Abstract
SCREENING OF ANTIBACTERIAL ACTIVITIES OF COMMERCIALLY AVAILABLE TEA EXTRACTS

Soumen Banerjee and Sovan Bagchi*

ABSTRACT

Aqueous extracts of Camellia sinensis (C. sinensis) leaves show the presence of phytochemicals like alkaloids, glycosides, saponins, aminoacids, sterols, triterpenoids, phenolic compounds and tanins. Theaqueous leaves extracts of Camellia sinensis shows antibacterial efficacy against some pathogenic bacteria. The antibacterial effect of tea against S. aureus proved very effective. Antibiotic sensitivity was done for all bacterial isolates of S. aureus. The present study was conducted to evaluate the role of tea extracts on different microorganisms such as Salmonella typhimurium, Staphylococcus aureus, Pseudomonas aerogenosa and Escherichia coli. Different commercially available teas have been chosen like Black tea, Darjeeling Tea, Green Tea. The antibacterial activity of these different plant leaves extracts give an idea that which leaves extracts are effective against above mentioned bacteria. After the preliminary screening for antibacterial activity by well diffusion method, the MIC & MBC also determined against above mentioned bacteria. All the tea extracts like Black tea, Darjeeling Tea, Green Tea showed inhibitory actions against all the bacteria under study except E.Coli. Varying degree of inhibitory actions of tea are found against individual bacteria.

Keywords: Tea, Camellia sinensis, Antibiotic sensitivity, MIC & MBC.


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