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采用气相色谱法测定了足月顺产儿乳母不同泌乳期及一次喂奶时前、中、后段乳中脂肪酸含量。结果显示：随泌乳期的延长及一次喂奶时从前段、中段至后段，母乳中脂肪酸的绝对含量逐渐增加。初乳中饱和脂肪酸百分含量较低，不饱和脂肪酸百分含量较高，尤其是长链多不饱和脂肪酸含量丰富。中链脂肪酸（Ｃ８０、Ｃ１００、Ｃ１２０、Ｃ１４０）和单不饱和脂肪酸（Ｃ１６１）百分含量随泌乳期延长而升高，而长链饱和脂肪酸（Ｃ１６０、Ｃ１８０、Ｃ２００）和单不饱和脂肪酸（Ｃ１４１、Ｃ１８１）百分含量逐渐下降。母乳中长链多不饱和脂肪酸花生四烯酸（Ｃ２０４ω６）和二十二碳六烯酸（Ｃ２２６ω３）百分含量随泌乳期延长而显著下降。一次喂奶时的前、中和后段乳汁中脂肪酸的百分组成没有差异。与国外资料比，本研究母乳中亚油酸（Ｃ１８２ω６）和α－亚麻酸（Ｃ１８３ω３）含量较高，而软脂酸（Ｃ１６０）和硬脂酸（Ｃ１８０）含量较低。应大力提倡母乳喂养，且应充分利用初乳。
Gas chromatography was used to determine the content of fatty acids in milk of full-term cesarean delivery in different lactation periods and in one feeding. The results showed that with the prolongation of lactation and a feeding, the absolute content of fatty acids in breast milk gradually increased from the anterior segment, the middle segment to the posterior segment. Colostrum in the lower percentage of saturated fatty acids, higher percentage of unsaturated fatty acids, especially the content of long-chain polyunsaturated fatty acids. The percentages of medium chain fatty acids (C80, C100, C120, C140) and monounsaturated fatty acids (C161) increased with the prolongation of lactation, whereas the content of long chain saturated fatty acids (C160, C180, C200) and monounsaturated fatty acids , C181) percentage decreased gradually. The percentages of arachidonic acid (C204ω6) and docosahexaenoic acid (C226ω3) in long-chain polyunsaturated fatty acids in breast milk decreased significantly with the prolongation of lactation. There was no difference in the percentage of fatty acids in the milk before, during, and after a feeding. Compared with foreign data, the content of linoleic acid (C182ω6) and α-linolenic acid (C183ω3) in breast milk of this study was relatively high while the contents of palmitic acid (C160) and stearic acid (C180) were lower. Breastfeeding should be vigorously promoted and colostrum should be fully utilized.