Chemometric Analysis of Voltammetric Data on Metal Ion Binding by Selenocystine

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• 作者：Rui Gusm茫o ; Jos茅 Manuel D铆az-Cruz ; Cristina Ari帽o ; Miquel Esteban
• 刊名：The Journal of Physical Chemistry A
• 出版年：2012
• 出版时间：June 28, 2012
• 年：2012
• 卷：116
• 期：25
• 页码：6526-6531
• 全文大小：379K
• 年卷期：v.116,no.25(June 28, 2012)
• ISSN：1520-5215

文摘

The behavior of selenocystine (SeCyst) alone or in the presence of various metal ions (Bi³⁺, Cd²⁺, Co²⁺, Cu²⁺, Cr³⁺, Ni²⁺, Pb²⁺, and Zn²⁺) was studied using differential pulse voltammetry (DPV) over a wide pH range. Voltammetric data matrices were analyzed using chemometric tools recently developed for nonlinear data: pHfit and Gaussian Peak Adjustment (GPA). Under the experimental conditions tested, no evidence was found for the formation of metal complexes with Bi³⁺, Cu²⁺, Cr³⁺, and Pb²⁺. In contrast, SeCyst formed electroinactive complexes with Co²⁺ and Ni²⁺ and kinetically inert but electroactive complexes with Cd²⁺ and Zn²⁺. Titrations with Cd²⁺, Co²⁺, Ni²⁺, and Zn²⁺ produced data that were reasonably consistent with the formation of stable 1:1 M(SeCyst) complexes.