The influence of the pH on the stability and stoichiometry of the complexes formed by carboxylic-antibiotics such as grisorixin, alborixin and monensin with alkaline and alkaline earth cations has been investigated. The maximum values of bimolecular lipid membrane conductance are obtained with grisorixin and potassium ion. The conductance-pH curves show a very pronounced maximum in the neutral pH range. The results are analysed on the basis of a dimeric form of the ionophore in the complex and the possibility of having several charged complexes resulting from an heterogeneous reaction, the number of each complexed form depending on the pH of the bulk solutions.

译文

:已经研究了pH对由羧基抗生素(如格氏毒素,阿尔法毒素和莫能菌素)与碱金属和碱土金属阳离子形成的配合物的稳定性和化学计量的影响。用grisorixin和钾离子可获得双分子脂质膜电导的最大值。电导-pH曲线在中性pH范围内显示出非常明显的最大值。基于复合物中离子载体的二聚体形式以及由于异质反应而产生几种带电复合物的可能性来分析结果,每种复合形式的数量取决于本体溶液的pH。

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