Phytoene

Phytoene
Names
IUPAC name
(6E,10E,14E,16Z,18E,22E,26E)-2,6,10,14,19,23,27,31-octamethyldotriaconta-2,6,10,14,16,18,22,26,30-nonaene
Other names
15-cis-Phytoene; 7,7',8,8',11,11',12,12'-Octahydro-ψ,ψ-carotene
Identifiers
13920-14-4 YesY
3D model (Jmol) Interactive image
ChEBI CHEBI:27787 N
ChemSpider 8138988 N
KEGG C05421 N
PubChem 9963391
UNII 876K2ZK1OF N
Properties
C40H64
Molar mass 544.95 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
Infobox references

Phytoene (FY-toe-een) is a 40-carbon intermediate in the biosynthesis of carotenoids.[1] The synthesis of phytoene is the first committed step in the synthesis of carotenoids in plants. Phytoene is produced from two molecules of geranylgeranyl pyrophosphate (GGPP) by the action of the enzyme phytoene synthase.[2] The two GGPP molecules are condensed together followed by removal of diphosphate and proton shift leading to the formation of phytoene.

Dietary phytoene and phytofluene are found in a number of human tissues including the liver, lung, breast, prostate, colon, and skin.[3] Accumulation of these carotenoids in the skin may protect the skin by several mechanisms: acting as UV absorbers, as antioxidants, and as anti-inflammatory agents.[4][5]

Structure

Phytoene is a symmetric molecule containing three conjugated double bonds. Phytoene has a UV-Vis absorption spectrum typical for a triply conjugated system with its main absorption maximum in the UVB range at 286 nm and with ε1% of 915.

Sources

Analysis of several fruits and vegetables showed that phytoene and phytofluene are found in majority of fruits and vegetables.[6] In contrast to all other carotenoids, phytoene and phytofluene, the first carotenoid precursors in the biosynthetic pathway of other carotenoids absorb light in the UV range.

History

The structure of phytoene was established and proven by total synthesis, by the Basil Weedon group in 1966.[7]

References

  1. Carotenoid Biosynthesis
  2. Phytoene synthase
  3. Khachik F, Carvalho L, Bernstein PS, Muir GJ, Zhao DY, Katz NB. Chemistry, distribution, and metabolism of tomato carotenoids and their impact on human health. Experimental biology and medicine. 2002;227:845-51.
  4. Aust, W. Stahl, H. Sies, H. Tronnier, U. Heinrich (2005). "Supplementation with tomato-based products increases lycopene, phytofluene, and phytoene levels in human serum and protects against UV-light-induced erythema". Int J Vitam Nutr Res. 75 (1): 54–60. doi:10.1024/0300-9831.75.1.54. PMID 15830922.
  5. B. B. Fuller; D. R. Smith; A. J. Howerton; D. Kern (2006). "Anti-inflammatory effects of CoQ10 and colorless carotenoids". J. Cos. Derm. 5 (1): 30–38. doi:10.1111/j.1473-2165.2006.00220.x. PMID 17173569.
  6. Khachik, F., G.R. Beecher, M.B. Goli, and W.R. Lusby (1991). "Separation, identifi cation, and quantification of carotenoids in fruits, vegetables and human plasma by high performance liquid chromatography". Pure & App. Chemistry. 63 (1): 71–80. doi:10.1351/pac199163010071.
  7. J. B. Davis; L. M. Jackman; P. T. Siddons; B. C. L. Weedon (1966). "Carotenoids and related compounds. XV. The structure and synthesis of phytoene, phytofluene, zeta-carotene, and neurosporene". J. Chem. Soc. C: 2154–2165.

7. Book chapter: Liki von Oppen-Bezalel, Aviv Shaish. Application of the Colorless Carotenoids, Phytoene, and Phytofluene in Cosmetics, Wellness, Nutrition, and Therapeutics. In The alga Dunaliella: Biodiversity, Physiology, Genomics & Biotechnology. Eds. Ami Ben-Amotz, Juergen Polle, and Subba Rao, released May 2009 by Science Publishers, Enfield, NH, USA (2009)

This article is issued from Wikipedia - version of the 6/5/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.