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What carbohydrate test would distinguish between fructose and glucose?

daTALLsmurf2

wrote...

Posts: 59

Rep:

11 years ago

What carbohydrate test would distinguish between fructose and glucose?

Name and describe the test and why should it be used.

Read 4351 times

1 Reply

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datageekgh

wrote...

#1

11 years ago

Seliwanoff?s test (resorcinol + HCl or H2SO4) distinguishes fructose from glucose. A positive test for fructose is a red precipitate.

You might think that Fehling's solution would distinguish an aldose from a ketose, but it doesn't work because under the conditions, fructose can rearrange to glucose, which is reduced.

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