A Versatile Sunscreen with Minimal ROS Damage and Low Permeability.

Area of Science:

• Materials Science
• Nanotechnology
• Photochemistry

Background:

• Organic and inorganic UV filters have limitations like poor photostability and skin penetration.
• Combining organic and inorganic filters can improve UV protection efficacy.
• Developing safe and effective UV filters is crucial for skin health.

Purpose of the Study:

• To create a novel UV filter system by integrating organic and inorganic components.
• To enhance UV protection while minimizing skin penetration and reactive oxygen species (ROS) generation.
• To evaluate the in vitro and in vivo performance and safety of the new UV filter.

Main Methods:

• Encapsulation of Bi2Ti2O7 nanocomposites (BTO-DSMs) with dendritic silicon dioxide microspheres (DSMs).
• Decoration of BTO-DSMs with organic filters: sinapoyl malate (SM) and baicalin (BS).
• In vitro and in vivo testing for UV protection, ROS scavenging, and skin permeability.

Main Results:

• The BS/BTO-DSM system demonstrated a significantly broadened UV absorption range.
• The inorganic BTO-DSM component prevented direct contact and penetration of the organic filter SM.
• The combined system showed reduced ROS generation, minimal skin permeability, and effective UV protection in vivo.
• No long-term toxicity was observed.

Conclusions:

• The developed BS/BTO-DSM offers superior UV protection by combining organic and inorganic filters.
• This formulation effectively mitigates the limitations of individual UV filters, enhancing safety and efficacy.
• The BS/BTO-DSM shows significant promise as an advanced material for skin protection against UV radiation.