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| Copene | |
|---|---|
| Name | Copene |
| Chemical formula | C40H64 |
| Molar mass | 536.99 g·mol−1 |
| Appearance | orange-red crystalline solid |
| Density | 0.92 g·cm−3 |
| Melting point | 175–178 °C |
| Solubility | soluble in organic solvents |
Copene is a naturally occurring tetraterpene hydrocarbon belonging to the carotenoid family, noted for an extended conjugated polyene chain that confers intense pigmentation and red-orange coloration. It appears in various photosynthetic organisms and some fruits and vegetables, where it contributes to coloration and functions related to light interaction. Copene has been investigated across organic chemistry, plant biochemistry, nutrition science, and pharmacology for its structural features, biosynthetic origins, and potential bioactivity.
The trivial name "Copene" derives from nomenclatural traditions in natural product chemistry where the suffix -ene designates an unsaturated hydrocarbon; historical naming practices among organic chemists in the early 20th century produced analogous names such as lycopene and β-carotene. The terminology reflects a lineage of carotenoid nomenclature seen in publications from institutions like the Royal Society of Chemistry, American Chemical Society, and research conducted at laboratories affiliated with University of Cambridge, Harvard University, and Max Planck Society past studies.
Structurally, Copene is a C40 tetraterpene composed of eight isoprene units with a long polyene backbone characterized by alternating double and single bonds, producing a chromophore responsible for light absorption. Its geometry includes multiple conjugated trans and cis double bonds analogous to those in lycopene, β-carotene, and astaxanthin, while stereochemistry at specific double bonds influences isomerization behavior. Analytical characterization commonly employs nuclear magnetic resonance spectroscopy, mass spectrometry, ultraviolet–visible spectroscopy, and X-ray crystallography methodologies developed in labs at California Institute of Technology, ETH Zurich, and University of Oxford.
Copene has been reported in photosynthetic organisms including certain strains of Dunaliella salina and other microalgae, in some fruit tissues like varieties of Solanum lycopersicum (tomato) cultivars, and in chromoplast-rich tissues of plants studied by teams at Wageningen University, University of California, Davis, and INRAE. It is also detected in select fungi and bacterial taxa studied by researchers at Salk Institute and Broad Institute, where carotenoid pathways produce analogous hydrocarbons. Agricultural collections at USDA germplasm repositories and seed banks have been screened to map natural variation of carotenoid composition including Copene content.
The biosynthesis of Copene proceeds via the methylerythritol phosphate (MEP) pathway in plastids or the mevalonate pathway in some microorganisms, giving rise to geranylgeranyl pyrophosphate (GGPP) precursors catalyzed by prenyltransferases and carotenoid synthases related to enzymes characterized at Johns Hopkins University and University of Tokyo. Subsequent desaturation and cyclization reactions, mediated by desaturases and isomerases bearing homology to phytoene desaturase and ζ-carotene desaturase, yield the conjugated polyene of Copene. Metabolic turnover involves oxidative cleavage by carotenoid cleavage dioxygenases related to enzymes studied at Max Planck Institute for Molecular Plant Physiology and conjugation pathways mediated by UDP-glucosyltransferase homologs identified in rice and Arabidopsis research programs.
Copene exhibits strong absorption maxima in the visible region due to its extended conjugation, with spectroscopic signatures similar to pigments such as lycopene and canthaxanthin. It is lipophilic, with high solubility in nonpolar solvents like hexane, dichloromethane, and chloroform; it displays limited stability to heat, light, and oxygen, undergoing isomerization and oxidative cleavage to apocarotenoids. Thermal and photochemical behavior has been characterized in studies using differential scanning calorimetry and photostability assays conducted at National Physical Laboratory and NIST, revealing susceptibility to trans–cis isomerization and formation of epoxides under oxidative conditions.
Copene and Copene-containing extracts have been explored as natural colorants in food and cosmetic industries, with regulatory assessments by agencies such as European Food Safety Authority and Food and Drug Administration informing allowable applications. Research groups at Nestlé Research Center and Unilever have evaluated pigment incorporation for product formulation, while academic laboratories at Imperial College London and University of Milan have investigated antioxidant properties and photoprotective effects in model systems. In materials science, conjugated carotenoids including Copene have been probed for organic photovoltaic and semiconducting applications by teams at MIT and University of Cambridge.
Toxicological evaluation of Copene parallels assessments performed for related carotenoids by laboratories at National Institutes of Health and European Chemicals Agency, focusing on genotoxicity, subchronic toxicity, and bioavailability. Like other lipophilic carotenoids, high-dose exposure may influence fat-soluble nutrient interactions and has been monitored in clinical trials coordinated by institutions such as Mayo Clinic and Cleveland Clinic. Phototoxic and pro-oxidant effects under specific conditions have been observed in in vitro assays led by researchers at Karolinska Institutet and Monash University, informing safe use levels in formulations.
Category:Carotenoids