DETERMINATION OF THE SUNSCREEN OXYBENZONE IN LOTIONS BY REVERSED-PHASE HPTLC WITH ULTRAVIOLET ABSORPTION DENSITOMETRY
作者:
E. Westgate,
J. Sherma,
期刊:
Journal of Liquid Chromatography & Related Technologies
(Taylor Available online 2000)
卷期:
Volume 23,
issue 4
页码: 609-615
ISSN:1082-6076
年代: 2000
DOI:10.1081/JLC-100101477
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A quantitative method using preadsorbent chemically bonded C18reversed-phase silica gel plates with fluorescent indicator, automated sample application, and computer-controlled UV absorption densitometry has been developed for the determination of the sunscreen ingredient oxybenzone (OB) in lotions. Nine sunscreen lotions were analyzed to test the proposed method and assess the relationship between OB content and the SPF value stated on the labels. It was found that the amount of OB in the lotions tested ranged from 0.796–6.03% (SPF 4–45). Precision (RSD) was 2.2% for replicate analysis of four sample solutions of one lotion on one plate and 4.6% for four analyses of one sample solution on different plates. Errors from spiked blanks and standard addition analyses to validate accuracy were 0 and 0.67% for the two blanks and 1.3% for the standard addition validation.
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