Effect of Aminoacids on the Critical Micellization Concentration
of Different Surfactants

N. G. Arutyunyan^a,b, L. R. Arutyunyan^a, V. V. Grigoryan^a, and R. S. Arutyunyan^a

^a Yerevan State University, ul. A. Manukyana 1, Yerevan, 375049 Armenia

^b Vanadzor State Pedagogical Institute, ul. T. Metsa 36, Vanadzor, 377200 Armenia

Received May 18, 2007

Abstract—The effect of aminoacids (DL-glycine, DL-alanine, DL-serine, L-leucine, L-lysine, DL-phenylala-
nine, DL-tyrosine, and L-aspartic acid) on the critical micellization concentration (CMC) of nonionic, anionic,
and cationic surfactants is investigated. It is established that, as the hydrophobicity of aminoacids rises, the
CMC values of ionic and nonionic surfactants increase and decrease, respectively. An exception is aspartic acid,
which reduces CMC values irrespective of the nature of surfactants.

DOI: 10.1134/S1061933X08050177

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