Fig. 5From: Enhanced Stability of Gold Magnetic Nanoparticles with Poly(4-styrenesulfonic acid-co-maleic acid): Tailored Optical Properties for Protein Detection a The relationship between the reaction time and the SPR spectrum. b The redshift of SPR spectra due to aggregation of GoldMag particles caused by cross connection of D-dimer with probe A. c The curve plotted of the SPR peak of composites as a function of the D-dimer concentration. d The SPR spectroscopy of composites after addition of D-dimer to probe BBack to article page