Title: Rubixanthin
CAS Registry Number: 3763-55-1
CAS Name: (3R)-b,y-Caroten-3-ol
Molecular Formula: C40H56O
Molecular Weight: 552.87
Percent Composition: C 86.90%, H 10.21%, O 2.89%
Literature References: Carotenoid isomeric with cryptoxanthin. Isolated from hipberries (rose hips, Rosa rubiginosa L., Rosaceae): Kuhn, Grundmann, Ber. 67, 339, 1133 (1934); from the flowers of Tagetes patula L., Compositae. Found also in other Rosa varieties. Structural studies: Brown, Weedon, Chem. Commun. 1968, 382. Abs config: L. Bartlett et al., J. Chem. Soc. C 1969, 2527. Biosynthesis studies: McDermott et al., Biochem. J. 134, 1115 (1973). Has no vitamin A activity.
Properties: Deep red needles with metallic luster from benzene + methanol. Orange crystals from benzene + petr ether, mp 160°. Absorption max (chloroform): 509, 474, 439 nm. Sol in benzene, chloroform; slightly sol in petr ether, alcohol.
Melting point: mp 160°
Absorption maximum: Absorption max (chloroform): 509, 474, 439 nm
Ruboxistaurin Rubus Rufigallol Rufinamide Rufloxacin

CAS number 3763-55-1 YesY
PubChem 5281252
Jmol-3D images Image 1
Molecular formula C40H56O
Molar mass 552.85 g/mol
Appearance Red-orange crystals
Melting point 160 °C
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Rubixanthin, or natural yellow 27, is a natural xanthophyll pigment with a red-orange color found in rose hips. As a food additive it used under the E number E161d as a food coloring; it is not approved for use in the USA[citation needed] or EU[2] but is approved in Australia and New Zealand[3] where it is listed as 161d.