PAG 9.3 - qualitative testing for biological molecules

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8 Terms

1
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How does the reducing sugar test work

The sugar causes the copper ions in the benedicts to be reduced and form a brick red precipitate

2
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How does the non-reducing sugar test work

It doesn't reduce the copper ions and therefore the benedicts stay blue

3
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What causes different colours from a benedicts test

A higher amount of reduced copper ions

4
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What is the range of colours in a benedicts test

Green, yellow, orange, red

5
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How does a non-reducing sugar test work

The dilute HCl splits up the disaccharide in a hydrolysis so that it becomes two monosaccharides. These then behave normally in benedicts

6
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What types of sugars are monosaccherides

they are all reducing sugars

7
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Which disaccharides are reducing

maltose and lactose

8
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Which disaccharides are non-reducing

sucrose