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Construction of a disposable microfluidic immunoarray device: (a) working electrode; (b) microfluidic channel and (c) reference and counter electrodes; (d) pattern and size of the working electrode array; (e) the formation of the immunosandwich structure; (f) EC detection strategy; (g) amperometric responses of CA15–3 standard solutions at −0.2 V vs. Ag/AgCl after the injection of a mixture of H2O2 and HQ. Reproduced from [23] with permission from the American Chemical Society.
