title: Antioxidant activities of various extracts of lotus (Nelumbo nuficera Gaertn) rhizome.
abstract: 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 beta-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 beta-carotene bleaching assay. The properties of the extracting solvents significantly affected the yield, total phenolics content and antioxidant activity of lotus rhizome extracts.
authors: Department of Food Science and Nutrition, Zhejiang University, Hangzhou, China 310029.
authors: Dongmei
authors: D
authors: Yang
authors: Qiushuang
authors: Q
authors: Wang
authors: Leqin
authors: L
authors: Ke
authors: Jianmei
authors: J
authors: Jiang
authors: Tiejin
authors: T
authors: Ying
mesh_terms: D000085:Acetates / Q000737:chemistry; D000096:Acetone / Q000737:chemistry; D000975:Antioxidants / Q000032:analysis*; D001205:Ascorbic Acid / Q000737:chemistry; D001713:Biphenyl Compounds / Q000737:chemistry; D002083:Butylated Hydroxyanisole / Q000737:chemistry; D016166:Free Radical Scavengers / Q000737:chemistry*; D006834:Hydrazines / Q000737:chemistry; D031653:Nelumbo / Q000737:chemistry*; D010851:Picrates; D010936:Plant Extracts; D027343:Rhizome / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D019207:beta Carotene / Q000737:chemistry
chemical_list: D000085:Acetates; D000975:Antioxidants; D001713:Biphenyl Compounds; D016166:Free Radical Scavengers; D006834:Hydrazines; D010851:Picrates; D010936:Plant Extracts; D012997:Solvents; D019207:beta Carotene; D000096:Acetone; D002083:Butylated Hydroxyanisole; C004931:1,1-diphenyl-2-picrylhydrazyl; D001205:Ascorbic Acid