TLDR UV radiation increases protein loss from hair and reduces hair protein quality.
The study demonstrated that exposure to Ultra Violet Radiation (UVR) increased the solubility of hair proteins by cleaving disulfide bonds, leading to higher quantities of soluble proteins and increased sulfhydryl (SH) content in the eluted proteins. UVR also decreased tryptophan fluorescence in these proteins. The research involved hair samples from 17 healthy Caucasian subjects, comparing proximal and distal hair fragments. The distal parts showed more soluble proteins with reduced SH content and tryptophan fluorescence, suggesting that environmental factors, particularly UVR, caused the degradation of hair proteins over time.
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