首页|spICP-MS assessment of ZnONPs and TiO2NPs in moisturisers after a tip sonication sample pre-treatment
spICP-MS assessment of ZnONPs and TiO2NPs in moisturisers after a tip sonication sample pre-treatment
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NSTL
Elsevier
? 2022 Elsevier B.V.The use of zinc oxide (ZnONPs) and titanium dioxide nanoparticles (TiO2NPs) in cosmetic formulations to obtain protection against the sun's UV radiation has become a common practice owing to their high photo-stability and the absence of allergic reactions of these nanomaterials. The manufacturing of cosmetics modified with nanoparticles has been regulated in Europe since 2009. Nevertheless, methodologies for sample pre-treatment and characterisation (quantification and size assessment) of nanoparticles from complex matrices are scarce and still in development. The proposed methodology was based on the tip sonication of moisturisers in an organic solvent [40 mL of acetone, 40% amplitude, 5 min and discontinuous mode with 59 s of relax after 59 s tip sonication] followed by spICP-MS, which provides information about concentration and size of the NPs. The whole methodology was repeatable (RSDs lower than 10% for size and concentration values of ZnONPs and TiO2NPs) and accurate (analytical recoveries of 102 ± 12% and 119 ± 3%for ZnONPs and TiO2NPs standards, respectively). The over-all procedure was applied to several commercial moisturisers with solar sun protection. spICP-MS results were compared with total content of analyte in the extracts and in the acid digested samples. Finally, transmission electron microscopy coupled to energy dispersive X-ray spectroscopy analysis of extracts from moisturising creams was carried out as comparative (qualitative) assessment.
Rujido-Santos I.、Herbello-Hermelo P.、Barciela-Alonso M.C.、Bermejo-Barrera P.、Moreda-Pineiro A.
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Group of Trace Element Spectroscopy and Speciation (GETEE) Institute of Materials iMATUS Department of Analytical Chemistry Nutrition and Bromatology Faculty of Chemistry Universidade de Santiago de Compostela
NSTL
Elsevier
