Noval quaternary ammonium surfactants of potential biocidal activity

ABSTRACT

Five quaternary ammonium compounds were synthesized having the formula [C[9]H[19C[6]H[4]O-[CH[2]CH[2]O][9] -CO-CH[2]CH[2]R][+]Br [I[a-e]] where i[a] r=triethylamine; l[b]r = triethanolamine; l[c]r = hexamine; l[d r=n-methyl diethanolamine and I[c]R = pyridine.Critical micelle concentration [CMC], effectiverness [pi[cmc]], efficiency [P[20]] and maximum surface excess [I[max]] of the novel compounds were calculated using equilibrium surface tension profiles at 25 °C. The biocidal acivity of these compounds were tested on SMC-SRB [stabilized mixed cutlrue of sulphate reducing bacteria isolated from garden soil and enriched using Postage medium B and E]. Minimal inhibitory concentration [mic] for the prepared quaternary ammonium compounds were detected for SMC-SRB using sulphide titrmetric determination method with different concentrations [10-300 ppm], using cetyl trimethyl ammonium bromide [CTAB] as a reference. It was found that triethanolamine and N-methyldiethanolamine derivatives showed the highest biocidal effect