Preparation and Characterization of Plate-like Cerium Phosphate / Nanosize Calcia Doped Ceria Composites by Precipitation Method

Yin, Shu; Saito, M.; Liu, Xiangwen; Sato, Tsugio

doi:10.3363/prb.25.68

Cited by 2 publications

(2 citation statements)

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“…In previous studies regarding cerium phosphates as UV-protective materials, much attention was paid to Ce(III) compounds [12][13][14][15][16], and only a few reports were devoted to Ce(IV) phosphates [17,18] or cerium phosphate composites with CeO 2 [19,20]. All of these materials have been shown to possess a high-enough absorption in the UV range and extremely low photocatalytic activity, which makes them suitable for use in sunscreen cosmetics.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Cerium(III) and Cerium(IV) Phosphates for Sunscreens

Kozlova,

Vasilyeva,

Kozlov

et al. 2024

Molecules

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Crystalline cerium(III) phosphate (CePO4), cerium(IV) phosphates, and nanocrystalline ceria are considered to be promising components of sunscreen cosmetics. This paper reports on a study in which, for the first time, a quantitative comparative analysis was performed of the UV-shielding properties of CePO4, Ce(PO4)(HPO4)0.5(H2O)0.5, and CePO4/CeO2 composites. Both the sun protection factor and protection factor against UV-A radiation of the materials were determined. Ce(PO4)(HPO4)0.5(H2O)0.5 was shown to have a sun protection factor of 2.9, which is comparable with that of nanocrystalline ceria and three times higher than the sun protection factor of CePO4. Composites containing both cerium dioxide and CePO4 demonstrated higher sun protection factors (up to 1.8) than individual CePO4. When compared with the TiO2 Aeroxide P25 reference sample, cerium(III) and cerium(IV) phosphates demonstrated negligible photocatalytic activity. A cytotoxicity analysis performed using two mammalian cell lines, hMSc and NCTC L929, showed that CePO4, Ce(PO4)(HPO4)0.5(H2O)0.5, and nanocrystalline ceria were all non-toxic. The results of this comparative study indicate that cerium(IV) phosphate Ce(PO4)(HPO4)0.5(H2O)0.5 is more advantageous for use in sunscreens than either cerium(III) phosphate or CePO4/CeO2 composites, due to its improved UV-shielding properties and low photocatalytic activity.

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Section: Introductionmentioning

confidence: 99%

A Comparative Study of Cerium(III) and Cerium(IV) Phosphates for Sunscreens

Kozlova,

Vasilyeva,

Kozlov

et al. 2024

Molecules

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“…biocompatibility of the phosphate matrix, along with high ultraviolet absorption and low photocatalytic activity of cerium phosphates, provide interest in these compounds as promising inorganic UV filters [32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Ceric phosphates and nanocrystalline ceria: selective toxicity to melanoma cells

Kozlova¹,

Попов²,

Romanov³

et al. 2023

Nanosystems: Phys. Chem. Math.

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Nanocrystalline cerium dioxide is a promising inorganic UV filter for sunscreen applications due to its high UV absorbance and non-toxicity to normal cells. Nanoscale CeO 2 also showed selective cytotoxicity to cancer cells, thus ceria-containing materials are now regarded for the creation of both preventive and therapeutic compositions. At the same time, the interaction of ceria nanoparticles with cell membranes and phosphate-rich components of sunscreen compositions arise the interest to biocompatibility of ceric phosphates. Crystalline cerium(IV) phosphates can be a promising alternative for nanoscale CeO 2 due to their low solubility, high redox stability and UV protective property. However, to date, there is no information on their toxicity to cancer cells. In this work, using the MTT, Live/Dead and MMP assays, we demonstrated for the first time that the inhibitory impact of ceric phosphates Ce(PO 4 )(HPO 4 ) 0.5 (H 2 O) 0.5 and NH 4 Ce 2 (PO 4 ) 3 on murine melanoma B16/F10 cell line in vitro is comparable to that of nanoscale CeO 2 , at high (500-1000 µg/ml) concentrations. KEYWORDS ceric phosphates, ceria, metabolic activity, reactive oxygen species, UV protectors. ACKNOWLEDGEMENTS This work was supported by Russian Science Foundation (Grant no. 21-73-00294, https://rscf.ru/en/project/21-73-00294/) using the equipment of the JRC PMR IGIC RAS.

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Preparation and Characterization of Plate-like Cerium Phosphate / Nanosize Calcia Doped Ceria Composites by Precipitation Method

Cited by 2 publications

References 7 publications

A Comparative Study of Cerium(III) and Cerium(IV) Phosphates for Sunscreens

A Comparative Study of Cerium(III) and Cerium(IV) Phosphates for Sunscreens

Ceric phosphates and nanocrystalline ceria: selective toxicity to melanoma cells

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