Abstract
Green tea's health-promoting properties are primarily attributed to its phytochemical content and antioxidant properties. The study was carried out to evaluate the antioxidant and antibacterial activities of green teas manufactured from three Bangladesh tea (BT) and three Tocklai vegetative (TV) teas. Antioxidant activity was estimated by the determination of DPPH free radical scavenging activity (DRSA), ferric reducing antioxidant power (FRAP), total phenolic content (TPC), and total antioxidant capacity (TAC). BT2 exhibited the maximum DRSA of 89.17%, FRAP of 122.15 mg GAE/g, TPC of 95.75 mg GAE/g and TAC of 46.71 mg GAE/g among all clones. The antimicrobial activities of these teas were analyzed against Gram-positive bacteria Bacillus spp. and Gram-negative bacteria Escherichia coli. The extracts of TV13 and BT2 showed a better zone of inhibition (ZOI) of 14.33 and 16.33 mm against Escherichia coli and Bacillus spp. The methanolic extracts of all samples exhibited potential antioxidant and antibacterial activity. These tea extracts can be used as an alternative to synthetic antioxidants and antimicrobial agents in therapeutics and the food industry.
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