Antioxidant activities of various extracts of lotus (Nelumbo nuficera Gaertn) rhizome
Lotus rhizome powder was extracted with solvents of different polarities. Antioxidant activities of the extracts were evaluated by a 2, 2-diphenylpicrylhydrazyl (DPPH) assay and a β-carotene bleaching assay, and compared with that of butylated hydroxyanisole (BHA) and ascorbic acid. Methanol showed the highest extract yield among all of solvents. Although acetone extract had the highest total phenolics content, methanol extract had the highest total phenolics recovery from lotus powder (20.1 mg catechin equivalents/100g lotus powder). Extract of either methanol or acetone demonstrated the highest DPPH scavenging activity at both 66.7 mg/L and 133.3 mg/L. All extracts exhibited higher antioxidant activity coefficient (AAC) than that of ascorbic acid, furthermore,dichloromethane and petroleum extracts had comparable AAC with BHA by the β-carotene bleaching assay. The properties of the extracting solvents significantly affected the yield, total phenolics content and antioxidant activity of lotus rhizome extracts.
lotus rhizome extracts total phenolics content antioxidant activity solvent polarity
Dongmei Yang Qiushuang Wang Leqin Ke Jianmei Jiang Tiejin Ying
Department of Food Science and Nutrition, Zhejiang University, Hangzhou, China Department of Food Science and Nutrition, Zhejiang University, Hangzhou, China;Department of Chemist
国际会议
国际营养科学联盟第八届临床营养学大会暨第五届亚太临床营养学会大会
杭州
英文
158-163
2006-10-01（万方平台首次上网日期，不代表论文的发表时间）