Arabinose

Arabinose
Names
	IUPAC name Arabinose
	Other names Pectinose
Identifiers
CAS Number	147-81-9 ; 10323-20-3 (D) ; 5328-37-0 (L) ;
3D model (JSmol)	Interactive image; Interactive image;
ChEBI	CHEBI:46983 ;
ChemSpider	59687 ;
EC Number	205-699-8;
PubChem CID	5460291;
UNII	509X20752R ; F0W6ETZ4E5 (D) ; B40ROO395Z (L) ;
	InChI InChI=1S/C5H10O5/c6-1-3(8)5(10)4(9)2-7/h1,3-5,7-10H,2H2/t3-,4-,5+/m1/s1 Key: PYMYPHUHKUWMLA-WDCZJNDASA-N ; InChI=1/C5H10O5/c6-1-3(8)5(10)4(9)2-7/h1,3-5,7-10H,2H2/t3-,4-,5+/m1/s1 Key: PYMYPHUHKUWMLA-WDCZJNDABW;
	SMILES O=C[C@@H](O)[C@H](O)[C@H](O)CO; C([C@H]([C@H]([C@@H](C=O)O)O)O)O;
Properties
Chemical formula	C5H10O5
Molar mass	150.13 g/mol
Appearance	Colorless crystals as prisms or needles
Density	1.585 g/cm3 (20 °C)
Melting point	164 to 165 °C (327 to 329 °F; 437 to 438 K)
Solubility in water	834 g/1 L (25 °C (77 °F))
Magnetic susceptibility (χ)	-85.70·10−6 cm3/mol
Hazards
NFPA 704 (fire diamond)	1 1 0
Related compounds
Related aldopentoses	Ribose; Xylose; Lyxose
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Arabinose is an aldopentose – a monosaccharide containing five carbon atoms, and including an aldehyde (CHO) functional group.

Properties

For biosynthetic reasons, most saccharides are almost always more abundant in nature as the "D"-form, or structurally analogous to D-glyceraldehyde.^{[note 1]} However, L-arabinose is in fact more common than D-arabinose in nature and is found in nature as a component of biopolymers such as hemicellulose and pectin.^[2]

The L-arabinose operon, also known as the araBAD operon, has been the subject of much biomolecular research. The operon directs the catabolism of arabinose in E. coli, and it is dynamically activated in the presence of arabinose and the absence of glucose.^[3]

A classic method for the organic synthesis of arabinose from glucose is the Wohl degradation.^[4]

D-Arabinose
α-D-Arabinofuranose	β-D-Arabinofuranose
α-D-Arabinopyranose	β-D-Arabinopyranose

Etymology

Arabinose gets its name from gum arabic, from which it was first isolated.^[5]

Use in foods

Originally commercialized as a sweetener, arabinose is an inhibitor of sucrase, the enzyme that breaks down sucrose into glucose and fructose in the small intestine.^[6]

Notes

^ The D/L nomenclature does not refer to the molecule's optical rotation properties but to its structural analogy to glyceraldehyde.

References

^ Weast, Robert C., ed. (1981). CRC Handbook of Chemistry and Physics (62nd ed.). Boca Raton, FL: CRC Press. p. C-110. ISBN 0-8493-0462-8.
^ Holtzapple, M.T. (2003). "HEMICELLULOSES". Encyclopedia of Food Sciences and Nutrition (2nd edition): 3060–3071. doi:10.1016/B0-12-227055-X/00589-7. ISBN 9780122270550.
^ Watson, James (2003). Molecular Biology of the Gene. p. 503.
^ Braun, Géza (1940). "D-Arabinose". Organic Syntheses. 20: 14; Collected Volumes, vol. 3, p. 101.
^ Merriam Webster Dictionary
^ Krog-Mikkelsen, Inger; Hels, Ole; Tetens, Inge; Holst, Jens Juul; Andersen, Jens Rikardt; Bukhave, Klaus (2011-08-01). "The effects of L-arabinose on intestinal sucrase activity: dose-response studies in vitro and in humans". The American Journal of Clinical Nutrition. 94 (2): 472–478. doi:10.3945/ajcn.111.014225. ISSN 1938-3207. PMID 21677059.

[2] The D/L nomenclature does not refer to the molecule's optical rotation properties but to its structural analogy to glyceraldehyde.

[1] Weast, Robert C., ed. (1981). CRC Handbook of Chemistry and Physics (62nd ed.). Boca Raton, FL: CRC Press. p. C-110. ISBN 0-8493-0462-8.

[3] Holtzapple, M.T. (2003). "HEMICELLULOSES". Encyclopedia of Food Sciences and Nutrition (2nd edition): 3060–3071. doi:10.1016/B0-12-227055-X/00589-7. ISBN 9780122270550.

[4] Watson, James (2003). Molecular Biology of the Gene. p. 503.

[5] Braun, Géza (1940). "D-Arabinose". Organic Syntheses. 20: 14; Collected Volumes, vol. 3, p. 101.

[6] Merriam Webster Dictionary

[:0-7] Krog-Mikkelsen, Inger; Hels, Ole; Tetens, Inge; Holst, Jens Juul; Andersen, Jens Rikardt; Bukhave, Klaus (2011-08-01). "The effects of L-arabinose on intestinal sucrase activity: dose-response studies in vitro and in humans". The American Journal of Clinical Nutrition. 94 (2): 472–478. doi:10.3945/ajcn.111.014225. ISSN 1938-3207. PMID 21677059.

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