Question #1e49b
1 Answer
Jan 30, 2016
There are many different possibilities.
Explanation:
A reducing sugar is any sugar that can act as a reducing agent because it has a free aldehyde group or a free ketone group.
Fructose is a reducing sugar because the open-chain form can isomerize to an aldehyde.
If it is part of a disaccharide, the hemiketal must not be involved in a glycoside linkage.
Here are three reducing disaccharides of glucose and fructose.
Turanose [α-D-glucopyranosyl-(1→3)-D-fructopyranose]
Maltulose [α-D-glucopyranosyl-(1→4)-D-fructofuranose]
Isomaltulose [α-D-glucopyranosyl-(1→6)-D-fructofuranose].
In each case, the hemiketal structure of fructose is retained, so these are all reducing disaccharides.
