Antibacterial activities of the Methanolic extract of Bangladeshi Black tea against various human pathogens

Abstract

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.

Tea regimen, a comprehensive assessment of antioxidant and antitumor activities of tea extract produced by Tie Guanyin hybridization

“…The active components playing key roles in most of the biological activities in tea are considered as catechins (also known as polyphenols). 11,12 Moreover, tea polyphenols are well-known for possessing antioxidant capability. Both green tea and black tea are capable of working as potential antioxidants thanks to the presence of catechins and their ramications in different forms.…”

Comparative Analysis of Antibacterial Activity of Aqueous, Ethanolic, Methanolic and Acetone Extracts of Commercial Green Tea and Black Tea against Standard Bacterial Strains

“…The variation in polyphenolic composition of different tea products is due to this difference in processing. During Black tea processing the auto-oxidation of tea leaves convert catechins to more complex Theaflavins(TFs) and Thearubigins(TRs) (Koech et al, 2013;Hamilton Miller et al, 1995;Hossain et al,2014).…”

In vitro antifungal activity against Candida species of Sri Lankan orthodox black tea (Camellia sinensis L.) belonging to different agro-climatic elevations

“…The in vitro technique used to ascertain the antifungal activity was a widely employed inexpensive and well-established method [7,8]. Methanolic extracts were employed since they were the most common solvent used in investigation of plant products for anti-fungal activity [9,10]. The tea samples used were typical and representative to each grade and agro-climatic elevation in the country (in terms of sieve analysis, organoleptic properties and external appearance) [11,12], unblended and garden fresh.…”