Galacturonic acid

from Wikipedia, the free encyclopedia
Structural formula
Structure of galacturonic acid
Fischer projection , open-chain representation
General
Surname Galacturonic acid
other names
  • Galacturonic acid
  • 6-carboxy- D- galactose
  • D- galacturonic acid
  • ( 2S, 3R, 4S, 5R ) -2,3,4,5-tetrahydroxy-6-oxo-hexanoic acid
  • Botrytis acid (after its occurrence in noble sweet wines)
  • GalA (biochemical abbreviation)
Molecular formula C 6 H 10 O 7
External identifiers / databases
CAS number
  • 14982-50-4 (unspec.)
  • 685-73-4 [ D- galactopyranuronic acid]
  • 91510-62-2 [ D - (+) - galacturonic acid monohydrate ]
EC number 239-061-5
ECHA InfoCard 100,035,495
PubChem 84740
ChemSpider 76444
Wikidata Q422729
properties
Molar mass 194.14 g mol −1
Physical state

solid (monohydrate)

Melting point

166 ° C (monohydrate)

solubility

soluble in water and ethanol , insoluble in diethyl ether

safety instructions
GHS labeling of hazardous substances

Monohydrate

no GHS pictograms
H and P phrases H: no H-phrases
P: no P-phrases
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Galacturonic acid , or GalA for short , is an organic-chemical compound from the group of uronic acids . It occurs naturally in the form of D- galacturonic acid, especially as the main component of pectins (which was first suspected by K. Smolenski in 1924) and is one of the dietary fibers . Formally, D- galacturonic acid can be regarded as an oxidized form of D- galactose . Galacturonic acid salts are known as galacturonates.

  • α- D- galacturonic acid in Haworth notation

  • β- D- galacturonic acid in Haworth notation

See also

Web links

  • Ion chromatographic determination of galacturonic acid in wine: Joachim Weiss: Ion chromatography . John Wiley & Sons, 2012, ISBN 3-527-66080-1 ( limited preview in Google Book Search).

Individual evidence

  1. ↑ a b Data sheet D - (+) - Galacturonic acid monohydrate, ≥97.0% from Sigma-Aldrich , accessed on May 13, 2017 ( PDF ).
  2. ↑ a b David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Physical Constants of Organic Compounds, pp. 3-266.
  3. ↑ Herbstreith-fox.de: Pectin - the natural product (PDF; 621 kB).