Ribulose

Structural formula
	Fischer projection , open-chain representation
General
Surname	Ribulose
other names	1,3,4,5-tetrahydroxypentan-2-one ( IUPAC ); Adonose; Erythro-2-pentulose;
Molecular formula	C 5 H 10 O 5
Brief description	colorless to yellowish viscous liquid
External identifiers / databases
EC number	207-687-8
ECHA InfoCard	100.006.989
PubChem	151261
Wikidata	Q57830363
properties
Molar mass	150.13 g · mol -1
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Ribulose is a simple sugar (monosaccharide) from the group of carbohydrates . Since it has five carbon atoms, ribulose is a pentose , and because of its keto group it is also a ketosis .

Occurrence

D- ribulose occurs naturally in all plants as a metabolic product. It is also a common metabolic intermediate in bacteria (as ribulose-5-phosphate ).

Manufacturing

D- ribulose can be obtained from D - arabinose in pyridine by epimerization .

properties

All pentoses have the empirical formula C ₅ H ₁₀ O ₅ . Most monosaccharides can be both open-chain and ring-shaped. Because of the chirality of the molecule, there are two different stereoisomers ( D - and L -ribulose). Ribose and arabinose as aldopentoses are in tautomeric equilibrium with the ketopentose ribulose .

D -Ribulosis - spellings
Wedge formula	Haworth notation
	α- D -ribulofuranose	β- D -ribulofuranose

Biological importance

Ribulose is an important compound in the Calvin cycle , through which CO _{2 is} assimilated to glucose . For this so-called dark reaction of photosynthesis , energy gained from the light reaction is used. In the Calvin cycle, as D - ribulose-1,5-bisphosphate, it is the initial molecule that combines with carbon dioxide .

Individual evidence

↑ Entry on d-ribulose. In: Römpp Online . Georg Thieme Verlag, accessed on May 1, 2016.
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

Web links

Commons : Ribulose - collection of images, videos and audio files

[1] Entry on d-ribulose. In: Römpp Online . Georg Thieme Verlag, accessed on May 1, 2016.

[NV-2] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.