title: Determination of sixteen UV filters in suncare formulations by high-performance liquid chromatography.
abstract: Reversed-phase liquid chromatography (RP-LC) with UV detection was developed for the simultaneous determination of 16 organic UV filters worldwide authorized in suncare products. The filters determined were: 4-aminobenzoic acid, homosalate, benzophenone-3,2-phenylbenzimidazole-5-sulfonic acid, terephthalidene dicamphor sulfonic acid, 4-tert-butyl-4'-methoxy-dibenzoylmethane, octocrylene, 2-ethylhexyl-4-methoxycinnamate, isoamyl-p-methoxycinnamate, ethylhexyltriazone, drometrizole trisiloxane, diethylhexyl butamido triazone, 3-(4-methylbenzyliden) camphor, 2-ethylhexylsalicylate, 2-ethylhexyl-4-dimethylaminobenzoate and benzophenone-4. A C18 stationary phase and a gradient of ethanol-aqueous acetate buffer containing 0.2 mM of EDTA, was used with a flow-rate of 1.0 ml/min. UV detection was carried out at 313 and 360 nm. The analysis required 32 min and the limits of detection were between 30 and 4130 mg/kg in the original suncare product. Tween 80 was used to break down the different emulsions in order to procure a proper extraction of the UV filters. The method was validated for UV filters in three matrices, oil, water-in-oil emulsion and oil-in-water emulsion. Recoveries from spiked samples were 86-113% depending on the matrix used.
authors.affiliation: Food and Consumer Product Safety Authority, Inspectorate for Health Protection and Veterinary Public Health (VWA/KvW), Research Lab Non Food Chemical, Paterswoldseweg 1, 9726 BA Groningen, The Netherlands. durk.schakel@vwa.nl
authors.forename: D J
authors.initials: DJ
authors.lastname: Schakel
authors.forename: D
authors.initials: D
authors.lastname: Kalsbeek
authors.forename: K
authors.initials: K
authors.lastname: Boer
mesh_terms: D002626:Chemistry, Pharmaceutical; D002851:Chromatography, High Pressure Liquid; D004492:Edetic Acid; D004655:Emulsions; D000431:Ethanol; D007202:Indicators and Reagents; D009821:Oils; D011136:Polysorbates; D012015:Reference Standards; D015203:Reproducibility of Results; D012996:Solutions; D012997:Solvents; D013473:Sunscreening Agents / Q000032:analysis*; D014465:Ultrasonics; D014466:Ultraviolet Rays
chemical_list: D004655:Emulsions; D007202:Indicators and Reagents; D009821:Oils; D011136:Polysorbates; D012996:Solutions; D012997:Solvents; D013473:Sunscreening Agents; D000431:Ethanol; D004492:Edetic Acid