1 Structure of Carbohydrates

1 Structure of Carbohydrates - Carbohydrates

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Carbohydrates Jurgens and Bregendahl’s Animal Feeding  and Nutrition pp. 8-27
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Structure of Carbohydrates
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Sources of Carbohydrates Animal products Plants - major source   Minor except milk (lactose)   Starches and sugars: storage of energy  Cellulose and hemicellulose: structural
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Nutrient Composition of an  Adult Steer Water 54% Fat 26% Protein 15% Ash 4.6% Carbohydrate <1% little stored in the  animal body
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Carbohydrates (CHO) C:H:O (1:2:1) The most abundant organic molecules  in nature Sources Major component of plant tissue Comprise up to 70% or more of dry matter of forages Make up less than 1% of the weight of animals Sugars, starch, cellulose, gums
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Carbohydrates Carbohydrates are polyhydroxy  aldehydes or ketones Aldehyde Ketone
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Classification Classified according to the number  of sugar molecules: Most plants contain different types of  carbohydrates than animals Monosaccharides - 1 unit Disaccharides - 2 units Oligosaccharides - 3 to 10 units Polysaccharides - Greater than 10  units
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Monosaccharides (C n H 2n O n ) Classified by the number of  carbon atoms: 3-C triose 4-C tetrose 5-C pentose 6-C hexose nutritionallyi mportant Sugars that contain four or more carbons exist primarily in cyclic form
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Monosaccharides Pentoses  (5C) Xylose and arabinose Component in hemicellulose, glycoproteins Ribose Found in every living cell Found in compounds involved in metabolism: ATP/ADP Riboflavin DNA/RNA
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This document was uploaded on 02/14/2012.

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1 Structure of Carbohydrates - Carbohydrates

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