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Estimates of lung burden risk associated with long-term exposure to TiO2 nanoparticles as a UV-filter in sprays

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Abstract

Titanium dioxide (TiO2) nanoparticles (NPs) are employed as an ultraviolet filter in sunscreen products because of their high ultraviolet absorptivity. However, sunscreen sprays may pose health risks due to the toxicity of inhaled TiO2 NPs. Therefore, we estimated the potential human health risk posed by inhaled TiO2 NPs emitted from sunscreen sprays. The physiology-based lung model was employed to predict the lung TiO2 NPs burden caused by long-term exposure. A Hill-based dose–response model described the relationship between lung inflammation and TiO2 NP accumulation. The Weibull threshold model was used to estimate the threshold amount of accumulation inducing 0.5% of the maximum increase in neutrophils. The potential health risk was assessed using a hazard quotient–based probabilistic risk model. All data obtained to date indicate that application of sunscreen sprays poses no significant health risk. However, using data simulations based on the threshold criterion, we discovered that in terms of practical strategies for preventing the risks posed by inhaled TiO2 NPs emitted from spray products, the suggested daily use amount and pressing number are 40 g (95% confidence interval: 11–146 g) and 66 (18–245), respectively. In this study, we successfully translated the potential health risk of long-term exposure to NP-containing sunscreen sprays and recommendations for daily application into mechanistic insights.

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Acknowledgements

The authors thank all members from Biosystems Simulation and Control Lab, National Taiwan University for logistical support during research. This manuscript was edited by Wallace Academic Editing.

Data and materials availability

All data and supporting materials of this study are included in the manuscript. The daily inhaled doses for airborne TiO2 NPs obtained from 8 commercial sunscreen spray products were provided by SCCS (2018). The dose–response data of TiO2 NPs and adverse effects in a murine model were adopted from Rossi et al. (2010a).

Funding

This study was supported by the Ministry of Science and Technology of Taiwan under Grant MOST-105-2313-B002-020-MY3.

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Contributions

Wei-Ming Wang: performed data collection, analyzed the data, implemented simulations, and drafted original manuscript. Chi-Yun Chen: analyzed the data and performed the research. Tien-Hsuan Lu: analyzed the data and performed the research. Ying-Fei Yang: planned the research, performed results analysis, and did supervision. Chung-Min Liao: designed the research, did supervision, and wrote the paper. All authors helped to interpret the results and provided feedback on the manuscript.

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Correspondence to Chung-Min Liao.

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The article does not contain any studies with human participants or animals performed by any of the authors.

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The authors declare no competing interests.

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Responsible Editor: Lotfi Aleya

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Wang, WM., Chen, CY., Lu, TH. et al. Estimates of lung burden risk associated with long-term exposure to TiO2 nanoparticles as a UV-filter in sprays. Environ Sci Pollut Res 28, 32460–32474 (2021). https://doi.org/10.1007/s11356-021-12924-8

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  • DOI: https://doi.org/10.1007/s11356-021-12924-8

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