title: Validation of a HPLC method for simultaneous determination of five sunscreens in lotion preparation.
abstract: The aim of this research was to develop and validate a high-performance liquid chromatographic (HPLC) method for simultaneous determination of five sunscreens, namely benzophenone-3 (B-3), butyl methoxydibenzoylmethane (BM), octyl methoxycinnamate (OM), octyl salicylate (OS) and homosalate (HS). The separation and quantitative determination was made by HPLC at 40 +/-1 degrees C with a gradient elution from 10% to 100% mobile phase B in mobile phase A. The gradient liquid chromatographic system constituted of mobile phase A [acetonitrile : water (10 : 90 v/v)] and mobile phase B [acetonitrile : water (90 : 10 v/v)], at a flow rate of 1.0 mL min(-1) and ultraviolet detection at 310 nm. The separation was obtained with two Waters reversed phase columns: Novapack C-18 and Symmetry((R)) C-18 connected in series. All sunscreens were efficiently separated within 17 min. The coefficient of correlation and average recovery for B-3, BM, OM, OS and HS were 0.9798 and 98.5%, 0.9672 and 98.8%, 0.9922 and 99.1%, 0.9961 and 98.9% and 0.9909 and 99.4% respectively. The relative standard deviations obtained were between 1.07% and 2.44%. The excipients did not interfere in the analysis. The results showed that the proposed method could be used for rapid and simultaneous determination of B-3, BM, OM, OS and HS in sunscreen lotions with precision, accuracy and specificity.
authors.affiliation: Department of Pharmacy, University of São Paulo, Caixa Postal 66083, São Paulo, SP, Brazil. ermkedor@usp.br
authors.forename: E R M
authors.initials: ER
authors.lastname: Kedor-Hackmann
authors.forename: M L
authors.initials: ML
authors.lastname: De Lourdes Pérez González
authors.forename: A K
authors.initials: AK
authors.lastname: Singh
authors.forename: M I R M
authors.initials: MI
authors.lastname: Santoro