Tests of Glucose
Tests of Glucose
Molisch’s test: This is a general test for carbohydrates. Two or three drops of alcoholic solution of a-naphthol is added to 2mL of glucose solution. 1 mL of concentrated H2SO4 is added carefully along the sides of the test tube. The formation of a violet ring, at the junction of two liquids confirms the presence of a carbohydrate.
Silver mirror test: A mixture of glucose and ammonical silver nitrate is warmed in a test tube. Appearance of silver mirror on the inner walls confirms glucose.
Fehling’s solution test: A little glucose is warmed with Fehling’s solution. A red precipitate of cuprous oxide is formed.
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