title: Extraction and identification of antioxidants in the roots of yacon (Smallanthus sonchifolius).
abstract: Yacon, Smallanthus sonchifolius (Poepp. & Endl.) H. Robinson, Asteraceae, an important economic species grown for its juicy tuberous root, is potentially beneficial in the diet to diabetics. The antioxidative activity of yacon root was studied by 1, 1-diphenyl-2-picrylhydrazyl (DPPH) assay. Antioxidants were extracted by methanol and isolated and purified by gel permeation chromatography and preparative reverse-phase HPLC. Two of the major antioxidants were identified as chlorogenic acid and tryptophan by NMR and mass spectrometry.
authors.affiliation: National Food Research Institute, Ministry of Agriculture, Forestry, and Fisheries, 2-1-2 Kannondai, Tsukuba, Ibaraki 305-8642, Japan.
authors.forename: X
authors.initials: X
authors.lastname: Yan
authors.forename: M
authors.initials: M
authors.lastname: Suzuki
authors.forename: M
authors.initials: M
authors.lastname: Ohnishi-Kameyama
authors.forename: Y
authors.initials: Y
authors.lastname: Sada
authors.forename: T
authors.initials: T
authors.lastname: Nakanishi
authors.forename: T
authors.initials: T
authors.lastname: Nagata
mesh_terms: D000975:Antioxidants / Q000302:isolation & purification* / Q000378:metabolism; D019659:Asteraceae / Q000737:chemistry*; D002726:Chlorogenic Acid / Q000378:metabolism; D009682:Magnetic Resonance Spectroscopy; D010936:Plant Extracts / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D014364:Tryptophan / Q000378:metabolism
chemical_list: D000975:Antioxidants; D010936:Plant Extracts; D002726:Chlorogenic Acid; D014364:Tryptophan