Biological Activities of Magnolia denudata Desr. Flower Extracts

Abstract

The antioxidant, antiproliferation, and nitrate synthesis inhibitory effects of Magnolia denudata extracts (ME) were evaluated. The ME was extracted with 70% (v/v) ethanol and fractionated with solvents of hexane, chloroform, ethyl acetate, n-buthanol and aqueous. The ethyl acetate fraction contained the highest phenolic and flavonoid contents of 427.10 ㎎ garlic acid eq/g and 356.05 ㎎ catechin eq/g, respectively. The ethyl acetate fraction showed strong 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity with a 50% inhibition concentration (IC??) of 0.20 ㎎/mL and total antioxidant activity was 0.90 ㎎ AA eq/100 ㎎. From the results of cytotoxic effects of HCT116, NCL-H460, and HepG2 human cancer cells by MTT assay on the ME and its solvent fraction, chloroform fraction showed the highest cytotoxic effect (IC?? value: 0.14, 0.37, and 0.41 ㎎/mL, respectively). Nitrate synthesis inhibitory effect of ME and its solvent fractions on nitric oxide synthase activity in LPS stimulated RAW 264.7 cells were decreased in dose-dependent manners, and IC?? value of hexane and chloroform fractions were 0.39 and 0.49 ㎎/mL, respectively.