Fig. 3
Evaluation of biosensor feasibility. a TEM of Fe3O4 MNPs and RAuMNPs; b EDS mapping results of RAuMNPs; c The number of E. coli O157:H7 in the supernatant after WMR capture; d PAGE analysis of the feasibility of cPER. L1: DNA marker; L2: AP1; L3: P2; L4: HA; L5: AP1 + HA; L6: P2 + HC; L7: H1 + H2; L8: AP1 + P2 + HA + HB + HC + HD; L9: AP1 + H1 + H2 L10: AP1 + P2 + HA + HB + HC + HD; e Raman intensity of the detection of E. coli O157:H7 with cPER and PER.