College of Food Science and Technology, Hunan Agricultural University, Changsha 410114, China; Key Laboratory of Functional Dairy, Co-constructed by Ministry of Education and Beijing Government, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China.
Key Laboratory of Functional Dairy, Co-constructed by Ministry of Education and Beijing Government, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China.
Food Chem. 2020 Jun 1;314:126160. doi: 10.1016/j.foodchem.2020.126160. Epub 2020 Jan 7.
Lipolysis products released during digestion exert positive metabolic impacts on the nutrition of newborns. However, the lipolysis behavior of yak milk lipids during digestion remains unknown. In this study, the simulated in vitro infant gastrointestinal digestion of cow, yak and standardized yak milk fat globules the same size as those from cow milk (Cow MF, Yak MF and Yak SMF) were compared. Although Cow MF showed a higher lipolysis rate at the beginning of gastric digestion, Yak MF and Yak SMF exhibited a higher lipolysis level during later gastrointestinal digestion. Higher hydrolysis efficiency of yak milk lipids was due to their lipid properties, including their composition and structure. Furthermore, yak milk lipids released more unsaturated fatty acids than Cow MF throughout digestion. This study highlights the crucial role of lipid characteristics in the efficient digestion of milk lipids and provides new insight for the design of yak milk infant diets.
在消化过程中释放的脂解产物对新生儿的营养有积极的代谢影响。然而，牦牛乳脂质在消化过程中的脂解行为尚不清楚。本研究比较了模拟婴儿胃肠道消化的牛乳、牦牛乳和与牛乳大小相同的标准化牦牛乳脂肪球（牛乳 MF、牦牛 MF 和牦牛 SMF）。虽然牛乳 MF 在胃消化开始时表现出更高的脂解率，但牦牛 MF 和牦牛 SMF 在后期胃肠道消化中表现出更高的脂解水平。牦牛乳脂质具有更高的水解效率，这与其脂质特性有关，包括其组成和结构。此外，在整个消化过程中，牦牛乳脂质释放出的不饱和脂肪酸多于牛乳 MF。本研究强调了脂质特性在牛奶脂质高效消化中的关键作用，为设计牦牛乳婴儿配方提供了新的见解。
