Antioxidant potential and chemical constituents of impatiens bicolor Royle

Abstract

Alcoholic extract of Impatiens bicolor Royle and its various fractions were screened for antioxidant potential by DPPH radical scavenging activity and its chemical constituents were isolated and their chemical structures were determined by mass spectrometry and different NMR spectroscopy techniques. Impatiens bicolor fractions revealed significant antioxidant activity. Dichloromethane fraction of alcoholic extract yielded four compounds whose structures were elucidated as methyl-4-hydroxyl cinnamate (1), stigmasterol (2), stigmasterol 3-O--glucoside (3) and -Sitosterol (4). These results indicated the potential of Impatiens bicolor to be further explored as natural source for new lead compounds