Capillary electrophoresis applied to the determination of some seleno compounds

Gilon, Nicole; Potin‐Gautier, Martine

doi:10.1016/0021-9673(95)01265-6

Cited by 44 publications

(31 citation statements)

References 18 publications

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“…2, the RSDs are 0.3 and 3.6% (n = 5) for migration time and peak area of thiourea, respectively. The repeatability is comparable to the typical EK injection in a single capillary system (0.2-2 and 2-5%) [27][28][29]. This high repeatability in migration time indicates the steadiness of the EOF in the two-capillary system once the relative position is fixed.…”

Section: Performance Of the Two-capillary Ek-pi Systemsupporting

confidence: 60%

An electrical pumping approach to eliminate sample bias in capillary electrokinetic injection

Yang¹,

Bao²

2007

Electrophoresis

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A general pumping injection (PI), which involves the use of two capillaries with different diameters, was taken to evaluate systematically the effects on eliminating sample bias associated with the electrokinetic injection process in CE. One end of the separation capillary of the smaller diameter was inserted into another pumping capillary of larger diameter. When a high voltage was applied to the pumping capillary, the EOF generated inside will act as a pump to drive the solution stream in the separation capillary. The results have demonstrated that PI is suitable for both normal and reverse EOF situations. Second, the bias degree (BD) and SD of bias we presented were used to evaluate the degree of the bias under different conditions, and the factors of bias elimination have been investigated. Under optimal conditions, the bias was satisfactorily eliminated by PI. This EOF pumping system was successfully applied to the analysis of samples in CEC for a bias-free injection. Moreover, this two-capillary pumping system did not significantly affect the EOF, current, and the column efficiency of the separation process. Finally, a PI with grounded electrode was proposed and shown to be suitable for samples with low conductivity and ions with different mobility.

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Section: Performance Of the Two-capillary Ek-pi Systemsupporting

confidence: 60%

An electrical pumping approach to eliminate sample bias in capillary electrokinetic injection

Yang¹,

Bao²

2007

Electrophoresis

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“…Various instrumental techniques including capillary electrophoresis (CE), high performance liquid chromatography -inductively coupled plasma -mass spectrometry (HPLC-ICP-MS), and ion chromatography -inductively coupled plasma -mass spectrometry (IC-ICP-MS) have been used by others for the speciation of selenium/tellurium-containing compounds (Casiot et al, 2002;Vogt and Werner, 1994;Schlegel et al, 1996;Albert et al, 1995;Gilon and Potin-Gautier, 1996;Kannamkumarath et al, 2002;Kahakachchi et al, 2004;Caruso and B'Hymer, 2006).…”

Section: Analytical Methods For Detection Of Compounds Of Interestmentioning

confidence: 99%

Capillary electrophoretic determination of selenocyanate and selenium and tellurium oxyanions in bacterial cultures

Pathem

Pradenas

Castro

et al. 2007

Analytical Biochemistry

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Experiments were also designed to detect the biological production of selenocyanate in Se-amended bacterial cultures using IC-ICP-MS. A selenium-resistant bacterium, 130404, when amended with 1.0 mM selenate biologically produced selenocyanate in replicate cultures grown to stationary phase. The amounts produced were statistically significantly different than the amounts of SeCN -produced in sterile but warmed growth media. The headspace gases above growing cultures with or without metalloid amendments were analyzed using gas chromatography. Organo-selenium iii compounds that were detected were methaneselenol, dimethyl selenide, dimethyl selenenyl sulfide, dimethyl diselenenyl sulfide, dimethyl diselenide. Two late eluting peaks were observed in the same cultures that were not characterized but can reasonably be inferred to be dimethyl diselenenyl sulfide and dimethyl triselenide.

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“…When choosing a UVactive co-ion, a close mobility match to the analyte ions is required; otherwise, asymmetrical peak shapes may be generated. Several cationic and anionic co-ions such as imidazole [51,52] and chromate [53][54][55] have been used in the indirect UV detection of element speciation. The main disadvantages of UV-detection method is lack of adequate sensitivity, usually with the detection limits of only 10 25 210 26 M limited by the short path length (2-100 mm) through the column.…”

Section: Detection Techniquesmentioning

confidence: 99%

Elemental speciation analysis in capillary electrophoresis

Liu

Cheng

2003

Electrophoresis

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The growing awareness of the strong development of the toxicity of heavy metals upon their chemical forms has led to an increasing interest in the qualitative and quantitative determination of specific metal species. Speciation has therefore become an important topic of present-day analytical research. The development in the elemental speciation analysis by capillary electrophoresis (CE) is reviewed. Various CE separation modes and detection techniques applied are discussed. A comprehensive description of reported methods to date in CE speciation analysis including metals, metalloids and nonmetallic elements is demonstrated. Some examples are presented to demonstrate CE's ability to solve real-world speciation analysis with emphasis on the applications in biological and environmental samples. Further, some issues concerning the limitations and the future of CE with regard to speciation studies are also discussed.

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Capillary electrophoresis applied to the determination of some seleno compounds

Cited by 44 publications

References 18 publications

An electrical pumping approach to eliminate sample bias in capillary electrokinetic injection

An electrical pumping approach to eliminate sample bias in capillary electrokinetic injection

Capillary electrophoretic determination of selenocyanate and selenium and tellurium oxyanions in bacterial cultures

Elemental speciation analysis in capillary electrophoresis

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