A Multimode Responsive Aptasensor for Adenosine Detection

Figure 2

UV-Vis spectra of ssDNA-AuNPs and QDs-AuNPs solutions in the presence of MgCl₂ at different concentrations. The concentrations of MgCl₂ were 0, 1, 2, 2.5, and 3 mM for ssDNA-AuNPs probes (a) and 0, 2, 4, 6, and 8 mM for QDs-AuNPs probes (b). Inset: the plot of the wavelength ratio (λ λ ₅₃₅) versus the increasing concentrations of MgCl₂ of the same data, respectively.

(a)

(b)