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- W3144324746 abstract "Electrochemical determination of amino acids on a Cu electrode was established as an attractive scheme for non-electroactive amino acids after microchip electro- phoresis separation. Five amino acids (arginine, proline, histidine, valine, and serine) achieved efficient separation within 60 s on a titanium dioxide nanoparticles (TiO2 NPs) coated poly(dimethylsiloxane) (PDMS) microchip, and then successfully detected on a Cu electrode in end-channel detection mode. In the slightly basic borate medium, ano- dic currents occur for amino acids due to their ability to form Cu(II) complexes and thereby enhance the electro- chemical dissolution of Cu electrode substrate. The increase of the anodic current measured is proportional to the amino acid concentration added to the solution, and therefore, enables direct detection of non-electroactive amino acids on the Cu electrode. The detection limits (S/ N = 3) for arginine, proline, histidine, valine, and serine were measured to be 7, 6, 5, 6, and 5 lM, respectively, with the linear ranges all from 25 to 500 lM. In addition, compared with the native PDMS microchip, resolutions and separation efficiencies of amino acids on the modified microchip were considerably enhanced with the theoretical plate numbers of 8.9 9 10 3 , 6.6 9 10 4 , 4.8 9 10 4 , 5.6 9 10 4 , and 4.4 9 10 4 plates m -1 , respectively. The" @default.
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- W3144324746 date "2011-01-01" @default.
- W3144324746 modified "2023-09-24" @default.
- W3144324746 title "Enhanced electrophoresis separation of non-electroactive amino acids on poly(dimethylsiloxane) microchip coupled with direct electrochemical detection on a copper electrode" @default.
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