Division of Food Production and Quality, School of Agriculture, Policy and Development, University of Reading, Earley Gate, Reading RG6 6AR, United Kingdom.
Food Chem. 2013 Nov 1;141(1):274-81. doi: 10.1016/j.foodchem.2013.02.116. Epub 2013 Mar 7.
Milk and dairy products are major sources of fat in the human diet, but there are few detailed reports on the fatty acid composition of retail milk, trans fatty acids in particular, and how these change throughout the year. Semi-skimmed milk was collected monthly for one year from five supermarkets and analysed for fatty acid composition. Relative to winter, milk sold in the summer contained lower total saturated fatty acid (SFA; 67 vs 72 g/100g fatty acids) and higher cis-monounsaturated fatty acid (MUFA; 23 vs 21 g/100g fatty acids) and total trans fatty acid (6.5 vs 4.5 g/100g fatty acids) concentrations. Concentrations of most trans-18:1 and -18:2 isomers also exhibited seasonal variation. Results were applied to national dietary intakes, and indicated that monthly variation in the fatty acid composition of milk available at retail has limited influence on total dietary fatty acid consumption by UK adults.
牛奶和奶制品是人类饮食中脂肪的主要来源，但关于零售牛奶的脂肪酸组成，特别是反式脂肪酸，以及它们在全年如何变化的详细报告很少。从五家超市每月采集一份半脱脂牛奶，并对其脂肪酸组成进行分析。与冬季相比，夏季销售的牛奶总饱和脂肪酸（SFA；67 克/100 克脂肪酸比 72 克/100 克脂肪酸）和顺式单不饱和脂肪酸（MUFA；23 克/100 克脂肪酸比 21 克/100 克脂肪酸）以及总反式脂肪酸（6.5 克/100 克脂肪酸比 4.5 克/100 克脂肪酸）浓度较低。大多数反式-18:1 和 -18:2 异构体的浓度也表现出季节性变化。研究结果应用于全国饮食摄入量，表明零售牛奶脂肪酸组成的每月变化对英国成年人总膳食脂肪酸摄入量的影响有限。
