2010 TRI/PRINCETON CONFERENCE 211 PROCEDURE—SOLUTION PREPARATION: (1) Prepare 50g of a 10% active test solution of surfactant. Record pH. The surfactants are sodium lauryl sulfate and sodium laureth sulfate. Ingredient w/w Surfactant 34.00% Distilled water 65.50% Combine the ingredients listed with slow to medium agitation. Mix until uniform at 20°-25°C. Prepare test solutions for both SLS and SLES (10% active SLS and 10% active SLES). (2) Prepare 100 g of a 10% active test solution for each quat sample. Table I Compounds Studied Name R1 R2 R3 Description AMB Alkyl (C 12) CH3 Benzyl Coco dimethyl benzyl ammonium chloride AME Alkyl (C 12) CH2CH2OH CH3 Coco di-2 hydroxyethyl methyl ammonium chloride AMG Alkyl (C 12) CH3 Glyceryl Coco dimethyl glyceryl ammonium chloride AMM Alkyl (C 12) CH3 CH3 Coco tri-methyl ammonium chloride AEB Alkyl (C 12) CH2CH2OH Benzyl Coco di-2 hydroxyethyl benzyl ammonium chloride AEG Alkyl (C 12) CH2CH2OH Glyceryl Coco di-2 hydroxyethyl glyceryl ammonium chloride CaMB Castor amido CH3 Benzyl Ricinoleylamidopropyl dimethyl benzyl ammonium chloride CaMG Castor amido CH3 Glyceryl Ricinoleylamidopropyl dimethyl glyceryl ammonium chloride DMB Dimer amido CH3 Benzyl Dilinoleylamidopropyl dimethyl benzyl ammonium chloride DMG Dimer amido CH3 Glyceryl Dilinoleylamidopropyl dimethyl glyceryl ammonium chloride DMM Dimer amido CH3 CH3 Dilinoleylamidopropyl trimethyl ammonium chloride MMB Cocamido CH3 Benzyl Cocamidopropyl dimethyl benzyl ammonium chloride MMG Cocamido CH3 Glyceryl Cocamidopropyl dimethyl glyceryl ammonium chloride MMM Cocamido CH3 CH3 Cocamidopropyl trimethyl ammonium chloride

JOURNAL OF COSMETIC SCIENCE 212 Preparation of 10% active quat: Ingredient w/w Stock quat solution (35% w/w) 28.50% Distilled water 71.50% Combine ingredients listed with slow to medium agitation. Mix at 20°-25°C until uni- form. Then, (1) Using a hot plate and stir bar set on medium agitation, slowly titrate surfactant test solution with quat solution using a 5-ml disposable pipette, at a rate of one drop per second. Continue adding quat solution until a precipitate is observed (subjective evaluation). (2) The solution will appear cloudy and translucent at this point. Record the amount (grams) of quat solution added at the cloud point, fi nal pH, and the viscosity. Repeat for remaining quat solutions. Store at 20°-25°C. Observe solutions after 24 hours. If solution remains cloudy, then titration is complete. If solution is clear, then repeat step 2. Perform titration for each quat using SLS and SLES individually. Titration data is shown in Tables II–V. Calculations grams of quat added %Quat added (50 grams of quat added) = ´100 + Table II Titration Data (SLS) Quat Sample Amount of quat solution added to achieve haze point in SLS (g) Final pH Viscosity (cps) Notes AMB 9.75 7.6 4,400 Formed an opaque, pearlescent gel beyond the haze point AME 6.28 7.1 10 Did not form a gel AMG 30.49 8.1 10 Did not form a gel AMM 17.63 7.8 10 Did not form a gel AEB 14.58 7.9 10 Did not form a gel AEG 29.53 7.7 10 Did not form a gel CaMB 25.72 7.6 1,000 Formed a gel CaMG 44.47 7.1 1,000 Formed a gel DMB 18.33 7.6 10 Did not form a gel DMG 40.25 7.6 12,000 Formed a gel DMM 23.85 7.6 6,000 Formed a gel MMB 15.28 7.4 14,000 Formed a gel MMG 31.02 8.0 13,000 Formed a gel MMM 21.25 8.0 13,400 Formed a gel