Chinese researchers are developing a wood-based sunscreen formulation as a more sustainable alternative to conventional products.

Two teams from South China University of Technology (SCUT) used lignin as a key ingredient to enhance the SPF effectiveness of sunscreens.

Sunscreens are widely used to protect against ultraviolet (UV) radiation, which can cause skin and eye damage and increase the risk of skin cancer. However, several studies have linked certain sunscreen ingredients to coral reef bleaching and other environmental impacts, sparking interest in bio-based alternatives.

SCUT research found that lignin-based sunscreens can match or exceed the SPF of traditional formulations while maintaining bright color and favorable cosmetic properties.

nanotechnology

In this study, two types of lignin were tested: pale yellow lignin extracted from poplar trees and pale pink lignin extracted from birch. Both materials were milled and processed using ultrasonic extraction before being incorporated into a moisturizing cream formulation.

Lignin from poplar reached SPF 20, while lignin from birch reached SPF 19. To improve performance, the researchers combined lignin with the established UV filters avobenzone and octinoxate to increase the SPF value above 50, the upper label threshold commonly used in commercial sunscreens.

human experiment

Researchers are currently evaluating one of the nanoparticle-based formulations in human trials to assess safety and performance.

Future research will focus on improving UV-shielding properties while preserving “precise structural control” and color.