Synthesis of novel white pigments by shaking cerium compounds with phosphoric acid

Onoda, Hiroaki; Iwashita, Mio

doi:10.1007/s42247-022-00432-5

Cited by 3 publications

(3 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The latter drawback is also characteristic of commercial metal oxide UV filters, such as TiO 2 or ZnO [3][4][5]. Phosphate compounds are considered as alternative inorganic UV filters because of their biocompatibility, high chemical and thermal stability of the phosphate matrix [6][7][8]. Recently, crystalline cerium(IV) phosphates were reported to be promising sunscreen candidates [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic-assisted hydrothermal synthesis of nanoscale double ceric phosphates

Ivanov,

Baranchikov,

Teplonogova

et al. 2024

Nanosystems: Phys. Chem. Math.

View full text Add to dashboard Cite

The combination of ultrasonic exposure on ceric phosphate gels with subsequent hydrothermalmicrowave treatment resulted in the formation of nanoscale NH 4 Ce 2 (PO 4 ) 3 or KCe 2 (PO 4 ) 3 phases. The sun protection factor (SPF) and protection factor against UV-A radiation (UVAPF) values for double ceric phosphates with the smallest crystallite sizes exceeded 4 and 3.5, respectively, which is much higher than the values for samples consisting of larger particles. These results are superior to previously published values for similar ceric compounds, and thus show promise for their application in sunscreens.

show abstract

Section: Introductionmentioning

confidence: 99%

Ultrasonic-assisted hydrothermal synthesis of nanoscale double ceric phosphates

Ivanov,

Baranchikov,

Teplonogova

et al. 2024

Nanosystems: Phys. Chem. Math.

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

“…Moreover, even if the beneficial antioxidant properties of nanodispersed cerium dioxide are retained on skin surface, they can be lost due to the interaction of CeO 2 with phosphate groups presented in sunscreen components or in cell membranes [24][25][26]. Cerium dioxide is extremely prone to catalytic oxidation of organic compounds [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Ceric phosphates and nanocrystalline ceria: selective toxicity to melanoma cells

Kozlova¹,

Попов²,

Romanov³

et al. 2023

Nanosystems: Phys. Chem. Math.

View full text Add to dashboard Cite

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.

show abstract

Synthesis of novel white pigments by shaking cerium compounds with phosphoric acid

Cited by 3 publications

References 20 publications

Ultrasonic-assisted hydrothermal synthesis of nanoscale double ceric phosphates

Ultrasonic-assisted hydrothermal synthesis of nanoscale double ceric phosphates

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

Ceric phosphates and nanocrystalline ceria: selective toxicity to melanoma cells

Contact Info

Product

Resources

About