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Fehling test is only suitable for reducing sugars, that means, monosaccharides in its open form with an aldehyd available. Polysacchardes have the aldehydes in a acetal form and they can not react

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13y ago
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12y ago

because there is only one reducing group for every 2000 to 10000 monosaccharidee units

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9y ago

Monosaccharides are tested with the help of Fehling's solution and give a positive result. Amylose is made up of polysaccharides and hence gives a negative test with the Fehling's solution.

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Q: Why dont polysaccharides give a positive test with Fehling's solution?
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