CATIONIC QUATERNARY COMPOUNDS 265 12 10 õ 6 4 2 o 20 40 60 80 Polyquaternium-4 (mg) Intercept = 0.53 Slope = 0.12 r • = 0.99 2O 15 10 5 20 40 60 80 quaternium-26 (mg) Intercept = 1.08 Slope = 0.19 r 2 = 0.99 25 • 20 ca 15 lO 5 20 40 60 80 Stearalkonium Chloride (mg) 25 20 15 lO 5 0 Intercept = 0.15 Slope = 0.28 r • = 0.99 20 40 60 80 Cocodimonium Hydrolyzed Keratin Protein (rag) Intercept = 0.61 Slope -- 0.27 r • = 0.99 15 20 40 60 80 Laurdimonium Hydrolyzed Wheat Protein (rag) Intercept = 0.36 Slope = 0.14 r • = 0.99 Figure 2. Calibration curves showing the linearity ooe polyquatemium-4, stearalkonium chloride, quater- nium-26, cocodimonium hydrolyzed keratin protein, and laurdimonium hydrolyzed wheat protein titrated with SDS.

266 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS 10 4 O.O•J% 0.10% 0.20% 14- 12 10 8 6 -- 0.0•% 0.10% 0.20% 12 0.05% 0.10% 0.20% Figure 3. The effect of solution concentration of polyquaternium-4, laurdimonium hydrolyzed wheat protein, and quaternium-26 on cationic uptake by bleached hair.