Carbohydrates

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  • Created by: Khadidya
  • Created on: 24-02-18 15:41
What is the general formula of a monosaccaride
(CH20)n
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What is the test for reducing sugar
2cm3 of the food sample is added to 2cm3 of Benedict reagent, and is placed in a boiling water bath. The reducing sugar would reduce the copper sulfate into copper oxide forming a red insoluable precipitate, indicating the sample is a reducing sugar
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What is a reducing sugar
A reducing sugar has the ability to donate its electron to another chemical
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What is the test for non reducing sugars
Add 2 cm3 of sample to 2cm3 of hydrochloric acid in order to hydroyse the dissaccaride and break it into its monosaccarides. Sodium hydrogencarbonate is added to neutralise as BR works in alkali conditions. Re test by adding BR should be orange brow
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What is a condenstaion reaction
formation of polymers in which water is a product
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What is a hydrolysis reaction
When water is used to break down a polymer
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How are disaccharides formed from monosaccharides
Monosaccharides join together through condensation reactions meaning water is produced as well as a glycosidic bond
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How is lactose formed
alpha glucose and galactose
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How is sucrose formed
Alpha glucose and fructose
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How is maltose formed
Alpha glucose and Alpha glucose
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Why is the benedict test described as semi- quantitative
It is semi quantatative as the different colours give a indication of the concentration of the reducing sugar.
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Test for starch
Place 2cm3 o sample into test tube and add 2 drops of iodine, If sample goes blue black, starch is present.
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Card 2

Front

What is the test for reducing sugar

Back

2cm3 of the food sample is added to 2cm3 of Benedict reagent, and is placed in a boiling water bath. The reducing sugar would reduce the copper sulfate into copper oxide forming a red insoluable precipitate, indicating the sample is a reducing sugar

Card 3

Front

What is a reducing sugar

Back

Preview of the front of card 3

Card 4

Front

What is the test for non reducing sugars

Back

Preview of the front of card 4

Card 5

Front

What is a condenstaion reaction

Back

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