Effects of Cold Shock Treatment on Total Lipid Content and Fatty Acid Composition of Aurantiochytrium limacinum strain mh0186

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  • Taoka Yousuke
    Department of Biological Production and Environmental Science, Faculty of Agriculture, University of Miyazaki
  • Nagano Naoki
    Department of Biological Production and Environmental Science, Faculty of Agriculture, University of Miyazaki
  • Okita Yuji
    Nippon Suisan Kaisha Ltd.
  • Izumida Hitoshi
    Nippon Suisan Kaisha Ltd.
  • Sugimoto Shinichi
    Nippon Suisan Kaisha Ltd.
  • Hayashi Masahiro
    Department of Biological Production and Environmental Science, Faculty of Agriculture, University of Miyazaki

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To examine the effect of cold shock treatment on the fatty acid composition of Aurantiochytrium limacinum strain mh0186, a marine thraustochytrid, we cultivated this strain at 28°C for 72 h with shaking and stored the obtained biomass at 10°C for 72 h. A growth experiment was carried out for comparison, wherein strain mh0186 was grown at 10 and 15°C for 72 h with shaking, and it was found that the unsaturation of fatty acids was accelerated relative to that at 28°C. In the cold shock experiment, the total lipid content significantly increased during storage at 10°C for 72 h. Overall, the percentage of unsaturated fatty acids such as docosahexaenoic acid was almost stable while that of n-6 docosapentaenoic acid decreased slightly, but significantly, relative to that in the growth experiment.

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