Forensic chemical study on human hair. I. Identification of brand of hair care products by components remaining on human hairs. (1).

Abstract

Identification of brand of hair care products (hair liquids, hair tonics, hair shampoos and hair rinses) by components remaining on human hair was investigated. They were identified by GC and GC-MS analyses after extraction with ether. Hair liquid of 57 brands produced by 17 companies were grouped into 21 classes on the basis of components remaining on human hair, and among them hair liquids of 11 brands were identified by peculiar components. Major components of hair liquids on human hair were able to be detected even 5 d after the treatment. However, remaining components of hair tonics were detected only 4 brands of 4 companies (in hair tonics of 51 brands of 14 companies). Three brands among them were identified even if used together with hair liquids because their remaining components did not overlap with those of hair liquids. Main components of those 4 brands hair tonics on human hair were able to be detected after 10 d. Remaining components were detected in only 1 brand of hair rinse among 20 brands of hair shampoo and hair rinse, and it was identified because the components differ from those of hair liquids and hair tonics. Therefore, the brands of hair tonics, hair rinse and some of hair liquids were identified if major components were detected from treated hairs.