Amidoamine double tailed cationic surfactant based on dimethylaminopropylamine: Synthesis, characterization and evaluation as biocide

Three amidoamine cationic surfactants with double tailed were prepared and their chemical structures was confirmed using spectroscopic analysis like FTIR and 1H NMR. The surface parameters of the amidoamine surfactants were determined from surface tension and conductance measurements. The double tailed amidoamine surfactant shown low critical micelle concentration than conventional surfactants with their dependence on chain length and temperatures. Thermodynamic parameters clarified the tendency of surfactants to adsorb at interface than to form micelle and both of the two processes depend on the alkyl chain and temperature. The prepared surfactants were evaluated against microorganism showing that they have good biological activity against both Gram positive and negative bacteria but they have no effect on fungi.