A polymer lab-on-a-chip for magnetic immunoassay with on-chip sampling and detection capabilities

摘要

This paper presents a new polymer lab-on-a-chip for magnetic bead-based immunoassay with fully on-chip sampling and detection capabilities,which provides a smart platform of magnetic immunoassay-based lab-on-a-chip for point-of-care testing (POCT) toward biochemical hazardous agent detection,food inspection or clinical diagnostics.In this new approach,the polymer lab-on-a-chip for magnetic bead-based immunoassay consists of a magnetic bead-based separator,an interdigitated array (IDA) micro electrode,and a microfluidic system,which are fully incorporated into a lab-on-a-chip on cyclic olefin copolymer (COC).Since the polymer lab-on-a-chip was realized using low cost,high throughput polymer microfabrication techniques such as micro injection molding and hot embossing method,a disposable polymer lab-on-a-chip for the magnetic bead-based immunoassay can be successfully realized in a disposable platform.With this newly developed polymer lab-on-a-chip,an enzyme-labelled electrochemical immunoassay (ECIA) was performed using magnetic beads as the mobile solid support,and the final enzyme product produced from the ECIA was measured using chronoamperometry.A sampling and detection of as low as 16.4 ng mL~(-1) of mouse IgG has been successfully performed in 35 min for the entire procedure.