trans fatty acids in milk produced by women in the United States
trans fatty acids in milk produced by women in the United States
复制标题
DOI：
10.1093/ajcn/82.6.1292
复制
发表时间：
2005-12-01
影响因子：
7.1
通讯作者：
McGuire, MA
中科院分区：
文献类型：
--
作者：
Mosley, EE;Wright, AL;McGuire, MA
背景：反式脂肪酸（FAs）已被确定对人体健康有负面影响。必须检查人乳脂肪的反式脂肪酸组成，以确定其对婴儿食用的牛奶营养质量的影响。目的：我们试图确定人乳中单个反式脂肪酸异构体和总反式脂肪酸异构体（含有至少一个反式双键的脂肪酸的总和），并确定单个脂肪酸与乳脂浓度（% by wt）之间的关系。设计：确定生活在美国西南部妇女的牛奶样本（n = 81）的FA组成。个体18：它的异构体被分离了。检查了每种FA、总反式FAs、相似FAs组和乳脂浓度之间的相关性。结果：平均总反式FA浓度为7.0±2.3%（范围：2.5 ~ 13.8%）。总18:1t的浓度为5.1 +/- 2.0%（范围：1.5 ~ 11.6%），其中δ 10t（范围：δ 9 ~ 12t）是最丰富的异构体。结论：美国妇女的乳脂含有反式脂肪酸的浓度与加拿大妇女的乳脂相似，但高于其他国家妇女的乳脂。从浓度递减的顺序看，δ 10t、δ 11t、δ 9t和δ 12t异构体占总量的78.9%。这些脂肪酸通常来源于部分氢化的植物油和饲料中的反刍动物脂肪。反式脂肪酸总浓度与乳脂浓度无相关性。
Background: trans Fatty acids (FAs) have been identified as negatively affecting human health. The trans FA composition of human milk fat must be examined to establish its influence on the nutritional quality of milk consumed by infants.Objective: We sought to ascertain the individual and total trans FA isomers (sum of FAs containing at least one trans double bond) in human milk and to identify relations between individual FAs and milk fat concentration (% by wt).Design: The FA composition of milk samples (n = 8 1) from women living in the southwestern United States was ascertained. The individual 18: It isomers were separated. Correlations between each FA, total trans FAs, groups of similar FAs, and milk fat concentrations were examined.Results: The mean total trans FA concentration was 7.0 +/- 2.3% (range: 2.5-13.8%). The concentration of total 18:1t was 5.1 +/- 2.0% (range: 1.5-11.6%), and Delta 10t (range: Delta 9-12t) was the most abundant isomer.Conclusions: Milk fat from women living in the United States contains concentrations of trans FAs similar to those in milk from Canadian women but greater than those reported in milk from women in other countries. In decreasing order of concentration, the Delta 10t, Delta 11t, Delta 9t, and Delta 12t isomers represented 78.9% of the total 18:1t. These FAs generally originate from partially hydrogenated vegetable oils and ruminant fat in the diet. No relation was found between the concentration of total trans FAs and milk fat concentration.