eDAQ supplies several products for Capacitively-Coupled Contactless Conductivity Detection (C4D). C4D can be used for:
- Capillary Electrophoresis (CE)
- Microchip Electrophoresis (MCE)
- Ion Chromatography (IC) and High-Performance Liquid Chromatography (HPLC)
- Salt gradient ion exchange chromatography
- Flow Injection Analysis (FIA)
The basis of contactless conductivity meaurements is explained in Figures 1, 2, and 3:
As analyte ions pass into the detection region they cause small changes to the overall sample conductivity. Continous monitoring of the conductivity signal will show a series of peaks, the areas (or heights) of which are related to analyte concentration. The signal is processed like a conventional chromatogram.
The C4D electrodes do not make direct contact with the sample. Thus they are electrically isolated from the sample (ideal for electrophoresis detection), and electrode fouling is eliminated.
Since the the vast majority of analytes for CE are ionic, a C4D system functions as a 'universal' method of detection requiring minimal sample preparation. The technique can also be used in parallel with UV-visible absorbance, or fluorescent detection. Sensitivity is typically similar to UV-visible absorption detection. Click here for some application areas and here for C4D resources.
eDAQ products for C4D
Choose the C4D unit and the C4D headstage suitable for your application. All the C4D headstages work with each of the C4D units.
|ER225||C4D Data System||Includes PowerChrom software for data collection and analysis.|
|ER125||C4D Detector||Can be used with third party data acquisition systems. Has analog and serial interface.|
||Requires e-corder or PowerChrom system.|
|ER283||C4D System Bundle||Includes EA120 C4D Amp and ER280 PowerChrom System.|
C4D Capillary Headstages
|ET120||Capillary Headstage 365 µm||Connection to 365 µm outer diameter capillary.|
|ET120-150||Capillary Headstage 150 µm||Connection to 150 µm outer diameter capillary.|
|ET125||General Purpose Headstage
||for tubing sizes 1/16 inch (1.59 mm) OD or less (specify outer diameter required)|
C4D Microfluidic Chip Platforms
|ET225||Micronit Chip Electrophoresis Platform||Platform for Micronit microfluidic chips ET145-4.|
Microchip Electrophoresis with C4D
|ER230||High Voltage Sequencer||Dual high-voltage supply for microchip electrophoresis.|
|ET145-4||45mm CE Microchip Kit||Four short Micronit microfluidic chips with integrated electrodes for C4D.|
|ET190-2||90mm CE Microchip Kit||Two long Micronit microfluidic chips with integrated electrodes for C4D|
|EC20||Standard Test Solutions for C4D
||Solutions for testing a C4D system in electrophoresis experiments.|
||Dual HV MCE Bundle||Complete system for microchip electrophoresis (floating injections) includes: ER225, ER230, ET225, ET145-4 and EC20.|
||Quad HV MCE Bundle||Complete system for microchip electrophoresis (floating, pinched and gated injections) includes: ER225, 2 x ER230, ET225, ET145-4 and EC20.|