27 April 2009 Portable integrated capillary-electrophoresis system using disposable polymer chips with capacitively coupled contactless conductivity detection for on-site analysis of foodstuff
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Abstract
We present a compact portable chip-based capillary electrophoresis system that employs capacitively coupled contactless conductivity detection (C4D) operating at 4 MHz as an alternative detection method compared to the commonly used optical detection based on laser-induced fluorescence. Emphasis was put on system integration and industrial manufacturing technologies for the system. Therefore, the disposable chip for this system is fabricated out of PMMA using injection molding; the electrodes are screen-printed or thin-film electrodes. The system is designed for the measurement of small ionic species like Li+, Na+, K+, SO42- or NO3- typically present in foods like milk and mineral water as well as acids e.g. in wine.
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Claudia Gärtner, Werner Hoffmann, Horst Demattio, Thomas Clemens, Matthias Klotz, Richard Klemm, Holger Becker, "Portable integrated capillary-electrophoresis system using disposable polymer chips with capacitively coupled contactless conductivity detection for on-site analysis of foodstuff", Proc. SPIE 7315, Sensing for Agriculture and Food Quality and Safety, 731505 (27 April 2009); doi: 10.1117/12.820316; https://doi.org/10.1117/12.820316
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