Fig. 5.

High-performance thin-layer chromatography (HP-TLC) analysis of ultraviolet (UV) light irradiated hair samples. The Asian hair had more integral hair lipids than the other hairs. In particular, the free fatty acid content was higher than those of the other lipids. UV irradiation resulted in decreased lipid content, especially free fatty acids. (A) Amount of integral hair lipids between ethnic groups. (B) Integral hair lipids after UV radiation. S, standard; Control, #11, #21, #31; UVA 12 hr, #12, #22, #32; UVA 48 hr, #13, #23, #33; UVB 12 hr, #14, #24, #34; UVB 48 hr, #15, #25, #35.