Rubixanthin

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 or EU[2] but is approved in Australia and New Zealand[3] where it is listed as 161d.

Rubixanthin[1]
Names
IUPAC name
(3R)-β,ψ-Caroten-3-ol
Systematic IUPAC name
(1R)-4-[(1E,3E,5E,7E,9E,11E,13E,15E,17E,19E)-3,7,12,16,20,24-Hexamethylpentacosa-1,3,5,7,9,11,13,15,17,19,23-undecaen-1-yl]-3,5,5-trimethylcyclohex-3-en-1-ol
Other names
  • Natural yellow 27
  • E161d
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.292.282
E number E161d (colours)
UNII
  • InChI=1S/C40H56O/c1-31(2)17-13-20-34(5)23-15-25-35(6)24-14-21-32(3)18-11-12-19-33(4)22-16-26-36(7)27-28-39-37(8)29-38(41)30-40(39,9)10/h11-12,14-19,21-28,38,41H,13,20,29-30H2,1-10H3/b12-11+,21-14+,22-16+,25-15+,28-27+,32-18+,33-19+,34-23+,35-24+,36-26+/t38-/m1/s1 ☒N
    Key: ABTRFGSPYXCGMR-AXXBKCDFSA-N ☒N
  • CC1=C(C(C[C@@H](C1)O)(C)C)\C=C\C(=C\C=C\C(=C\C=C\C=C(/C)\C=C\C=C(/C)\C=C\C=C(/C)\CCC=C(C)C)\C)\C
Properties
C40H56O
Molar mass 552.85 g/mol
Appearance Red-orange crystals
Melting point 160 °C (320 °F; 433 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

References
  1. Merck Index, 11th Edition, 8265.
  2. UK Food Standards Agency: "Current EU approved additives and their E Numbers". Retrieved 2011-10-27.
  3. Australia New Zealand Food Standards Code"Standard 1.2.4 - Labelling of ingredients". Retrieved 2011-10-27.
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