Total phenolic content, DPPH free radical scavenging activity and alpha amylae inhibitory potential was determined for three selected medicinal plants-Gymnema sylvestre, Terminalia arjuna and Tinospora cordifolia. The plant extracts were prepared with methanol. The total phenolic content of methonolic extracts of Gymnema sylvestre, Terminalia arjuna and Tinospora cordifolia. were 6.862, 20.862 and 7.987 mg GAE/g plant material respectively. All the three plants showed anti oxidant activities with their IC 50 values were 6.862, 20.862 and 7.987 µg/ml compared to IC 50 value of the standard L-Ascorbic acid, which was 11.59µg/ml. The extracts of Gymnema sylvestre showed ±-amylase inhibition. Thus the results provided evidence that among the studied plants, Gymnema sylvestre potential sources of natural antioxidant and antidiabetic activity.
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