Carbohydrates

  • Created by: charley
  • Created on: 17-08-18 11:36
Monosaccharides
Simplest sugars available
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Monosaccharide functions
Energy source, building blocks for larger molecules, intermediates in reactions and constituents of nucleotides
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Disaccharides
Two monosaccharides bonded together by a glycosidic bond
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Polysaccharides
Large, complex polymers formed from a large number of monosaccharide units, linked together by glycosidic bonds
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Test for starch
Iodine solution reacts with starch resulting in a colour change from orange to blue/black
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Test for reducing sugars
Solution is heated with Benedict's reagents at 70 degrees Celsius. A positive result shows a colour change from blue to brick red
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Test for non-reducing sugars
Solution is heated with HCl (which hydrolyses the glycosidic bonds). NaOH is the added to neutralise. Solution is then heated with Benedict's reagent. A positive test gives a colour change from blue to brick red
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Quantitive test for sugars
Solution is heated with Benedict's reagent and a biosensor is used to give a numerical value for a positive test.
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Other cards in this set

Card 2

Front

Energy source, building blocks for larger molecules, intermediates in reactions and constituents of nucleotides

Back

Monosaccharide functions

Card 3

Front

Two monosaccharides bonded together by a glycosidic bond

Back

Preview of the back of card 3

Card 4

Front

Large, complex polymers formed from a large number of monosaccharide units, linked together by glycosidic bonds

Back

Preview of the back of card 4

Card 5

Front

Iodine solution reacts with starch resulting in a colour change from orange to blue/black

Back

Preview of the back of card 5
View more cards

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