Emollients are essential ingredients in all types of skin care products. The selection of the emollient phase will determine skin feel, moisturization capacity, and stability of the formulation. Emollients can be classified according to their chemical composition or by their physicochemical properties. The basic building blocks of most emollients are long chain hydrocarbons, often combined with alcohols and acids in the form of esters. The raw materials are derived from petrochemical or natural sources, such as vegetable oils and fats.
By varying the molecular structures and the composition of the emollients, properties such as rheology and polarity can be adjusted to meet the requirements on moisturization, sensory properties, and delivery of actives. The rheological properties of the emollient can influence the lubricity and spreading properties of the formulation. The polarity of the emollient is linked to the delivery of actives and to the interaction between the formulation and skin.
When selecting emollients for a formulation, the stability in terms of hydrolysis and oxidation must be considered. Esters can be hydrolyzed to the corresponding alcohol and acid if the formulation is too acidic or alkaline. Oxidation will produce off-flavors and can also lead to the formation of inflammatory and irritating breakdown products.
The selection of an emollient mixture for a formulation must also consider parameters such as purity, biodegradability, and sustainability, leading to the development of new processes and types of emollients in the future.
Skin Care Oleyl Alcohol Polyhydric Alcohol Shea Butter Skin Care Product
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Gorcea M, Laura D (2010) Evaluating the physiochemical properties of emollient esters for cosmetic use. Cosmet Toiletries 125:26–33Google Scholar
Iwahashi M, Kasahara Y (2007) Effects of molecular size and structure on self-diffusion coefficient and viscosity for saturated hydrocarbons having six carbon atoms. J Oleo Sci 56:443–448PubMedCrossRefGoogle Scholar
Barry BW (1975) Viscoelastic properties of concentrated emulsions. Adv Colloid Interface Sci 5:37–75CrossRefGoogle Scholar
Huang Z-R, Lin Y-K, Fang JY (2009) Biological and pharmacological activities of squalene and related compounds: potential uses in cosmetic dermatology. Molecules 14:540–554PubMedCrossRefGoogle Scholar
Bondioli P, Mariani C, Lanzani A, Fedeli E, Muller A (1993) Squalene recovery from olive oil deodorizer distillates. J Am Oil Chem Soc 70:763–766CrossRefGoogle Scholar
Chiba K, Yoshizawa K, Makino I, Kawakami K, Onoue M (2000) Comedogenicity of squalene monohydroperoxide in the skin after topical application. J Toxicol Sci 25:77–83PubMedCrossRefGoogle Scholar
Motoyoshi K (1983) Enhanced comedo formation in rabbit ear skin by squalene and oleic acid peroxides. Br J Dermatol 109:191–198PubMedCrossRefGoogle Scholar
Saint-Leger D, Bague A, Lefebvre E, Cohen E, Chivot M (1986) A possible role for squalene in the pathogenesis of acne. II. In vivo study of squalene oxides in skin surface and intra-comedonal lipids of acne patients. Br J Dermatol 114:543–552PubMedCrossRefGoogle Scholar
Saint-Leger D, Bague A, Cohen E, Chivot M (1986) A possible role for squalene in the pathogenesis of acne. I. In vitro study of squalene oxidation. Br J Dermatol 114:535–542PubMedCrossRefGoogle Scholar
Barry BW, Grace AJ (1971) Structural rheological and textural properties of soft paraffins. J Texture Stud 2:259–279CrossRefGoogle Scholar
Gunstone FD, Harwood JL (2007) Occurrence and characterisation of oils and fats. In: Gunstone FD, Harwood JL, Dijkstra AJ (eds) The lipid handbook with CD-ROM. CRC Press, Boca Raton, pp 37–142Google Scholar
Biermann U, Metzger JO (2008) Synthesis of alkyl-branched fatty acids. Eur J Lipid Sci Technol 110:805–811CrossRefGoogle Scholar
Schuchardt U, Sercheli R, Matheus Vargas R (1998) Transesterification of vegetable oils: a review. J Braz Chem Soc 9:199–210CrossRefGoogle Scholar
Thum O, Oxenboll KM (2008) Biocatalysis: a sustainable process for production of cosmetic emollient esters. SÖFW-J 134:44–47Google Scholar
Hills G (2003) Industrial use of lipases to produce fatty acid esters. Eur J Lipid Sci Technol 105:601–607CrossRefGoogle Scholar
RSPO – promoting the growth and use of sustainable palm oil (2011) http://www.rspo.org/[On-line]Google Scholar
Dijkstra AJ, Segers JC (2007) Production and refining of vegetable oils. In: Gunstone FD, Harwood JL, Dijkstra AJ (eds) The lipid handbook with CD-ROM. CRC Press, Boca Raton, pp 143–262CrossRefGoogle Scholar
Dijkstra AJ (2007) Modification processes and food uses. In: Gunstone FD, Harwood JL, Dijkstra AJ (eds) The lipid handbook with CD-ROM. CRC Press, Boca Raton, pp 263–354CrossRefGoogle Scholar
Padley FB (1994) Fractionated products: a brief survey of the application of fractions of edible oils and fats. Society of Chemical Industry, London, 22ppGoogle Scholar
Loden M, Andersson AC (1996) Effect of topically applied lipids on surfactant-irritated skin. Br J Dermatol 134:215–220PubMedCrossRefGoogle Scholar
Alander J (2004) Shea butter - a multifunctional ingredient for food and cosmetics. Lipid Technol 16:202–205Google Scholar
Akihisa T, Kojima N, Kikuchi T, Yasukawa K, Tokuda H, Masters T, Manosroi A, Manosroi J (2010) Anti-inflammatory and chemopreventive effects of triterpene cinnamates and acetates from shea fat. J Oleo Sci 59:273–280PubMedCrossRefGoogle Scholar
Regulation (EC) No 1223/2009 of the European Parliament and of the Council of 30 November 2009 on cosmetic products (2009) Official Journal of the European Union [On-line], L 342/59, 59–209Google Scholar
Kohen R (1999) Skin antioxidants: their role in aging and in oxidative stress–new approaches for their evaluation. Biomed Pharmacother 53:181–192PubMedCrossRefGoogle Scholar
Thiele JJ, Schroeter C, Hsieh SN, Podda M, Packer L (2001) The antioxidant network of the stratum corneum. Curr Probl Dermatol 29:26–42PubMedCrossRefGoogle Scholar
Bruns C, Müller RH, Prinz D, Kutz G (2006) Identification of topical excipients with high performance spreadability. Poster, 5th world meeting on pharmaceutics, Biopharmaceutics and Pharmaceutical Technology, GenevaGoogle Scholar