Title: g-Carotene
CAS Registry Number: 472-93-5
Molecular Formula: C40H56
Molecular Weight: 536.87
Percent Composition: C 89.49%, H 10.51%
Literature References: A rare carotenoid. Has provitamin A activity. Best source is Penicillium sclerotiorum: Mase et al., Arch. Biochem. Biophys. 68, 150 (1957). Also present in small proportions in many plant materials, esp fruits containing b-carotene. Chromatographic isoln from crude carotenes: Kuhn, Brockmann, Ber. 66, 407 (1933); Winterstein, Z. Physiol. Chem. 219, 249 (1933). Structure: Kuhn, Brockmann, loc. cit.; Naturwissenschaften 21, 44 (1933). Synthesis: Garbers et al., Helv. Chim. Acta 36, 1783 (1953); Ruegg et al., ibid. 44, 985 (1961).
Properties: Probably crystallizes in polymorphous forms. Synthetic form: red plates, mp 152-153.5°. Absorption max (petr ether): 437, 462, 494 nm (E1%1cm 2055, 3100, 2720). Natural form: minute, deep-red prisms with bluish luster from benzene + methanol. mp 177.5°. Absorption max (chloroform): 508.5, 475, 446 nm. Somewhat less sol than b-carotene. Store in darkness in sealed ampoules at low temps (0°C).
Melting point: mp 152-153.5°; mp 177.5°
Absorption maximum: Absorption max (petr ether): 437, 462, 494 nm (E1%1cm 2055, 3100, 2720); Absorption max (chloroform): 508.5, 475, 446 nm
Therap-Cat: Vitamin A precursor.
Therap-Cat-Vet: Vitamin A precursor for all species except cats.
Keywords: Vitamin/Vitamin Source; Vitamin A. |