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Nutrition Research:共轭亚油酸含量高食物可增加乳汁营养

来源:科学网 2008-09-10 12:21

2008年8月一期的爱思维尔期刊《营养研究》(Nutrition Research)刊登了美国新罕布夏大学的一项最新研究。研究发现,哺乳期的妇女食用含共轭亚油酸含量高的食物后,其乳汁中的共轭亚油酸含量也会在较短时间内达到较高水平。

共轭亚油酸是天然存在于许多生物体内的一类含有共轭双键的微量不饱和脂肪酸,简称CLA。作为亚油酸的异构体,共轭亚油酸这种天然活性营养物质是一种功能型不饱和脂肪酸。大量的研究证明,CLA具有抑制肿瘤,抗氧化,降低胆固醇、甘油三酯和低密度脂蛋白,延缓动脉粥样硬化,提高免疫力,以及提高骨骼密度等多种重要生理功能。

研究中,有7位处于哺乳期的母亲分别食用一些富含CLA的饼干和正常饼干,其中前者的CLA含量是后者的8倍。随后,研究人员在两天内每隔4至6小时会对这些母亲的乳汁进行测试分析, 结果发现,食用富含CLA饼干母亲的乳汁里面CLA含量也非常高,较食用正常饼干的母亲的乳汁高出46%。同时研究还发现,食用CLA含量较高饼干后的8至28小时内其乳汁的CLA含量最高。

研究人员认为,此项研究的最大意义在于发现了哺乳的妇女食用富含CLA的食物后,其乳汁的CLA含量会在短时期内有很大的提高,这将非常有利于婴幼儿对CLA的需求。(生物谷Bioon.com)

生物谷推荐原始出处:

Nutrition Research,doi:10.1016/j.nutres.2008.04.001,Athena A. Moutsioulis, Gale B. Carey

Human breast milk enrichment in conjugated linoleic acid after consumption of a conjugated linoleic acid–rich food product: a pilot study

Athena A. Moutsioulis, Daniel C. Rule, Charles M. Murrieta, Dale E. Bauman, Adam L. Lockd, David M. Barbanoe and Gale B. Carey

Human breast milk is a complex mixture of organic and inorganic compounds. Some compounds, such as conjugated linoleic acid (CLA), come partly from the mother's diet and are produced by the mother's body and secreted into the milk. Although several studies have examined the effect of chronic CLA supplementation on breast milk CLA appearance, little is known about the transfer of food CLA to breast milk over the short term. The objective of this study was to conduct a preliminary analysis of the kinetics of CLA appearance in breast milk over the short term. Seven women expressed breast milk at 4- to 6-hour intervals for 2 days after eating either CLA-enriched (1912 mg CLA) or control (231 mg CLA) cookies. Milk samples were freeze-dried, fatty acid methyl esters were prepared using methanolic-potassium hydroxide (KOH), and CLA isomers were quantified by gas chromatography. Analysis revealed the following: (1) CLA enrichment of total fatty acids in the breast milk for 48 hours post ingestion of the CLA-enriched cookies was 2.9-fold above control; (2) total breast milk CLA content for 48 hours post CLA-enriched cookies ingestion was 46% greater than post CLA-moderate cookies ingestion; (3) after ingestion of the CLA-enriched cookies, breast milk CLA enrichment plateaued between 8 to 28 hours. This preliminary study suggests that breast milk fatty acids are enriched in CLA compared to control within 28 hours after the ingestion of a CLA-rich food product and invites further research on the extent and timing with which breast milk composition reflects dietary CLA content.

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