4337. d-Galacturonic Acid

Nomenclature

CAS number: 685-73-4
C6H10O7; mol wt 194.14.
C 37.12%, H 5.19%, O 57.69%.

Description and references

Obtained by hydrolysis of pectin where it is present as polygalacturonic acid: Ehrlich, Chem. Ztg. 41, 197 (1917); Ehrlich, Guttmann, Biochem. Z. 259, 100 (1933); Ber. 66, 220 (1933); Niemann, Link, J. Biol. Chem. 95, 203 (1932); 104, 743 (1934); Morell, Link, ibid. 100, 385 (1933); Anderson, King, J. Chem. Soc. 1961, 5333. Isoln from mustard seeds: Goering, US 2987448 (1961 to Oil Seed Prod.).

Chemical structure

Derivative

α-Form.

Properties

Monohydrate, needles, mp 159°. [α]D20 +98.0° → +50.9° (water). Soluble in water; slightly sol in hot alcohol. Practically insol in ether.

Derivative

β-Form.

Properties

mp 166°. [α]D +27° → +55.6° (water).

Derivative

Phenylhydrazone.

Properties

mp 141°.