Lecture 14 - Lecture 14 Carbohydrate Digestion and...

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Lecture 14 Carbohydrate Digestion and Absorption The major enzyme in starch digestion is α –amylase. Sites of starch digestion: 1. Mouth – some breakdown by α –amylase (Food is not in the mouth long.) 2. Stomach – limited breakdown, due to decrease in pH 3. Intestine – site of most breakdown (Food spends most of its time here.) The α –amylase enzyme is soluble and generates primarily maltose and short chain oligosaccharides. Enzymes on the intestinal brush border convert dissacharides into monosaccharides. Overview of Starch Digestion (Ref. 4)
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Absorption of Sugar Glucose and galactose are absorbed by a sodium-glucose transporter (SGLT-1) located on the intestinal cells. SGLT-1 uses the energy generated by the Na + /K + ATPase transporter to bring both glucose and galactose into the intestinal cell. This is an active transport mechanism, which goes against a concentration gradient. Fructose can be absorbed by a separate active transport
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This note was uploaded on 01/19/2010 for the course NTR 342 taught by Professor Tillman during the Fall '09 term at University of Texas at Austin.

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Lecture 14 - Lecture 14 Carbohydrate Digestion and...

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