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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Mass spectrometry and potentiometry studies of Pb(II)-, Cd(II)- and Zn(II)-cystine complexes
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Mass spectrometry and potentiometry studies of Pb(II)-, Cd(II)- and Zn(II)-cystine complexes

机译:Pb(II)-,Cd(II)-和Zn(II)-胱氨酸复合物的质谱和电位法研究

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摘要

Cd(II)-, Pb(II)- and Zn(II)-cystine complexes were investigated by potentiometric and different mass spectrometric (MS) methodologies. Laser desorption mass spectrometry has provided both the composition and structure of metal-cystine complexes according to the speciation models proposed on the basis of the potentiometric data. Detection of neutral complexes was achieved by protonation or electrochemical reduction during mass spectrometric experiments. The redox activity of metal-cystine complexes was confirmed by laser desorption and charge transfer matrix assisted laser assisted MS experiments, which allowed us to observe the formation of complexes with a reduction of cystine. The stoichiometry of Cd(II)-, Pb(II)- and Zn(II)-cystine complexes was defined by observing the isotopic pattern of the investigated compound. The results suggest that interaction occurs through the carboxylate group of the ligand.
机译:镉(II)-,铅(II)-和锌(II)-胱氨酸复合物通过电位和不同的质谱(MS)方法进行了研究。激光解吸质谱法根据电位计数据提出的形态模型,提供了金属-胱氨酸络合物的组成和结构。在质谱实验过程中,通过质子化或电化学还原可检测中性配合物。金属-胱氨酸复合物的氧化还原活性通过激光解吸和电荷转移基质辅助的激光辅助质谱实验得以证实,这使我们能够观察到胱氨酸还原后复合物的形成。 Cd(II)-,Pb(II)-和Zn(II)-胱氨酸复合物的化学计量是通过观察所研究化合物的同位素模式确定的。结果表明相互作用通过配体的羧酸酯基发生。

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