MadSci Network: Biochemistry
Query:

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

Date: Tue Sep 30 08:42:17 1997
Posted by Susan Herzog
Grade level: 7-9
School: The Mott Hall School - IS 223
City: New York State/Province: NY
Country: US
Area of science: Biochemistry
ID: 875626937.Bc
Message:
I am a 7th grade life science teacher.  As part of our unit on 
biological molecules, we use some chemcial indicators to test for the 
presence of protein, simple sugar and carbohydrates.  We use iodine or 
Lugol's solution for starches and Benedict's heated to identify the 
presence of simple sugars.  My student's and I are flumoxed when not 
one sample of table sugar we tried tested positive with either the 
Lugol's or Benedict's.  I've asked around and nobody has been able to 
explain this to us.  Can you guys help?

Best Regards,
Susan 


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

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