Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 10, Issue 4, Pages 1653-1663Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.1c07568
Keywords
PdCu alloy; polydopamine; nanozymes; oxidase-like activity; ascorbic acid-related bioenzymes
Categories
Funding
- National Natural Science Foundation of China [22172063, 21904048]
- Young Taishan Scholars Program [tsqn201812080]
- Natural Science Foundation of Shandong Province [ZR2019YQ10, ZR2020QB033]
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Polydopamine-dressed PdCu alloy (PDA-PdCu) nanozymes with nanochain networks were successfully prepared by combining surface modification and nonprecious metal doping strategies. The synthesized PDA-PdCu samples exhibited considerably enhanced oxidase mimetic activity compared to PDA-Pd and PdCu nanozymes, and a sensitive colorimetric biosensing strategy for ascorbic acid (AA)-related bioenzyme activity was developed.
The spontaneous accumulating nature and undesir-able catalytic activity of nanosized noble-metal nanoparticle-based nanozymes significantly limit their applications in the bioanalytical field. Herein, by combining surface modification and nonprecious metal doping strategies, polydopamine-dressed PdCu alloy (PDA-PdCu) nanozymes with nanochain networks are successfully prepared through a facile one-pot NaBH4 reduction method. It is found that dopamine can shorten the gel formation time and Cu is indispensable for the formation of jelly-like PDA-PdCu samples with chain-like structures. Notably, benefiting from the improved Pd(0)/Pd(II) ratio, the enhanced substrate affinity, and the increased active surface area, the synthesized PDA-PdCu samples exhibit considerably enhanced oxidase mimetic activity compared to PDA-Pd and PdCu nanozymes. By making full use of the enhanced oxidase-like activity of PDA-PdCu and using 3,3',5,5'-tetramethylbenzidine as a chromogenic substrate, a sensitive and straightforward colorimetric biosensing strategy for ascorbic acid (AA)-related bioenzyme activity, including the AA-generating alkaline phosphatase (ALP) and alpha-glucosidase (alpha-Glu) as well as the AA-consuming ascorbic acid oxidase (AA-ox), is elaborately developed. This work not only elucidates that the performance of the nanozyme can be modulated simultaneously by composition and surface modification but also provides a new versatile colorimetric sensing platform for AA-related bioenzymes.
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