301
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Ma W, Li DW, Sutherland TC, Li Y, Long YT, Chen HY. Reversible redox of NADH and NAD+ at a hybrid lipid bilayer membrane using ubiquinone. J Am Chem Soc 2011; 133:12366-9. [PMID: 21774485 DOI: 10.1021/ja204014s] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Here, we report the reversible interconversion between NADH and NAD(+) at a low overpotential, which is in part mediated by ubiquinone embedded in a biomimetic membrane to mimic the initial stages of respiration. This system can be used as a platform to examine biologically relevant electroactive molecules embedded in a natural membrane environment and provide new insights into the mechanism of biological redox cycling.
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302
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Long YT, Kong C, Li DW, Li Y, Chowdhury S, Tian H. Ultrasensitive determination of cysteine based on the photocurrent of nafion-functionalized CdS-MV quantum dots on an ITO electrode. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2011; 7:1624-8. [PMID: 21548084 DOI: 10.1002/smll.201100427] [Citation(s) in RCA: 117] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2011] [Indexed: 05/21/2023]
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303
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Zhang L, Li Y, Li DW, Jing C, Chen X, Lv M, Huang Q, Long YT, Willner I. Single gold nanoparticles as real-time optical probes for the detection of NADH-dependent intracellular metabolic enzymatic pathways. Angew Chem Int Ed Engl 2011; 50:6789-92. [PMID: 21661084 DOI: 10.1002/anie.201102151] [Citation(s) in RCA: 134] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2011] [Indexed: 11/08/2022]
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304
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Zhang L, Li Y, Li DW, Jing C, Chen X, Lv M, Huang Q, Long YT, Willner I. Single Gold Nanoparticles as Real-Time Optical Probes for the Detection of NADH-Dependent Intracellular Metabolic Enzymatic Pathways. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201102151] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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305
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Qin LX, Ma W, Li DW, Li Y, Chen X, Kraatz HB, James TD, Long YT. Coenzyme Q functionalized CdTe/ZnS quantum dots for reactive oxygen species (ROS) imaging. Chemistry 2011; 17:5262-71. [PMID: 21503990 DOI: 10.1002/chem.201003749] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2010] [Indexed: 01/26/2023]
Abstract
Quantum dots (QDs) have been widely used for fluorescent imaging in cells. In particular, surface functionalized QDs are of interest, since they possess the ability to recognize and detect the analytes in the surrounding nanoscale environment based on electron and hole transfer between the analytes and the QDs. Here we demonstrate that fluorescence enhancement/quenching in QDs can be switched by electrochemically modulating electron transfer between attached molecules and QDs. For this purpose, a number of redox-active coenzyme Q (CoQ) disulfide derivatives [CoQC(n)S](2) were synthesized with different alkyl chain lengths (n=1, 5, and 10). The system supremely sensitive to NADH (nicotinamide adenine dinucleotide) and superoxide radical (O(2)(.)(-)), and represents a biomimetic electron-transfer system, modeling part of the mitochondrial respiratory chain. The results of our in situ fluorescence spectroelectrochemical study demonstrate that the reduced state of [CoQC(n)S](2) significantly enhanced the fluorescence intensity of CdTe/ZnS QDs, while the oxidized state of the CoQ conjugates quench the fluorescence to varying degrees. Fluorescence imaging of cells loaded with the conjugate QD-[CoQC(n)S](2) displayed strikingly differences in the fluorescence depending on the redox state of the capping layer, thus introducing a handle for evaluating the status of the cellular redox potential status. Moreover, an MTT assay (MTT=3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) proved that the cytotoxicity of QDs was significantly reduced after immobilization by CoQ derivatives. Those unique features make CoQ derivatived QDs as a promising probe to image redox coenzyme function in vitro and in vivo.
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306
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Ying YL, Li DW, Li Y, Lee JS, Long YT. Enhanced translocation of poly(dt)45 through an α-hemolysin nanopore by binding with antibody. Chem Commun (Camb) 2011; 47:5690-2. [PMID: 21491051 DOI: 10.1039/c0cc05787h] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The translocation time of poly(dT)(45) through an α-hemolysin pore was reduced in the presence of a DNA-binding Fab fragment. The Fab acts as a rudder to steer the DNA into the pore.
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307
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Wang X, Ma W, Ying Y, Liang J, Long YT. Bis-coenzyme q(0) : synthesis, characteristics, and application. Chem Asian J 2011; 6:1064-73. [PMID: 21433296 DOI: 10.1002/asia.201000477] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2010] [Indexed: 11/10/2022]
Abstract
A methylene-bridged bis-coenzyme Q(0), bis(2,3-dimethoxy-5-methyl-l,4-benzoquinone)methane (Bis-CoQ(0)), that shows intramolecular electronic communications has been synthesized for the first time. By employing electrochemical, in situ UV/Vis, and electron paramagnetic resonance (EPR) spectroelectrochemical techniques, the unstable reduced intermediate species-monoradicals, diamagnetic dianions and tetraanions of Bis-CoQ(0)-have been observed. The electron-transfer process can be defined as a three-step reduction process with a total of four electrons in solution in CH(3) CN. The chemical reaction in the third redox step process was confirmed by variable temperature cyclic voltammetry. In an aprotic CH(3) CN solution, the peak potential separation between electron-transfer steps diminished sequentially with increasing concentration of water. The hydrogen-bonding interactions between water and the electrochemically reduced intermediates of Bis-CoQ(0) can be estimated by peak potential shifts. The electronic communications of Bis-CoQ(0) may have been blocked when one reduction peak was observed with proper quantities of water in CH(3) CN solution. The antioxidant defense capacity of Bis-CoQ(0)-protected cells has also been assessed.
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308
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Wang X, Ma W, Ying Y, Liang J, Long YT. Cover Picture: Bis-Coenzyme Q0: Synthesis, Characteristics, and Application (Chem. Asian J. 4/2011). Chem Asian J 2011. [DOI: 10.1002/asia.201190011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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309
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Song W, Li DW, Li YT, Li Y, Long YT. Disposable biosensor based on graphene oxide conjugated with tyrosinase assembled gold nanoparticles. Biosens Bioelectron 2011; 26:3181-6. [DOI: 10.1016/j.bios.2010.12.022] [Citation(s) in RCA: 91] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2010] [Revised: 11/28/2010] [Accepted: 12/13/2010] [Indexed: 10/18/2022]
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310
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He XP, Wang XW, Jin XP, Zhou H, Shi XX, Chen GR, Long YT. Epimeric Monosaccharide−Quinone Hybrids on Gold Electrodes toward the Electrochemical Probing of Specific Carbohydrate−Protein Recognitions. J Am Chem Soc 2011; 133:3649-57. [DOI: 10.1021/ja110478j] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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311
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Wang HY, Ying YL, Li Y, Kraatz HB, Long YT. Nanopore Analysis of β-Amyloid Peptide Aggregation Transition Induced by Small Molecules. Anal Chem 2011; 83:1746-52. [DOI: 10.1021/ac1029874] [Citation(s) in RCA: 128] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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312
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Li YT, Li DW, Song W, Long YT. [Investigation on simultaneous determination of dihydroxybenzene isomers in water samples using multi-walled carbon nanotube modified screen-printed electrode]. HUAN JING KE XUE= HUANJING KEXUE 2011; 32:488-493. [PMID: 21528572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A disposable electrode, multi-walled carbon nanotube modified screen printed electrode (MWCNT/SPE), had been fabricated using screen printing technology and drop-coating method to determine dihydroxybenzene isomers (hydroquinone, catechol and resorcinol). The cyclic voltammetry behavior of dihydroxybenzene isomers had been investigated with the MWCNT/SPE. The results reveal that MWCNT/SPE, which shows a strong electrocatalytic activity for the oxidation of dihydroxybenzenes, can entirely separate the oxidation peaks of them. According to differential pulse voltammetry tests, the peak currents of dihydroxybenzene isomers are linear to their concentrations at the range of 8.20 x 10(-6) -1.00 x 10(-3), 8.20 x 10(-6) -1.00 x 10(-3) and 1.64 x 10(-5) -1.16 x 10(-3) mol x L(-1), with the detection limits of 4.34 x 10(-6), 3.42 x 10(-6) and 6.70 x 10(-6) mol x L(-1) for hydroquinone, catechol and resorcinol, respectively. For the determination of dihydroxybenzene isomers in water samples, the value of recovery found by standard addition method was in the range of 96.2%-104.9%. These results indicate MWCNT/SPE can be applied to rapid in-situ determination of dihydroxybenzenes-polluted water samples.
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313
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Ying YL, Wang HY, Sutherland TC, Long YT. Monitoring of an ATP-binding aptamer and its conformational changes using an α-hemolysin nanopore. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2011; 7:87-94. [PMID: 21086519 DOI: 10.1002/smll.201001428] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
An aptamer is a specific oligonucleotide sequence that spontaneously forms a secondary structure capable of selectively binding an analyte. An aptamer's conformation is the key to specific binding of a target molecule, even in the case of very closely related targets. Nanopores are a sensitive tool for the single-molecule analysis of DNA, peptides, and proteins transporting through the pore. Herein, a single α-hemolysin natural nanopore is utilized to sense the conformational changes of an adenosine 5'-triphosphate (ATP)-binding aptamer (ABA). The known DNA sequence of the ABA is used as a model to develop real-time monitoring of molecular conformational changes that occur by binding targets. The native, folded ABA structure has a nanopore unfolding time of 4.17 ms, compared with 0.29 ms for the ABA:ATP complex. A complementary 14-mer strand, which binds the ABA sequence in the key nucleic acids responsible for folding, forms linear duplex DNA, resulting in a nanopore transit time of 0.50 ms and a higher capture probability than that of the folded ABA oligomer. Competition assays between the ABA:ATP and ABA:reporter complexes are carried out, and the results suggest that the ABA:ATP complex is formed preferentially. The nanopore allows for the detection of an ABA in its folded, ATP-bound, and linear conformations.
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314
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Liang J, Chen BQ, Long YT. A microgap impedance sensor for the determination of trace water in organic solvents. Analyst 2011; 136:4053-8. [DOI: 10.1039/c1an15263g] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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315
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Cheng LY, Long YT, Kraatz HB, Tian H. Evaluation of an immobilized artificial carbonic anhydrase model for CO2 sequestration. Chem Sci 2011. [DOI: 10.1039/c1sc00028d] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
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316
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Li D, Li DW, Fossey JS, Long YT. In situ surface-enhanced Raman scattering and X-ray photoelectron spectroscopic investigation of coenzyme Q10on silver electrode. Phys Chem Chem Phys 2011; 13:2259-65. [DOI: 10.1039/c0cp01449d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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317
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Li Y, Shi L, Qin LX, Qu LL, Jing C, Lan M, James TD, Long YT. An OFF–ON fluorescent probe for Zn2+ based on a GFP-inspired imidazolone derivative attached to a 1,10-phenanthroline moiety. Chem Commun (Camb) 2011; 47:4361-3. [DOI: 10.1039/c1cc10210a] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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318
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Li DW, Qin LX, Li Y, Nia RP, Long YT, Chen HY. CdSe/ZnS quantum dot–Cytochrome c bioconjugates for selective intracellular O2˙− sensing. Chem Commun (Camb) 2011; 47:8539-41. [DOI: 10.1039/c1cc13160e] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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319
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Song SX, Zhang HL, Kim CG, Sheng L, He XP, Long YT, Li J, Chen GR. Expeditious preparation of triazole-linked glycolipids via microwave accelerated click chemistry and their electrochemical and biological assessments. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.10.033] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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320
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Li D, Li DW, Fossey JS, Long YT. Portable Surface-Enhanced Raman Scattering Sensor for Rapid Detection of Aniline and Phenol Derivatives by On-Site Electrostatic Preconcentration. Anal Chem 2010; 82:9299-305. [DOI: 10.1021/ac101812x] [Citation(s) in RCA: 93] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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321
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Cheng LY, Long YT, Tian H, Kraatz HB. Spectroscopic and Electrochemical Investigations into the Interactions of Metal Ions with a Ferrocenoyl-Histidine Peptide Conjugate. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.201000658] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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322
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Liu Q, Li Y, Zhang L, Li D, Fan C, Long YT. Comparative Studies on Electrocatalytic Activities of Chemically Reduced Graphene Oxide and Electrochemically Reduced Graphene Oxide Noncovalently Functionalized with Poly(methylene blue). ELECTROANAL 2010. [DOI: 10.1002/elan.201000306] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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323
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Wang HY, Ying YL, Li Y, Long YT. Peering into Biological Nanopore: A Practical Technology to Single-Molecule Analysis. Chem Asian J 2010; 5:1952-61. [DOI: 10.1002/asia.201000279] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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324
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Li Y, Shi L, Ma W, Li DW, Kraatz HB, Long YT. 6-Vinyl coenzyme Q0: Electropolymerization and electrocatalysis of NADH oxidation exploiting poly-p-quinone-modified electrode surfaces. Bioelectrochemistry 2010; 80:128-31. [PMID: 20678972 DOI: 10.1016/j.bioelechem.2010.07.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2010] [Revised: 06/30/2010] [Accepted: 07/10/2010] [Indexed: 11/24/2022]
Abstract
6-Vinyl coenzyme Q(0) serves as a convenient starting material for the formation of electropolymerized coenzyme Q(0) on glassy carbon electrodes and the modified electrodes displays electrocatalytic activity toward NADH (β-nicotinamide adenine dinucleotide) oxidation. The detection of NADH was measured by differential pulse voltammetry, which reveals that the peak current is linear to the concentration of NADH within the range of 10-100μM. This would be helpful for the understanding of the interaction between coenzyme Q(0) and NADH in the biological process.
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325
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Song W, Zhang L, Shi L, Li DW, Li Y, Long YT. Simultaneous determination of cadmium(II), lead(II) and copper(II) by using a screen-printed electrode modified with mercury nano-droplets. Mikrochim Acta 2010. [DOI: 10.1007/s00604-010-0354-9] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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