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首页> 外文期刊>Journal of industrial and engineering chemistry >Characterization, surface properties and biological activity of new prepared cationic surfactants
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Characterization, surface properties and biological activity of new prepared cationic surfactants

机译：新型阳离子表面活性剂的表征，表面性质和生物活性

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摘要

Three cationic surfactants were prepared. A condensation reaction between dimethylaminopropylamine (DMAPA) and benzaldehyde was performed. The produced Schiff base was quaternization with three fatty alkyl bromide with different carbon chain length separately to form the desired cationic surfactants. The chemical structure of synthesized cationic surfactants was confirmed by FT1R, ~1H NMR and mass spectroscopy. It was found that the chemical structure of prepared compounds has an effect on surface properties, where increasing the hydrophobic chain length decrease the values of CMC, Γ_(max) while A_(min) value was increased. The thermodynamic parameters showed that adsorption and micellization processes are spontaneous. It is clear that the prepared cationic surfactants at first tend to adsorb at surface, then it aggregate to form micelle. The prepared surfactants showed good biological activity against gram positive and negative bacteria and fungi in the following order of II (C12) >I (C10) >III (C16). The serial dilution method was used to evaluate the inhibiting effect of these compounds on the sulfate reducing bacteria growth.
机译：制备了三种阳离子表面活性剂。进行了二甲基氨基丙胺（DMAPA）和苯甲醛之间的缩合反应。用三种具有不同碳链长度的脂肪烷基溴化物分别将产生的席夫碱季铵化，以形成所需的阳离子表面活性剂。 FT1R，〜1H NMR和质谱证实了合成的阳离子表面活性剂的化学结构。发现所制备化合物的化学结构对表面性质有影响，其中增加疏水链长度降低CMC值，Γ_（max）而增加A_（min）值。热力学参数表明吸附和胶束化过程是自发的。显然，制得的阳离子表面活性剂起初倾向于在表面吸附，然后聚集形成胶束。所制备的表面活性剂对革兰氏阳性和阴性细菌和真菌具有良好的生物学活性，其顺序为II（C12）> I（C10）> III（C16）。使用系列稀释法评估这些化合物对硫酸盐还原菌生长的抑制作用。

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