Lect 4 BOL Carbo1

Lect 4 BOL Carbo1 - Lecture4:Carbohydrates1...

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Lecture 4: Carbohydrates 1 What are carbohydrates? Digestion/absorption of carbohydrates. Carbohydrates in your diet.
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Carbohydrates (CHO) “hydrated carbon” –  contains C, H and O. CHO in our diet comes  mostly from plant foods –  cereal grains, fruits,  vegetables, roots Produced by plants through  photosynthesis Prof Melvin Calvin –  Berkeley Nobel Prize for  studies on photosynthesis
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Two main classes of CHO Simple CHO – contain 1 or 2 glucose   molecules Monosaccharides Disaccharides Complex CHO- contain long chains of  glucose  molecules oligosaccharides polysaccharides
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3 Monosaccharides:  glucose,  fructose, galactose Same composition: C 6 H 12 O 6 alcohol sugar                      ketone sugar                    alcohol sugar
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Disaccharides
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alpha and beta bonds
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Oligosaccharides  Contain 3-10 monosaccharides Raffinose family oligosaccharides (RFO) Raffinose : galactose-glucose-fructose  (trisaccharide)  Stachyose: galactose-galactose-glucose- fructose (tetrasaccharide) RFO - found in soybean and other beans. We are  unable to digest RFO because of alpha  galactoside bond – undigested molecules pass  into large intestines – fermented by bacteria –  form gas – leads to flatulence  Product Beano TM  contains alpha galactosidase –  aids in digestion
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Polysaccharides: long chains of glucose  units
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Lect 4 BOL Carbo1 - Lecture4:Carbohydrates1...

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