Journal ArticleDOI
An Oscillometric Detector for Capillary Electrophoresis
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TLDR
An oscillometric detector for capillary electrophoresis has been described in this article, where two 2-mm silver rings separated by 1 mm were painted over the polyimide coating of a fused-silica capillary and used as electrodes for oscillometric measurements.Abstract:
An oscillometric detector for capillary electrophoresis (CE) has been described. Two 2-mm silver rings separated by 1 mm were painted over the polyimide coating of a fused-silica capillary (75-μm i.d. and 360-μm o.d.) and used as electrodes for oscillometric measurements. A function generator was used to apply a sinusoidal signal over one of the electrodes; the other one was connected to a current-to-voltage converter. The rectified signal is proportional to the admittance of the cell, which is a function of the inner solution conductivity in the region of the electrodes. Electropherograms of alkaline and alkaline-earth cations showed good signal-to-noise ratio. For typical electrophoretic conditions, the limit of detection for lithium was 1.5 μM, and there was good linearity (R = 0.998 for eight data points) up to 2 mM. Indirect conductivity detection of quaternary ammonium salts was achieved by using potassium acetate running buffer, showing results similar to those from conventional conductometric dete...read more
Citations
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Journal ArticleDOI
Understanding Capacitively Coupled Contactless Conductivity Detection in Capillary and Microchip Electrophoresis. Part 1. Fundamentals
José Geraldo Alves Brito-Neto,José Alberto Fracassi da Silva,Lucas Blanes,Claudimir Lucio do Lago +3 more
TL;DR: In this paper, capacitively coupled contactless conductivity detection (C4D) is presented in a progressively detailed approach, through different levels of theoretical and practical complexity, several aspects related to this kind of detection are addressed, which should be helpful to understand the results as well as to design a detector or plan experiments.
Journal ArticleDOI
A review of the recent achievements in capacitively coupled contactless conductivity detection
Pavel Kuban,Peter C. Hauser +1 more
TL;DR: Theoretical aspects of C(4)D in both the capillary and microchip electrophoresis format have been comprehensively investigated and the method can be considered a mature detection technique.
Journal ArticleDOI
Contactless Conductivity Detector for Microchip Capillary Electrophoresis
Martin Pumera,Joseph Wang,František Opekar,Ivan Jelínek,Jason Feldman,Holger Löwe,Steffen Hardt +6 more
TL;DR: The advantages associated with the contactless conductivity detection, along with the low cost of the integrated PMMA chip/detection system, should enhance the power and scope of microfluidic analytical devices.
Journal ArticleDOI
Ten years of axial capacitively coupled contactless conductivity detection for CZE--a review.
Pavel Kubáň,Peter C. Hauser +1 more
TL;DR: It is attempted in this review to summarize some of the expertise accumulated since the introduction of the axial contactless conductivity detector to CE 10 years ago.
Journal ArticleDOI
Fundamental aspects of contactless conductivity detection for capillary electrophoresis. Part I: Frequency behavior and cell geometry
Pavel Kubáň,Peter C. Hauser +1 more
TL;DR: A good fit between theoretical and experimental results shows that the axial contactless conductometric detector can effectively be described by the simplest possible equivalent circuitry consisting of a capacitor, resistor, and a second capacitor.
References
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Journal ArticleDOI
Zone electrophoresis in open-tubular glass capillaries
Journal ArticleDOI
Contactless conductivity detection for capillary electrophoresis.
TL;DR: A contactless capacitively coupled conductivity detector for capillary electrophoresis is introduced and the limit of detection of inorganic cations and anions is 200 ppb, as determined for sodium and chloride, respectively.
Journal ArticleDOI
Quantitative determination of low molecular weight carboxylic acids by capillary zone electrophoresis/conductivity detection
TL;DR: In this paper, low molecular weight carboxylic acids are separated and quantitated by capillary zone electrophoresis (CZE) with an on-column conductivity detector.
Journal ArticleDOI
Sampling and ion chromatographic determination of formaldehyde and acetaldehyde
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