Quantification of Bleached Hair Damage by Streaming Potential Method and Tracking of Adsorption of Cationic Cellulose

Abstract

Changes in the chemical composition of the hair surface due to damage can be analyzed using infrared spectroscopy. However, since hair damage repair is performed at the solid-liquid interface, it is important to evaluate the surface properties in a water-containing state in order to understand the interaction with the repair agent. That is, if the zeta potential on the hair surface can be evaluated easily and reproducibly, it will lead to quantification of hair damage and can be used as a screening method for the repairing effects of various reagents on hair. Therefore, in this study, we evaluated the surface characteristics of bleached hair in liquid and tracked the adsorption behavior of cationic cellulose by zeta potential measurement using the streaming potential method as the measurement principle. It was possible to quantify damage because there was a high correlation between the bleaching time, the absorbance of the wave number derived from cysteic acid by ATR, and the isoelectric point obtained from the pH-dependent curve of the zeta potential. In the tracking of the adsorption behavior of cationic cellulose, there was a negative correlation between the bleaching time and the adsorption rate, suggesting that the degree of adsorption of the repair agent can be estimated using the streaming potential method.