Abstract
Sedimentation field-flow fractionation–inductively coupled plasma–mass spectrometry (SdFFF-ICP-MS) was successfully applied to investigate particle size distribution of titanium dioxide (TiO2) in sunscreen samples after hexane extraction to remove organic components from the samples. Three brands of sunscreen products of various sun protection factor (SPF) value were used as samples. Different particle size distribution profiles were observed for sunscreen samples of various brands and SPF values; however, the particle size distributions of titanium dioxide in most sunscreen samples investigated in this work were larger than 100 nm. The titanium dioxide concentrations were higher for the products of higher SPF values. By comparing the results obtained from online SdFFF-ICP-MS and those from the off-line ICP-MS determination of titanium after acid digestion, ICP-MS was found to effectively atomize and ionize the titanium dioxide particle without the need for acid digestion of the samples. Therefore, the online coupling between SdFFF and ICP-MS could be effectively used to provide quantitative information of titanium dioxide concentrations across particle size distribution profiles.
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Acknowledgments
The Center for Innovation in Chemistry: Postgraduate Education and Research Program in Chemistry (PERCH-CIC), Commission on Higher Education, Ministry of Education is gratefully acknowledged for the studentship support for A. Samontha, the partial research support for A. Siripinyanond, and the purchase of the SdFFF equipment. Thanks are also due to the Thailand Research Fund for the research support for A. Siripinyanond. This paper was presented in part at the Pure and Applied Chemistry Conference 2010 (PACCON 2010), Ubonratchathani, Thailand, January 21–23, 2010, Oral Presentation Number ANC-OR-17.
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Samontha, A., Shiowatana, J. & Siripinyanond, A. Particle size characterization of titanium dioxide in sunscreen products using sedimentation field-flow fractionation–inductively coupled plasma–mass spectrometry. Anal Bioanal Chem 399, 973–978 (2011). https://doi.org/10.1007/s00216-010-4298-z
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DOI: https://doi.org/10.1007/s00216-010-4298-z