Zhang Yan, Zheng Zhaojun, Liu Chunhuan, Tan Chin-Ping, Xie Kui, Liu Yuanfa
State Key Laboratory of Food Science and Technology, School of Food Science and Technology, National Engineering Research Center for Functional Food, National Engineering Laboratory for Cereal Fermentation Technology, Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province, Jiangnan University, 1800 Lihu Road, Wuxi, Jiangsu 214122, People's Republic of China.
Department of Food Technology, Faculty of Food Science and Technology, University Putra Malaysia, Selangor 410500, Malaysia.
Food Chem. 2022 Sep 1;387:132844. doi: 10.1016/j.foodchem.2022.132844. Epub 2022 Mar 29.
Different drying techniques impart distinguishing characteristics to goat milk, particularly to its fat globules. Here, we investigated the difference between freeze-dried and spray-dried goat milk (FGM and SGM) fat globules on lipid profiling and in vitro infant gastrointestinal digestibility. The former presented higher levels of MUFA (31.76%) and lower cholesterol content (1.20 ± 0.02 mg/g). Some important long-chain polyunsaturated triacylglycerols such as POL (16:0/18:1/18:2), PSL (16:0/18:0/18:2), and POO (16:0/18:1/18:1), also had better preservation in FGM. Moreover, we detected more species of lysophospholipid in FGM than SGM, accounting for 2.51% and 0.71% of total phospholipids, respectively. More intriguingly, FGM, which has better membrane integrity and larger particle size, showed longer lag during gastric digestion and lower level of final lipolysis throughout gastrointestinal digestion. Therefore, our results showed the effects of different drying techniques on lipid profiling and digestibility of goat milk, providing significant insight for appropriate utilization of goat milk in infant nutrition.
不同的干燥技术赋予山羊奶独特的特性，尤其是其脂肪球。在此，我们研究了冻干和喷雾干燥山羊奶（FGM和SGM）脂肪球在脂质谱分析和体外婴儿胃肠道消化率方面的差异。前者的单不饱和脂肪酸（MUFA）含量较高（31.76%），胆固醇含量较低（1.20±0.02毫克/克）。一些重要的长链多不饱和三酰甘油，如POL（16:0/18:1/18:2）、PSL（16:0/18:0/18:2）和POO（16:0/18:1/18:1），在FGM中也有更好的保存。此外，我们检测到FGM中的溶血磷脂种类比SGM更多，分别占总磷脂的2.51%和0.71%。更有趣的是，FGM具有更好的膜完整性和更大的粒径，在胃消化过程中显示出更长的延迟期，并且在整个胃肠道消化过程中的最终脂解水平较低。因此，我们的结果显示了不同干燥技术对山羊奶脂质谱和消化率的影响，为山羊奶在婴儿营养中的合理利用提供了重要见解。
