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A method for using a hyperbranched polymer (HBP) as a bridge to link multiple secondary antibodies at HBP branches to amplify the detection response signal on a quartz crystal microbalance (QCM)-based sandwich-type immunosensor is reported. Carboxyl groups were prepared at multiple branches of HBP to make possible chemical binding between HBP and secondary antibodies via the carboxyl-amine reaction...
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