Rhodoxanthin

Rhodoxanthin^[1]

IUPAC name (4E)-3,5,5-Trimethyl-4-[(2E,4E,6E,8E,10E,12E,14E,16E,18E)-3,7,12,16-Tetramethyl-18-(2,6,6-trimethyl-4-oxo-1-cyclohex-2-enylidene)octadeca-2,4,6,8,10,12,14,16-octaenylidene]-1-cyclohex-2-enone
Other names •4',5'-Didehydro-retro-β-carotene-3,3'-dione •E161f
Identifiers
CAS number	116-30-3^Y
PubChem	5281251
Jmol-3D images	Image 1
SMILES CC1=CC(=O)CC(C1=CC=C(C)C=CC=C(C)C=CC=CC(=CC=CC(=CC=C2C(=CC(=O)CC2(C)C)C)C)C)(C)C
Properties
Molecular formula	C₄₀H₅₀O₂
Molar mass	562.82 g/mol
Appearance	Purple crystals
Melting point	219 °C
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Rhodoxanthin is a xanthophyll pigment with a purple color that is found in small quantities in a variety plants including Taxus baccata. It is also found in the feathers of some birds.^[1] As a food additive it is used under the E number E161f as a food coloring; it is not approved for use in the EU^[2] or USA however is approved in Australia and New Zealand^[3] (where it is listed under its INS number 161f).

References

^ ^a ^b Merck Index, 11th Edition, 8196.
^ UK Food Standards Agency: "Current EU approved additives and their E Numbers". http://www.food.gov.uk/safereating/chemsafe/additivesbranch/enumberlist. Retrieved 2011-10-27.
^ Australia New Zealand Food Standards Code"Standard 1.2.4 - Labelling of ingredients". http://www.comlaw.gov.au/Details/F2011C00827. Retrieved 2011-10-27.