NUTR 3210 Lecture Notes - Lecture 5: Dietary Fiber, Fischer Projection, Oligosaccharide
18 Oct 2016
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Document Summary
Polysaccharides = around 9-10 ** almost exclusively glucose, what differs is how they are linked. Starch and cellulose (plant) ** cellulose is useless in humans, very simple structure s e a ri d h c c a s. Same molecular formula and sequence, but differ in 3d space. Exist in 2 forms = l vs. d. Chiral carbon = c w. 4 different atoms or groups. Based on direction of highest # chiral c. 2 monosaccharides attached by a glycosidic bond (formed btw 2 hydroxyl groups) Anomeric carbon hydroxyl group of one monosaccharide + the hydroxyl group at carbon 4/6 in other monosaccharide. Glycosidic bond can also be alpha or beta. Long strings or branches of monosaccharides (min. of 6) attached by glycosidic bonds. ** both exist in nature, but homopolysaccharides more abundant in food: pectin, cellulose. Both a dietary fibre and functional fibre. Found in bran, legumes, nuts, peas, etc : hemicellulose.
