Comparative evaluation of antibacterial efficacy different bioactive smart composites An in vitro study

Background: Composites are the widely used restorative materials, and over the year, newer restorative composites have been introduced to eliminate the drawbacks of previous ones. The recent advance in restorative dentistry is bioactive restorative materials. However, bacterial plaque formation on these restorations is the primary reason for secondary caries. Aims and objectives: The purpose of this study was to do the comparative evaluation of bioactive restorative composites (Beautifil Flow Plus, Activa BioACTIVE, and Filtek Z250 XT as control) for their antibacterial efficacy under in vitro conditions. Materials and Method: Thirty material blocks were used for this evaluation. Antibacterial efficacy was checked against Streptococcus mutans and observed under confocal laser scanning microscopy. Results: The results showed that Activa BioACTIVE shows maximum number of dead bacteria on the material surface compared to other groups. Conclusion: It can be concluded as it has maximum antibacterial efficacy among tested materials.

Antimicrobial Effectiveness of Domestic Lomefloxacin Hydrochloride Eye Drops / 中国药师

Objective:To evaluate the antimicrobial effectiveness of lomefloxacin hydrochloride eye drops from 13 domestic manu-facturers. Methods:The antimicrobial effectiveness of lomefloxacin hydrochloride eye drops was tested based on the antimicrobial ef-fectiveness testing in Chinese Pharmacopoeia(2015 edition,volume 4). Results:The samples from 5 manufacturers could reach level A,those from 3 manufacturers were at level B, and those from 5 manufacturers did not comply with the specification. Conclusion:Some problems exist in the usage of antimicrobial agents in lomefloxacin hydrochloride eye drops from some Chinese manufacturers,and these manufacturers should optimize the type and concentration of antimicrobial agents according to the requirements of Chinese Phar-macopoeia combined with the corresponding prescriptions under the principle of minimum concentration while best effect.

Screening and antibacterial efficacy of selected Indian medicinal plants

Objective: To evaluate the antibacterial efficacy of five Indian medicinal plants such as Acalypha indica L. (A. indica), Aerva lanata (L.) Juss. ex Schult. (A. lanata), Clerodendrum inerme (L.) Gaertn., Pergularia daemia (Forsk.) Chiov. and Solanum surattense Burm. f. against opportunistic bacterial pathogens isolated from HIV infected patients for the potential phytoconstituents in plant extracts. Methods: The opportunistic bacterial pathogens such as Escherichia coli (E. coli), Pseudomonas aeruginosa, Salmonella typhi and Serratia marcescens from Gram-negative group and Staphylococcus aureus from Gram-positive group were isolated from HIV infected patients. The antibacterial efficacy of ethanolic extracts of selected medicinal plants was carried out by disc diffusion method. The potential phytoconstituents of medicinal plant extracts were identified by gas chromatography and mass spectrometry (GC-MS) analysis. Results: Among the five medicinal plants tested, A. indica and A. lanata showed the significant antibacterial activity. A. indica showed potential activity against Staphylococcus aureus and E. coli. A. lanata significantly exhibited antibacterial activity against E. coli, Salmonella typhi and Pseudomonas aeruginosa. A total of 19 phytoconstituents were identified in the ethanolic extract of A. indica and A. lanata by GC-MS analysis respectively. Conclusions: The results of the present investigation revealed that A. indica and A. lanata, possessed significant antibacterial activity when compared with the other plant extracts tested. The presence of 3-O-methyl- d-glucose by GC-MS analysis in both A. indica and A. lanata extracts has not been reported elsewhere in the literature and the findings in this study could be the first one to report.

Freeze-drying of ampicillin solid lipid nanoparticles using mannitol as cryoprotectant

abstract Solid lipid nanoparticles (SLNs) are interesting colloidal drug-delivery systems, since they have all the advantages of the lipid and polymeric nanoparticles. Freeze-drying is a widely used process for improving the stability of SLNs. Cryoprotectants have been used to decrease SLN aggregations during freeze-drying. In this study Ampicillin was chosen to be loaded in a cholesterol carrier with nano size range. To support the stability of SLNs, freeze-drying was done using mannitol. Particle size, drug release profile and antibacterial effects were studied after freeze-drying in comparison with primary SLNs. Preparations with 5% mannitol showed the least particle size enlargement. The average particle size was 150 and 187 nm before and after freeze-drying, respectively. Freeze-drying did not affect the release profile of drug loaded nanopartilces. Also our study showed that lyophilization did not change the antimicrobial effect of ampicillin SLNs. DSC analysis showed probability of chemical interaction between ampicillin and cholesterol.

resumo Nanoparticulas lipídicas sólidas (NLSs) são sistemas coloidais de liberação interessantes, uma vez que reúnem todas as vantagens de nanopartículas lipídicas e poliméricas. A liofilização é um processo amplamente utilizado para melhorar a estabilidade das NLSs e os crioprotetores têm sido usados para diminuir a agregação destas durante esse processo. Neste estudo, a ampicilina foi escolhida para ser encapsulada em um carreador de colesterol de escala nanométrica. Para manter a estabilidade das NLSs, a liofilização foi realizada utilizando-se manitol. O tamanho de partícula, o perfil de liberação do fármaco e os efeitos antibacterianos foram estudados após a liofilização em comparação com a NLSs primária. De acordo com os resultados, as preparações que contêm 5% de manitol mostraram o menor aumento do tamanho de partícula. Os resultados de tamanhos médio foram de 150 e 187 nm antes e depois da liofilização, respectivamente. O perfil de liberação prolongada, bem como o efeito antimicrobiano da ampicilina NLSs não foram alterados após a liofilização. A análise por DSC evidenciou provável interação entre a ampicilina e o colesterol.

Antibacterial Efficiency and DNA Impairmentunveilin Some Bacteria Strains Treated with Conocarpus Erectus L. Extract.

Conocarpus erectus L. (Family Combretaceae) is an introduced plant species, widely spread in Jeddah City, and other parts of Saudi Arabia. Folk medicine has used Parts of this species in its native countries. In the present work four different concentrations of ethanol extracts (50; 100; 150 & 200ppm) from different parts of this plant (seeds, stem, leaves and bark) were assessed against three Gram+ve bacteria (Bacillus subtilius, Micrococcus luteus, Staphylococcus aureus) and three Gram-ve bacteria (Escherichia coli, Pseudomonas aeruginosa & Klebsiella pneumoniae).The effect magnitude of these extracts on tested bacteria strains was as follows: leaves extracts bark stem seeds. Nevertheless results showed a strong activity of all thesedifferent parts against Staphylococcus aureus among the Gram+ve bacteria. The maximum inhibitory effect was observed at 200 μL /dish by all used parts extracts except the bark extract against Pseudomonas aeruginosa, followed by Escherichia coli and Klebsiella pneumoniae among the Gram–Ve bacteria. The Random Amplified Polymorphic DNA (RAPD) assay was used to assess the level of DNA damage in treated bacteria strains. The results confirmed the potentials of Conocarpus erectus as good antibacterial source. Worth noting that the present report, is the first on the antibacterial and molecular characterization of bacteria strains by Conocarpus erectus, growing in the west coast of Saudi Arabia. In conclusion we recommend more innovative investigations, in order to explore the treasures of this therapeutically important plant species.

In-vitro antibacterial screening of extracts of usnea longissima lichen.

Objective: To evaluate the antibacterial activity of the hydroalcoholic and ethanolic extracts of the Usnea longissima lichen. Material and methods: Kirby Bauer's disk diffusion method and broth serial dilution tests according to CLSI Guidelines (2000) were used, to find out the antibacterial effect of the 50% Hydro-ethanolic and 90% ethanolic extracts of the selected lichen. The efficacy of the extracts were measured after the period of incubation as Zone of Inhibition (ZOI) in mm compared with the Standard drug used i.e. Ciprofloxacin for Gram positive and Gentamicin for Gram negative bacterial strains. MIC was further tested for susceptible organisms. DMSO was used as control. All the experiments were conducted in triplicates and in proper sterilized condition Results: It was found that Usnea longissima has a significant activity towards Bacillus cereus (ZOI 25-26 mm as compared to Ciprofloxacin ZOI-23 mm) MIC-0.625 mg/ml, Pseudomonas aeruginosa (ZOI 20-27 mm as compared to Gentamicin ZOI-14 mm) MIC- 1.25 mg/ml and Proteus vulgaris (ZOI of 13 - 16 mm where as Gentamicin produced ZOI as 14 mm) MIC 2.5 mg/ml. Moderate activity was shown towards Staphylococcus aureus, Corynebacterium xerosis, Escherichia coli and Klebseilla pneuomoniae while no activity towards S. epidermidis and S. pyrogenes. Moreover it was seen that 50% Hydro-ethanolic extracts produced more significant ZOI than ethanolic extract in all tested strains. Conclusions: U. longissima contains potent chemical constituents as Usnic acid which can halt infection and is effective against various gram-positive and gram-negative bacterial species. It can be concluded that due to their antimicrobial effects extracts of the lichen can be used for the infectious diseases caused by these microbes. This study provides an in-vitro proof of the antibacterial activity of Usnea longissima.

Antibacterial efficacy of the seed extracts of Melia azedarach against some hospital isolated human pathogenic bacterial strains

<p><b>OBJECTIVE</b>To investigate the antibacterial potential of the polar and non-polar extracts of the seeds of Melia azedarach (M. azedarach) L. (Meliaceae) against eighteen hospital isolated human pathogenic bacterial strains.</p><p><b>METHODS</b>Petrol, benzene, ethyl acetate, methanol, and aqueous extracts at five different concentrations (1, 2, 5, 10 and 15 mg/mL) were evaluated. Disk diffusion method was followed to evaluate the antibacterial efficacy.</p><p><b>RESULTS</b>All extracts of the seeds demonstrated significant antibacterial activity against tested pathogens. Among all extracts, ethyl acetate extract revealed the highest inhibition comparatively. The present study also favored the traditional uses reported earlier.</p><p><b>CONCLUSIONS</b>Results of this study strongly confirm that the seed extracts of M. azedarach could be effective antibiotics, both in controlling gram-positive and gram-negative human pathogenic infections.</p>

Antibacterial efficacy of Bacopa monnieri leaf extracts against pathogenic bacteria.

Background: Bacopa monnieri (Linn) Pennell (Scrophulariaceae) is widely distributed in tropical regions of Asia, and used in the treatment of cough or as an antiseptic. The traditional use of this plant suggests its possible antibacterial properties, but its efficacy has not been examined yet. Objective: Evaluate the antibacterial efficacy against pathogenic bacteria using the disk diffusion method. Materials and methods: Five different concentrations (500 μg, 1, 2, 5, 10, and 15 mg/mL) of crude leaf extracts of Bacopa monnieri (L.) Pennell were tested for antibacterial efficacy against seven Gram-positive and 11 Gramnegative bacteria. The sensitivity of plant fractions was tested using the disk diffusion method. Results: Maximum activity was revealed by ethyl acetate and methanol extracts, followed by aqueous, benzene, and petrol extracts. Phyto-chemical analysis of the plant leaf showed the presence of alkaloids, flavonoids, and saponins. Conclusion: This plant may be effective for treatment of different pathogenic diseases.