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What are non reducing sugars and how can we test for them?

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A nonreducing sugar is a carbohydrate that is not oxidized by a weak oxidizing agent (an oxidizing agent that oxidizes aldehydes but not alcohols, such as the Tollen's reagent) in basic aqueous solution.it can be tested using 

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Benedict's test is used to determine if the sugar sample is non – reducing or reducing in nature. If Benedict's solution is added to the sugar sample and we see no change in the color, then the sugar sample is non-reducing. And If we see a change in the color of the sugar sample, then it is reducing.
Blue: No non – reducing sugars present
Green: Traces of non – reducing sugars present
Orange: Moderate amount of reducing sugars ...


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