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J. Soc. Cosmet. Chem., 42, 87-96 (March/April 1991) Colloid titration' A method to quantify the adsorption of cationic polymer by bleached hair JACQUELINE M. HUTTER, MARY T. CLARKE, ERNST K. JUST, J. L. LICHTIN, and ADEL SAKR, Aqualon Company, Wilmington, DE 19850 (.J.M.H., M.T.C., E.K.J.), and University of Cincinnati College of Pharmacy, Cincinnati, OH 45267 (J.M.H., J.L.L., A.S. ) Received September 12, 1990. Synopsis Colloid titration was validated and used to measure the adsorption of cationic polymer by hair. Cationic polymer uptake by bleached hair was measured indirectly by determining concentration differences in treatment solutions following immersion of hair tresses. Uptake of Polyquaternium-10 cationic hydroxyethylcellulose determined by colloid titration correlated with previously published results for a Polyquaternium-10 measured by radiotracing. Adsorption of cationic hydroxyethylcellulose depended on the degree of damage caused by bleaching hair bleached under harsh conditions showed higher levels of cationic polymer adsorption. Sorption of Polyquaternium-10 increased directly with polymer treatment time and cationic solution concentrations. INTRODUCTION Cationic polymers are widely used in hair product formulations for their ability to modify the condition of hair. Positively charged groups on the polymer are attracted to the negatively charged hair surface and adsorption occurs. An adsorbed polymeric film on the hair surface can lead to improved body and combability. These modifications serve to improve the apparent condition of hair (1). The efficacy of a cationic polymer conditioning treatment is directly related to the amount of polymer deposited on the hair surface from treatment solutions. Most methods for detecting the presence of cationic polymer on hair involve analysis of the hair surface for adsorbed agent (1) and include measurements such as wettability (2), electrophoresis (3), streaming potential (5), and a dye test (6). These tests yield only relative information about the surface conditions of hair quantitative assessment of adsorbed species is not possible. Jacqueline M. Hutter's current address is Helene Curtis Industries, 4401 West North Avenue, Building 3E, Chicago, IL 60639. 87