Abstract:

Poly(N,N-diallyl-N-carbobutoxymethylammonium chloride)(PDACBMAC) was prepared from N,N-diallyl-N-carbobutoxymethylammonium chloride(DACBMAC) as monomer and ammonium peroxydisulfate(APS) as initiator in water solution, and its structure was characterized by FT-IR and ¹H NMR. The sterilizating property of PDACBMAC against Escherichia coli(E.coli) and its antimicrobial mechanism were also studied. The results show that the sterilizating potency of PDACBMAC against E.coli is obviously higher than that of poly(dimethyldiallylammonium chloride)(PDMDAAC) and slightly higher than that of dodecyldimethylbenzylammonium chloride(DDBAC) when the dosage is below 20 mg/L, and the bactericidal ratio is up to 99.7% when the intrinsic viscosity of PDACBMAC is 1.371 dL/g and the dosage is 30 mg/L. The bactericidal ratio is affected obviously by pH value, which increases with increasing pH in a range of 4.7~6.7, and decreases with increasing pH when pH＞6.7. The results of testing turbidity for the treated water sample show that PDACBMAC still possesses an excellent coagulation property. The results of measuring activities of the enzyme of β-D-galactosidase show that the antimicrobial mechanism of PDACBMAC is based on a sterilization action.

Key words: poly(N,N-diallyl-N-carbobutoxymethylammonium chloride), sterilizing property, antimicrobial mechanism, Escherichia coli