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Reactions between a carotenoid, fucoxanthin and 1,1-diphenyl-2-picrylhydrazyl were investigated both under anoxic and aerobic conditions. Fucoxanthin equimolarly reacted with 1,1-diphenyl-2-picrylhydrazyl under anoxic conditions. Under aerobic conditions, only a part of fucoxanthin consumed 1,1-diphenyl-2-picrylhydrazyl and the degree of reaction fluctuated with repeated trials. beta-Carotene or other carotenoids, beta-cryptoxanthin, zeaxanthin, licopen and lutein, were also examined in the reaction with 1,1-diphenyl-2-picrylhydrazyl under anoxic conditions. All these compounds scarcely reacted with 1,1-diphenyl-2-picrylhydrazyl.
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Nomura et al. (1997) studied this question.
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