Squalane

Squalane is a hydrocarbon derived by hydrogenation of squalene. In contrast to squalene, due to the complete saturation of squalane, it is not subject to auto-oxidation. This fact, coupled with lower costs associated with squalane, make it desirable in cosmetics manufacturing, where it is used as an emollient and moisturizer.[3] The hydrogenation of squalene to produce squalane was first reported in 1916.[4][5]

Not to be confused with squalene.
Squalane
Names
IUPAC name
2,6,10,15,19,23-Hexamethyltetracosane[1]
Other names
Perhydrosqualene; Dodecahydrosqualene
Identifiers
3D model (JSmol)
776019
ChemSpider
ECHA InfoCard 100.003.478
EC Number
  • 203-825-6
KEGG
MeSH squalane
RTECS number
  • XB6070000
UNII
Properties
C30H62
Molar mass 422.826 g·mol−1
Appearance Colorless liquid
Odor Odorless
Density 810 mg/mL
Melting point −38 °C (−36 °F; 235 K)
Boiling point 176 °C (349 °F; 449 K) at 7 Pa
1.452
Viscosity 31.123 mPa·s[2]
Thermochemistry
886.36 J/(K·mol)
−871.1...−858.3 kJ/mol
−19.8062...−19.7964 MJ/mol
Hazards
GHS pictograms
GHS Signal word Warning
H315, H319, H335
P261, P305+351+338
Flash point 218 °C (424 °F; 491 K)
Related compounds
Related alkanes
 Phytane
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

In basic research, squalane is used as a reference liquid in tribology.[6][7]

Source and production

Squalene was traditionally sourced from the livers of sharks, with approximately 3000 required to produce one ton of squalane.[5] Due to environmental concerns, other sources such as olive oil, rice and sugar cane have been commercialized, and as of 2014 have been supplying about 40% of the industry total.[5] In manufacturing, farnesene is produced from fermentation of sugarcane sugars using genetically modified Saccharomyces cerevisiae yeast strains.[5] Farnesene is then dimerized to isosqualene and then hydrogenated to squalane.[5][8]

Cosmetics use

Squalane was introduced as an emollient in the 1950s.[5] The unsaturated form squalene is produced in human sebum and the livers of sharks.[9][10] Squalane has low acute toxicity and is not a significant human skin irritant or sensitizer.[11][12]

References
  1. "Squalane - Compound Summary". PubChem Compound. USA: National Center for Biotechnology Information. 26 March 2005. Identification and Related Records. Retrieved 15 March 2012.
  2. Lal, Krishan; Tripathi, Neelima; Dubey, Gyan P. (2000). "Densities, Viscosities, and Refractive Indices of Binary Liquid Mixtures of Hexane, Decane, Hexadecane, and Squalane with Benzene at 298.15 K". Journal of Chemical & Engineering Data. 45 (5): 961–964. doi:10.1021/je000103x. ISSN 0021-9568.
  3. Rosenthal, Maurice L. (2002). "Squalane: the natural moisturizer". In Schlossman, Mitchell L. (ed.). Chemistry and Manufacture of Cosmetics. 3 (Bk. 2) (3rd ed.). pp. 869–875.
  4. Tsujimoto, M. (1916). "A highly unsaturated hydrocarbon in shark liver oil". Ind. Eng. Chem. 8 (10): 889–896. doi:10.1021/i500010a005.
  5. Ciriminna, Rosaria; Pandarus, Valerica; Béland, François; Pagliaro, Mario (2014). "Catalytic Hydrogenation of Squalene to Squalane". Organic Process Research & Development. 18 (9): 1110–1115. doi:10.1021/op5002337.
  6. Bair, Scott (2006). "Reference liquids for quantitative elastohydrodynamics: selection and rheological characterization". Tribology Letters. 22 (2): 197–206. doi:10.1007/s11249-006-9083-y. ISSN 1023-8883. S2CID 137651135.
  7. Hecksher, Tina; Olsen, Niels Boye; Dyre, Jeppe C. (2017). "Model for the alpha and beta shear-mechanical properties of supercooled liquids and its comparison to squalane data". The Journal of Chemical Physics. 146 (15): 154504. arXiv:1701.05086. doi:10.1063/1.4979658. ISSN 0021-9606. PMID 28433033. S2CID 24743379.
  8. McPhee D, Pin A, Kizer L, Perelman L (2014). "Deriving Renewable Squalane from Sugarcane" (PDF). Cosmetics & Toiletries. 129 (6).
  9. Pappas, A (2009). "Epidermal surface lipids". Dermato-endocrinology. 1 (2): 72–76. doi:10.4161/derm.1.2.7811. PMC 2835894. PMID 20224687.
  10. Allison, Anthony C. (1999). "Squalene and Squalane Emulsions as Adjuvants". Methods. 19 (1): 87–93. doi:10.1006/meth.1999.0832. PMID 10525443.
  11. "Final Report on the Safety Assessment of Squalane and Squalene". International Journal of Toxicology. 1 (2): 37–56. 1982. doi:10.3109/10915818209013146. S2CID 31454284.
  12. "Final Report on the Safety Assessment of Squalane and Squalene" (PDF). International Journal of Toxicology. 1 (2): 37–56. 1982. doi:10.3109/10915818209013146. S2CID 31454284.
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