1
|
Adil O, Eddington SB, Gagnon KT, Shamsi MH. Microprobes for Label-Free Detection of Short Tandem Repeats: An Insight into Alleviating Secondary Structure Effects. Anal Chem 2023; 95:13528-13536. [PMID: 37651633 DOI: 10.1021/acs.analchem.3c01886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
Overgrowth of short tandem repeat sequences in our genes can cause various neurodegenerative disorders. Such repeat sequences are ideal targets for the label-free electrochemical detection of such potential expansions. However, their length- and sequence-dependent secondary structures may interfere with the interfacial charge transfer of a detection platform, making them complex targets. In addition, the gene contains sporadic repeats that may result in false-positive signals. Therefore, it is necessary to design a platform capable of mitigating these effects and ultimately enhancing the specificity of tandem repeats. Here, we analyzed three different backbones of nucleic acid microprobes [DNA, peptide nucleic acid, and lock-nucleic acid (LNA)] to detect in vitro transcribed RNA carrying CAG repeats, which are associated with Huntington's disease, based on the charge-transfer resistance of the interface. We found that the LNA microprobe can distinguish lengths down to the attomolar concentration level and alleviate the effect of secondary structures and sporadic repeats in the sequence, thus distinguishing the "tandem repeats" specifically. Additionally, the control experiments conducted with and without Mg2+ demonstrated the LNA microprobe to perform better in the presence of the divalent cation. The results suggest that the LNA-based platform may eventually lead to the development of a reliable and straightforward biosensor for genetic neurodegenerative disorders.
Collapse
Affiliation(s)
- Omair Adil
- School of Chemical and Biomolecular Sciences, 1245 Lincoln Dr, Southern Illinois University at Carbondale, Carbondale, Illinois 62901, United States
| | - Seth B Eddington
- Department of Biochemistry, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27101, United States
| | - Keith T Gagnon
- School of Chemical and Biomolecular Sciences, 1245 Lincoln Dr, Southern Illinois University at Carbondale, Carbondale, Illinois 62901, United States
- Department of Biochemistry, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27101, United States
| | - Mohtashim H Shamsi
- School of Chemical and Biomolecular Sciences, 1245 Lincoln Dr, Southern Illinois University at Carbondale, Carbondale, Illinois 62901, United States
| |
Collapse
|
2
|
Buffer species-dependent catalytic activity of Cu-Adenine as a laccase mimic for constructing sensor array to identify multiple phenols. Anal Chim Acta 2022; 1204:339725. [DOI: 10.1016/j.aca.2022.339725] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 03/03/2022] [Accepted: 03/10/2022] [Indexed: 01/15/2023]
|
3
|
Metal-dependent electrochemical discrimination of DNA quadruplex sequences. J Biol Inorg Chem 2021; 26:659-666. [PMID: 34347161 PMCID: PMC8437839 DOI: 10.1007/s00775-021-01881-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 07/09/2021] [Indexed: 11/16/2022]
Abstract
Films of four different DNA quadruplex-forming (G4) sequences (c-KIT, c-MYC, HTelo, and BCL2) on gold surfaces were investigated by electrochemical impedance spectroscopy (EIS) to evaluate whether they evoke unique electrochemical responses that can be used for their identification. This could render EIS an alternative means for the determination of G4 sequences of unknown structure. Towards, this end, cation-dependent topology changes in the presence of either K+, K+ in combination with Li+, or Pb2+ in the presence of Li+ were first evaluated by circular dichroism (CD) spectroscopy, and electrochemical studies were performed subsequently. As a result, G4-sequence specific charge transfer resistance (RCT) patterns were in fact observed for each G4 sequence, allowing their discrimination by EIS.
Collapse
|
4
|
Bhai S, Ganguly B. Role of backbones on the interaction of metal ions with deoxyribonucleic acid and peptide nucleic acid: A DFT study. J Mol Graph Model 2019; 93:107445. [PMID: 31494536 DOI: 10.1016/j.jmgm.2019.107445] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2019] [Revised: 08/28/2019] [Accepted: 08/28/2019] [Indexed: 11/30/2022]
Abstract
Metal ion interaction with deoxyribonucleic acid and peptide nucleic acid were studied using B3LYP-D3/6-311++g(d,p)//B3LYP/6-31 + G(d) level of theory in aqueous phase employing polarized continuum (PCM) model. This study reports the role of backbones on deoxyribonucleic acid and peptide nucleic acid for complexation with different metal ions. The systematic study performed with DFT calculations reveals that central binding (Type-4) shows the strongest binding compared to the other binding modes because of the involvement of the backbone as well as the nitrogenous bases. The charged backbone of DNA nucleotides contributes significantly towards binding with the metal ions. The deoxyguanosine monophosphate (dGMP) clearly indicates the strongest binding upon complexation with Mg2+ (-49.6 kcal/mol), Zn2+ (-45.3 kcal/mol) and Cu2+ (-148.4 kcal/mol), respectively. The neutral backbone of PNA also assists to complex the metal ions with PNA nucleotides. The Mg2+ and Cu2+ prefer to bind with the PNA-Cytosine (-32.9 kcal/mol & -132.9 kcal/mol) in central binding mode (type-4). PNA-Adenine-Zn2+ (-29.1 kcal/mol) is the preferred binding mode (type-4) compared to other modes of interaction for this metal ion with PNA-Adenine nucleotide. The Cu2+ ion showed the superior complexation ability with deoxyribonucleic acid and peptide nucleic acid compared to Mg2+ and Zn2+ ions. The cation-π complexation with the bases of nucleotides was also obtained with Cu2+ ion. The AIM (atoms in molecule) theory has been applied to examine the nature of the interaction of Mg2+, Zn2+, and Cu2+ ion to the deoxyribonucleic acid and peptide nucleic acid. The alkaline earth metal, Mg2+ ion shows electrostatic nature while interaction with deoxyribonucleic acid and peptide nucleic acid, however, the transition metal ions (Zn2+, Cu2+) showed partly covalent nature as well with deoxyribonucleic acid and peptide nucleic acid. The optical properties calculated for the binding of metal ions with deoxyribonucleic acid and peptide nucleic acid showed a diagnostic signature to ascertain the interaction of metal ions with such nucleotides. Cu2+ ion showed larger red shifts in the absorption spectrum values upon complexation with the DNAs and PNAs. The calculated results suggest that such metal ions would prefer to bind with the DNA compared to PNA in DNA-PNA duplexes. The preference for the binding of metal ions with DNA nucleotides is largely attributed to the contribution of charged backbones compared to the neutral PNA backbones.
Collapse
Affiliation(s)
- Surjit Bhai
- Computation and Simulation Unit (Analytical and Environmental Science Division and Centralized Instrument Facility), CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat, 364 002, India
| | - Bishwajit Ganguly
- Computation and Simulation Unit (Analytical and Environmental Science Division and Centralized Instrument Facility), CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat, 364 002, India.
| |
Collapse
|
5
|
Bala A, Górski Ł. Peptide nucleic acid as a selective recognition element for electrochemical determination of Hg 2. Bioelectrochemistry 2017; 119:189-195. [PMID: 29055249 DOI: 10.1016/j.bioelechem.2017.09.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Revised: 09/15/2017] [Accepted: 09/15/2017] [Indexed: 02/01/2023]
Abstract
A novel electrochemical PNA-based biosensor for the determination of Hg2+ is described. The receptor layer, containing single strands of polythymine PNA (peptide nucleic acid), was formed at the surface of gold electrode. Due to the presence of thymine bases and peptide bonds, an interaction between Hg2+ ion and receptor layer occurs. The influence of chain modification - PNA vs. DNA - and type of redox marker - anionic AQMS-Na (sodium salt of anthraquinone-2-sulfonic acid) and FeII/III (potassium ferri/ferrocyanide) or cationic MB (methylene blue) and RuHex (hexaammineruthenium(III) chloride) - were studied. Proposed PNA-based biosensor with anionic AQMS-Na as a redox marker demonstrated significantly better analytical parameters, as compared to results obtained for other tested redox markers (for measurements at pH6.0). The linear response towards Hg2+ was in the range from 5 to 500nmol·L-1 with the detection limit of 4.5nmol·L-1. The developed sensor distinguishes itself with high selectivity towards Hg2+, even for solutions containing several interfering cations. Interactions between Hg2+ and PNA receptor layer were studied using square wave voltammetry (SWV) and electrochemical impedance spectroscopy (EIS).
Collapse
Affiliation(s)
- Agnieszka Bala
- Institute of Biotechnology, Department of Microbioanalytics, Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Łukasz Górski
- Institute of Biotechnology, Department of Microbioanalytics, Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland.
| |
Collapse
|
6
|
Labib M, Sargent EH, Kelley SO. Electrochemical Methods for the Analysis of Clinically Relevant Biomolecules. Chem Rev 2016; 116:9001-90. [DOI: 10.1021/acs.chemrev.6b00220] [Citation(s) in RCA: 555] [Impact Index Per Article: 69.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Mahmoud Labib
- Department
of Pharmaceutical Sciences, University of Toronto, Toronto, Ontario M5S 3M2, Canada
| | | | - Shana O. Kelley
- Department
of Pharmaceutical Sciences, University of Toronto, Toronto, Ontario M5S 3M2, Canada
- Institute
of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, Ontario M5S 3G4, Canada
| |
Collapse
|
7
|
Liang G, Li T, Li X, Liu X. Electrochemical detection of the amino-substituted naphthalene compounds based on intercalative interaction with hairpin DNA by electrochemical impedance spectroscopy. Biosens Bioelectron 2013; 48:238-43. [PMID: 23693094 DOI: 10.1016/j.bios.2013.04.008] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Revised: 03/27/2013] [Accepted: 04/03/2013] [Indexed: 02/01/2023]
Abstract
The amino-substituted naphthalene compounds, such as 1,8-diaminonaphthalene (1,8-DANAP), 2,3-diaminonaphthalene (2,3-DANAP), 1,5-diaminonaphthalene (1,5-DANAP), 1-naphthylamine (1-NAP) and 2-naphthylamine (2-NAP), were investigated by electrochemical impedance spectroscopy (EIS), which was based on the interaction with hairpin DNA immobilized on the gold electrodes. Upon hairpin DNA interacting with the target chemicals, the charge transfer resistance (RCT) of the hairpin DNA films was significantly decreased and the charge transfer resistance change (ΔR(CT)) decreased in a sequence of ΔR(CT) (1,8-DANAP)>ΔR(CT) (2,3-DANAP)>ΔR(CT) (1,5-DANAP)>ΔR(CT) (1-NAP)>ΔR(CT) (2-NAP). The ΔR(CT) changes were due to the difference in the binding constant (K(SV)) of the target chemicals to DNA. In addition, the interaction mechanism was further explored using 1,8-DANAP as a model analyte by fluorescence spectra, Raman spectroscopy, differential pulse voltammetry (DPV) and EIS, correspondingly. The results demonstrated that the amino-substituted naphthalene compounds intercalated into "stem" appearing in the hairpin DNA. Moreover, the hairpin DNA sensor exhibited high sensitivity to the amino-substituted naphthalene compounds with the detection limit of nano-mole, and maintained high selectivity over other selected environmental pollutants. Finally, the DNA sensor was challenged in natural water sample with a recovery of 96-102%, which offered a platform for prospective future development of a simple, rapid, sensitive and low-cost assay for the detection of target aromatic amine pollutants.
Collapse
Affiliation(s)
- Gang Liang
- State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China
| | | | | | | |
Collapse
|
8
|
Joshi T, Barbante GJ, Francis PS, Hogan CF, Bond AM, Gasser G, Spiccia L. Electrochemiluminescent monomers for solid support syntheses of Ru(II)-PNA bioconjugates: multimodal biosensing tools with enhanced duplex stability. Inorg Chem 2012; 51:3302-15. [PMID: 22339152 DOI: 10.1021/ic202761w] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The feasibility of devising a solid support mediated approach to multimodal Ru(II)-peptide nucleic acid (PNA) oligomers is explored. Three Ru(II)-PNA-like monomers, [Ru(bpy)(2)(Cpp-L-PNA-OH)](2+) (M1), [Ru(phen)(2)(Cpp-L-PNA-OH)](2+) (M2), and [Ru(dppz)(2)(Cpp-L-PNA-OH)](2+) (M3) (bpy = 2,2'-bipyridine, phen = 1,10-phenanthroline, dppz = dipyrido[3,2-a:2',3'-c]phenazine, Cpp-L-PNA-OH = [2-(N-9-fluorenylmethoxycarbonyl)aminoethyl]-N-[6-(2-(pyridin-2yl)pyrimidine-4-carboxamido)hexanoyl]-glycine), have been synthesized as building blocks for Ru(II)-PNA oligomers and characterized by IR and (1)H NMR spectroscopy, mass spectrometry, electrochemistry and elemental analysis. As a proof of principle, M1 was incorporated on the solid phase within the PNA sequences H-g-c-a-a-t-a-a-a-a-Lys-NH(2) (PNA1) and H-P-K-K-K-R-K-V-g-c-a-a-t-a-a-a-a-lys-NH(2) (PNA4) to give PNA2 (H-g-c-a-a-t-a-a-a-a-M1-lys-NH(2)) and PNA3 (H-P-K-K-K-R-K-V-g-c-a-a-t-a-a-a-a-M1-lys-NH(2)), respectively. The two Ru(II)-PNA oligomers, PNA2 and PNA3, displayed a metal to ligand charge transfer (MLCT) transition band centered around 445 nm and an emission maximum at about 680 nm following 450 nm excitation in aqueous solutions (10 mM PBS, pH 7.4). The absorption and emission response of the duplexes formed with the cDNA strand (DNA: 5'-T-T-T-T-T-T-T-A-T-T-G-C-T-T-T-3') showed no major variations, suggesting that the electronic properties of the Ru(II) complexes are largely unaffected by hybridization. The thermal stability of the PNA·DNA duplexes, as evaluated from UV melting experiments, is enhanced compared to the corresponding nonmetalated duplexes. The melting temperature (T(m)) was almost 8 °C higher for PNA2·DNA duplex, and 4 °C for PNA3·DNA duplex, with the stabilization attributed to the electrostatic interaction between the cationic residues (Ru(II) unit and positively charged lysine/arginine) and the polyanionic DNA backbone. In presence of tripropylamine (TPA) as co-reactant, PNA2, PNA3, PNA2·DNA and PNA3·DNA displayed strong electrochemiluminescence (ECL) signals even at submicromolar concentrations. Importantly, the combination of spectrochemical, thermal and ECL properties possessed by the Ru(II)-PNA sequences offer an elegant approach for the design of highly sensitive multimodal biosensing tools.
Collapse
Affiliation(s)
- Tanmaya Joshi
- ARC Centre of Excellence for Electromaterials Science and School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | | | | | | | | | | | | |
Collapse
|
9
|
Abstract
Peptide nucleic acid (PNA) is a non-cyclic pseudopeptide-nucleic acid structural mimic with promising applications within diagnostics and drug discovery. This review focuses on metal complex derivatives of PNA. Metal ions and their complexes display unique physical and chemical properties and offer the opportunity to introduce new labels and probes for bioanalytical and diagnostic applications of PNA, but also to modulate or to introduce new (for example catalytic) functions and biological activities.
Collapse
|
10
|
Zhao L, Li X, Lin Y, Yang L, Yu P, Mao L. Electrochemical impedance spectroscopic measurements of FCCP-induced change in membrane permeability of MDCK cells. Analyst 2012; 137:2199-204. [DOI: 10.1039/c2an35064e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
11
|
Joshi T, Barbante GJ, Francis PS, Hogan CF, Bond AM, Spiccia L. Electrochemiluminescent peptide nucleic acid-like monomers containing Ru(II)-dipyridoquinoxaline and Ru(II)-dipyridophenazine complexes. Inorg Chem 2011; 50:12172-83. [PMID: 22040143 DOI: 10.1021/ic201911f] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A series of Ru(II)-peptide nucleic acid (PNA)-like monomers, [Ru(bpy)(2)(dpq-L-PNA-OH)](2+) (M1), [Ru(phen)(2)(dpq-L-PNA-OH)](2+) (M2), [Ru(bpy)(2)(dppz-L-PNA-OH)](2+) (M3), and [Ru(phen)(2)(dppz-L-PNA-OH)](2+) (M4) (bpy = 2,2'-bipyridine, phen = 1,10-phenanthroline, dpq-L-PNA-OH = 2-(N-(2-(((9H-fluoren-9-yl)methoxy)carbonylamino)ethyl)-6-(dipyrido[3,2-a:2',3'-c]phenazine-11-carboxamido)hexanamido)acetic acid, dppz-L-PNA-OH = 2-(N-(2-(((9H-fluoren-9-yl) methoxy)carbonylamino)ethyl)-6-(dipyrido[3,2-f:2',3'-h]quinoxaline-2-carboxamido)acetic acid) have been synthesized and characterized by IR and (1)H NMR spectroscopy, mass spectrometry, and elemental analysis. As is typical for Ru(II)-tris(diimine) complexes, acetonitrile solutions of these complexes (M1-M4) show MLCT transitions in the 443-455 nm region and emission maxima at 618, 613, 658, and 660 nm, respectively, upon photoexcitation at 450 nm. Changes in the ligand environment around the Ru(II) center are reflected in the luminescence and electrochemical response obtained from these monomers. The emission intensity and quantum yield for M1 and M2 were found to be higher than for M3 and M4. Electrochemical studies in acetonitrile show the Ru(II)-PNA monomers to undergo a one-electron redox process associated with Ru(II) to Ru(III) oxidation. A positive shift was observed in the reversible redox potentials for M1-M4 (962, 951, 936, and 938 mV, respectively, vs Fc(0/+) (Fc = ferrocene)) in comparison with [Ru(bpy)(3)](2+) (888 mV vs Fc(0/+)). The ability of the Ru(II)-PNA monomers to generate electrochemiluminescence (ECL) was assessed in acetonitrile solutions containing tripropylamine (TPA) as a coreactant. Intense ECL signals were observed with emission maxima for M1-M4 at 622, 616, 673, and 675 nm, respectively. At an applied potential sufficiently positive to oxidize the ruthenium center, the integrated intensity for ECL from the PNA monomers was found to vary in the order M1 (62%) > M3 (60%) > M4 (46%) > M2 (44%) with respect to [Ru(bpy)(3)](2+) (100%). These findings indicate that such Ru(II)-PNA bioconjugates could be investigated as multimodal labels for biosensing applications.
Collapse
Affiliation(s)
- Tanmaya Joshi
- ARC Centre of Excellence for Electromaterials Science and School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | | | | | | | | | | |
Collapse
|
12
|
Lin Z, Li X, Kraatz HB. Impedimetric Immobilized DNA-Based Sensor for Simultaneous Detection of Pb2+, Ag+, and Hg2+. Anal Chem 2011; 83:6896-901. [DOI: 10.1021/ac2014096] [Citation(s) in RCA: 246] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Zhenzhen Lin
- Department of Chemistry, Beijing Normal University, Beijing, China, 100875
| | - Xiaohong Li
- Department of Chemistry, Beijing Normal University, Beijing, China, 100875
| | - Heinz-Bernhard Kraatz
- Department of Chemistry, University of Western Ontario,1151 Richmond Street, London, N6A 5B7, Canada
| |
Collapse
|
13
|
Exploiting the interactions of PNA-DNA films with Ni2+ ions: detection of nucleobase mismatches and electrochemical genotyping of the single-nucleotide mismatch in apoE 4 related to Alzheimer's disease. Biosens Bioelectron 2011; 27:187-91. [PMID: 21752624 DOI: 10.1016/j.bios.2011.06.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2011] [Revised: 05/20/2011] [Accepted: 06/10/2011] [Indexed: 11/23/2022]
Abstract
The presence of Ni(2+) enables us to distinguish the presence of single-nucleotide mismatches in PNA (peptide nucleic acids)-DNA films on gold electrodes by electrochemical impedance spectroscopy (EIS). With the help of a modified Randles' equivalent circuit, differences in the charge transfer resistance (ΔR(CT)) before and after the addition of Ni(2+) are a diagnostic measure for the presence of single-nucleotide mismatch. The approach works under real-life conditions with concentrations of the DNA target strand down to 10 fM, and a PNA capture probe is used to genotype the single-nucleotide mismatch in apoE 4 related to Alzheimer's disease (AD).
Collapse
|
14
|
Zhang F, Zeng L, Zhang Y, Wang H, Wu A. A colorimetric assay method for Co2+ based on thioglycolic acid functionalized hexadecyl trimethyl ammonium bromide modified Au nanoparticles (NPs). NANOSCALE 2011; 3:2150-2154. [PMID: 21503356 DOI: 10.1039/c1nr10149h] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A simple, rapid and sensitive colorimetric assay method for detection of Co(2+) through thioglycollic acid (TGA) functionalized hexadecyl trimethyl ammonium bromide (CTAB) modified Au NPs has been discovered in our work. TGA functionalized CTAB modified Au NPs can be aggregated quickly in the presence of Co(2+) through a cooperative metal-ligand interaction. Transmission electron microscope (TEM), energy dispersive X-ray spectroscopy (EDS), and UV-vis spectra were used to characterize the Au NPs aggregation. The presence of Co(2+) is monitored by a colorimetric response of functionalized Au NPs, and had a detection limit of 3.0 × 10(-7) M. Moreover, the selectivity of this method has been investigated by comparing with other metal ions (Hg(2+), Na(+), Cu(2+), Cd(2+), Ba(2+), Pb(2+), Mn(2+), Ni(2+), Zn(2+), Fe(2+) and Fe(3+)).
Collapse
Affiliation(s)
- Fuqiang Zhang
- Division of Functional Materials and Nano Devices, Key Laboratory of Magnetic Materials and Devices, Ningbo Institute of Materials Technology & Engineering (NIMTE), Chinese Academy of Sciences (CAS), Ningbo, Zhejiang 315201, China
| | | | | | | | | |
Collapse
|
15
|
Fei Y, Jin XY, Wu ZS, Zhang SB, Shen G, Yu RQ. Sensitive and selective DNA detection based on the combination of hairpin-type probe with endonuclease/GNP signal amplification using quartz-crystal-microbalance transduction. Anal Chim Acta 2011; 691:95-102. [DOI: 10.1016/j.aca.2011.02.040] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2010] [Revised: 02/09/2011] [Accepted: 02/20/2011] [Indexed: 11/24/2022]
|
16
|
Gao L, Li C, Li X, Kraatz HB. Electrochemical impedance study of the interaction of metal ions with unlabeled PNA. Chem Commun (Camb) 2010; 46:6344-6. [PMID: 20680217 DOI: 10.1039/c0cc00986e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interactions of the metal ions Mg(2+), Zn(2+), Ni(2+), and Co(2+) with thin films of peptide nucleic acids (PNAs) were studied by electrochemical impedance spectroscopy (EIS), and the results show that Zn(2+), Ni(2+) and Co(2+) interacted favorably with the PNA film involving the backbone and the nucleobases with the exception of Mg(2+) for which the interaction with the backbone appears to be dominant.
Collapse
Affiliation(s)
- Lan Gao
- Department of Chemistry, Beijing Normal University, Beijing, 100875, China
| | | | | | | |
Collapse
|
17
|
Hvastkovs EG, Buttry DA. Recent advances in electrochemical DNA hybridization sensors. Analyst 2010; 135:1817-29. [DOI: 10.1039/c0an00113a] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|