Curcuma and Zingiber is tested on certain pathogenic bacteria and fungi. The oil samples did not show any bactericidal activity. They were active only under bacteriostatic condition. Antifungal assay was carried out for the Curcuma amada Roxb, Zingiber officinale Rosc. var. moran, Z. officinale Rosc., Z. zerumbet (L.) J. E. Smith, out of which Z. offiicinale var. moran showed greater inhibitory effect over the microbial strains.
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Background and objectives: To evaluate the in vitro antimicrobial activity of different root canal sealers. Materials and method: Five root canal sealers were selected for the study namely Zinc Oxide Eugenol, Endoflas FS, Endomethasone, AH plus and Sealapex . Enterococcus faecalis was obtained from American Type Culture Collection (ATCC 29212).The media used were Brain Heart Infusion Broth (BHI) and Blood Agar. 10 blood agar plates of 15 x 100 mm were prepared each inoculated with prepared E. faecalis to obtain Lawn culture. Ampicillin discs (10g) were used as the control discs. The sealers were manipulated under the UV laminar flow chamber. 100 microlitre (0.1 ml) of each sealer was placed on the sterile paper disc with micropipettes. The zones of inhibition were measured at 24 hours and 48 hours from the edge of the paper discs with help of vernier calipers and recorded. Results : Kruskal-wallis one way ANOVA was used to calculate the overall P-value. Mann – Whitney U-test was employed to identify the significant groups at 5% level after correcting the p-values for multiple comparisons by Bonferroni correction method. Conclusion: Endomethasone showed significantly greater antimicrobial effect against E. faecalis. There was no significant difference of antimicrobial activity between Zinc Oxide Eugenol and Endoflas FS on E. faecalis. Sealapex was less effective against E .feacalis. AH plus showed no antimicrobial activity on E. faecalis.
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Talinum cuneifolium (Vahl.) Willd. an erect shrub with subterranian tuber (Portulacaceae) is endowed with wide range of pharmacological activities. The antimicrobial efficacy of the plant is evaluated against three bacteria and two fungal species by disc diffusion method. Preliminary phytochemical screening was carried out among hexane, ethylacetate, methanolic extracts of leaf and root tuber for different potent chemicals. The leaf methanolic extract of T. cuneifolium showed maximum effect on the growth of Proteus (25.8 mm) followed by Bacillus (24.62 mm) and E. coli (19.42 mm). The tuberous methanolic extract of T. cuneifolium showed maximum effect on growth of Proteus (28.15 mm) followed by Bacillus (26.88 mm) and E. coli (24.51 mm). The Gram-positive bacterial strains (Bacillus) were more susceptible to the extractions of T. cuneifolium as compared to Gram-negative bacteria (E.coli, Pseudomonas aeruginosa, Proteus vulgaris and Klebsiella pneumoneia). The antifungal activity of selected plant leaf and root tubers exhibit pronounced activity against Candida albicans rather than Aspergillus niger. These studies showed that the methanolic extracts of T. cuneifolium plant parts were certainly much better and powerful. This may be due to the better solubility of the action components in organic solvent.
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Background and Objectives: In endodontics, various intracanal medications have been advocated to eliminate bacteria after root canal instrumentation. A recent study has revealed that addition of powdered dentin to bioactive glass (BAG) led to increased glass dissolution, and an increased antibacterial efficacy. Therefore, the present study was undertaken to compare the effect of enamel and dentin powder on the antibacterial efficacy of a commercially available BAG. Materials and Methods: Dentin blocks (dbs) were prepared from single rooted human teeth. These dbs were infected with Enterococcus faecalis for two weeks in Tryptic Soy Broth (TSB), while negative controls were kept in sterile TSB. In group I, the infected dbs were filled with BAG, in group II with BAG + Enamel powder and group III with BAG + Dentin powder. Dentin samples were harvested from the dbs and cultured. Statistical Analysis: Kruskal-Wallis ANOVA was used for multiple group comparison followed by Scheffe's post hoc test for pair-wise comparisons. Results: All the combinations of BAG evaluated significantly reduced the bacterial counts compared to the control group. However, at the end of 24 hours, three days, and five days BAG + Dentin powder showed significant reduction ( P < 0.01) in bacterial counts compared to the other experimental groups. Conclusion: Among the various materials evaluated, it appeared that though BAG exhibits antimicrobial efficacy, the addition of powdered enamel and dentin in aqueous suspension definitely enhanced this property. However, the addition of enamel powder BAG did not significantly alter its antimicrobial efficacy compared to BAG + dentin powder.
Subject(s)
Analysis of Variance , Anti-Infective Agents, Local/pharmacology , Biocompatible Materials/pharmacology , Ceramics/pharmacology , Dental Enamel , Dentin/microbiology , Enterococcus faecalis/drug effects , Humans , Hydrogen-Ion Concentration , Powders/pharmacology , Root Canal Irrigants/pharmacology , Statistics, NonparametricABSTRACT
The purpose of this paper is to discuss critically the antibacterial efficacy of intracanal medicaments on bacterial biofilm. Longitudinal studies were evaluated by a systematic review of English-language articles retrieved from electronic biomedical journal databases (MEDLINE, EMBASE, CENTRAL) and handsearching records, using different matches of keywords for root canal biofilm, between 1966 and August 1st, 2007. The selected articles were identified from titles, abstracts and full-text articles by two independent reviewers, considering the tabulated inclusion and exclusion criteria. Disagreements were resolved by consensus. The search retrieved 91 related articles, of which 8.8 percent referred to in vivo studies demonstrating the lack of efficacy of endodontic therapy on bacterial biofilm. Intracanal medicaments were found to have a limited action against bacterial biofilm.
Subject(s)
Humans , Biofilms/drug effects , Root Canal Irrigants/pharmacology , Dental Pulp Cavity/microbiologyABSTRACT
Indiscutivelmente, higiene de mãos (HM)é uma das medidas mais importantes para prevenir as Infecções Hospitalares. Além da tradicional lavagem com água e sabão, o uso do álcool tem se destacado na HM, pois, possui boa atividade antimicrobiana, dispensa pia, reduz o tempo e previne ressecamento de mãos. Das evidências científicas sobre seu uso na HM, ainda há contradições quanto à sua efetividade na presença da matéria orgânica nas mãos. Esta pesquisa foi desenvolvida com intuito de elucidar esta questão avaliando a eficácia antimicrobiana de três formulações alcoólicas (duas em forma de gel e uma líquida) nas mãos com matéria orgânica. Os trabalhos laboratoriais foram realizados no Laboratório de Pesquisas do Instituto de Ensino e Pesquisas (coleta de amostras bacterianas) e no Laboratório de Microbiologia do Departamento de Patologia Clínica do Hospital Albert Einstein (contagem bacteriana), utilizando a metodologia oficial Européia - EN 1500 modificada. Quatorze voluntários - pessoas saudáveis, sem problemas de pele nas mãos e que assinaram o "Termo de Consentimento Livre e Esclarecido", foram aleatorizados em três grupos e cada grupo utilizou os produtos-testes e referência em sequências diferentes. Os produtos-teste foram: produto A - álcool etílico sob a forma de gel a 62% (p/p), produto B - álcool etílico sob a forma de gel a 70%(p/p) e produto C - álcool etílico a 70% (p/v) glicerinado sob a forma líquida e o produto D - álcool 2-propanolol ---------------------|a 60%, produto referência padronizado pela metodologia EN 1500. Para cada produto-teste e referência, foi realizada a seguinte sequência de procedimentos: lavagem de mãos por um minuto com água e sabão; aplicação de 1,2 ml de sangue estéril desfibrinado de carneiro; contaminação das mãos até metade dos matacarpos no caldo tríptico de soja (TSB) com o microrganismo-desafio S. macescens ATCC 14756; coleta de amostras pré HM, friccionando os dedos na placa de Petri contendo TSB (valor inicial); HM aplicando o(s) produto(s)-teste e referência; coleta de amostras para recuperação bacteriana (valor final), com a mesma técnica da fase pré HM e cálculo do fator de redução (FR) logarítmica (log10) de S. marcescens (valor inicial - valor final). Foram realizadas análises estatísticas (teste de Wilcoxon) para verificar a equivalência entre o(s) produto(s)-teste e referência, com o nível de significância estabelecido em P=0,10, unicaudal. Os FR (log10) foram: 3,29 para o produto A; 3,36 para o produto B e 3,56 para o produto C. O produto-referência, produto, produto D, promoveu FR log10 de 3,66. Os testes de Wilcoxon indicaram que há equivalência dos produtos B (P=0,198) e C (P=0,826) com o produto referência D, e que existe diferença do produto A (P=0,074) quando comparado ao produto D. Como conclusão, este estudo revelou que os produtos-teste, utilizados em mãos artificialmente sujas com matéria orgânica reduziram significativamente a colonização transitória das mãos - mais de 3 log10, redução acima de 99,9% podendo ser utilizados para HM. Estes valores são superiores aos valores de FR log10 encontrados após a lavagem de mãos com sabão não-antimicrobiano(2,7) e sabão antimicrobiano tricosan (2,8) e semelhantes aos valores de PVP-I (3,5) e clorexidina degermante (3,1). O produto A, apesar de reprovado pela metodologia oficial EN 1500, obteve o menor FR log10 (3,26), é superior aos sabões não-antimicrobianos e com triclosan e clorexidina degermante a 4%, o que indica a possibilidade de sua utilização como segunda opção.
Hand hygiene is considered the most important measure to reduce the transmission of nosocomial pathogens in health care settings. Because alcohol has excellent antimicrobial activity, requires less time, results in less skin irritation and does not require proximity to a sink, is the preferred agent for hand hygiene. In the face of scientific evidence, there's still contradiction concerning the effectiveness of alcohol in the hands with proteinaceous material. This research was developed in order to compare the antimicrobial activity of three alcoholic products commonly used (two alcohol-based gel and one liquid formulation) in the hands with organic material. It was conducted in the Research Laboratory (bacterial samples) and in the Microbiology Laboratory of the Clinical Pathology Department (bacterial counting) of the Hospital Albert Einstein, using modified European Standard EN 1500. The test products were: A - ethanol alcohol-based gel 62% (p/p), product B - ethanol alcohol-based gel 70% (p/p) and product C - ethanol alcohol-based liquid 70% (p/v) with glycerol 2% compared to reference product: D - alcohol 2-propanolol 60% (v/v) on artificially contaminated hands with S. marcescens ATCC 14756, using a cross-over design. Fourteen healthy volunteers, with no skin hand problems and who signed written consent form were randomized in 3 groups. For each reference and test products, the following sequence was carried through: hands were washed with soft soap, 1,2 ml of sterile sheep blood defibrinated was dispensed by sterile syringe into the hands, air-dried and immersed in the contamination fluid up to the mid-metacarpals. Bacterial sample were recovered for the inicial count by rubbing the fingertips of each hand for 1 min in the petri dish containing tryptone soya broth (TSB) . The hands were rubbed thoroughly over their entire surface (30 to 60 seconds) with 2 -3 ml of the test products. The reference product was used twice (total of 6 ml) and rubbed for 60 seconds. Both hands were rinsed in running water and excess water was drained off. Final bacterial count was obtained rubbing the fingertips of each hand for 1 min in the petri dish containing TSB. For both reference and test products, the mean log10 reduction factors (RF) were calculated (difference between the pre-value and post-value) and for testing the RF of the test products against that of reference product the Wilcoxon teste was used (level of significance was set at P=0,1, one sided) The RF log10 calculated were: 3,29 for the product A; 3,36 for the product B; 3,56 for the product C and 3,66 for the product D. The Wilcoxon test indicated that product A did not meet standard criteria (P = 0,074) and the products B (P = 0,198) and C (P = 0,826) met the EN 1500 requirement. As conclusion, this study indicated that the test products, used in hands with organic material, significantly reduced the transient flora, more than 3 log10 (99,9% of reduction), may be used for hand hygiene. These values are greater than the values of RF log10 after washing hands with plain soap (2,70) and triclosan (2,8) or similar or even exceeding when comparing with antimicrobial detergents used for hand washing, as PVP-I (3,5) or chlorhexidine 4% (3,1). Although the product A did not meet the EN 1500 criteria and had the lowest RF log10, its RF is superior to soaps (plain soap, triclosan and chlorhexidine 4%). This indicates a possibility of its usage as a second option.