Ribulose

• 488-84-6 (D - shape )
• 2042-27-5 ( L-form)
• 5556-48-9 ( mixture )

Template: Infobox chemical / molecular formula search available

Ribulose is a simple sugar ( monosaccharide ) from the group of carbohydrates. Since it has five carbon atoms, the ribulose is one of the pentose, it is also due to their keto ketosis.

All pentoses have the molecular formula C5H10O5. Most monosaccharides can both open-chain, as present in ring shape. Due to the chirality of the molecule are two different stereoisomers ( D-and L -ribulose ). Ribose and arabinose as aldopentoses related to the ketopentose ribulose in tautomeric equilibrium.

Occurrence

D -ribulose occurs naturally in all plants as a metabolic product before. As it is a common bacteria in Stoffwechselintermediat (as ribulose -5-phosphate ).

Production

D -ribulose can be obtained by epimerization of D- arabinose in pyridine. Ribulose can not be prepared in crystalline form and is sold as a syrup.

Biological Significance

Ribulose is an important compound in the Calvin cycle, is assimilated by the CO2 to glucose. For this so-called dark reaction of photosynthesis obtained from the light reaction energy is being used. In the Calvin cycle, it is a D- ribulose -1 ,5- bisphosphate, the initial molecule is combined with carbon dioxide.