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Wang B, Xu YT, Zhang TY, Wang HY, Zhang X, Wu ZQ, Zhao WW, Chen HY, Xu JJ. An Ultrasensitive and Efficient microRNA Nanosensor Empowered by the CRISPR/Cas Confined in a Nanopore. Nano Lett 2024; 24:202-208. [PMID: 38126308 DOI: 10.1021/acs.nanolett.3c03723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
This work presents a clustered regularly interspaced short palindromic repeat (CRISPR)/Cas-nanopipette nano-electrochemistry (Cas = CRISPR-associated proteins) capable of ultrasensitive microRNA detection. Nanoconfinement of the CRISPR/Cas13a within a nanopipette leads to a high catalytic efficacy of ca. 169 times higher than that in bulk electrolyte, contributing to the amplified electrochemical responses. CRISPR/Cas13a-enabled detection of representative microRNA-25 achieves a low limit of detection down to 10 aM. Practical application of this method is further demonstrated for single-cell and real human serum detection. Its general applicability is validated by addressing microRNA-141 and the SARS-CoV-2 RNA gene fragment. This work introduces a new CRISPR/Cas-empowered nanotechnology for ultrasensitive nano-electrochemistry and bioanalysis.
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Affiliation(s)
- Bing Wang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Yi-Tong Xu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Tian-Yang Zhang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Hai-Yan Wang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Xian Zhang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Zeng-Qiang Wu
- School of Public Health, Institute of Analytical Chemistry for Life Science, Nantong University, Nantong 226019, China
| | - Wei-Wei Zhao
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Hong-Yuan Chen
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Jing-Juan Xu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
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Abstract
Bright, near-infrared electrochemiluminescence (NIR-ECL) of Au18 nanoclusters is reported herein. Spooling ECL and photoluminescence spectroscopy were used to track and link NIR emissions at 832 and 848 nm to three emissive species, Au18 0 *, Au18 1+ * and Au18 2+ *, with a considerably high ECL efficiency of 5.5 relative to that of the gold standard Ru(bpy)3 2+ /TPrA (with 5-6 % reported ECL efficiency). The unprecedentedly high efficiency is due to the overlapped oxidation potentials of Au18 0 and tri-n-propylamine as co-reactant, the exposed facets of Au18 0 gold core, and electrocatalytic loops. These discoveries will add a new member to the efficient NIR-ECL gold nanoclusters family and bring more potential applications.
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Affiliation(s)
- Mahdi Hesari
- Department of Chemistry, The University of Western Ontario, 1151 Richmond St., London, ON N6A 5B7, Canada
| | - Zhifeng Ding
- Department of Chemistry, The University of Western Ontario, 1151 Richmond St., London, ON N6A 5B7, Canada
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Grall S, Alić I, Pavoni E, Awadein M, Fujii T, Müllegger S, Farina M, Clément N, Gramse G. Attoampere Nanoelectrochemistry. Small 2021; 17:e2101253. [PMID: 34121314 DOI: 10.1002/smll.202101253] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 04/19/2021] [Indexed: 06/12/2023]
Abstract
Electrochemical microscopy techniques have extended the understanding of surface chemistry to the micrometer and even sub-micrometer level. However, fundamental questions related to charge transport at the solid-electrolyte interface, such as catalytic reactions or operation of individual ion channels, require improved spatial resolutions down to the nanoscale. A prerequisite for single-molecule electrochemical sensitivity is the reliable detection of a few electrons per second, that is, currents in the atto-Ampere (10-18 A) range, 1000 times below today's electrochemical microscopes. This work reports local cyclic voltammetry (CV) measurements at the solid-liquid interface on ferrocene self-assembled monolayer (SAM) with sub-atto-Ampere sensitivity and simultaneous spatial resolution < 80 nm. Such sensitivity is obtained through measurements of the charging of the local faradaic interface capacitance at GHz frequencies. Nanometer-scale details of different molecular organizations with a 19% packing density difference are resolved, with an extremely small dispersion of the molecular electrical properties. This is predicted previously based on weak electrostatic interactions between neighboring redox molecules in a SAM configuration. These results open new perspectives for nano-electrochemistry like the study of quantum mechanical resonance in complex molecules and a wide range of applications from electrochemical catalysis to biophysics.
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Affiliation(s)
- Simon Grall
- Institute of Biophysics, Johannes Kepler University, Linz, 4020, Austria
| | - Ivan Alić
- Institute of Biophysics, Johannes Kepler University, Linz, 4020, Austria
| | - Eleonora Pavoni
- Department of Information Engineering, Marche Polytechnic University, Ancona, 60131, Italy
| | - Mohamed Awadein
- Keysight Labs Austria, Keysight Technologies, Linz, 4020, Austria
| | - Teruo Fujii
- LIMMS/CNRS, Institute of Industrial Science, University of Tokyo, Tokyo, 153-8505, Japan
| | - Stefan Müllegger
- Institute of Semiconductor and Solid-State Physics, Johannes Kepler University, Linz, 4040, Austria
| | - Marco Farina
- Department of Information Engineering, Marche Polytechnic University, Ancona, 60131, Italy
| | - Nicolas Clément
- LIMMS/CNRS, Institute of Industrial Science, University of Tokyo, Tokyo, 153-8505, Japan
| | - Georg Gramse
- Institute of Biophysics, Johannes Kepler University, Linz, 4020, Austria
- Keysight Labs Austria, Keysight Technologies, Linz, 4020, Austria
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Ghorbal A, Grisotto F, Charlier J, Palacin S, Goyer C, Demaille C, Brahim AB. Nano-Electrochemistry and Nano-Electrografting with an Original Combined AFM-SECM. Nanomaterials (Basel) 2013; 3:303-316. [PMID: 28348337 PMCID: PMC5327889 DOI: 10.3390/nano3020303] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Revised: 04/25/2013] [Accepted: 05/08/2013] [Indexed: 11/16/2022]
Abstract
This study demonstrates the advantages of the combination between atomic force microscopy and scanning electrochemical microscopy. The combined technique can perform nano-electrochemical measurements onto agarose surface and nano-electrografting of non-conducting polymers onto conducting surfaces. This work was achieved by manufacturing an original Atomic Force Microscopy-Scanning ElectroChemical Microscopy (AFM-SECM) electrode. The capabilities of the AFM-SECM-electrode were tested with the nano-electrografting of vinylic monomers initiated by aryl diazonium salts. Nano-electrochemical and technical processes were thoroughly described, so as to allow experiments reproducing. A plausible explanation of chemical and electrochemical mechanisms, leading to the nano-grafting process, was reported. This combined technique represents the first step towards improved nano-processes for the nano-electrografting.
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Affiliation(s)
- Achraf Ghorbal
- Applied Thermodynamics Research Unit, National Engineering School of Gabès, Gabès University, Rue Omar Ibn-Elkhattab, 6029 Gabes, Tunisia.
| | - Federico Grisotto
- Laboratory of Chemistry of Surfaces and Interfaces, DSM/IRAMIS/SPCSI, Atomic Energy Commission of Saclay, 91191 Gif-sur-Yvette, France.
| | - Julienne Charlier
- Laboratory of Chemistry of Surfaces and Interfaces, DSM/IRAMIS/SPCSI, Atomic Energy Commission of Saclay, 91191 Gif-sur-Yvette, France.
| | - Serge Palacin
- Laboratory of Chemistry of Surfaces and Interfaces, DSM/IRAMIS/SPCSI, Atomic Energy Commission of Saclay, 91191 Gif-sur-Yvette, France.
| | - Cédric Goyer
- Department of Molecular Chemistry, Joseph Fourier University, Grenoble Cedex 09, France.
| | - Christophe Demaille
- Laboratory of Molecular Electrochemistry, Paris VII University, 2 Place Jussieu, Paris Cedex 05, France.
| | - Ammar Ben Brahim
- Applied Thermodynamics Research Unit, National Engineering School of Gabès, Gabès University, Rue Omar Ibn-Elkhattab, 6029 Gabes, Tunisia.
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