Universiti Teknologi Malaysia Institutional Repository

Development of inlaid electrodes for whole column electrochemical detection in HPLC

Seo, Jung-Ho and Leow, Pei Ling and Cho, Si-Hyeong and Lim, Hyun-Woo and Kim, Jin-Young and Patel, Bhavik Anil and Park, Jin-Goo and O'Hare, Danny (2009) Development of inlaid electrodes for whole column electrochemical detection in HPLC. Lab on a Chip, 9 (15). p. 2238. ISSN 1473-0197

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Official URL: http://dx.doi.org/10.1039/b822045j


An electrochemical microfluidic device has been fabricated on PET (polyethylene terephthalate) substrate using an imprinting method. The imprinting transfers patterns from a stamp into a substrate mechanically. However, a blanket mould imprinting process has been introduced to embed the photolithographically produced gold metal electrode lines into the PET substrate resulting in an individually addressable array flush to better than 100 nm. The device formed one wall of a packed chromatography column. The array was electrochemically characterised using standard redox probes in both stagnant conditions and under flow. Both numerical modelling and experimental data show improved sensitivity under flow and a limiting current which scaled linearly with the cube root of the volume flow rate. A chromatographic separation of the bioanalytical significant neurotransmitter dopamine (DA) and its metabolite DOPAC was achieved and electrochemically detected at multiple locations within the column. The PET device was stable and robust to leaks to pressures well in excess of those required for chromatographic separations.

Item Type:Article
Uncontrolled Keywords:channel microband electrodes, steady-state, chip, electrophoresis, chromatography, fabrication, technology, diffusion, transport, regimes
Subjects:Q Science > Q Science (General)
Q Science > QD Chemistry
Divisions:Chemical Engineering
ID Code:13200
Deposited By: S.N.Shahira Dahari
Deposited On:22 Jul 2011 01:53
Last Modified:22 Jul 2011 01:53

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