Title: D-Galacturonic Acid
CAS Registry Number: 685-73-4
Molecular Formula: C6H10O7
Molecular Weight: 194.14
Percent Composition: C 37.12%, H 5.19%, O 57.69%
Literature 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.).
Derivative Type: a-Form
Properties: Monohydrate, needles, mp 159°. [a]D20 +98.0° ® +50.9° (water). Soluble in water; slightly sol in hot alcohol. Practically insol in ether.
Melting point: mp 159°
Optical Rotation: [a]D20 +98.0° ® +50.9° (water)
Derivative Type: b-Form
Properties: mp 166°. [a]D +27° ® +55.6° (water).
Melting point: mp 166°
Optical Rotation: [a]D +27° ® +55.6° (water)
Derivative Type: Phenylhydrazone
Properties: mp 141°.
Melting point: mp 141°
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