In this paper, we describe the change in the nutritional ingredients such as the proximate composition, minerals, free amino acid, cholesterol, fatty acid composition, eicosapentaenoic acid (EPA) content and docosahexaenoic acid (DHA) content when cooking using various methods of heating for 7 kinds of fish. The obtained results are as follows:
1. When cooking fillets:
As the decrease in the moisture content was remarkable, the mineral, taurine, EPA and DHA contents apparently increased.
2. When cooking the whole fish:
1) The fish with a low lipid content (equal to or less than 5%) As the decrease in the moisture content was greater than the exudation or elution of the lipid, the increases in the EPA and DHA contents were recognized by the apparent increase in the lipid content, but the taurine content decreased. In case of the frying due to the substitution of frying oil and the fish oil, the EPA and DHA contents decreased about 50%. The taurine content also decreased.
2) The fish with a high lipid content (equal to more than 17%)
As the exudation or elution of the lipids was remarkable and the moisture content apparently increased, the taurine content had a tendency to increase during broiling, but the EPA and DHA contents decreased about 50%.
3) The fish with a lipid content between 1) and 2).
Both the exudation or elution of lipids and the decrease in the moisture showed the tendency of decreased EPA, DHA and taurine. This tendency was significant during broiling.
Polyunsaturated fatty acid was made unstable by the heat and light, but no significant difference in the fatty acid composition was recognized just after general cooking. However, a remarkable difference in the absolute quantity of EPA and DHA was recognized due to the cooking method or lipid content during the fishing season.
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