Lecture 13 - Lecture 13 Structure of Carbohydrates Major...

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Lecture 13 Structure of Carbohydrates Major carbohydrates discussed in class: 1. glucose, fructose, galactose 2. sucrose, maltose, lactose 3. starch 4. fiber 5. glycogen Carbohydrates are classified as: 1. monosaccharides 1 carbohydrate molecule glucose, fructose, galactose 2. disaccharides 2 carbohydrate molecules sucrose, lactose, maltose 3. oligosaccharides 3 or more carbohydrate molecules part of starch or glycogen 4. polysaccharides – 10s to 100s of carbohydrate molecules starch, glycogen, fiber Major disaccharides: 1. Sucrose = glucose + fructose 2. Maltose = glucose + glucose
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3. Lactose = glucose + galactose
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Sources of disaccharides: 1. sucrose – major sweetener found in fruits, vegetables 2. maltose formed from starch breakdown 3. lactose – milk sugar The structure of sugars can be written in many ways. Glucose Structure (Ref. 1)
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Comparison of Glucose, Fructose and Galactose Structure (Ref. 1) Compare these to the monosaccharides found in DNA, RNA.
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Structure of Ribose Sugars (Ref. 4)
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Other Representations of Monosaccharides (Ref. 4)
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Lecture 13 - Lecture 13 Structure of Carbohydrates Major...

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