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Description:In this 1965 image, a laboratory technician was checking for the presence of a color change in a test using the Benedict method.
The Benedict test is used to identify the presence of reducing sugars. Reducing sugars such as glucose and fructose possess free aldehyde or ketone groups, which when they combine with the blue copper(II) ions (Cu2+), they reduce the ions to red copper(I) ions (Cu+). Sucrose, not being a reducing sugar, possesses no such groups, and therefore, the Benedicts solution remains blue.
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Content Providers(s):CDC/ Ms. McDaniel
Creation Date:1965
Photo Credit:
CDC Organization
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Copyright Restrictions:None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.