期刊名称：Croatian Journal of Food Technology, Biotechnology and Nutrition
印刷版ISSN：1847-3423
电子版ISSN：1847-7461
出版年度：2010
卷号：5
期号：3-4
页码：87-95
出版社：Hrvatsko društvo prehrambenih tehnologa, biotehnologa i nutricionista
摘要：Biologically active folate forms are reduced metabolites of folic acid - tetrahydrofolates. Tetrahydrofolate acts as a carrier of one-carbon units in biochemical reactions that lead to the synthesis of the purines and the pyrimidines, which are the base constituents of deoxyribonucleic acid. In another important reaction, 5-methyltetrahydrofolate donates its methyl group to homocysteine to form methionine. The predominant folate vitamers in animal tissues are polyglutamyl forms of tetrahidrofolate, 5-methyltetrahydrofolate, and 10-formyltetrahydrofolate; tetrahydrofolate is main folate form found in several fi sh species while the plant tissues contain mainly 5-methyltetrahydrofolate. Folic acid can be isolated from liver but in most other foods it does not occur naturally to a signifi cant extent. Presence of folic acid may occur due to oxidation, as an oxidation of tetrahydrofolates in foods stored in the presence of oxygen. Folate loss may occur during food processing, or as result of cooking and food storage. The degree of loss can be infl uenced by the type of food, oxygen content, chemical surrounding, heating and applied cooking method as well as the folate form present in food.
