HPLC method for the simultaneous determination of the UV-Filters butyl methoxy dibenzoylmethane and octocrylene in the presence of their photodegradants

Kockler, Jutta, Motti, Cherie A., Robertson, Sherryl, Oelgemöller, Michael, and Glass, Beverley D. (2013) HPLC method for the simultaneous determination of the UV-Filters butyl methoxy dibenzoylmethane and octocrylene in the presence of their photodegradants. Chromatographia, 76 (23-24). pp. 1721-1727.

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Abstract

Butyl methoxy dibenzoylmethane (BMDM) and octocrylene (OC), common UV-filters in sunscreen products are often used in combination. Together they provide broad spectrum photoprotection from exposure to both UVA- and UVB-light. These UV-filters may, however, undergo photodegradation and generate photodegradants, resulting in a potential loss of photoprotection. It is thus a concern that the photostability testing as described by the ICH Guideline Q1B is not a requirement for sunscreen products in Australia, Europe or the USA. UV-filter photodegradants have in addition been shown to be toxic, highlighting the importance of their separation from the parent UV-filters. An HPLC method was developed and validated to quantitatively determine a combination of these UV-filters in the presence of their photodegradants. Reverse-phase chromatography was employed, using a C18 column and an isocratic mobile phase consisting of methanol/water/acetic acid (89/10/1 v/v). Validation according to the ICH guidelines for linearity, accuracy, precision, sensitivity, specificity and robustness was confirmed. The developed and validated method was then successfully applied to the determination of BMDM and OC in an aqueous cream base, typically used in sunscreens, after photostability testing, according to the ICH Guideline Q1B. In addition, the diketo-enol ratio of BMDM in methanol-d 4 was determined by NMR and the two major photodegradants were identified by FTMS and LC–MS.

Item ID: 30355
Item Type: Article (Research - C1)
ISSN: 1612-1112
Keywords: HPLC, UV-filter and photodegradants, butyl methoxy dibenzoylmethane, octocrylene, method validation, aqueous cream
Funders: James Cook University (JCU)
Date Deposited: 27 Nov 2013 07:43
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1115 Pharmacology and Pharmaceutical Sciences > 111504 Pharmaceutical Sciences @ 70%
03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030505 Physical Organic Chemistry @ 30%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 30%
97 EXPANDING KNOWLEDGE > 970111 Expanding Knowledge in the Medical and Health Sciences @ 70%
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