Evaluation of thermosensitive microspheres as potential components for sun-protectors

Area of Science:

• Materials Science
• Polymer Chemistry
• Photoprotection

Background:

• Thermosensitive polymeric microspheres were developed in previous research.
• Assessing their photoprotective properties is crucial for potential applications.

Purpose of the Study:

• To evaluate the in vitro photoprotective activity of thermosensitive polymeric microspheres.
• To determine the effect of temperature on UV absorption, specifically the UVA/UVB ratio.

Main Methods:

• In vitro evaluation of photoprotective activity.
• Assessment of UVA/UVB ratio at 25°C (shelf temperature) and 45°C (elevated temperature).

Main Results:

• All evaluated polymers exhibited increased UV radiation absorption upon heating from 25°C to 45°C.
• Polymer MS1 demonstrated high efficiency in UVA protection when heated.
• Polymer MS2 showed the most comprehensive protection, absorbing both UVA and UVB radiation at 45°C.
• Polymer MS3 exhibited moderate protection upon heating, influenced by a lipophilic radical.

Conclusions:

• Thermosensitive polymeric microspheres demonstrate temperature-dependent photoprotective capabilities.
• Specific polymers, like MS2, offer significant potential for enhanced UV protection at elevated temperatures.
• The findings support the development of advanced UV-protective materials.