Affinity-tuned peroxidase-like activity of hydrogel-supported Fe3O4 nanozyme through alteration of crosslinking concentration

摘要

In this work, we evaluated the effect of crosslinking concentration on the affinity of poly (2-acrylamido-2-methyl-1-propansulfonic acid) (PAMPS) hydrogel-supported Fe3O4 nanozyme towards substrates (tetramethylbenzidine (TMB) and H2O2). The peroxidase-like catalytic activity of PAMPS/Fe3O4 nanozyme was discussed with respect to crosslinking concentration of PAMPS hydrogel for the oxidation of TMB in the presence of H2O2 at room temperature. High catalytic activity was achieved due to good dispersion of Fe3O4 nanozyme in the hydrogel network and strong affinity of PAMPS hydrogel-supported Fe3O4 nanozyme towards substrates. The affinity between the hydrogel-supported Fe3O4 nanozyme and substrates can be improved by regulating the crosslinking concentration of PAMPS hydrogel without other trenchant experimental conditions. In addition, the result indicated that H2O2 can be detected even at a concentration as low as 1.5 x 10(-6) mol L-1 with a linear detection range of 1.5-9.8 x 10(-6) mol L-1. Such investigations not only showed a new approach to improve the affinity and peroxidase-like activity of Fe3O4 nanozyme, but also verified its potential application in bio-detection and environmental chemistry. (C) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43065.