Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 14, Pages 16801-16811Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c21109
Keywords
diblock DNA; nanozyme activity; photothermal effect; selectivity; sensitivity
Funding
- National Natural Science Foundation of China [22076221, 21876208, 21705166]
- Guangxi Provincial Science and Technology Bases and Special Fund for Talented Persons [Guike-AD20159072]
- Natural Science Foundation of Guangxi Province [2019GXNSFBA245035]
- Hunan Provincial Science and Technology Plan Project, China [2019TP1001]
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Nanozyme activity is influenced by surface area-to-volume ratio and temperature. Novel nanoflower-shaped photothermal nanostructures synthesized using polyadenine-containing diblock DNA showed high peroxidase-mimicking activity and biorecognition capability, suitable for colorimetric cancer cell assays with high sensitivity and selectivity. The nanoflower-shaped nanozyme exhibited higher assay sensitivity compared to spherical gold nanostructures, suggesting potential for nanozyme-based colorimetric sensors for point-of-care testing.
The activity of a nanozyme is closely related to its surface area-to-volume ratio and the surrounding temperature. To acquire highly active nanozymes, one-pot metallization-like synthesis of novel nanoflower-shaped photothermal nanostructures was conducted using polyadenine-containing diblock DNA as the scaffold. The nanoflower-shaped structures with a high surface area-to-volume ratio and photothermal performance exhibited excellent peroxidase-mimicking activity, and the biorecognition capability was retained by the capping agent of diblock DNA. The functionalized nanostructures were used for a proof-of-concept colorimetric assay of cancer cells in vitro. Upon incorporation of 808 nm laser irradiation, high sensitivity and selectivity for the cancer cell assay were achieved with the lowest detection level of 10 cells/mL. Relative to spherical gold nanostructures, the nanoflower-shaped photothermal nanozyme exhibited higher assay sensitivity, paving the way for the construction of nanozyme-based colorimetric sensors for point-of-care testing.
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