Evaluation of weak ion association between tetraalkylammonium ions and inorganic anions in aqueous solutions by capillary zone electrophoresis

Mbuna, Julius; Takayanagi, Toshio; Oshima, Mitsuko; Motomizu, Shoji

doi:10.1016/j.chroma.2003.09.051

Cited by 25 publications

(28 citation statements)

References 29 publications

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“…Weak ion association between inorganic anions and tetraalkylammonium ions in aqueous solutions using neutral coated capillary has already been reported [24]. Similar interactions were later examined in aqueous-ethanol mixed solutions [25] using an ordinary silica capillary, in which the association constants showed a modest increase with an increase in the proportion of ethanol in the migrating buffer.…”

Section: Introductionmentioning

confidence: 74%

“…If association of ions was solely dependent on dielectric constant, ion association carried out in aqueous-methanol migrating electrolyte and aqueous-dioxane media would have been accompanied by substantial differences in K ass . Earlier works [17], [24,25] have shown that K ass generally affected by the size of the alkyl group as well as type of media. It can be suggested that association is a complicated process which is affected by factors other than dielectric friction and electrostatic interactions.…”

Section: Bjerrum's Theory and Inorganic Anions-tetraalkylammonium Ionmentioning

confidence: 99%

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Capillary zone electrophoretic studies of ion association between inorganic anions and tetraalkylammonium ions in aqueous–dioxane media

Mbuna

Takayanagi

Oshima

et al. 2005

Journal of Chromatography A

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Ion association between inorganic anions and symmetrical tetraalkylammonium ions, R 4 N + (R = Me, Et, Pr, n-Bu, n-Am, and 2-methyl butyl {isoamyl=iAm}) was investigated using ordinary silica capillary by capillary zone electrophoresis. An improved version of the Williams-Vigh method was used for the first time to measure the mobilities of the inorganic anions. Plots of log K ass against log dielectric constant in various media, revealed a smaller change in K ass compared to dielectric constant. These plots suggest that the Bjerrum's equation is inadequate in accounting for the associations of ions in a CZE setup.

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Section: Introductionmentioning

confidence: 74%

Section: Bjerrum's Theory and Inorganic Anions-tetraalkylammonium Ionmentioning

confidence: 99%

Capillary zone electrophoretic studies of ion association between inorganic anions and tetraalkylammonium ions in aqueous–dioxane media

Mbuna

Takayanagi

Oshima

et al. 2005

Journal of Chromatography A

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“…Operating with available or calculated structural descriptors, e.g., the formal charge, metal atom electronegativity (or effective charge), ligand number, etc., the developed quantitative structure-mobility relationships were shown to yield consistent mobility approximations for various types of inorganic and organic ligand complexes. Motomizu and co-workers [63] compared the validity of different theoretical models for approximation of the mobilities of inorganic anions and found that they appeared to follow Hückel's model, operating with the Stokes' radius, more closely than the more advanced Zwanzig and Hubbard-Onsager models. To add to a database gathering electrophoretic mobilities of ions, the absolute mobility of Np(V) was determined at infinite dilution using the Debye-Hückel-Onsager's equation and ICP-MS as CE detection technique [64].…”

Section: Mobilitymentioning

confidence: 96%

“…Separation of Elbe-bream liver cytosol sample using CE-ICP-MS. Capillary: 70 cm675 mm ID fusedsilica; BGE, 100 mM tricin-NH 3 , pH 7.2. CE conditions: voltage, 30 kV; sample introduction, pressure, 2 kPa?s; temperature, 157C; detection, ICP-MS (isotopes monitored 63 Cu, 64 Zn, 114 Cd). Reprinted from [116], with permission.…”

Section: Speciation Analysismentioning

confidence: 99%

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Capillary electrophoresis of inorganic ions: An update

Timerbaev

2004

Electrophoresis

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This review as a sequel of three earlier similar reports gives a summary of the progress and significant methodological developments, starting from 2002, in the use of capillary electrophoresis (CE) for inorganic ion analysis. As substantiated by the illustrative number of relevant references, improvements in sensitivity achieved both in and outside a CE system, advances in manipulating the separation selectivity, novel hardware configurations, and system performance innovations are continually being reported over the review period. Specifically viewed are the recent advancements in elemental (bio)speciation analysis, which remains one of the most fertile areas of CE research, as well as in three recently booming research topics: contactless conductivity detection, separations on microchips, and transient isotachophoretic preconcentration. A state-of-the-art picture of technique's potentialities within the field of interest presented here demonstrates that CE has become recognized and is growing in acceptance as a reliable alternative to traditional analytical methods such as high-performance liquid chromatography (HPLC).

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Recent applications of affinity interactions in capillary electrophoresis

2006

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Systems biology depends on a comprehensive assignment and characterization of the interactions of proteins and polypeptides (functional proteomics) and of other classes of biomolecules in a given organism. High-capacity screening methods are in place for ligand capture and interaction screening, but a detailed dynamic characterization of molecular interactions under physiological conditions in efficiently separated mixtures with minimal sample consumption is presently provided only by electrophoretic interaction analysis in capillaries, affinity CE (ACE). This has been realized in different fields of biology and analytical chemistry, and the resulting advances and uses of ACE during the last 2.5 years are covered in this review. Dealing with anything from small divalent metal ions to large supramolecular assemblies, the applications of ACE span from low-affinity binding of broad specificity being exploited in optimizing selectivity, e.g., in enantiomer analysis to miniaturized affinity technologies, e.g., for fast processing immunoassay. Also, approaches that provide detailed quantitative characterization of analyte-ligand interaction for drug, immunoassay, and aptamer development are increasingly important, but various approaches to ACE are more and more generally applied in biological research. In addition, the present overview emphasizes that distinct challenges regarding sensitivity, parallel processing, information-rich detection, interfacing with MS, analyte recovery, and preparative capabilities remain. This will be addressed by future technological improvements that will ensure continuing new applications of ACE in the years to come.

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Evaluation of weak ion association between tetraalkylammonium ions and inorganic anions in aqueous solutions by capillary zone electrophoresis

Cited by 25 publications

References 29 publications

Capillary zone electrophoretic studies of ion association between inorganic anions and tetraalkylammonium ions in aqueous–dioxane media

Capillary zone electrophoretic studies of ion association between inorganic anions and tetraalkylammonium ions in aqueous–dioxane media

Capillary electrophoresis of inorganic ions: An update

Recent applications of affinity interactions in capillary electrophoresis

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