Gold Nanoparticle Sensor for the Visual Detection of Pork Adulteration in Meatball Formulation

Figure 2

Absorption spectra of aggregated and non-aggregated GNPs. Shown are absorption spectra of 180 pM gold colloids in DI water (blue curve (a)), in 3 mM PBS (pink curve (b)), and in equimolar PBS after incubation with 3 nM ssDNA probes (red curve (c)), and with the equimolar dsDNA probes (green curve (d)). The vials in the inset shows the color photographs of the solutions in DI water (a), PBS buffer (b), PBS buffer plus ssDNA (c) and PBS buffer plus dsDNA (d).