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(a) Photographs of Fe3O4@Au/DTNB/Au/4-MPBA-based LFA strips for the detection at different concentrations of target bacteria. (b) Photographs of colloidal gold−based LFA strips for target bacteria detection. (c,d) Corresponding calibration curves of target bacteria for Fe3O4@Au/DTNB/Au/4-MPBA-based LFA strips.
