Reducing vs non-reducing sugars

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Cuspake
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#1
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#1
What's the difference between reducing and non--reducing sugars?
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Spelunker
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#2
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in a benedicts test reducing sugars will go from blue to brick red ( or yellow or green depending on exam board) non reducing sugars will stay blue. i think the only non reducing sugar you need to know is sucrose.
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Cuspake
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(Original post by Spelunker)
in a benedicts test reducing sugars will go from blue to brick red ( or yellow or green depending on exam board) non reducing sugars will stay blue. i think the only non reducing sugar you need to know is sucrose.
Thank you! What actually is the difference in structure between them though please?
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Spelunker
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non-reducing sugars cannot act as a reducing agent becuase they dont have a free aldehyde group or ketone group. they have to be hydrolysed before they are oxidised.
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Cuspake
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#5
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(Original post by Spelunker)
non-reducing sugars cannot act as a reducing agent becuase they dont have a free aldehyde group or ketone group. they have to be hydrolysed before they are oxidised.
Ohhhh
Thank you!
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David Hale
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#6
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#6
(Original post by Cuspake)
What's the difference between reducing and non--reducing sugars?
To test for a non-reducing sugar after a negative Benedict’s test:
-Add Acid
-Place in a water bath
-Add Alkali until no fizzing to ensure neutralised
-If Benedict’s test is then positive (Blue-Brick Red): Non-Reducing Sugar Present.
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Cuspake
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#7
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#7
(Original post by David Hale)
To test for a non-reducing sugar after a negative Benedict’s test:
-Add Acid
-Place in a water bath
-Add Alkali until no fizzing to ensure neutralised
-If Benedict’s test is then positive (Blue-Brick Red): Non-Reducing Sugar Present.
Thanks
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