Synergistic effect of herbal plant extract () in maintain the antioxidant activity of decaffeinated green tea from various parts of Assam.

In the present study, two extraction methods, hot water extraction and ethyl acetate extraction were used to decaffeinate fresh green tea leaf () collected from four parts of Assam, NE-India. Both type of extraction methods have significant effect on the antioxidant activity of decaffeinated green tea. Amongst the four samples, Dhekiajuli sample have highest antioxidant activity and total polyphenol as well as flavonoid contents.