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DNA-Gold Nanozyme-Modified Paper Device for Enhanced Colorimetric Detection of Mercury Ions.
- Source :
-
Biosensors [Biosensors (Basel)] 2020 Dec 18; Vol. 10 (12). Date of Electronic Publication: 2020 Dec 18. - Publication Year :
- 2020
-
Abstract
- In this work, a paper device consisted of a patterned paper chip, wicking pads, and a base was fabricated. On the paper chip, DNA-gold nanoparticles (DNA-AuNPs) were deposited and Hg <superscript>2+</superscript> ions could be adsorbed by the DNA-AuNPs. The formed DNA-AuNP/Hg <superscript>2+</superscript> nanozyme could catalyze the tetramethylbenzidine (TMB)-H <subscript>2</subscript> O <subscript>2</subscript> chromogenic reaction. Due to the wicking pads, a larger volume of Hg <superscript>2+</superscript> sample could be applied to the paper device for Hg <superscript>2+</superscript> detection and therefore the color response could be enhanced. The paper device achieved a cut-off value of 50 nM by the naked eye for Hg <superscript>2+</superscript> under optimized conditions. Moreover, quantitative measurements could be implemented by using a desktop scanner and extracting grayscale values. A linear range of 50-2000 nM Hg <superscript>2+</superscript> was obtained with a detection limit of 10 nM. In addition, the paper device could be applied in the detection of environmental water samples with high recoveries ranging from 85.7% to 105.6%. The paper-device-based colorimetric detection was low-cost, simple, and demonstrated high potential in real-sample applications.
Details
- Language :
- English
- ISSN :
- 2079-6374
- Volume :
- 10
- Issue :
- 12
- Database :
- MEDLINE
- Journal :
- Biosensors
- Publication Type :
- Academic Journal
- Accession number :
- 33353224
- Full Text :
- https://doi.org/10.3390/bios10120211