Radical scavenging compounds in onion skin

H. J. Suh, J. M. Lee, J. S. Cho, Y. S. Kim, S. H. Chung

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76 Citations (Scopus)


Two major flavonols (F(I) and F(II)) in onion skin were isolated. According to the ultraviolet-visible absorption spectra, F(I) and F(II) fractions were thought to be 3,5,7,3'-OH and 3 (5),7,3',4'-OH of flavonol, respectively. After acid hydrolysis of the two fractions, F(I) was found to consist of quercetin and glucose, but F(II) only contained quercetin. F(I) and F(II) were confirmed by fast atom bombardment as quercetin 4'-glucoside and quercetin, respectively. The F(I) and F(II) fractions exhibited potent radical scavenging activity against DPPH, superoxide anion (O2·-), and hydroxyl (·OH) radicals. (C) 2000 Canadian Institute of Food Science and Technology.

Original languageEnglish
Pages (from-to)659-664
Number of pages6
JournalFood Research International
Issue number10
Publication statusPublished - 1999 Dec


  • Flavonols
  • Onion skin
  • Quercetin
  • Quercetin 4'-glucoside
  • Radical scavenger

ASJC Scopus subject areas

  • Food Science


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