Highly selective colorimetric determination of catechol based on the aggregation-induced oxidase–mimic activity decrease of δ-MnO₂

Abstract

A new determination mechanism for catechol: aggregation-induced oxidase-mimic activity decrease of δ-MnO2.

An ordered one-step colorimetric sensor for the selective determination of catechol based on the polyacrylic acid-coated cerium oxide with laccase-like activity

“…The sensitivity of both fluorescence and electrochemical sensor [29][30][31][32][33] are higher than that of the proposed colorimetric sensing platform for catechol determination due to the high sensitivity of the instruments themselves. However, compared with other nanozyme-based colorimetric sensing methods, [34][35][36] our method has higher sensitivity which is due to the fact that Ce 3+ /Ce 4+ redox electron pair transfer in PAA-CeO 2 makes it have strong laccase-like catalytic activity, and PAA-CeO 2 with laccase-like activity can directly catalyze the oxidation of catechol without adding additional oxidants. The result showed that the PAA-CeO 2 based colorimetric platform had acceptable sensitivity and linear range for the catechol determination.…”