Galacturonsäure

Strukturformel
Struktur von Galacturonsäure
Fischer-Projektion, offenkettige Darstellung
Allgemeines
Name Galacturonsäure
Andere Namen
  • Galakturonsäure
  • 6-Carboxy-D-galactose
  • D-Galacturonsäure
  • (2S,3R,4S,5R)-2,3,4,5-Tetrahydroxy-6-oxo-hexansäure
  • Botrytissäure (nach ihrem Vorkommen in edelsüßen Weinen)
  • GalA (biochemische Abkürzung)
  • D-Galacturonic acid (SNFG-Symbol)
Summenformel C6H10O7
Externe Identifikatoren/Datenbanken
CAS-Nummer
EG-Nummer 239-061-5
ECHA-InfoCard 100.035.495
PubChem 84740
ChemSpider 76444
Wikidata Q422729
Eigenschaften
Molare Masse 194,14 g·mol−1
Aggregatzustand

fest (Monohydrat)[1]

Schmelzpunkt

166 °C (Monohydrat)[2]

Löslichkeit

löslich in Wasser und Ethanol, unlöslich in Diethylether[2]

Sicherheitshinweise
GHS-Gefahrstoffkennzeichnung[1]

Monohydrat

keine GHS-Piktogramme

H- und P-Sätze H: keine H-Sätze
P: keine P-Sätze
Soweit möglich und gebräuchlich, werden SI-Einheiten verwendet.
Wenn nicht anders vermerkt, gelten die angegebenen Daten bei Standardbedingungen (0 °C, 1000 hPa).

Galacturonsäure, kurz GalA, ist eine organisch-chemische Verbindung aus der Gruppe der Uronsäuren. Sie kommt natürlicherweise in Form der D-Galacturonsäure insb. als Hauptbestandteil von Pektinen (was zuerst 1924 von K. Smolenski vermutet wurde[3]) vor und gehört zu den Ballaststoffen. Formal kann die D-Galacturonsäure als eine oxidierte Form der D-Galactose aufgefasst werden. Salze der Galacturonsäure werden als Galacturonate bezeichnet.

Siehe auch

Einzelnachweise

  1. a b Datenblatt D-(+)-Galacturonic acid monohydrate, ≥97.0% bei Sigma-Aldrich, abgerufen am 13. Mai 2017 (PDF).
  2. a b David R. Lide (Hrsg.): CRC Handbook of Chemistry and Physics. 90. Auflage. (Internet-Version: 2010), CRC Press / Taylor and Francis, Boca Raton FL, Physical Constants of Organic Compounds, S. 3-266.
  3. herbstreith-fox.de: Pektin - das Naturprodukt (Memento vom 8. November 2007 im Internet Archive) (PDF; 621 kB).

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