Antibacterial activities of green tea crude extracts and synergistic effects of epigallocatechingallate (EGCG) with gentamicin against MDR pathogens.

Autor:	Parvez MAK; Department of Microbiology, Jahangirnagar University, Savar, Dhaka, Bangladesh.; Treasurer, Pabna University of Science and Technology, Pabna, Bangladesh., Saha K; Department of Microbiology, Jahangirnagar University, Savar, Dhaka, Bangladesh., Rahman J; Department of Microbiology, Jahangirnagar University, Savar, Dhaka, Bangladesh., Munmun RA; Department of Microbiology, Jahangirnagar University, Savar, Dhaka, Bangladesh., Rahman MA; Department of Microbiology, Jahangirnagar University, Savar, Dhaka, Bangladesh., Dey SK; Department of Microbiology, Jahangirnagar University, Savar, Dhaka, Bangladesh., Rahman MS; Department of Genetic Engineering and Biotechnology, Jashore University of Science and Technology, Jashore, Bangladesh., Islam S; Department of Biochemistry and Microbiology, North South University, Dhaka, Bangladesh., Shariare MH; Department of Pharmaceutical Sciences, North South University, Dhaka, Bangladesh.
Jazyk:	angličtina
Zdroj:	Heliyon [Heliyon] 2019 Jul 22; Vol. 5 (7), pp. e02126. Date of Electronic Publication: 2019 Jul 22 (Print Publication: 2019).
DOI:	10.1016/j.heliyon.2019.e02126
Abstrakt:	Plant extracts and their purified compounds were examined for synergistic antimicrobial activity using selected multi-drug resistant (MDR) pathogens. The study aims to investigate the antibacterial activity of green tea ( Camellia sinensis ) and its purified compound epigallocatechingallate (EGCG). The synergistic relation of the compound with antibiotic was detected against selected potential Gram positive and Gram negative pathogens. Staphylococcus aureus and Escherichia coli were used as test pathogens which were resistant to different groups of antibiotics. After collection of fresh green tea leaves, samples were washed and air dried. EGCG is one of the bioactive compounds and was separated from tea plant. Antibacterial activity of EGCG and crude extracts of green tea were done by microdilution method (minimum inhibitory concentration and minimum bactericidal concentration). The synergistic effect of EGCG and gentamicin was determined. MIC value of green tea extract was found at 125 μg/mL in case of MDR E. coli , MDR S. aureus and their reference strains and MBC at 500 μg/mL against S. aureus . No MBC value was found against E. coli . EGCG showed better activity on Gram positive pathogen compared to that of Gram negative. MBC value of this compound was 1250 μg/mL for E. coli where 625 μg/mL for S. aureus . Strong synergistic relation (FICI 0.325) was found against pathogens in the combination of EGCG with gentamycin. The purified EGCG compound of green tea has great synergistic effect against MDR pathogens. More investigation is needed to know the inhibitory effect of these plant extracts and their components.
Databáze:	MEDLINE
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