Singlet oxygen quenching ability of astaxanthin esters from the green alga Haematococcus pluvialis |
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Authors: | M Kobayashi Y Sakamoto |
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Institution: | (1) Research Laboratory of Higashimaru Shoyu Co., Ltd., 100-3 Tominaga, Tatsuno, Hyogo, 679-4193, Japan |
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Abstract: | The singlet oxygen quenching activities of carotenoids, -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, -carotene, free astaxanthin, its mono- and di-ester, required for 50% inhibition of lipid oxidation were 40, 8, 9, and 0 M in 100% ethanol and, 14, 16, 10, and 7 M 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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Keywords: | astaxanthin carotenes Haematococcus pluvialis oxidation singlet oxygen |
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