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http://dx.doi.org/10.15230/SCSK.2012.38.1.033

Accurate Analysis of Trace Phthalates and Method Validation in Cosmetics using Gas Chromatography with Mass Spectrometric Detection  

Kim, Min-Kee (Skin Research Institute, AMOREPACIFIC Corporation R&D Center)
Jeong, Hye-Jin (Skin Research Institute, AMOREPACIFIC Corporation R&D Center)
Cho, Jun-Cheol (Skin Research Institute, AMOREPACIFIC Corporation R&D Center)
Publication Information
Journal of the Society of Cosmetic Scientists of Korea / v.38, no.1, 2012 , pp. 33-41 More about this Journal
Abstract
An effective, environmentally friendly analytic methods using gas chromatography with mass spectrometric detector (GC-MSD) have been developed for the quantitative analysis of trace phthalate levels in cosmetics such as nail lacquer and hair spray. Since such cosmetics are largely comprised of organic solvents, conventional clean-up methods that have been widely used for phthalate analyses are in adequate. In addition, analysis of trace phthalate levels is notorious for its sensitivity to contamination, which causes high analytical values. A direct sample dilution method using an organic solvent was adopted to the sample preparation process to determine the exact amounts of phthalates and simultaneously avoid the high risk of secondary contamination. The method has many advantages including high accuracy, sensitivity, and simplicity in sample preparation. Dibutyl phthalate (DBP) and di (2-ethylhexyl) phthalate (DEHP) were selected for analysis because they have been frequently detected in cosmetics and consistently reported as endocrine disruptors in humans and animals. Internal standard method using two deuterium substitutes (DBP-$d_4$, DEHP-$d_4$) as the internal standard was also used. The results of 'Method validation' showed the capabilities of this method for the routine analysis of phthalates at the ppm level. The recovery ranges were between 95 % and 106.1 %, and relative standards deviations (RSD) were less than 3.9 % in fortified nail lacquer and hair spray samples at the concentration of $25{\mu}g/g$.
Keywords
cosmetics; dibutyl phthalate; di (2-ethylhexyl) phthalate; gas chromatography with mass spectrometric detector; method validation;
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