Comparison of Near Infrared Spectra of Three Lichen Substances and Several Common Synthetic Organic Sunscreens

Compounds with hydroxyl, carbonyl groups, medium-length aliphatic chains, and low degree of aromatic substitution may provide NIR photoprotection. Owing to their antioxidant properties, lichen compounds are better alternatives. NIR spectroscopy is also suitable for quantification and quality control of sunscreens due to their high concentrations in finished products. However, there is still a need to develop or discover new organic sunscreens with strong NIR absorption.