New alquil amide type cationic surfactants from arginine

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Eulàlia Piera, Francisco Comelles, Pilar Erra and Ma Rosa Infante


Abstract

The synthesis, stability, surface activity and antimicrobial properties of a new family of cationic surfactants (the long chain arginylalkylamide dihydrochloride salts) derived from the condensation of the amino acid arginine and a long chain alkylamine are described. The surface active parameters reported are c.m.c. (critical micellar concentration), pC20 (negative log of the surfactant molar concentration required to reduce the surface tension of the solvent by 20 mN m–1), γc.m.c. (the surface tension at the c.m.c.), Γmax (the maximum surface excess concentration) and Amin (the minimum area per surfactant molecule at the interface). These data and those obtained from the evaluation of the antimicrobial properties are compared with the data corresponding to another family of cationic surfactants reported earlier by our group: the long chain N[hair space] α-acylarginine methyl ester salts.

Moreover, the synthesis of analogues possessing a reactive group capable of bonding to wool or cotton fibres is described: the long chain N[hair space]α-dichlorotriazinylarginylalkylamide monohydrochloride salts. We expect these compounds to bond to the textile substrate by the formation of a covalent bond. Confirmation of this is, however, necessary.


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