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Interaction of Ampicillin and Amoxicillin with Mn2+: A Speciation Study in Aqueous Solution

机译:氨苄青霉素和阿莫西林与Mn2 +的相互作用:水溶液中的一种物种研究

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摘要

A potentiometric and UV spectrophotometric investigation on Mn -ampicillin and Mn -amoxicillin systems in NaCl aqueous solution is reported. The potentiometric measurements were carried out under different conditions of temperature (15 ≤ /°C ≤ 37). The obtained speciation pattern includes two species for both the investigated systems. More in detail, for system containing ampicillin MLH and ML species, for that containing amoxicillin, MLH and MLH ones. The spectrophotometric findings have fully confirmed the results obtained by potentiometry for both the systems, in terms of speciation models as well as the stability constants of the formed species. Enthalpy change values were calculated via the dependence of formation constants of the species on temperature. The sequestering ability of ampicillin and amoxicillin towards Mn was also evaluated under different conditions of pH and temperature via pL empirical parameter (i.e., cologarithm of the ligand concentration required to sequester 50% of the metal ion present in traces).
机译:据报道了NaCl水溶液中Mn-andillin和Mn-oxicillin系统的电位和紫外分光光度研究。电位测量在不同的温度条件下进行(15≤/°C≤37)。所获得的物种模式包括调查系统的两种物种。更详细地,对于含有氨苄青霉素MLH和ML物种的系统,对于含有阿莫西林,MLH和MLH含量的系统。分光光度法发现通过物种模型以及所形成的物种的稳定性常数,通过对系统的电位测量来完全证实了通过电位测量获得的结果。通过在温度下形成常数的依赖性来计算焓变化值。在PH和温度的不同条件下,通过PL经验参数(即,在迹线中除去50%的金属离子所需的配体浓度的水域,在不同的pH和温度条件下评估氨苄青霉素和Amoxicillin朝向Mn的螯合能力。

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