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J Agric Food Chem. 1999 Nov;47(11):4711-3.

Extraction and identification of antioxidants in the roots of yacon (Smallanthus sonchifolius).

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National Food Research Institute, Ministry of Agriculture, Forestry, and Fisheries, 2-1-2 Kannondai, Tsukuba, Ibaraki 305-8642, Japan.


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.

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