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A simple and sensitive method has been proposed to determine a trace level of α-fetoprotein (AFP), hepatocellular carcinoma biomarker, using poly(methyl methacrylate) (PMMA) microfluidic chips coupled with electrochemical detection system. The PMMA microchannels have been modified with poly(ethyleneimine) (PEI) containing abundant NH 2 groups to covalently immobilize AFP monoclonal antibody...
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