Colorimetric determination of ascorbic acid using a polyallylamine-stabilized IrO 2/graphene oxide nanozyme as a peroxidase mimic

References

ref title DOI material type comment
3448 217 Colorimetric determination of ascorbic acid using a polyallylamine-stabilized IrO 2/graphene oxide nanozyme as a peroxidase mimic https://doi.org/10.1007/s00604-019-3897-4 Composite polyallylamine(PAH)-stabilized IrO2/graphene oxide(GO) nanozyme

Materials

ref material size size err size unit size type size comment BET b nanozyme b 10n b unit specific act sa 10n sa unit comment
7499 217 IrO2 1.7 0.3 nm DLS The average size of IrO2 nanoparticles was 1.7 ± 0.3 nm by counting more than 200 nanoparticles. The monodisperse IrO2 nanoparticles on GO indicated that GO had effectively inhibited the aggregation of IrO2 nanoparticles. There were no unsupported IrO2 nanoparticles observed, which indicated that the GO was an excellent support.

Kinetics

ref material enzyme type substrate pH T km km err km 10n km unit vmax vmax err vmax 10n vmax unit kcat kcat err kcat 10n kcat unit kcat/km kcat/km 10n kcat/km unit comment
6115 217 IrO2/GO POD H2O2 2.0-8.0 0-80 5.19 mM 217 217
6114 217 IrO2/GO POD TMB 2.0-8.0 0-80 0.56 mM 217 217

Applications

ref material application target method linear range linear ran unit LOD lod unit recovery comment
5130 217 IrO2/GO detection of AA Ascorbic acid (AA) Color 5-70 Nm 324 nM
5129 217 IrO2/GO detection of AA Ascorbic acid (AA) Color 5-70 Nm 324 nM The corresponding absorbance exhibited good linearity to the concentration of AA in the range of 5–70 μM with a coefficient of determination (R2) equal to 0.9931