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Pd–Ir Core–Shell Nanocubes: A Type of Highly Efficient and Versatile Peroxidase Mimic
Abstract
Peroxidase mimics with dimensions on the nanoscale have received great interest as emerging artificial enzymes for biomedicine and environmental protection. While a variety of peroxidase mimics have been actively developed recently, limited progress has been made toward improving their catalytic efficiency. In this study, we report a type of highly efficient peroxidase mimic that was engineered by depositing Ir atoms as ultrathin skins (a few atomic layers) on Pd nanocubes (i.e., Pd-Ir cubes). The Pd-Ir cubes exhibited significantly enhanced efficiency, with catalytic constants more than 20- and 400-fold higher than those of the initial Pd cubes and horseradish peroxidase (HRP), respectively. As a proof-of-concept demonstration, the Pd-Ir cubes were applied to the colorimetric enzyme-linked immunosorbent assay (ELISA) of human prostate surface antigen (PSA) with a detection limit of 0.67 pg/mL, which is ∼110-fold lower than that of the conventional HRP-based ELISA using the same set of antibodies and the same procedure.
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Metadata
- Authors
- Xia, X., Zhang, J., Lu, N., Kim, M. J., Ghale, K., Xu, Y., McKenzie, E., Liu, J., & Ye, H.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2015-09-03
- Volume
- 9
- Issue
- 10
- Pages
- 9994-10004
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2412784324
- Cited by
- 316
- References
- 41
- FWCI
- 9.33
- Type
- journal article
- Language
- en
- Open access
- closed
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