Qi Jin F, Jia Cai H, Shin Jung A, Woo Jeong M, Wang Xiang Y, Park Jong T, Hong Soon T, Lee K-T
Dept. of Food Science and Technology, Chungnam National Univ, 99 Daehak-ro, Yuseong-gu, Daejeon, 305-764, South Korea.
Sericultural Research Inst., Chinese Acad. of Agricultural Sciences, Jiangsu Univ. of Science and Technology, Zhenjiang, 212018, China.
J Food Sci. 2016 Feb;81(2):C317-23. doi: 10.1111/1750-3841.13196. Epub 2015 Dec 31.
In this study, a pH-stat digestion model and a simulated in vitro digestion model were employed to evaluate the digestion degree of lipids depending on different acylglycerols and acyl chain length (that is, diacylglycerol [DAG] compared with soybean oil representing long-chain triacylglycerol compared with medium-chain triacylglycerol [MCT]). In the pH-stat digestion model, differences were observed among the digestion degrees of 3 oils using digestion rate (k), digestion half-time (t1/2 ), and digestion extent (Φmax). The results showed the digestion rate order was MCT > soybean oil > DAG. Accordingly, the order of digestion half-times was MCT < soybean oil < DAG. In simulated in vitro digestion model, digestion rates (k') and digestion half-times (t'1/2 ) were also obtained and the results showed a digestion rate order of MCT (k' = 0.068 min(-1) ) > soybean oil (k' = 0.037 min(-1) ) > DAG (k' = 0.024 min(-1) ). Consequently, the order of digestion half-times was MCT (t'1/2 = 10.20 min) < soybean oil (t'1/2 = 18.74 min) < DAG (t'1/2 = 29.08 min). The parameters obtained using the 2 models showed MCT was digested faster than soybean oil, and that soybean oil was digested faster than DAG.
在本研究中，采用pH值恒定消化模型和体外模拟消化模型，根据不同的酰基甘油和酰基链长度（即二酰基甘油[DAG]与代表长链三酰基甘油的大豆油相比，与中链三酰基甘油[MCT]相比）来评估脂质的消化程度。在pH值恒定消化模型中，使用消化速率（k）、消化半衰期（t1/2）和消化程度（Φmax）观察到3种油的消化程度存在差异。结果表明，消化速率顺序为MCT>大豆油>DAG。因此，消化半衰期的顺序为MCT<大豆油<DAG。在体外模拟消化模型中，也获得了消化速率（k'）和消化半衰期（t'1/2），结果显示消化速率顺序为MCT（k' = 0.068 min-1）>大豆油（k' = 0.037 min-1）>DAG（k' = 0.024 min-1）。因此，消化半衰期的顺序为MCT（t'1/2 = 10.20 min）<大豆油（t'1/2 = 18.74 min）<DAG（t'1/2 = 29.08 min）。使用这两种模型获得的参数表明，MCT的消化速度比大豆油快，大豆油的消化速度比DAG快。
