what is D and L represent in the glucose formula.

Asked by  | 4th Jul, 2008, 07:31: PM

Expert Answer:

Aldohexose sugars have 4 chiral centers giving 24 = 16 stereoisomers. These are split into two groups, L and D, with 8 sugars in each. Glucose is one of these sugars, and L-glucose and D-glucose are two of the stereoisomers. Only 7 of these are found in living organisms, of which D-glucose (Glu), D-galactose (Gal), and D-mannose (Man) are the most important. These eight isomers (including glucose itself) are related as diastereoisomers and belong to the D series.

Two stereoisomers of the aldohexose sugars are known as glucose, only one of which (D-glucose) is biologically active. This form (D-glucose) is often referred to as dextrose monohydrate, or, especially in the food industry, simply dextrose (from dextrorotatory glucose[1]). This article deals with the D-form of glucose. The mirror-image of the molecule, L-glucose, cannot be metabolized by cells in the biochemical process known as glycolysis.

Answered by  | 4th Jul, 2008, 10:24: PM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.