Biogenic synthesis of AuPd nanocluster as a peroxidase mimic and its application for colorimetric assay of acid phosphatase

References

ref title DOI material type comment
3409 178 Biogenic synthesis of AuPd nanocluster as a peroxidase mimic and its application for colorimetric assay of acid phosphatase https://doi.org/10.1016/j.colsurfa.2020.124444 Multi-metal AuPt nanoclusters (Au1Pd5 NCs)

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
7468 178 Au 1 Pd 5 1.4 nm TEM TEM was performed to investigate the size distribution of monometallic and bimetallic NCs. As shown in Fig. 2a and b, NADH-reduced Pd NCs with 24 h-incubation exhibit the mean size of 1.1 nm, while Au NPs show the average diameter of 8.1 nm. Remarkably, both Au1Pd5 and Au1Pd1 exist as highly dispersed NCs, showing the average size of 1.4 and 1.6 nm respectively (Fig. 2c and d). The mean size increases in the order of Pd < Au1Pd5 < Au1Pd1 < Au, which is consistent with the relative content of Au species. Hence, it is reasonable that NADH facilitates the rapid formation of ultrasmall NCs within a suitable range of [Na2PdCl4]/[HAuCl4]. Further, the atomic ratio in bimetallic NCs was determined by ICP-OES. The molar ratio of [Au]/[Pd] is 1.3 for Au1Pd1 and 0.25 for Au1Pd5, which is close to the corresponding theoretical ratio of two precursors in synthesis process.

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
6070 178 Au1Pd5 NCs POD H2O2 160 mM 8.72 -8 M/s 178
6069 178 Au1Pd5 NCs POD TMB 0.086 mM 6.48 -8 M/s 178

Applications

ref material application target method linear range linear ran unit LOD lod unit recovery comment
5086 178 Au 1 Pd 5 A colorimetric test is developed for quantitative determination of acid phosphatase. Acid phosphatase (ACP) Color 1-14 U/L 0.53 U/L 102% 103% 99% To validate the application of this method in human serum, spiked-recovery experiments were carried out with different concentration of ACP. To fit the linear range of the established calibration plot, commercial human serum was appropriately diluted before addition of ACP. The recovery rates are 102 % for 4 U/L, 103 % for 8 U/L and 99 % for 12 U/L ACP (listed in Table 1). The good recovery results guarantee the reliability of this method for estimating ACP activity in biological fluid.
5085 178 Au 1 Pd 5 A colorimetric test is developed for quantitative determination of acid phosphatase. Acid phosphatase (ACP) Color 1-14 U/L 0.53 U/L 102% 103% 99%