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182 DOI: 10.37398/JSR.2021.650123 Abstract: Oroxylum indicum (L.) Vent. is an important medicinal plant of Bignoniaceae family, whose root bark is authentically used in many Ayurvedic preparations. The increased demand for this plant in the herbal drug market resulted in the substitution of the original plant parts with the parts of two ethno medicinal plantsPajanelia longifolia (Willd.) K. Schum and Radermachera xylocarpa (Roxb.) K. Schum., belonging to the same family. In the present study the total polyphenol content, DPPH free radical scavenging efficiency and total antioxidant activity of the root barks of the above mentioned three plant species were evaluated and compared. The estimation of total phenolic content revealed that Oroxylum indicum has the maximum phenolic content, than the other two species. Also there was a positive correlation between the total phenolic content and radical scavenging activity. It was observed that root bark of Oroxylum idicum has the highest DPPH radical scavenging activity (IC50 value 50), followed by Radermachera xylocarpa (IC50 value 150) and Pajanelia longifolia (IC50 value 253). The total antioxidant activity was also higher for Oroxylum indicum, equivalent to 0.34 mg of ascorbic acid, when compared to the other two species. Methanol found to be the best solvent for extraction.

journal of scientific research of the banaras hindu university

A Comparative Assessment of Total Polyphenols, Antioxidant Activity and Free Radical Scavenging Activity of the Root Barks of Oroxylum indicum (L.) Vent. and Its Two Allied Species