Mixed Stability and Antimicrobial Properties of Gluconamide-Type Cationic Surfactants

The stability of anionic-cationic surfactant solutions and the antimicrobial properties of novel N , N -dimethyl- N -[3-(gluconamide/lactobionamide)]propyl- N -alkylammonium bromides (CnDGPB and CnDLPB), N -methyl- N -hydroxyethyl group- N -[3-(gluconamide)-propyl]- N -alkylammonium bromide (CnMHGPB) and star-shaped gluconamide-type cationic surfactants N -dodecyl- N , N -bis[(3- d -gluconylamido)propyl]- N -alkylammonium bromide (CnDBGB) were investigated. Mixed stability in combination with sodium n -alkylbenzenesulfonate (LAS) was determined via transmittance; stability is achieved when percent transmittance was greater than 90 %. Transmittance results suggest that these cationic surfactants can form stable solutions with anionic surfactants over a broad concentration range. The inhibition activity of C n DBGB is the best among the three kinds of glucocationic surfactants. Antimicrobial activity of C 12 surfactants was the best, C 14 was the second and C 10 was the worst. Moreover, antibacterial activity of glucose-based cationic surfactants was greater than lactose-based cationic surfactants.