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Novel quaternary ammonium surfactants of potential biocidal activity [electronic resource].

By:

Morsy, S. M. I

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Language: English Summary language: Arabic Description: P. 29-40Other title:

الخواص البيلوجية المثبطة لأنواع مستخدمة من المواد ذات نشاط سطحى محتوية على نيتروجين رباعى التكافؤ [Added title page title]

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Egyptian journal of microbiology, 2004 v.39 (1-2) [electronic resource].

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In: Egyptian Journal of Microbiology 2004.V.39(1-2)Summary: Five quaternary ammonium compounds were synthesized having the formula: where La; R = triethylamine; Ib: R = triethanolamine; Ie: R = hexamine; Id: R = N-methyl diethanolamine and Ie: R = pyridine. Critical micelle concentration (CMC), effectiveness (1tcmJ, efficiency (PC20) and maximum surface excess (Tmax) of the novel compounds were calculated using equilibrium surface tension profiles at 25°C. The biocidal activity of these compounds were tested on SMC-SRB (stabilized mixed culture of sulphate reducing bacteria isolated from garden soil and enriched using Postgate 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 (I 0-300ppm), using cetyl trimethyl ammonium bromide (eTAS) a s a reference. It was found that triethanolamine and N-methyldiethanolamine derivatives showed the highest biocidal effect.

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Five quaternary ammonium compounds were synthesized having the formula: where La; R = triethylamine; Ib: R = triethanolamine; Ie: R = hexamine; Id: R = N-methyl diethanolamine and Ie: R = pyridine. Critical micelle concentration (CMC), effectiveness (1tcmJ, efficiency (PC20) and maximum surface excess (Tmax) of the novel compounds were calculated using equilibrium surface tension profiles at 25°C. The biocidal activity of these compounds were tested on SMC-SRB (stabilized mixed culture of sulphate reducing bacteria isolated from garden soil and enriched using Postgate 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 (I 0-300ppm), using cetyl trimethyl ammonium bromide (eTAS) a s a reference. It was found that triethanolamine and N-methyldiethanolamine derivatives showed the highest biocidal effect.

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