Structure-dependent photodegradation of carotenoids accelerated by dimethyl tetrasulfide under UVA irradiation

Gongliang Zhang, Beiwei Zhu, Yoshimasa Nakamura, Yasuaki Shimoishi, Yoshiyuki Murata

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Carotenoids are used in wide-ranging food applications, but they are susceptible to degradation by many factors including light. We examined the photodegradation of five kinds of carotenoids and three kinds of anthocyanins to clarify which structures of pigments were favorable to accelerated degradation by sulfides under UVA irradiation. Under UVA irradiation, crocetin and crocin were decomposed more rapidly in the presence of dimethyl tetrasulfide than in the absence of the sulfide, but not as rapidly as β-carotene, zeaxanthin and β-cryptoxanthin were. However, cyanidin was decomposed more slowly in the presence of sulfide than in the absence of sulfide. Moreover, the photodegradation of kuromanin and keracyanin was not affected by the addition of a sulfide. We also examined the mechanism for this accelerated degradation. Normal hexane was more favorable to the photodegradation of β-carotene than methanol and ethanol. The accelerated degradation was inhibited by free radical scavengers, but enhanced by the addition of deuterium oxide. These results suggest that conjugated double bonds were favorable to the accelerated photodegradation by sulfide and that this reaction was mediated by free radicals.

Original languageEnglish
Pages (from-to)2176-2183
Number of pages8
JournalBioscience, Biotechnology and Biochemistry
Volume72
Issue number8
DOIs
Publication statusPublished - Sep 5 2008

Keywords

  • Anthocyanin
  • Carotenoid
  • Dimethyl tetrasulfide
  • Photodegradation
  • UVA

ASJC Scopus subject areas

  • Biotechnology
  • Analytical Chemistry
  • Biochemistry
  • Applied Microbiology and Biotechnology
  • Molecular Biology
  • Organic Chemistry

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