The in vitro antioxidant capacities of Polianthes tuberosa L. flower extracts

摘要

This study was designed to examine the chemical compositions of scent volatiles and antioxidant activities of Polianthes tuberosa L. flower extract in six different solvents. The main constituents of the volatile components were benzyl benzoate, methyl 2-amino benzoate, methyl isoeugenol, isoeugenol, benzyl salicylate, methyl salicylate, geraniol and 1,8-cineole. Total phenolic content of floral extracts in water, methanol, ethanol, ethyl acetate, hexane and dichloromethane were found to be 0.094, 0.18, 0.14, 0.007, 0.004 and 0.110 mg gallic acid equivalent/mg fresh weight, respectively. The methanol soluble fraction showed highest values of antioxidant activity through DPPH and ABTS assays. Methanol extract effectively inhibits the non site-specific DNA strand breakage caused by Fenton's reagents. Dichloromethane and aqueous fractions also exhibited high antioxidant capacities. Aqueous extract showed highest value in FRAP assay.