The interaction between the L-aspartic acid (L-Asp) and SDS was studied by the determination of surface tension and conductivity and the method of cyclic voltammetry. The results indicate that the L-Asp can decrease the critical micellar concentration, but increase the aggregation numbers of SDS micelles. The admicelles of SDS formed on the electrode can make the catalytic efficiency for electrochemical oxidation of L-Asp first increase, then decrease. However, addition of n-C₄H₉OH can adjust the catalytic efficiency.

Key words: sodium dodecyl sulfate, L-aspartic acid, micelle, admicelle