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Reducing sugars, non-reducing sugars & the Benedict's test -…
Reducing sugars, non-reducing sugars & the Benedict's test
Reducing sugars
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both aldose & ketose sugar are reducing agents when in an alkaline solution (normally ketose sugars aren't reducing) - meaning that their carbonyl groups can donate an electron
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when heated with a reducing sugar, the copper (II) ions are reduced to copper (I) ions & an orange-red precipitate copper (I) is formed
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sucrose is an exception (normally ketose sugars aren't educing) The reducing groups are involved in its glyosidic bond & aren't free to react.
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how to test for sucrose
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you then have glucose & fructose & the reducing carbonyl groups of these sugars are free to react with the Benedict's & will now produce a positive result
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how to tell if a mystery food is a reducing, non-reducing sugar or non sugar
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