Fig. 4From: Label-Free 3D Ag Nanoflower-Based Electrochemical Immunosensor for the Detection of Escherichia coli O157:H7 Pathogens a Typical DPV responses of the electrochemically pretreated Au electrode. b Formation of the Ag@BSA nanoflower film c Conjugation with GA. d Immobilization of anti-E. coli antibody. e Capture of E. coli O157:H7 cells (3.0 × 103 cfu mL−1), measured in 10 mM, pH 7.4, sterile PBS containing [Fe(CN)6]3−/4− (10 mM, 1:1) and 0.1 M KClBack to article page