Abstract
A new amphoteric betaine-type surfactant of 3- (N' -acyl) -aminopropyl-N, N-dimethyl-N-carboxymethyl betaine (Cn-APNB) was prepared, whose biodegradation and hydrolysis pose no environmental problems. The physicochemical properties and surface activities such as critical micelle concentration (cmc), surface tension, foaming power, sedimentation and surface potential (adsorption) of TiO2 particles in the presence of the surfactant were measured and biodegradability and antimicrobial features were also evaluated. The mixed system of Cn-APNB with soap exhibited synergistic effect on surface tension and foaming power at a weight ratio of 1 : 9. Antimicrobial activity forward Escherichia coli and Enterococcus was weakened by the introduction of an amidopropyl group and effects on the aquatic environment were minimized.
