Target-Induced Aggregation of Gold Nanoparticles for Colorimetric Detection of Bisphenol A

Figure 3

Detection feasibility of the developed system. (a) Absorbance spectra of the sample solutions without (0 μM) and with BPA at different concentrations (5, 10, 25, and 50 μM). (b) Photographs of the sample solutions (1: without BPA (0 μM); 2: with BPA (25 μM)). The final optimized concentrations of AuNPs, DNA aptamer, and CTAB were 0.2X, 100 nM, and 4 μM, respectively.

(a)

(b)