NUTRITION
CARBOHYDRATES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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This test will give blue green colored complex as the positive result for the presence of pentoses.
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Bial’s orcinol test
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Fehling’s Test
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Seliwanoff’s Test
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Barfoed Test
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Explanation:
Detailed explanation-1: -Bial’s test is useful in distinguishing pentoses sugar from hexoses sugars. Pentosses ( such as ribose sugar) form furfural in acidic medium which condense with orcinol in presence of ferric ion to give blue green colored complex which is soluble in butyl alcohol.
Detailed explanation-2: -Keep both tubes in boiling water bath for one minutes and allow the tubes to cool down to room temperature. 5. Observe the appearance of blue-green color for ribose, and brown color for glucose.
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