Ex vivo penetration analysis and anti-inflammatory efficacy of the association of ferulic acid and UV filters

Author(s)

Sauce, Rafael ^[1] ; Sales de Oliveira Pinto, Claudineia Aparecida ^[1] ; Robles Velasco, Maria Valeria ^[1] ; Rosado, Catarina ^[2] ; Baby, Andre Rolim ^[1]

Affiliation

^[1] Univ Sao Paulo, Fac Pharmaceut Sci, Dept Pharm, Sao Paulo - Brazil

^[2] CBIOS Univ Lusofonas, Res Ctr Biosci & Hlth Technol, Lisbon - Portugal

• Document type: Journal article
• Source: European Journal of Pharmaceutical Sciences; v. 156, JAN 1 2021.
• Web of Science Citations: 0

Abstract

Background: Unprotected chronic exposure to ultraviolet (UV) radiation generates many harmful effects to human skin and sunscreens are essential to health, however, traditional products do not provide enough protection against cutaneous oxidative stress, a process amplified by UV radiation. Therefore, the development of multifunctional photoprotective formulations seems to be a more efficacious approach, since these enable the absorption/reflection of UV radiation and maintain the cutaneous homeostasis. Objectives: In the present study, ferulic acid (FA), a well-known antioxidant, has been combined with two UV filters, bemotrizinol and ethylhexyl triazone, and the safety and efficacy of this formulation has been assessed combining ex vivo and in vivo methods. Methods: Skin permeation assays were performed by applying the formulation in the volar forearm of participants, after which consecutive samples of the stratum corneum were collected by tape stripping, and the quantification of FA, bemotrizinol and ethylhexyl triazone was performed by high-performance liquid chromatography (HPLC). Also, the FA anti-inflammatory action in combination with the UV filters was probed through a method employing Laser Doppler flowmetry to measure the vasodilatory response to methyl nicotinate topical application. Results: Skin permeation assay was able to characterize the penetration depth of each substance. It should also be noted that a specific HPLC analytical method was developed in this study to enable the rapid simultaneous quantification of the three substances. Results from Laser Doppler flowmetry showed that the FA was able to mitigate the vasodilatory response. Conclusions: FA proved to be a valuable resource in a multifunction sunscreen, not only providing an increase in the SPF of sunscreens, previously published, but also decreasing the extent of inflammation. (AU)

• FAPESP's process: 19/16169-0 - Ex vivo and in vivo establishment of new chemopreventive properties of UV filters
• Grantee: André Rolim Baby
• Support Opportunities: Regular Research Grants
• FAPESP's process: 16/24360-4 - Antilipoperoxidative and anti-inflammatory effects of multifunctional sunscreens containing ferulic acid
• Grantee: André Rolim Baby
• Support Opportunities: Regular Research Grants