Colorimetric immunoassays based on pyrroloquinoline quinone-catalyzed generation of Fe(II)-ferrozine with tris(2-carboxyethyl)phosphine as the reducing reagent

[Display omitted] •A novel redox cycling was reported and used for colorimetric immunoassay.•Pyrroloquinoline quinone (PQQ) promoted the reduction of Fe(III)-ferrozine by tris(2-carboxyethyl)phosphine (TCEP).•Mesoporous silica nanoparticle was used as the carrier of PQQ and recognition antibody.•The...

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