INTRAMOLECULAR FATTY ACID DISTRIBUTION IN THE MILK FAT TRIGLYCERIDES OF SEVERAL SPECIES.
INTRAMOLECULAR FATTY ACID DISTRIBUTION IN THE MILK FAT TRIGLYCERIDES OF SEVERAL SPECIES.
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DOI：
10.3168/jds.s0022-0302(65)88350-3
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发表时间：
1965-07
影响因子：
3.5
通讯作者：
C. Freeman;E. Jack;L. Smith
中科院分区：
文献类型：
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作者：
C. Freeman;E. Jack;L. Smith
摘要 通过胰脂肪酶水解程序检查了一些具有营养价值的乳脂的甘油三酯中脂肪酸的分布。乳脂来自奶牛、印度水牛、山羊、绵羊和人类。采用显着缩短的水解时间，通过将原始甘油三酯组合物与经受这种水解的随机酯交换乳脂的残余甘油单酯组合物进行比较来验证其用途。某些脂肪酸在所有检测的乳脂中具有相似的分布模式，但反刍动物脂肪和人类脂肪之间的一些差异在甘油三酯的 2-或 1-,3-位酯化的各个脂肪酸的相对浓度上是明显的。因此，短链脂肪酸C 4:0 和C 6:0 在所有物种中主要但不排他地在1-,3-位被酯化。 C 14:0 和 C 15:0 酸优先在 2-位上酯化，而 C 18:0 则集中在每种脂肪的 1-,3-位上。人乳脂肪的显着之处在于，与反刍动物的乳脂肪相比，2-位上的 C 16:0 比例以及 1-,3-位上的 C 18:0 和 C 18:1 比例更大。
Abstract The distribution of fatty acids in the triglycerides of some milk fats of nutritional importance was examined by the pancreatic lipase hydrolysis procedure. Milk fats were from the cow, Indian buffalo, goat, sheep, and human. A substantially shortened hydrolysis period was employed, its use validated by a comparison of the original triglyceride composition with the residual mono-glyceride composition of a randomly interesterified milk fat subjected to such hydrolysis. Certain fatty acids had a similar distribution pattern in all of the milk fats examined, but some differences between the ruminant and human fats were evident in the relative concentration of individual fatty acids esterified at either the 2- or the 1-,3-positions of the triglycerides. Thus, the short-chain fatty acids C 4:0 and C 6:0 were esterified predominantly, though not exclusively, at the 1-,3-positions in all species. C 14:0 and C 15:0 acids were preferentially esterified at the 2-position, whereas C 18:0 was concentrated at the 1-,3-positions in each fat. Human milk fat was notable in having a greater proportion of C 16:0 in the 2-position, and of C 18:0 and C 18:1 in the 1-,3-positions than the milk fats of ruminants.