Abstract
The article describes a method for the determination of titanium oxide nanoparticles (TiO2NPs) in sunscreens using N-doped graphene quantum dots (N-GQDs). The TiO2-NPs are first extracted from the highly lipophilic sunscreen via liquid-liquid extraction. Subsequent fluorimetric analysis of the extracts is based on the quenching effect exerted by TiO2NPs on the fluorescence of N-GQDs. The effect is assumed to be due to an electrostatic interaction and/or hydrogen bonding between the particles. The limit of detection for TiO2NPs is 1.4 μg⋅g‾1. The precision at a 5 μg⋅g‾1 concentration of TiO2NPs is 6.95 %. The optimized procedure was successively applied to the determination of TiO2 NPs in sunscreens with different sun protection factors.
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Acknowledgments
The authors wish to thank Spain’s Ministry of Economy and Competitivity for funding Project CTQ2014-52939R and Junta de Andalucía for Project FQM4801. S. Benítez-Martínez is also grateful to Junta de Andalucía for the award of a Research Training Fellowship.
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Benítez-Martínez, S., López-Lorente, Á.I. & Valcárcel, M. Determination of TiO2 nanoparticles in sunscreen using N-doped graphene quantum dots as a fluorescent probe. Microchim Acta 183, 781–789 (2016). https://doi.org/10.1007/s00604-015-1696-0
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DOI: https://doi.org/10.1007/s00604-015-1696-0