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Year: 2006

Microchip electrophoresis with wall-jet electrochemical detector: Influence of detection potential upon resolution of solutes

This report studies the electrochemical response of wall-jet detector for microchip electrophoresis (mu CE). It shows that in wall-jet configuration, the electrochemical detector operates in coulometric mode and that there is an influence of detection potential upon peak width and therefore upon the resolution of solutes. Upon raising the detection potential from +0.3 to +0.9 …

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Structures of inclusion complexes of halogenbenzoic acids and alpha-cyclodextrin based on AM1 calculations

Semi-empirical quantum mechanics calculations using AM1 (Austin Method 1) were carried out for various host-guest combinations of alpha-cyclodextrin and mono-halogen benzoic acids. The energetically favorable inclusion structures were identified. The AM1 results show that alpha-cyclodextrin complexes with mono-halogen benzoic acid acids (where the halogen is chlorine, bromide, iodine) as guest compounds are more stable in …

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Microchip flow-injection analysis of trace 2,4,6-trinitrotoluene (TNT) using mercury-amalgam electrochemical detector

This paper reports on a microfluidic device for the flow-injection/electrochemistry analysis of nitroaromatic explosive. The response is very fast (150assays/h), highly sensitive (detection limit 7.0 mu gL(-1),), reproducible and stable (R.S.D. = 2.0%; n=30) and linear (over 20-100 [mu g L-1 range). Relevant experimental parameters have been optimized. The new microsystem offers great promise for …

Microchip flow-injection analysis of trace 2,4,6-trinitrotoluene (TNT) using mercury-amalgam electrochemical detector Read More »

Crystal and electrochemical properties of water dispersed CdS nanocrystals obtained via reverse micelles and arrested precipitation

Different methods of synthesis for the production of electroactive nanocrystals (NCs) for use as labels in DNA sensing systems are presented. They are based on two general ways of controlling the formation and growth of the nanoparticles: (a) physical restriction of the volume available for the growth of the individual nanoparticles by using templates such …

Crystal and electrochemical properties of water dispersed CdS nanocrystals obtained via reverse micelles and arrested precipitation Read More »

Analysis of nerve agents using capillary electrophoresis and laboratory-on-a-chip technology

The nerve agents belong among the most toxic compounds produced by human kind. While they have been used very sporadically until now, typically in local conflicts or by local terrorists groups, the global increase in terrorist activity in the recent years has generated tremendous demand for innovative tools capable of detecting nerve agents. Fast, sensitive …

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New materials for electrochemical sensing VII. Microfluidic chip platforms

This overview covers important aspects of microfluidic chip platforms as new materials for electrochemical (EC) sensing. It describes important trends in constructing detectors and their electronics on microfluidic chip platforms, the importance of selecting appropriate detector materials, and the different detection modes in on-chip amperometry, conductometry and potentiometry. We pay particular attention to the latest …

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Carbon nanotube-epoxy composites for electrochemical sensing

Rigid and conductive carbon nanotube-epoxy composite (CNTEC) electrodes were constructed from two kinds of multiwall carbon nanotubes differing in the length (0.5-2 and 0.5-200 mu m) mixed with epoxy resin. The electrochemical behavior of CNTEC electrodes was characterized by using cyclic voltammetry of ferricyanide, NADH and hydrogen peroxide. The behavior of CNTEC electrodes prepared with …

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Analysis of explosives via microchip electrophoresis and conventional capillary electrophoresis: A review

The upsurge in terrorist activity has generated tremendous demand for innovative tools capable of detecting major industrial, military, and home-made (improvised) explosives. Fast, sensitive, and reliable detection of explosives in the field is a very important issue in nowadays. CE, especially in its miniaturized format (lab-on-a-chip), offers great possibilities to create portable, field deployable, rapidly …

Analysis of explosives via microchip electrophoresis and conventional capillary electrophoresis: A review Read More »

Microchip capillary electrophoresis-electrochemistry with rigid graphite-epoxy composite detector

A new rigid graphite-epoxy composite electrode for electrochemical detection in microchip electrophoresis is described. The end-column wall-jet detection design relying oil tubular rigid composite working electrode shows favorably low noise level and high signal-to-noise ratio when compared to glassy carbon detector. The performance of rigid graphite-epoxy composite detector was compared to glassy carbon detector using …

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Microchip capillary electrophoresis with a single-wall carbon nanotube/gold electrochemical detector for determination of aminophenols and neurotransmitters

A new SWCNT modified gold detector for microchip capillary electrophoresis-electrochemistry is described. SWCNT modified gold electrode displays greatly improved sensitivity and separation resolution compared to bare gold electrode, reflecting the electrocatalytic activity of SWCNT. The SWCNT/Au electrode exhibits low background noise levels. Parameters such as separation voltage and detection potential of the microchip electrophoresis-electrochemistry with …

Microchip capillary electrophoresis with a single-wall carbon nanotube/gold electrochemical detector for determination of aminophenols and neurotransmitters Read More »

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