The water-soluble sunscreen 2-phenylbenzimidazole-5-sulfonic acid (PBS) was quantified in a sun-care product and water samples by thin layer chromatography followed by densitometric scanning in fluorescence mode (cut-off filter 370 nm, wavelength of excitation — 300 nm). Normal phase TLC was performed on silica gel 60 as stationary phase. Mobile phase used was ethyl acetate-ethanol-water 70:35:30 (v/v/v). The limit of detection (LOD) was 0.0004 μg spot-1, and the limit of quantification (LOQ) was — 0.001 µg spot−1 without any sample pre-concentration.
 K. Ferenczi-Fodor, B. Renger, Z. Vegh, J. Planar Chromatogr. 23, 173 (2010) http://dx.doi.org/10.1556/JPC.23.2010.3.1
 ICH Harmonized Tripartite Guideline: Validation of Analytical Procedures: Text and Methodology, Q2 (R1) (Geneva, 2005) http://www.ich.org
 P. Konieczko, J. Namiesnik (Eds.), Ocena i kontrola jakości wyników pomiarów analitycznych (Evaluation and quality control of analytical results) (Wydawnictwo Naukowo-Techniczne, Warszawa 2007) pp. 269–288 (In Polish)