MadSci Network: Biochemistry
Query:

Re: Why doesn't a solution of granulated sugar heated with Benedict's turn red?

Area: Biochemistry
Posted By: Lynn Bry, MadSci Admin
Date: Tue Sep 30 20:21:55 1997
Area of science: Biochemistry
ID: 875626937.Bc
Message:

Dear Susan,

A number of simple tests can be used to test for the presence of carbohydrates. Benedict's solution is used to test for the presence of reducing sugars such as glucose, fructose, maltose or galactose, while Lugol's Iodine tests for the presence of starch, a complex polysaccharide. Granulated sugar contains mostly sucrose, a disaccharide consisting of glucose connected to fructose. Benedict's solution does not react with sucrose because it is not a reducing sugar.

-L. Bry, MadSci Admin

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