JOURNAL OF COSMETIC SCIENCE 106 Figure 1. Structures of 16 UV fi lters: (1) PABA (2) 2-Phenylbenzimidazole-5-sulfonic acid (3) Tere- phthalylidene dicamphor sulfonic acid (4) Benzophenone-8 (5) Benzophenone-3 (6) Isoamyl p-methoxycin- namate (7) Drometrizole (8) 4-Methylbenzylidene camphor (9) Octocrylene (10) Menthyl anthranilate (11) Ethylhexyl dimethyl PABA (12) Butyl methoxydibenzoylmethane (13) Ethylhexyl methoxycinnamate (14) Diethylhexyl butamidotriazone (15) Ethylhexyl triazone (16) Methylene bis-benzotriazolyl tetrameth- ylbutylphenol.

MONITORING OF UV FILTERS BY HPLC 107 acid (21245-02-3), ethylhexyl methoxycinnamate (5466-77-3), p-aminobenzoic acid (150- 13-0), 2-phenylbenzimidazole-5-sulfonic acid (27503-81-7), isoamyl p-methoxycinnamate (71617-10-2), and Tween 80 were purchased from Sigma-Aldrich Korea (Seoul, Korea). We obtained 4-methylbenzylidene camphor (36861-47-9) from Alfa Aesar Korea (Seoul, Korea), butyl methoxydibenzoylmethane (70356-09-1) from Wako (Osaka, Japan), ethylhexyl triazone (88122-99-0) and methylene bis-benzotriazolyl tetramethylbutylphenol (103597-45-1) from BASF Korea (Seoul, Korea), diethylhexyl butamidotriazone (154702-15-5) from 3V Sigma (Georgetown, USA), and terephthalylidene dicamphor sulfonic acid (92761-26-7) from L’Oreal Korea (Seoul, Korea). Methanol (MeOH), aceto- nitrile, water, ethanol (EtOH), isopropanol, dimethylformamide (DMF), acetone, and tetrahydrofuran (THF) were obtained as HPLC grade from Burdick & Jackson (Morristown, NJ). For monitoring, 23 sunscreens were purchased from local markets. Cream and lotion matrixes for recovery study were generously given by LG Household & Health Care (Korea), and their formulas are described in Table II. Table II Formula of Cream and Lotion Matrixes Used for Recovery Study Cream matrix Lotion matrix INCI Name (%) INCI Name (%) Water 64.90 Water 77.73 Cyclopentasiloxane 6.46 Glycerin 4.69 Glycerin 6.46 Hydrogenated polydecene 4.69 Hydrogenated polydecene 4.62 Dipropylene gylcol 2.82 Cetearyl alcohol 2.95 Octyldodecyl myristate 1.88 Butylene glycol 2.77 Isocetyl myristate 1.41 Triethylhexanoin 1.85 Polyglyceryl-3 methylglucose distearate 1.41 Pentaerythirityl tetraethylhexanoate 1.85 Cetearyl alcohol 1.13 Butyrospermum park II (shea butter) 1.38 G1yceryl stearate, PEG-100 stearate 1.13 Mineral oil, microcrystalline wax, paraffi n 0.92 Glyceryl stearate 0.94 PEG-40 stearate 0.92 Cetyl ethylhexanoate 0.94 Sorbitan stearate 0.92 Dimethicone 0.38 Portulaca oleracea extract 0.92 Methyl paraben 0.19 Glyceryl stearate 0.46 Triethanolamine 0.13 Glyceryl stearate, PEG-100 stearate 0.46 Carbomer 0.13 Stearic acid 0.46 Fragrance 0.11 Beeswax 0.46 Propyl paraben 0.09 Dimethicone 0.28 Ethyl paraben 0.09 Methyl paraben 0.23 Tocopheryl acetate 0.09 Fragrance 0.18 Trisodium EDTA 0.02 Triethanolamine 0.14 Propyl paraben 0.09 Ethyl paraben 0.09 Tocopheryl acetate 0.09 Carbomer 0.06 Xanthan gum 0.04 Trisodium EDTA 0.02