Zhang Jie, Liu Dasong, Xie Yunqi, Yuan Jiajie, Wang Keyu, Tao Xiumei, Hemar Yacine, Regenstein Joe M, Liu Xiaoming, Zhou Peng
State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province 214122, China.
State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu Province 214122, China.
Food Chem. 2023 Aug 1;416:135865. doi: 10.1016/j.foodchem.2023.135865. Epub 2023 Mar 6.
In vitro coagulation and digestion of caprine and bovine micellar casein concentrate (MCC) with or without partial colloidal calcium depletion (deCa) were studied under simulated adult and elderly conditions. Gastric clots were smaller and looser for caprine than bovine MCC, and were further looser with deCa and under elderly condition for both caprine and bovine MCC. Casein hydrolysis and concomitant formation of large peptides was faster for caprine than bovine MCC, and with deCa and under adult condition for caprine and bovine MCC. Formation of free amino groups and small peptides were faster for caprine MCC, and with deCa and under adult condition. Upon intestinal digestion, proteolysis occurred rapidly, and was faster under adult condition, but showed less differences with increasing digestion between caprine and bovine MCC, and with and without deCa. These results suggested weakened coagulation and greater digestibility for caprine MCC and MCC with deCa under both conditions.
在模拟的成人和老年人条件下，研究了有或没有部分胶体钙消耗（脱钙，deCa）的山羊和牛微胶粒酪蛋白浓缩物（MCC）的体外凝血和消化情况。与牛MCC相比，山羊MCC形成的胃凝块更小、更松散，并且在脱钙情况下以及在成人和老年人条件下，山羊和牛MCC的胃凝块都更松散。与牛MCC相比，山羊MCC的酪蛋白水解及伴随的大肽形成更快，并且在脱钙情况下以及在成人条件下，山羊和牛MCC的酪蛋白水解及大肽形成都更快。山羊MCC中游离氨基和小肽的形成更快，并且在脱钙情况下以及在成人条件下也是如此。在肠道消化时，蛋白水解迅速发生，并且在成人条件下更快，但随着消化的进行，山羊和牛MCC之间以及有和没有脱钙之间的差异较小。这些结果表明，在两种条件下，山羊MCC和脱钙的MCC的凝血减弱且消化率更高。
