Figure 4From: Aptasensors for rapid detection of Escherichia coli O157:H7 and Salmonella typhimuriumUV–vis absorption spectra and colorimetric response. (I) E. coli O157:H7 with A1/AuNPs. (II) PBS with A1/AuNPs. (III) E. coli O111 with A1/AuNPs. (IV) E. coli O157:H7 with R1/AuNPs.Back to article page