Colorimetric Detection System for Salmonella typhimurium Based on Peroxidase-Like Activity of Magnetic Nanoparticles with DNA Aptamers

Figure 1

TEM images and XRD data of MNPs. Scale bars are 50 nm (a) and 20 nm (b). XRD patterns (c) indicate that the synthesized MNPs were Fe₃O₄ based on JCPDF data.

(a)

(b)

(c)