Enhanced organic-inorganic heterojunction of polypyrrole@Bi 2 WO 6 : Fabrication and application for sensitive photoelectrochemical immunoassay of creatine kinase-MB.

In this report, enhanced organic-inorganic heterojunction of polypyrrole@Bi ₂ WO ₆ was fabricated and applied for sensitive photoelectrochemical (PEC) immunoassay of creatine kinase-MB (CK-MB). Specifically, heterostructured polypyrrole@Bi ₂ WO ₆ photoelectrode was prepared and sandwich immunorecognition were integrated for the CK-MB immunoassay. In the detection, with the aid of alkaline phosphate (ALP)-induced biocatalytic precipitation (BCP), the precipitation-dependent suppression of the photocurrent can be recorded due to the impediment of the interfacial mass and electron transfer. On the basis of target-controlled BCP formation, a novel PEC immunoassay could be developed for the sensitive and specific CK-MB detection. This work manifested the great potential of polypyrrole@Bi ₂ WO ₆ heterojunction as a novel platform for PEC bioanalysis development and also a PEC method for CK-MB detection. This work is expected to stimulate more interest in the design and implementation of numerous other organic-inorganic heterojunction for advanced PEC bioanalysis development.
(Copyright © 2019 Elsevier B.V. All rights reserved.)