Antibacterial Activities of the Methanolic Extract of Bangladeshi Black Tea against Various Human Pathogens

Abstract

The goal of the present study was to evaluate the antibacterial activity of the methanolic extract of
Bangladeshi black tea against various important pathogenic bacteria. Antibacterial activity test was carried out by
agar well-diffusion method. Minimum inhibitory concentration (MIC) and minimum bactericidal concentration
(MBC) were evaluated using microdilution methods. Extract of Bangladeshi black tea demonstrated potential
antibacterial activity in a dose dependent manner against all of the tested bacteria and exhibited highest activity
against two common enteric pathogens, Shigella boydii and Vibrio cholerae with MIC and MBC of 200 μg/ml and 1
mg/ml respectively. Our results indicate that black tea extract can be used as therapeutic to control these deadly
pathogens.