Evaluation of in vitro antimicrobial property of seaweed (Halimeda tuna) from Tuticorin coast, Tamil Nadu, Southeast coast of India

The seaweed (Halimeda tuna) was examined for antibacterial and antifungal activity in vitro using the well diffusion method, minimum inhibitory concentration, minimum bactericidal concentration and minimum fungicidal concentration. The activity was against 10 bacterial strains (Staphylococcus aureus, Salmonella typhimurium, Salmonella paratyphi, Klebsiella oxytoca, Escherichia coli, Proteus mirabillis, Lactobacillus vulgaris, Pseudomonas sp., Klebsiella pneumonia and Vibrio cholerae) and nine fungal strains (Aspergillus niger, Aspergillus flavus, Alternaria alternaria, Candida albicans, Epidermophyton floccossum, Trichophyton mentagrophytes, Trichophyton rubrum, Pencillium sp. and Rhizopus sp.). The methanolic extracts in the present study exhibited a broad spectrum of antimicrobial activity compared to the ethanolic and chloroform extracts. Results of the present study confirm the potential use of seaweed extracts as a source of antimicrobial compound.Keywords: Halimeda tuna, minimum inhibitory concentration, minimum bactericidal concentration, minimum fungicidal concentration, antimicrobial activityAfrican Journal of Biotechnology Vol. 12(3), pp. 284-28

Daya Antibakteri Ekstra Etanol Daun Beluntas (Pluchea indica less) Terhadap Escherichia coli Secara In Vitro

The aim of this study was to investigate the antibacterial activity of the ethanol extract Pluchea indica less leaves against Escherichia coli by in vitro. The method using broth dilution test was determined Minimum Bactericidal Concentration (MBC) with a broth extract cultures into Eosin Methylen Blue Agar (EMBA) medium. The twice tubes of concentration extract of 2546 and 5046 was showed no visible turbidity, and then inoculated into Eosin Methylen Blue Agar medium. After 24 h of incubation at 37 oC, Minimum Bactericidal Concentration (MBC) was determined which no viable growth of Escherichia coli at Eosin Methylen Blue Agar (EMBA) medium. The result showed that Minimum Bactericidal Concentration (MBC) of the extract of 259p and 5040 had been similar (X2x0.05) on the growth of Escherichia coli. Based on this result, Minimum Bactericidal Concentration (MBC) of the extract was used 2546 concentration. Key words : antibacterial, Pluchea indica less, Escherichia col

Effectiveness of Cinnamon (Cinnamomum burmannii) Ethanol Extract Against Staphylococcus aureus Growth

Cinnamon (Cinnamomum burmannii) is widely used by the public as a food ingredient and contains chemical compounds such as alkaloids, flavonoids, polyphenols, saponins, and terpenoids which function as an antibacterial against Staphylococcus aureus. This study aims to determine the Minimum Inhibitory Concentration and Minimum Bactericidal Concentration of cinnamon ethanol extract on Staphyloccocus aureus. This research is experimental with posttest only control group design through the tube dilution method. The results of the Minimum Inhibitory Concentration (MIC) study showed no clarity at concentrations of 30% and 40%. The results of the Minimum Bactericidal Concentration (MBC) obtained the number of colonies at a level of 10% by 51 CFU / plate, 20% by 27 CFU / plate, 30% by 6 CFU / plate and 40% by 0 CFU / plate. Based on the results of this study concluded that MIC cinnamon ethanol extract was 30%, and MBC cinnamon ethanol extract was 40%

Inhibition Strength of Rosella (Hibiscus sabdariffa L.) Boiled Water on Salmonella typhi in vitro

Rosella (Hibiscus sabdariffa L.) is a plant that can use as herbal medicine. Roselle calyx contains active compounds flavonoids, saponins, and tannins. These compounds can use as an antibacterial against Salmonella typhi. This study aims to determine the Minimum Inhibitory Concentration and Minimum Bactericidal Concentration and the effect of rosella cooking water concentration on Salmonella typhi in vitro. Experimental research with posttest only controls group design through dilution method. The results of the Minimum Inhibitory Concentration (MIC) study showed clarity at concentrations of 60%, 70%, 80%, 90%, and 100%. Minimum Bactericidal Concentration (MBC) results obtained the number of colonies at a concentration of 60% by one colony, at a level of 70%, 80%, 90%, and 100% showed no colony growth. Based on the results of the study concluded that there was an influence of rosella cooking water concentration on the growth of Salmonella typhi in vitro

Antibacterial activity of ethyl acetate and aqueous extracts of Mentha longifolia L. and hydroalcoholic extract of Zataria multiflora Boiss. plants against important human pathogens

AbstractObjectiveTo determine the potential antibacterial activity of ethyl acetate and aqueous extracts from Mentha longifolia L. (M. longifolia) and hydroalcoholic extract of Zataria multiflora Boiss. (Z. multiflora) against important human pathogens.MethodsPseudomonas aeruginosa, Shigella dysenteriae, Klebsiella pneumoniae (K. pneumonia), Enterobacter cloacae, Salmonella typhi, Proteus mirabilis, Serratia marcescens, Bacillus cereus, Staphylococcus saprophyticus and Staphylococcus aureus were kinds of pathogenic bacteria to determine the antibacterial effect of aqueous and ethyl acetate extracts of M. longifolia and hydroalcoholic extract of Z. multiflora using broth microdiluation method.ResultsThe lowest minimum inhibitory concentration and minimum bactericidal concentration values for K. pneumonia and Pseudomonas aeruginosa (1.25 and 2.5 mg/mL) were observed by the hydroalcoholic extract of Z. multiflora and the lowest minimum inhibitory concentration and minimum bactericidal concentration values for K. pneumonia and Serratia marcescens (2.5 and 5 mg/mL) were observed by the aqueous extracts of M. longifolia.ConclusionsIn conclusion, it seems that Z. multiflora and M. longifolia extracts could inhibit the growth of all of the mentioned bacteria

Identification of New Drug Candidates Against \u3cem\u3eBorrelia burgdorferi\u3c/em\u3e Using High-Throughput Screening

Lyme disease is the most common zoonotic bacterial disease in North America. It is estimated that .300,000 cases per annum are reported in USA alone. A total of 10%–20% of patients who have been treated with antibiotic therapy report the recrudescence of symptoms, such as muscle and joint pain, psychosocial and cognitive difficulties, and generalized fatigue. This condition is referred to as posttreatment Lyme disease syndrome. While there is no evidence for the presence of viable infectious organisms in individuals with posttreatment Lyme disease syndrome, some researchers found surviving Borrelia burgdorferi population in rodents and primates even after antibiotic treatment. Although such observations need more ratification, there is unmet need for developing the therapeutic agents that focus on removing the persisting bacterial form of B. burgdorferi in rodent and nonhuman primates. For this purpose, high-throughput screening was done using BacTiter-Glo assay for four compound libraries to identify candidates that stop the growth of B. burgdorferi in vitro. The four chemical libraries containing 4,366 compounds (80% Food and Drug Administration [FDA] approved) that were screened are Library of Pharmacologically Active Compounds (LOPAC1280), the National Institutes of Health Clinical Collection, the Microsource Spectrum, and the Biomol FDA. We subsequently identified 150 unique compounds, which inhibited .90% of B. burgdorferi growth at a concentration of ,25 µM. These 150 unique compounds comprise many safe antibiotics, chemical compounds, and also small molecules from plant sources. Of the 150 unique compounds, 101 compounds are FDA approved. We selected the top 20 FDA-approved molecules based on safety and potency and studied their minimum inhibitory concentration and minimum bactericidal concentration. The promising safe FDA-approved candidates that show low minimum inhibitory concentration and minimum bactericidal concentration values can be chosen as lead molecules for further advanced studies

In Vitro Test: Antimicrobial Activity Potential From Ciplukan Fruit (Physalis minima L.) Extract in Methicillin-resistant Staphylococcus aureus (MRSA)

In Indonesia, in 2006 the prevalence of infections due to MRSA was 23.5%. Physalis minima L. plants are known to have antimicrobial activity because they contain compounds withaferin A which can induce programmed cell death. This research was to determine the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of Ciplukan (Physalis minima L.) extract in Methicillin-resistant Staphylococcus aureus (MRSA) bacteria. Dilution test with Mueller-Hinton broth medium used for measuring the minimum inhibitory concentration (MIC). Ciplukan  fruit extract was dissolved in distilled water, and poured into a test tube with a certain concentration (0.9 g/mL (90%); 0.3 g/mL (45%); 0.15 g/mL (22.5%); 0.075 g/mL (11.25%) and 0.0375 g/mL (5.625%). After being incubated for 24 hours, the bacteria in the test tube were plated on nutrient agar plates, to determine the MBC. The MIC cannot be determined, because the solution in the dilution test tube is disturbed by the color of the extract so that turbidity cannot be observed. From the observations of the minimum bactericidal concentration MBC of the Ciplukan (Physalis minima  L.) fruit extract against MRSA was in the P1 tube or equivalent to 0.9 g / ml (90%).Abstract  In Indonesia, in 2006, the prevalence of infections due to MRSA was 23.5%. Physalis minima L. plants are known to have antimicrobial activity because they contain compounds withaferin A, which can induce programmed cell death. This research was to determine the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of Ciplukan (Physalis minima L.) extract in Methicillin-resistant Staphylococcus aureus (MRSA) bacteria. Dilution test with Mueller-Hinton broth medium used for measuring the minimum inhibitory concentration (MIC). Ciplukan  fruit extract was dissolved in distilled water, and poured into a test tube with a certain concentration (0.9 g/mL (90%); 0.3 g/mL (45%); 0.15 g/mL (22.5%); 0.075 g/mL (11.25%) and 0.0375 g/mL (5.625%). After being incubated for 24 hours, the bacteria in the test tube were plated on nutrient agar plates to determine the MBC. The MIC cannot be determined, because the medium in the dilution test tube is disturbed by the color of the extract so that turbidity cannot be observed. From the observations of the minimum bactericidal concentration, MBC of the Ciplukan (Physalis minima  L.) fruit extract against MRSA was in the P1 tube or equivalent to 0.9 g / ml (90%).Keywords             : Physalis minima L., Antimicrobial, Ciplukan, Methicillin-resistant Staphylococcus aureus, Withaferin ACorrespondence   : [email protected]

Synergistic effect of sertraline and disulfiram against multidrug resistant bacteria as a new alternative to drug repositioning

The repositioning of approved drugs is atopic of interest for the academy and the pharmaceutical industry. The synergistic combination of these drugs can be successful in the treatment of infections caused by resistant bacteria. This study aimed to assess the in vitro synergistic antibacterial activity of sertraline and disulfiram and their interaction with ciprofloxacin and sulfamethoxazole/trimethoprim. We determined the minimum inhibitory concentration, the minimum bactericidal concentration and the fractional inhibitory concentration index. Eighteen bacterial strains were used, being nine American Type Culture Collection reference strains and nine multidrug resistant clinical isolates. Synergy was detected between sertraline and disulfiram against a strain of Staphylococcus aureusATCC 25923 and a clinical isolate of S. aureus. When associated to sulfamethoxazole/trimethoprim and ciprofloxacin, sertraline and disulfiram showed eight synergistic events, which occurred against three different standard strains and two multidrug resistant clinical isolates. When the minimum bactericidal concentration was determined, the bactericidal activity of sertraline was enhanced with disulfiram. Our results suggest that these drugs, widely used to treat depression and chronic alcoholism, have antibacterial potential individually, in association, and combined with antimicrobials, what makes their repositioning a promising therapeutic alternative for the effective treatment of infections caused by multidrug resistant bacteria

Novel antibacterial activity of Terfizia claveryi aqueous extract against clinical isolates of corneal ulcer

Terfizia claveryi was examined for in vitro antibacterial activity using the disc diffusion, well diffusion method, minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC). T.claveryi exhibited excellent antibacterial activity against all clinical isolates of corneal ulcer tested, especially against Pseudomonas aeruginosa which showed the maximum antibacterial activity with mean zone of inhibition 20.33 mm at concentration of 100 mg/ml. The MIC for Staphylococcus aureus ranged from 0.040-1.250 mg/ml and MBC for Escherichia coli was 75 μl/ml. In the present study, the MIC value of the active aqueous extract were lower than the MBC values suggesting that, T. claveryi aqueous extracts were bacteriostatic at lower concentration but bactericidal at higher concentration. Also, the bacterial zone of inhibition increased with the increasing concentration of T. claveryi aqueous extract. To the best of our knowledge, this is the first report for the novel antibacterial activity of T.claveryi aqueous extract. This active compound may be used as alternative therapeutic drug for the control of corneal infections. However, further research is needed to examine its in vivo mechanism of action, toxicity, and therapeutic effect.Key words: Bacteria, corneal infection, antimicrobials, minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC), Terfizia claveryi

AKTIVITAS ANTIMIKROBA EKSTRAK ETANOL BIJI PICUNG (Pangium edule Reinw.) HASIL FERMENTASI TERHADAP JENIS BAKTERI PATOGEN PADA MAKANAN

Penelitian ini untuk mengetahui aktivitas antimikroba dalam ekstrak etanol biji picung (Pangium edule Reinw.) terfermentasi serta mengetahui aktivitasnya dalam bentuk serbuk. Penelitian ini dibagi menjadi 3 tahap, yaitu ; Tahap I. Menentukan Aktivitas Antimikroba. Pada tahap ini menggunakan 3 metode yaitu DDA (Disc Diffusion Assay), MIC (Minimum Inhibitory Concentration), dan MBC (Minimum Bactericidal Concentration), Tahap II. Applikasi Ekstrak Etanol Biji Picung (Pangium edule Reinw.) Terfementasi terhadap Bahan Baku Segar, Tahap III. Menguji Aktivitas Antimikroba dalam Bentuk Sajian Serbuk. Pada tahap ini menggunakan metode pengeringan yang kemudian dilakukan pengujian aktivitas senyawa antibakteri dengan menggunakan metode DDA (Disc Diffusion Assay). Hasil dari penelitian diketahui bahwa konsentrasi ekstrak etanol biji picung (Pangium edule Reinw.) terfermentasi terdapat aktivitas senyawa antimikroba pada konsentrasi 10% terhadap bakteri Bacillus cereus, Bacillus megaterium, Bacillus pumilus, Eschericia coli, Staphylococcus aureus, Pseudomonas aeruginosa, Enetrobacter aerogenes, Klebsiella pneumoniae. Dan pada konsentrasi 1% dan 0.1% terhadap Bacillus pumilus. Konsentrasi ekstrak etanol biji picung (Pangium edule Reinw.) terfermentasi terendah untuk menghambat dan membunuh bakteri terjadi pada bakteri Bacillus megaterium dengan konsentrasi sebesar 3.13 mg/mL. Pada penelitian tahap III diketahui tidak terdapat aktivitas senyawa antimikroba pada ekstrak etanol biji picung terfermentasi dalam bentuk sajian serbuk. Kata kunci : Pangium edule Reinw., aktivitas antimikroba, DDA (Disc Diffusion Assay), MIC (Minimum Inhibitory Concentration), dan MBC (Minimum Bactericidal Concentration)