Bistorta macrophylla, B.vaccinifolia and Persicaria polystachya are used for the treatment and prevention of many ailments including tuberculosis, inflammation, pyretic, fever, flue, lungs disorders, diarrhea, vomiting, arthritis, gout, kidney stones or hyperacidity and hypertension. This study was aimed to evaluate the possible in vitro antioxidant activity and phytochemical screening of B. macrophylla, B.vaccinifolia and P. polystachya. The results of antioxidant activity study of B. macrophylla showed maximum activity in the methanolic extracts at different concentration of 20, 40, 60, 80 and 100 μg/ml. The percent inhibition of writhing response by the extract was 36.18%, 44.72%, 59.21%. 67.08% and 83.39% respectively. In the present work a potent anti-oxidant activity of methanolic extract of the whole plants of B. macrophylla were demonstrated, validating the ethno pharmacological claims. These experimental findings would further establish the scientific basis of the traditional uses of the plant in the management of different conditions as well as control of different disease.
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