Fig. 4.

Preconcentration study comparing different concentrations of preconcentrated target (in orange) and non-preconcentrated target (in gray). A 0.1 nM in buffer solution. B 1 nM in buffer solution. C 10 nM in buffer solution. D 0.1 nM in human serum. E 1 nM in human serum. F 10 nM in human serum. All the experiments have been carried out in triplicate