Yun Sik Nam, Il Keun Kwon, Yeonhee Lee, Kang-Bong Lee

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Quantitative monitoring of corticosteroids in cosmetic products manufactured in Korea using LC–MS/MS Yun Sik Nam, Il Keun Kwon, Yeonhee Lee, Kang-Bong Lee Forensic Science International Volume 220, Issue 1, Pages e23-e28 (July 2012) DOI: 10.1016/j.forsciint.2011.12.011 Copyright © 2011 Elsevier Ireland Ltd Terms and Conditions

Fig. 1 Chemical structure of corticosteroids monitored in this study: [A] general structure of corticosteroid, [B] prednisolone, [C] hydrocortisone, [D] betamethasone [E] dexamethasone, and [F] triamcinolone acetonide. Forensic Science International 2012 220, e23-e28DOI: (10.1016/j.forsciint.2011.12.011) Copyright © 2011 Elsevier Ireland Ltd Terms and Conditions

Fig. 2 Typical MRM chromatograms of [A] prednisolone (m/z 361.2→147.1), [B] hydrocortisone (m/z 363.1→121.1), [C] betamethasone (m/z 393.2→147.1), [D] dexamethasone (m/z 393.2→147.2) and [E] triamcinolone acetonide (m/z 435.1→213.1) spiked in blank cosmetic sample with 1μg/mL level. Forensic Science International 2012 220, e23-e28DOI: (10.1016/j.forsciint.2011.12.011) Copyright © 2011 Elsevier Ireland Ltd Terms and Conditions

Fig. 3 Collision-induced dissociation (CID) mass spectra for [A] prednisolone, [B] hydrocortisone, [C] betamethasone, [D] dexamentasone and [E] triamcinolone acetonide and [F] [2H4]-Hydrocortisone (IS). Forensic Science International 2012 220, e23-e28DOI: (10.1016/j.forsciint.2011.12.011) Copyright © 2011 Elsevier Ireland Ltd Terms and Conditions

Fig. 4 MRM chromatograms of real cosmetic samples at transitions [A] m/z 361→121, 147, 171 (representatives of prednisolone), [B] m/z 363→121, 147, 267 (representatives of hydrocortisone), [C] m/z 393→147, 237, 355 (representatives of betamethasone), [D] m/z 393→147, 171, 237 (representatives of dexamethasone) and [E] m/z 435→171, 213, 225 (representatives of triamcinolone acetonide). Chromatograms [A] and [E] were matched with product ions of standards, prednisolone and triamcinolone acetonide, respectively. Forensic Science International 2012 220, e23-e28DOI: (10.1016/j.forsciint.2011.12.011) Copyright © 2011 Elsevier Ireland Ltd Terms and Conditions