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identifying reducing sugars. help

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identifying reducing sugars. help

Postby Simmy » Tue Nov 08, 2005 12:56 am

i just did a lab in biology to identify Reducing Sugars. as a result Sucrose was not a identified by this lad.

can any one explain to me why Sucrose was not identified by the reducing sugars lab?????

Is sucrose not a reducing sugar?????
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Postby Navin » Tue Nov 08, 2005 2:35 am

Yes, sucrose is not a reducing sugar and therefore cannot be identified by benedict's test for reducing sugars.
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Postby MrMistery » Tue Nov 08, 2005 9:02 pm

Occam's raiser: the simplest explanation is often the right one
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Re: identifying reducing sugars. help

Postby sdekivit » Tue Nov 08, 2005 9:29 pm

Simmy wrote:i just did a lab in biology to identify Reducing Sugars. as a result Sucrose was not a identified by this lad.

can any one explain to me why Sucrose was not identified by the reducing sugars lab?????

Is sucrose not a reducing sugar?????


fructose doesn't contain a so called hemi-acetal group and has therefore no reducing power.

compare with for example glucose, it contains a O - CHOH-group at the anomer C-atom (C1), which is in equilibrium with the open chain form. The open chainform is an aldehyde group that can reduce compunds and is thereby converted to a carboxylgroup.

--> the open chain form of fructose is a ketone-group that hasn't got reducing power (only oxidizing)
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