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

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 degrada...

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Bibliographic Details
Published in:Bioscience, biotechnology, and biochemistry biotechnology, and biochemistry, 2008-08, Vol.72 (8), p.2176-2183
Main Authors: Zhang, G.(Okayama Univ. (Japan)), Zhu, B, Nakamura, Y, Shimoishi, Y, Murata, Y
Format: Article
Language:English
Subjects:
ADDITIF ALIMENTAIRE
ADITIVOS ALIMENTARIOS
ANTHOCYANE
anthocyanin
ANTHOCYANINS
Anthocyanins - chemistry
ANTOCIANINAS
Biological and medical sciences
carotenoid
CAROTENOIDE
CAROTENOIDES
CAROTENOIDS
Carotenoids - chemistry
DEUTERIO
DEUTERIUM
dimethyl tetrasulfide
FOOD ADDITIVES
FOTOLISIS
FREE RADICALS
Fundamental and applied biological sciences. Psychology
IRRADIACION ULTRAVIOLETA
IRRADIATION ULTRAVIOLETTE
Kinetics
LIGHT
LUMIERE
LUZ
Molecular Structure
Photochemistry
photodegradation
PHOTOLYSE
PHOTOLYSIS
Pressure
RADICAL LIBRE
RADICALES LIBRES
Spectrophotometry
Sulfides - chemistry
ULTRAVIOLET IRRADIATION
Ultraviolet Rays
UVA
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Summary: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 beta-carotene, zeaxanthin and beta-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 beta-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.
ISSN:0916-8451
1347-6947
DOI:10.1271/bbb.80251