68 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS SL$/Skin / 0.9% NaCI • // 1.5 E ).. SLS/ Skin/SLS / ß ß 0.5 ,,•"•/ ß 0 I I I I I I 0.1 0.2 0.3 0.4 0.5 0.6 CONCENTRATION OF SODIUM LAURYL SULFATE [W,/W. %} Figure 2. The dependence of conductivity on sodium lauryl sulfate (SLS) concentration in the systems: (©) SLS alone, (&) SLS/skin/SLS, and (1•) SLS/skirf0.9% NaCI.

CONDUCTIVITY OF SKIN IN DETERGENT SOLUTIONS 69 to the fact that conductivity across the skin in the SLS/skin/0.9% NaCI system is mainly controlled by sodium and chloride ions. Therefore, the shift arising from the formation of micelies in the SLS/skin/SLS system disappeared. EFFECT OF SLS CONCENTRATION ON BARRIER EFFECT Figure 3 shows the effect of SLS concentration on the resistance of skin treated with cream D. A dimensionless normalized resistance profile, defined as: Rnormalized = Rt/R c (5) O3% SLS 0.• % SLS 0.5 % S LS 0.2 % SLS 'Hme(min) Figure 3. The effect of sodium lauryl sulfate (SLS) concentration on the resistance of skin after treatement with cream D. (.) 0.1%, (•) 0.2%, (') 0.3%, (B) 0.4%, and (O) 0.5%.

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