1. Milk is approximately 87.5% water, with the rest consisting of solids such as
ID: 138582 • Letter: 1
Question
1. Milk is approximately 87.5% water, with the rest consisting of solids such as fats and carbohydrates. Human milk obtained by nursing infants contains 7-8% lactose (8 g/dL) almost double the 4-5% found in cow's milk. The enzyme lactase hydrolyzes lactose to galactose and glucose. The conversion reaction is as follows C12H22011 (lactose)+ H20 lactase CeH120s (glucose) +CeHi20s (galactose) A baby is nursing at a rate of 1.5 mL/min. The partially digested milk containing the glucose and galactose leave the baby's stomach. Assume the reaction goes to completion. a) What is the reaction rate for this reaction? What is the limiting reactant? What are the fractional conversions of C12H22011 and H20? b) Determine the outlet flow rates of the elements C, H, O in the partially digested milk entering the small intestine. Assume all liquids go to urine and all solids go to feces. Determine the mass flow rates of all compounds heading towards the urine and all products heading towards the feces.Explanation / Answer
Ans.) Most of the carbohydrates (about 90%) are digested in small intestine.
As it is already mentioned, lactose is digested to glucose and galactose.
The monosaccharide: glucose and galactose absorb in small intestine by active transport. Absorption or outlet flow rate of galactose is higher than the glucose.
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