Abstract
The singlet oxygen quenching activities of carotenoids, β-carotene, free astaxanthin, its monoester and its diester, were examined in vitro by a simple and rapid method for the measurement of Methylene Blue-sensitized photooxidation of linoleic acid in the hexane/ethanol solvent system. The concentrations of carotenoids, β-carotene, free astaxanthin, its mono- and di-ester, required for 50% inhibition of lipid oxidation were 40, 8, 9, and 0 μM in 100% ethanol and, 14, 16, 10, and 7 μM in 50% (v/v) hexane in ethanol, respectively. Astaxanthin esters function as powerful antioxidant agents under both hydrophobic and hydrophilic conditions.
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Kobayashi, M., Sakamoto, Y. Singlet oxygen quenching ability of astaxanthin esters from the green alga Haematococcus pluvialis . Biotechnology Letters 21, 265–269 (1999). https://doi.org/10.1023/A:1005445927433
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DOI: https://doi.org/10.1023/A:1005445927433