多膜传质和食物消化传质的时间常数:应用于肠片模型

T. Langrish
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引用次数: 1

摘要

这篇综述强调了质量传递在动物食物消化过程中的作用。在食物成分的溶解过程中,可能会有几个传质步骤,从食物本身开始,进入消化液,然后通过胃肠道壁。这些步骤产生一系列传质膜阻力,其中一个膜阻力通常限制了整个传质过程。传质速率、传质系数以及食物消化过程中不同部分的时间尺度和时间常数都是相互联系的,并且这种联系已经得到了解释。在食物消化过程的某些部分,传质过程的时间常数与食物消化的停留时间相似,强调了传质在食物消化的这些部分(如十二指肠)的重要性。体内人类消化系统和体外肠道芯片的质量传递和运输行为可能非常相似,这表明,无论是体外(肠道芯片)还是体内,肠壁上的细胞都可能看到类似的营养物质向细胞的运输行为,以及废物从细胞中流出的运输行为。
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Multifilm Mass Transfer and Time Constants for Mass Transfer in Food Digestion: Application to Gut-on-Chip Models
This review highlights the involvement of mass transfer in animal food-digestion processes. There may be several mass-transfer steps during the dissolution of food components, starting from the food itself, moving into the digestive juices, then moving through the walls of the gastrointestinal tract. These steps create a sequence of film resistances to mass transfer, where one film resistance often limits the overall mass-transfer process. Mass-transfer rates, mass-transfer coefficients, and the time scales and time constants for different parts of the food-digestion process are all interlinked, and the connections have been explained. In some parts of the food-digestion process, the time constants for the mass-transfer process are similar to the residence times for food digestion, emphasising the importance of mass transfer in these parts of food digestion, such as the duodenum. The mass-transfer and transport behaviour for in vivo human digestive systems and in vitro guts-on-a-chip may be very similar, suggesting that cells on the intestine walls, whether in vitro (guts-on-a-chip) or in vivo, may see similar transport behaviour for both nutrients towards the cells, and waste products away from them.
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