Some important combinations of detection techniques for electrophoresis in capillaries and on chips with emphasis on electrochemical principles

Opekar, František; Štulı́k, Karel

doi:10.1002/elps.201000455

Cited by 34 publications

(23 citation statements)

References 85 publications

(85 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This leads to a lower detection limit compared to the normal end-column location of the detector. Another promising area lies in the development of new types of combined detectors [41]. A typical arrangement combines C 4 D with optical detection; detectors based on quite different detection principles provide more complex information on the studied system [42–44].…”

Section: Conclusion and Outlook For The Futurementioning

confidence: 99%

Contactless Impedance Sensors and Their Application to Flow Measurements

Opekar

Tůma

Štulı́k

2013

Sensors

Self Cite

View full text Add to dashboard Cite

The paper provides a critical discussion of the present state of the theory of high-frequency impedance sensors (now mostly called contactless impedance or conductivity sensors), the principal approaches employed in designing impedance flow-through cells and their operational parameters. In addition to characterization of traditional types of impedance sensors, the article is concerned with the use of less common sensors, such as cells with wire electrodes or planar cells. There is a detailed discussion of the effect of the individual operational parameters (width and shape of the electrodes, detection gap, frequency and amplitude of the input signal) on the response of the detector. The most important problems to be resolved in coupling these devices with flow-through measurements in the liquid phase are also discussed. Examples are given of cell designs for continuous flow and flow-injection analyses and of detection systems for miniaturized liquid chromatography and capillary electrophoresis. New directions for the use of these sensors in molecular biology and chemical reactors and some directions for future development are outlined.

show abstract

Section: Conclusion and Outlook For The Futurementioning

confidence: 99%

Contactless Impedance Sensors and Their Application to Flow Measurements

Opekar

Tůma

Štulı́k

2013

Sensors

Self Cite

View full text Add to dashboard Cite

show abstract

“…The fundamental methodology of rapid analyses by electrophoresis along short separation pathways has been discussed from many aspects in reviews [19,20] as well as the various combinations of detectors [21].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous and rapid determination of caffeine and taurine in energy drinks by MEKC in a short capillary with dual contactless conductivity/photometry detection

2013

Self Cite

View full text Add to dashboard Cite

A method has been developed for the simultaneous determination of taurine and caffeine using a laboratory-made instrument enabling separation analysis in a short 10.5 cm capillary. The substances are detected using a contactless conductometry/ultraviolet (UV) photometry detector that enables recording both signals at one place in the capillary. The separation of caffeine and taurine was performed using the MEKC technique in a BGE with the composition 40 mM CHES, 15 mM NaOH, and 50 mM SDS, pH 9.36. Under these conditions, the migration time of caffeine is 43 s and of taurine 60 s; LOD for caffeine is 4 mg/L using photometric detection and LOD for taurine is 24 mg/L using contactless conductometric detection. The standard addition method was used for determination in Red Bull energy drink of caffeine 317 mg/L and taurine 3860 mg/L; the contents in Kamikaze drink were 468 mg/L caffeine and 4110 mg/L taurine. The determined values are in good agreement with the declared contents of these substances. RSD does not exceed 3%.

show abstract

“…Elbashir and Aboul‐Enein have summarized the pharmaceutical and biological applications of CE‐C 4 D . Opekar and Štulík discussed the combination with other detectors . Connolly et al reviewed the application of C 4 D to the characterization of chromatographic columns .…”

Section: Introductionmentioning

confidence: 99%

Contactless conductivity detection for analytical techniques: Developments from 2010 to 2012

Kubáň

Hauser

2012

Electrophoresis

View full text Add to dashboard Cite

The developments in the field of capacitively coupled contactless conductivity detection in the approximate period from July 2010 to June 2012 are traced. Few reports concerning fundamental studies or new detector designs have appeared. On the other hand, applications in standard CZE are flourishing and contactless conductivity measurements are increasingly being employed as part of novel or more sophisticated experimental systems. Work on the lab-on-chip devices integrating contactless conductivity detection is continuing. A range of reports on the use of the simple yet powerful detection technique of contactless conductivity measurements in chromatographic separation as well as for analytical methods not including a separation step have also appeared.

show abstract

Some important combinations of detection techniques for electrophoresis in capillaries and on chips with emphasis on electrochemical principles

Cited by 34 publications

References 85 publications

Contactless Impedance Sensors and Their Application to Flow Measurements

Contactless Impedance Sensors and Their Application to Flow Measurements

Simultaneous and rapid determination of caffeine and taurine in energy drinks by MEKC in a short capillary with dual contactless conductivity/photometry detection

Contactless conductivity detection for analytical techniques: Developments from 2010 to 2012

Contact Info

Product

Resources

About