Abstract
Due to their omnipresence in consumer products, there is a growing concern about the potential effects of nanoparticles on human health. Toxicological assessment and NP end-product studies require proper quantification of these materials in biological fluids. However, their quantifications in these media require stable predispersed NP solutions in aqueous media to enable the fortification in the matrices of interest or the preparation of calibration standards. In this study, a sample preparation scheme was developed by studying various dispersion media (polyvinylpyrrolidone and polyethylene glycol) and sonication strategies (bath and ultrasonic probe) to ensure homogeneous dispersion of titanium dioxide nanoparticles. Optimization of the various parameters was performed using SRM NIST 1898 NP reference material, composed of rutile and anatase phases. Number-based size distribution for titanium dioxide NPs was determined by dynamic light scattering and single-particle inductively coupled plasma mass spectrometry to evaluate the procedure efficiency. Changes in mean size and most frequent size distribution were also studied to determine if the agglomeration of nanoparticles occurs at the various dispersion conditions tested. Among the different dispersion parameters tested herein, the use of polyvinylpyrrolidone combined with a sonication process generated by a probe leads to a significant improvement in terms of suspension efficiency and stability over 72 h. The dispersion efficiency of the proposed methodology was assessed by single-particle inductively coupled plasma mass spectrometry with spiked biological fluids such as urine and blood.
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Acknowledgments
The author (S. Salou) wishes to thank Rodica Neagu Plesu for providing access to the DLS instrumentation and training, Richard Janvier for the TEM training and support, and Girish Shah and Mihaela Robu for the sonication device to optimize the sample preparation procedure. The author thanks Dr. Chady Stephan and Andrew Rams from PerkinElmer for the fruitful discussion regarding this study and C. Bedwin for her editorial comments. We thank the European Commission for providing the NM10200a TiO2 NP nanomaterials for free.
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The samples were provided from another CTQ division as a reference matrix for analytical purposes only.
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Salou, S., Cirtiu, CM., Larivière, D. et al. Assessment of strategies for the formation of stable suspensions of titanium dioxide nanoparticles in aqueous media suitable for the analysis of biological fluids. Anal Bioanal Chem 412, 1469–1481 (2020). https://doi.org/10.1007/s00216-020-02412-2
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DOI: https://doi.org/10.1007/s00216-020-02412-2