Question

What are the differences in the Fischer projections of D-glucose and D-fructose? (13.3)

Short answer

D-Glucose and D-fructose are isomers of commonly consumed monosaccharides. The ratio of conversion of D-glucose to D-fructose by glucose isomerase (xylose isomerase) is not more than 50 %.

Step-by-step solution

introduction

• Both monosaccharides are aldohexoses.
• The two monosaccharides differ in the configuration around the fourth carbon atom.

Differences in the Fischer projections of D-glucose and D-fructose 

• Both D-Fructose and D-glucose are a ketohexose, D-glucose has aldehyde on C one while D-fructose has alcohol at $C$one. D-glucose has alcohol at $C$two while $\mathrm{D}$-fructose has ketone at C two