Suppression of the photocatalytic activity of TiO 2 nanoparticles encapsulated by chitosan through a spray-drying method with potential for use in sunblocking applications

Abstract

K. (2018). Suppression of the photocatalytic activity of TiO2 nanoparticles encapsulated by chitosan through a spray-drying method with potential for use in sunblocking applications. Powder Technology, 329 252-259. AbstractSolar exposure, in particular to UVA and UVB radiation, is a major carcinogen through direct DNA damage and the production of reactive oxygen species (ROS). Inorganic UV filters present in sunscreening agents, such as titanium dioxide (TiO 2 ), are commonly employed for protection however, due to their photocatalytic nature, they have been shown to instigate the production of ROS when irradiated with UV radiation, which in turn can lead to the degradation of the sunscreening formulation and subsequent damage to the skin. In this work, chitosan/TiO 2 nanocomposite particles were produced via a spray-drying method, in a single step, directly through aqueous solution for the purpose of reducing the photocatalytic activity of commercially available TiO 2 nanoparticles. The photocatalytic activity of the nanocomposite materials were assessed using the organic dye, crystal violet, as the degradation target and irradiating in a UV reactor. It was found that the photoactivity of the chitosan encapsulated nanoparticles were greatly reduced compared to that of the pristine TiO 2 nanoparticles, from 95% degradation after 120 min for pristine TiO 2 to 39.5% for the chitosan/TiO 2 spray dried particles, highlighting the potential for this simple coating process and chitosan material for application as an inactive protective coating for sunblocking applications. Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsMorlando, A., Sencadas, V., Cardillo, D. & Konstantinov, K. (2018). Suppression of the photocatalytic activity of TiO2 nanoparticles encapsulated by chitosan through a spray-drying method with potential for use in sunblocking applications. Powder Technology, 329 252-259. AbstractSolar exposure, in particular to UVA and UVB radiation, is a major carcinogen through direct DNA damage and the production of reactive oxygen species (ROS). Inorganic UV filters present in sunscreening agents, such as titanium dioxide (TiO 2 ), are commonly employed for protection however, due to their photocatalytic nature, they have been shown to instigate the production of ROS when irradiated with UV radiation, which in turn can lead to the degradation of the sunscreening formulation and subsequent damage to the skin. In this work, chitosan/TiO 2 nanocomposite particles were produced via a spray-drying method, in a single step, directly through aqueous solution for the purpose of reducing the photocatalytic activity of commercially available TiO 2 nanoparticles. The photocatalytic activity of the nanocomposite materials were assessed using the organic dye, crystal violet, as the degradation target and irradiating in a UV reactor. It was found that the photoactivity of the chitosan encapsulated nanoparticles were greatly reduced compared to that of the pristine TiO 2 nanoparticles, from 95% degr...

Effects of Different TiO2 Nanoparticles Concentrations on the Physical and Antibacterial Activities of Chitosan-Based Coating Film

“…Furthermore, Morlando et al reported that the thermostability of nanocomposites could be reduced through the addition of TiO 2 NPs. This is probably due to the thermal conductivity of the ceramic TiO 2 NPs, leading to an equal distribution of heat to the samples [54].…”

Reduction of hazardous reactive oxygen species (ROS) production of ZnO through Mn inclusion for possible UV-radiation shielding application

“…ZnO, as one of the inorganic UV-absorbers has been used to formulate UV shielding materials such as sunscreens. Surface modifications such as silica coating [13], impurity doping [14,15], polymer stabilization [16,17], capping agents [18] and metal oxides hetero-composites [1,4,19] have been implemented to tune the photo response properties of ZnO for possible application in reducing the effects of UV absorption.…”

Preparation and characterization of lignin-TiO2 UV-shielding composite material by induced synthesis with nanofibrillated cellulose

“…Inorganic particles are not easily dispersed in creams, which greatly limits their application in skincare products. Morlando et al (2018) utilized the antioxidant properties of chitosan to capture the free radicals generated by the photocatalytic activity of TiO2. However, the prepared chitosan/TiO2 nanocomposite particles had weak UV absorption capacity.…”