Abstract
Changes in the fatty acid composition of docosahexaenoic acid (DHA)-producing Schizochytrium limacinum SR21 were investigated. The addition of cyanocobalamin, which is an active component of vitamin B12, decreased the content of odd-chain fatty acids such as pentadecanoic acid (C15:0) and heptadecanoic acid (C17:0). Cyanocobalamin may upregulate the cobalamindependent methylmalonyl-CoA mutase, which converts propionic acid to succinic acid, thereby decreasing the content of odd-chain fatty acids. The addition of p-toluic acid resulted in a decrease in docosapentaenoic acid (DPA, 22:5n-6) content and an increase in eicosapentaenoic acid (EPA, 20:5n-3) content in a dose-dependent manner. Two additional peaks of fatty acids, characterized as Δ4,7,10,14-eicosatetraenoic acid (20:4n-7) and Δ4,7,10,14- docosatetraenoic acid (22:4n-9), were detected.
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