Effects of riboflavin photosensitization on daidzein and its photosensitized derivatives

Chan Uk Park, Ju Dong Yeo, Min Hee Park, Jin Byung Park, Jae Hwan Lee

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8 Scopus citations


Photosensitized compounds from daidzein were studied in a riboflavin model system under visible light irradiation by high-performance liquid chromatography (HPLC). As the period of light irradiation increased, concentration of daidzein decreased significantly (P < 0.05) and new peaks of daidzein derivatives were observed and changed during photosensitization. Three new peaks from photosensitized daidzein were tentatively identified as 7-, 3′,4′-trihydroxyisoflavone (or 3′-hydroxydaidzein) and 2 dimmers of daidzein by a combination of HPLC-mass spectrometry (MS) and retention times of standard compounds by HPLC. Addition of sodium azide and removal of headspace oxygen treatment affected the formation of newly formed peaks. The type I pathway of riboflavin photosensitization played more important roles than type II pathways on the formation of daidzein derivatives.

Original languageEnglish
Pages (from-to)C659-C666
JournalJournal of Food Science
Issue number8
StatePublished - Oct 2010


  • Daidzein
  • Photosensitized products
  • Riboflavin
  • Singlet oxygen


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