تسجيل الدخول

تسجيل

Specimen collection and procedures , Effects of cosmetic treatments

المؤلف:  Sue Jickells , Adam Negrusz (Editors)

المصدر:  Clarkes Analytical Forensic Toxicology

الجزء والصفحة:  157

2026-10-04

138

Specimen collection and procedures

Effects of cosmetic treatments

An important issue of concern for drug analysis in hair is the change in the drug concentration induced by the cosmetic treatment of hair. Hair is subjected continuously to natural factors, such as sunlight, weather, water, pollution, etc., which affect and damage the cuticle, but hair cosmetic treatments have been shown to enhance that damage. Particular attention has been focused on the effects of repeated sham pooing, permanent waving, relaxing and dyeing of hair. Repeated shampooing was found to have no significant action on the drug content of hair (Baumgartner and Hill 1992). After cosmetic treatments, drug concentrations decline dramatically by 50–80% from their original concentration. The products used for cosmetic treatments, such as bleaching, permanent waving, dyeing or relaxing, contain strong bases. These reagents may cause hair damage and affect drug content (by loss), or could affect drug stability (Cirimele et al. 1995a).