Phytochemical Evaluation of Some Medicinal Plants of Puthan District of Nepal

Different parts of eleven medicinal plants used in the traditional medicine in Puthan district were collected. Three different extracts, methanol, 50% aqueous methanoland 70% aqueous acetone extractswere prepared for each plant material. The methanol extractswere screened for the presence of different classes of phytochemicals. Total phenolic andflavonoid content, as well as DPPH freeradical scavenging activity, were evaluated. All the investigated extracts contain a high amount of phenolics and flavonoids.The highest amount of phenolicsand flavonoids were detected in the methanolextract of bark of Bauhinia variegate(355.35+3.69 mg GAE/g and 209.23 ±1.25 mg QE/g extract). Among the eight tested extracts, the highest radical scavenging activity was shown by methanol extract of bark of B. variegate (IC50 3.68 μg/ml). The extract having the highest phenolic and flavonoid content showed the lowest IC50 demonstrating the positive correlation between radical scavenging activity and total phenolic and flavonoid content.