J. Wang et al., Integrated electrophoresis chips/amperometric detection with sputtered gold working electrodes, ANALYT CHEM, 71(17), 1999, pp. 3901-3904
An on-chip electrochemical detector for micromachined capillary electrophor
esis (CE) systems, based on sputtering a gold working electrode directly on
to the capillary outlet, is described. The new on-chip detector preparation
requires no microfabrication or alignment procedures nor a decoupling mech
anism. The attractive performance of the integrated electrophoresis chips/a
mperometric detection was demonstrated for the anodic detection of neurotra
nsmitters. The response for dopamine was linear from 20 to 200 mu M, with a
LOD of 1.0 mu M and a sensitivity of 52 pA/mu M. Such intimate coupling of
capillary electrophoresis chips and electrochemical detection facilitates
the realization of complete integrated microanalytical devices.