Separation of rare earth ions by precipitation during electromigration

Deman, Joris

doi:10.1021/ac60291a002

Cited by 16 publications

(16 citation statements)

References 9 publications

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“…In 1970, Deman et al [19,20] advanced the important concepts of ''precipitate reaction front'' and ''moving reaction front.'' At the same time, Deman [21,22] observed the elution displacement of metal ions and the separation of six rare earth ions in his experiments. In 1990s, the idea of equivalent electromigration reaction between H 1 and OH À was developed for protein concentration [23].…”

Section: Introductionmentioning

confidence: 92%

Equivalence‐point electromigration acid–base titration via moving neutralization boundary electrophoresis

Yang¹,

Fan²,

Shan-sheng³

et al. 2011

Electrophoresis

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In this paper, we developed a novel method of acid-base titration, viz. the electromigration acid-base titration (EABT), via a moving neutralization boundary (MNR). With HCl and NaOH as the model strong acid and base, respectively, we conducted the experiments on the EABT via the method of moving neutralization boundary for the first time. The experiments revealed that (i) the concentration of agarose gel, the voltage used and the content of background electrolyte (KCl) had evident influence on the boundary movement; (ii) the movement length was a function of the running time under the constant acid and base concentrations; and (iii) there was a good linearity between the length and natural logarithmic concentration of HCl under the optimized conditions, and the linearity could be used to detect the concentration of acid. The experiments further manifested that (i) the RSD values of intra-day and inter-day runs were less than 1.59 and 3.76%, respectively, indicating similar precision and stability in capillary electrophoresis or HPLC; (ii) the indicators with different pK(a) values had no obvious effect on EABT, distinguishing strong influence on the judgment of equivalence-point titration in the classic one; and (iii) the constant equivalence-point titration always existed in the EABT, rather than the classic volumetric analysis. Additionally, the EABT could be put to good use for the determination of actual acid concentrations. The experimental results achieved herein showed a new general guidance for the development of classic volumetric analysis and element (e.g. nitrogen) content analysis in protein chemistry.

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Section: Introductionmentioning

confidence: 92%

Equivalence‐point electromigration acid–base titration via moving neutralization boundary electrophoresis

Yang¹,

Fan²,

Shan-sheng³

et al. 2011

Electrophoresis

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“…The concept of moving reaction boundary (MRB) has been formally developed during the last decade. Up to now, four MRB systems have been well developed, including the moving precipitate boundary (MPB), [51][52][53][54][55] the moving neutralization boundary (MNB), [55][56][57] the moving chelation boundary (MCB) 55,58 and the moving supramolecular boundary (MSB). 55,59 The MRB had some interesting uses in separation and analytical sciences.…”

Section: Introductionmentioning

confidence: 99%

Moving affinity boundary electrophoresis and its selective isolation of histidine in urine

Jia

Zhang

Cao

et al. 2010

Analyst

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Affinity analysis is a key biotechnique used in the fields of biology and biomedicine. Herein, we advanced the concept of moving affinity boundary (MAB) using metal ion Ni(II) and histidine (His) as the model inorganic ion and ligand, respectively, developed the simple method of MAB affinity capillary electrophoresis (MAB-ACE), and carried out the relative experiments. The experiments manifested that (a) an MAB could be created with the model metal ion and ligand; (b) the MAB-ACE could specifically capture His rather than other amino acids, or numerous metabolites in human urine; and (c) the capture had the merits of simultaneous focusing and separation to the target metabolite of His. It was further revealed that the specificity of MAB-ACE was originated from the selective affinity interaction and the effective control of affinity conditions. The analyses of His in raw urine by the MAB-ACE are in agreement with those via the standard amino acid analyzer, indicating the reliability of the developed method. Additionally, the MAB-ACE with UV detector had good sensitivity (LOD = 43 ng mL(-1), S/N = 3), 1.0-150 microM linearity and <5% intra-/inter-day variations. The novel method has an evident potential application for capture of a target metabolite in complex biological sample.

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“…The main characteristic and trait of MRB is the presence of the reaction such as the neutralization reaction between hydrogen ion and hydroxyl ion, the chelation reaction between the chelator and metal ions, the precipitate reaction between metal ions and hydroxyl ion, the affinity reaction between Ni(II) and histidine, and so on. In 1970, Deman and Rigole [34][35][36][37] advanced the important ideas of the 'precipitate reaction front' and 'moving reaction front' (MRF), developed the concept of elution boundary (EB) and performed the EB-induced separation of metal ions in a MRF. In 1993, Pospichal et al 38 advanced the concept of stationary neutralization boundary in electrofocusing apparatus of CE.…”

Section: Introductionmentioning

confidence: 99%

“…In 1997-2008, Cao et al [39][40][41] developed the concept of MRB for isoelectric focusing (IEF) and sample stacking in CE. Up to now, six kinds of MRB systems have been developed by the authors, including the moving precipitate boundary, [34][35][36][37]39 moving neutralization boundary, [38][39][40][41] moving chelation boundary (MCB), 40,42 moving oxidation-reduction boundary 40,43 and moving affinity boundary 44 as well as moving supramolecular or interaction boundary. 40,45 A novel MRB-based ITP mode has been observed in the experiments on MCB.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental studies on isotachophoresis in multi-moving chelation boundary system formed with metal ions and EDTA

Zhang

Guo

Fan

et al. 2013

Analyst

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In this paper, a general mode and theory of moving chelation boundary based isotachophoresis (MCB-based ITP), together with the concept of decisive metal ion (DMI) having the maximum complexation constant (lg Kmax) with the chelator, were developed from a multi-MCB (mMCB) system. The theoretical deductions were: (i) the reaction boundary velocities in the mMCB system at steady state were equal to each other, resulting in a novel MCB-based ITP separation of metal ions; (ii) the boundary directions and velocities in the system were controlled by the fluxes of chelator and DMI, rather than other metal ions; and (iii) a controllable stacking of metal ions could be simultaneously achieved in the developed system. To demonstrate the deductions, a series of experiments were conducted by using model chelator of EDTA and metal ions of Cu(II) and Co(II) due to characteristic colors of blue [Cu-EDTA](2-) and pink [Co-EDTA](2-) complexes. The experiments demonstrated the correctness of theoretical deductions, indicating the validity of the developed model and theory of ITP. These findings provide guidance for the development of MRB-based ITP separation and stacking of metal ions in biological sample matrix and heavy metal ions in environmental samples.

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Separation of rare earth ions by precipitation during electromigration

Cited by 16 publications

References 9 publications

Equivalence‐point electromigration acid–base titration via moving neutralization boundary electrophoresis

Equivalence‐point electromigration acid–base titration via moving neutralization boundary electrophoresis

Moving affinity boundary electrophoresis and its selective isolation of histidine in urine

Theoretical and experimental studies on isotachophoresis in multi-moving chelation boundary system formed with metal ions and EDTA

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