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Karabaliev M, Paarvanova B, Savova G, Tacheva B, Jahn S, Georgieva R. Electrochemical Investigation of the Stability of Poly-Phosphocholinated Liposomes. Molecules 2024; 29:3511. [PMID: 39124916 DOI: 10.3390/molecules29153511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2024] [Revised: 07/19/2024] [Accepted: 07/22/2024] [Indexed: 08/12/2024] Open
Abstract
Poly[2-(methacryloyloxy)ethyl phosphorylcholine] liposomes (pMPC liposomes) gained attention during the last few years because of their potential use in treating osteoarthritis. pMPC liposomes that serve as boundary lubricants are intended to restore the natural lubrication properties of articular cartilage. For this purpose, it is important that the liposomes remain intact and do not fuse and spread as a lipid film on the cartilage surface. Here, we investigate the stability of the liposomes and their interaction with two types of solid surfaces, gold and carbon, by using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). With the aid of a hydrophilic species used as an electroactive probe in the solution, the charge transfer characteristics of the electrode surfaces are obtained. Additionally, from EIS, the capacitance characteristics of the surfaces are derived. No decrease of the peak currents and no displacement of the peak potentials to greater overpotentials are observed in the CV experiments. No decrease in the apparent capacitance and increase in the charge transfer resistance is observed in the EIS experiments. On the contrary, all parameters in both CV and EIS do change in the opposite direction. The obtained results confirm that there is only physical adsorption without fusion and spreading of the pMPC liposomes and without the formation of lipid films on the surfaces of both gold and carbon electrodes.
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Affiliation(s)
- Miroslav Karabaliev
- Department of Physics, Biophysics, Roentgenology and Radiology, Faculty of Medicine, Trakia University, 11 Armeiska Str., 6000 Strara Zagora, Bulgaria
| | - Boyana Paarvanova
- Department of Physics, Biophysics, Roentgenology and Radiology, Faculty of Medicine, Trakia University, 11 Armeiska Str., 6000 Strara Zagora, Bulgaria
| | - Gergana Savova
- Department of Physics, Biophysics, Roentgenology and Radiology, Faculty of Medicine, Trakia University, 11 Armeiska Str., 6000 Strara Zagora, Bulgaria
| | - Bilyana Tacheva
- Department of Physics, Biophysics, Roentgenology and Radiology, Faculty of Medicine, Trakia University, 11 Armeiska Str., 6000 Strara Zagora, Bulgaria
| | - Sabrina Jahn
- Liposphere Ltd., Aarava 1, Givaat Shemuel 5400804, Israel
| | - Radostina Georgieva
- Department of Physics, Biophysics, Roentgenology and Radiology, Faculty of Medicine, Trakia University, 11 Armeiska Str., 6000 Strara Zagora, Bulgaria
- Institute of Transfusion Medicine, Charité-Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany
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Ravandeh M, Kahlert H, Jablonowski H, Lackmann JW, Striesow J, Agmo Hernández V, Wende K. A combination of electrochemistry and mass spectrometry to monitor the interaction of reactive species with supported lipid bilayers. Sci Rep 2020; 10:18683. [PMID: 33122650 PMCID: PMC7596530 DOI: 10.1038/s41598-020-75514-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 10/15/2020] [Indexed: 01/21/2023] Open
Abstract
Reactive oxygen and nitrogen species (RONS), e.g. generated by cold physical plasma (CPP) or photodynamic therapy, interfere with redox signaling pathways of mammalian cells, inducing downstream consequences spanning from migratory impairment to apoptotic cell death. However, the more austere impact of RONS on cancer cells remains yet to be clarified. In the present study, a combination of electrochemistry and high-resolution mass spectrometry was developed to investigate the resilience of solid-supported lipid bilayers towards plasma-derived reactive species in dependence of their composition. A 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) lipid bilayer was undisturbed by 200 µM H2O2 (control) but showed full permeability after CPP treatment and space-occupying oxidation products such as PoxnoPC, PAzePC, and POPC hydroperoxide were found. Electron paramagnetic resonance spectroscopy demonstrated the presence of hydroxyl radicals and superoxide anion/hydroperoxyl radicals during the treatment. In contrast, small amounts of the intramembrane antioxidant coenzyme Q10 protected the bilayer to 50% and LysoPC was the only POPC derivative found, confirming the membrane protective effect of Q10. Such, the lipid membrane composition including the presence of antioxidants determines the impact of pro-oxidant signals. Given the differences in membrane composition of cancer and healthy cells, this supports the application of cold physical plasma for cancer treatment. In addition, the developed model using the combination of electrochemistry and mass spectrometry could be a promising method to study the effect of reactive species or mixes thereof generated by chemical or physical sources.
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Affiliation(s)
- M Ravandeh
- Institute of Biochemistry, University of Greifswald, Felix-Hausdorff-Str. 4, 17489, Greifswald, Germany
- Leibniz-Institute for Plasma Science and Technology, ZIK Plasmatis, Felix-Hausdorff-Str. 2, 17489, Greifswald, Germany
| | - H Kahlert
- Institute of Biochemistry, University of Greifswald, Felix-Hausdorff-Str. 4, 17489, Greifswald, Germany
| | - H Jablonowski
- Leibniz-Institute for Plasma Science and Technology, ZIK Plasmatis, Felix-Hausdorff-Str. 2, 17489, Greifswald, Germany
| | - J-W Lackmann
- Leibniz-Institute for Plasma Science and Technology, ZIK Plasmatis, Felix-Hausdorff-Str. 2, 17489, Greifswald, Germany
| | - J Striesow
- Leibniz-Institute for Plasma Science and Technology, ZIK Plasmatis, Felix-Hausdorff-Str. 2, 17489, Greifswald, Germany
| | - V Agmo Hernández
- Department of Chemistry-BMC, Uppsala University, Husargatan 3, 75123, Uppsala, Sweden
- Department of Pharmacy, Uppsala University, Husargatan 3, 75123, Uppsala, Sweden
| | - K Wende
- Leibniz-Institute for Plasma Science and Technology, ZIK Plasmatis, Felix-Hausdorff-Str. 2, 17489, Greifswald, Germany.
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A Note on the Consequences of a Hot Mitochondrion: Some Recent Developments and Open Questions. ACTA ACUST UNITED AC 2020. [DOI: 10.26565/2075-3810-2020-43-02] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Background: Chrétien and co-workers (PLOS Biology. 2018;16(1):e2003992) recently suggested that the mitochondrion might possibly be hotter than its surrounding (by as much as 10°C). Objectives: To examine the validity of this claim and review the possible implications and repercussion of such a claim – if true – on some aspects of mitochondrial biochemistry and biophysics. Results: Both the chemical gradient and the electrical gradient Gibbs energy terms in the central equation of chemiosmotic theory are temperature dependent, the first explicitly and the second implicitly. A hotter mitochondrion – as claimed – would imply a 3% correction in the chemical gradient term, but we cannot estimate the corresponding effect on the electrical term at this time since the functional dependence of the voltage on the temperature is not known to the best of the authors’ knowledge. Further, if this claim is true and to the extent claimed (10°C), this may imply some heat-engine character for mitochondrial thermodynamic operation albeit this may only represent 4% at most. Conclusions: Doubts and criticisms regarding the suggestion of a hotter mitochondrion have been raised and are briefly discussed. These doubts are contrasted with some data and considerations that support the claim of a hotter mitochondrion. It is concluded that the mitochondrion is probably hotter than its environment but not to the extent claimed by Chrétien et al. and that the thermodynamic efficiency and the mode of operation of the mitochondrion as an electrochemical battery are very slightly perturbed by even the maximum claimed revision of the temperature of its operation.
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In situ determination of potential-driven structural changes in a redox-active plumbagin polymer film on a glassy carbon electrode using PM IRRAS under electrochemical control. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.09.152] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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5
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Li D, Deng W, Xu H, Sun Y, Wang Y, Chen S, Ding X. Electrochemical Investigation of Coenzyme Q10 on Silver Electrode in Ethanol Aqueous Solution and Its Determination Using Differential Pulse Voltammetry. ACTA ACUST UNITED AC 2016; 21:579-89. [DOI: 10.1177/2211068216644442] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Indexed: 11/15/2022]
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6
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Hoyo J, Guaus E, Torrent-Burgués J, Sanz F. Electrochemistry of LB films of mixed MGDG:UQ on ITO. Bioelectrochemistry 2015; 104:26-34. [DOI: 10.1016/j.bioelechem.2015.02.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Revised: 02/18/2015] [Accepted: 02/19/2015] [Indexed: 01/07/2023]
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7
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Electrochemical detection of the 2-isobutyl-3-methoxypyrazine model odorant based on odorant-binding proteins: The proof of concept. Bioelectrochemistry 2015; 101:28-34. [DOI: 10.1016/j.bioelechem.2014.06.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Revised: 06/10/2014] [Accepted: 06/15/2014] [Indexed: 11/22/2022]
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8
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9
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Liehn C, Bouvet M, Meunier-Prest R. Proton Transfer versus Hydrogen Bonding: The Reduction of Ubiquinone Q 2Incorporated in a Self-Assembled Monolayer in Unbuffered Aqueous Solution. ChemElectroChem 2014. [DOI: 10.1002/celc.201402191] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Agmo Hernández V, Reijmar K, Edwards K. Label-Free Characterization of Peptide–Lipid Interactions Using Immobilized Lipodisks. Anal Chem 2013; 85:7377-84. [DOI: 10.1021/ac4012842] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Víctor Agmo Hernández
- Department of Chemistry − BMC, Uppsala University, Box 579, SE-75123, Uppsala, Sweden
| | - Karin Reijmar
- Department of Chemistry − BMC, Uppsala University, Box 579, SE-75123, Uppsala, Sweden
| | - Katarina Edwards
- Department of Chemistry − BMC, Uppsala University, Box 579, SE-75123, Uppsala, Sweden
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11
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Mårtensson C, Agmo Hernández V. Ubiquinone-10 in gold-immobilized lipid membrane structures acts as a sensor for acetylcholine and other tetraalkylammonium cations. Bioelectrochemistry 2012; 88:171-80. [PMID: 22542468 DOI: 10.1016/j.bioelechem.2012.03.009] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Revised: 03/13/2012] [Accepted: 03/30/2012] [Indexed: 01/02/2023]
Abstract
It is reported that the reduction of ubiquinone incorporated into supported lipid bilayers and into immobilized liposome layers on gold electrodes is kinetically and thermodynamically enhanced by the presence of acetylcholine and tetrabutylammonium (TBA(+)) in solution. The reduction peak and the mid-peak potentials of the redox reactions, determined by cyclic voltammetry, are displaced towards more positive potentials by approximately 500 and 250mV, respectively, in the case of TBA(+); and by approximately 750 and 530mV, respectively, in the case of acetylcholine. The intensity of the signal varies with the cation concentration, allowing for quantitative determinations in the millimolar range. It is proposed that the enhanced reduction of ubiquinone arises from the formation of tetraalkylammonium cation-ubiquinone radical anion ion-pairs. Electrochemical quartz crystal microbalance with dissipation monitoring (EQCM-D) measurements confirmed that the potential shift and the intensity of the redox signal are coupled with the adsorption of the tetraalkylammonium cations on the lipid membrane. The Langmuir adsorption equilibrium constant (K) of TBA(+) on lipid membranes at physiological pH is determined. In supported lipid bilayers K=440.7±160M(-1), while in an immobilized liposome layer K=35.53±3.53M(-1).
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Affiliation(s)
- Christoffer Mårtensson
- Department of Physical and Analytical Chemistry, Uppsala University, Husargatan 3, Box 579, 75123, Uppsala, Sweden.
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12
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Campos R, Kataky R. Electron Transport in Supported and Tethered Lipid Bilayers Modified with Bioelectroactive Molecules. J Phys Chem B 2012; 116:3909-17. [DOI: 10.1021/jp209772u] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rui Campos
- Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, United Kingdom
| | - Ritu Kataky
- Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, United Kingdom
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13
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14
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Becucci L, Scaletti F, Guidelli R. Gel-phase microdomains and lipid rafts in monolayers affect the redox properties of ubiquinone-10. Biophys J 2011; 101:134-43. [PMID: 21723823 DOI: 10.1016/j.bpj.2011.05.051] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2011] [Revised: 05/23/2011] [Accepted: 05/26/2011] [Indexed: 10/18/2022] Open
Abstract
The redox properties of ubiquinone-10 (UQ) were examined in monolayers of mixtures of dioleoylphosphatidylcholine, palmitoylsphingomyelin, and cholesterol of different compositions, self-assembled on a mercury electrode, over the pH range from 7.5 to 9.5. A detailed analysis of the cyclic voltammograms of UQ in the above lipid environments points to a mechanism consisting of an elementary electron transfer step followed by two protonation (or deprotonation) steps in quasiequilibrium and by a further electron transfer step. In a lipid environment of solid-ordered (s(o)) microdomains in a liquid-disordered (l(d)) matrix, electron transport across the lipid monolayer takes place in the l(d) phase. In a pure s(o) phase, UQ tends to segregate into UQ-rich pools, exhibiting reversible electron transfer steps. In a lipid environment consisting of liquid-ordered (l(o)) microdomains (lipid rafts) in an l(d) matrix, UQ molecules tend to localize along the edge of the lipid rafts. However, in a lipid environment consisting exclusively of l(o) and s(o) microdomains, UQ molecules tend to segregate into UQ-rich pools. In all lipid environments, electron transport by UQ occurs with the quinone moiety localized on the solution side with respect to the ester linkages of the dioleoylphosphatidylcholine molecules.
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Affiliation(s)
- Lucia Becucci
- Chemistry Department, Florence University, Firenze, Italy
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15
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Michalkiewicz S. Anodic oxidation of oxidized forms of coenzymes Q10 and Q0 on carbon electrodes in acetic acid solutions. Bioelectrochemistry 2011; 82:103-11. [DOI: 10.1016/j.bioelechem.2011.06.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2011] [Revised: 05/23/2011] [Accepted: 06/12/2011] [Indexed: 10/18/2022]
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16
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Bogeski I, Gulaboski R, Kappl R, Mirceski V, Stefova M, Petreska J, Hoth M. Calcium binding and transport by coenzyme Q. J Am Chem Soc 2011; 133:9293-303. [PMID: 21548646 DOI: 10.1021/ja110190t] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Coenzyme Q10 (CoQ10) is one of the essential components of the mitochondrial electron-transport chain (ETC) with the primary function to transfer electrons along and protons across the inner mitochondrial membrane (IMM). The concomitant proton gradient across the IMM is essential for the process of oxidative phosphorylation and consequently ATP production. Cytochrome P450 (CYP450) monoxygenase enzymes are known to induce structural changes in a variety of compounds and are expressed in the IMM. However, it is unknown if CYP450 interacts with CoQ10 and how such an interaction would affect mitochondrial function. Using voltammetry, UV-vis spectrometry, electron paramagnetic resonance (EPR), nuclear magnetic resonance (NMR), fluorescence microscopy and high performance liquid chromatography-mass spectrometry (HPLC-MS), we show that both CoQ10 and its analogue CoQ1, when exposed to CYP450 or alkaline media, undergo structural changes through a complex reaction pathway and form quinone structures with distinct properties. Hereby, one or both methoxy groups at positions 2 and 3 on the quinone ring are replaced by hydroxyl groups in a time-dependent manner. In comparison with the native forms, the electrochemically reduced forms of the new hydroxylated CoQs have higher antioxidative potential and are also now able to bind and transport Ca(2+) across artificial biomimetic membranes. Our results open new perspectives on the physiological importance of CoQ10 and its analogues, not only as electron and proton transporters, but also as potential regulators of mitochondrial Ca(2+) and redox homeostasis.
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Affiliation(s)
- Ivan Bogeski
- Department of Biophysics, School of Medicine, Saarland University, 66421 Homburg, Germany
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17
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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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18
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Lemmer C, Bouvet M, Meunier-Prest R. Proton coupled electron transfer of ubiquinone Q2 incorporated in a self-assembled monolayer. Phys Chem Chem Phys 2011; 13:13327-32. [DOI: 10.1039/c0cp02700f] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Nelson A. Electrochemistry of mercury supported phospholipid monolayers and bilayers. Curr Opin Colloid Interface Sci 2010. [DOI: 10.1016/j.cocis.2010.07.004] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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20
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Tekin E, Erkoc S. Structural and electronic features of the ubiquinone and ubiquinol molecules: molecular dynamics and quantum chemical treatments. MOLECULAR SIMULATION 2010. [DOI: 10.1080/08927021003752838] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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21
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Fotouhi L, Banafsheh S, Heravi MM. Electrochemistry of the interaction of furazolidone and bovine serum albumin. Bioelectrochemistry 2009; 77:26-30. [DOI: 10.1016/j.bioelechem.2009.05.011] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2009] [Revised: 05/23/2009] [Accepted: 05/25/2009] [Indexed: 10/20/2022]
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22
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Trammell SA, Lebedev N. Proton–coupled electron transfer in self-assembled monolayers containing quinone compounds with different bridging groups of varying electronic conjugation. J Electroanal Chem (Lausanne) 2009. [DOI: 10.1016/j.jelechem.2009.04.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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23
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Synthesis and electrochemistry of self-assembled monolayers containing quinone derivatives with varying electronic conjugation. J Electroanal Chem (Lausanne) 2009. [DOI: 10.1016/j.jelechem.2009.01.023] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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24
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Voltammetric determination of coenzyme Q10 in pharmaceutical dosage forms. Bioelectrochemistry 2008; 73:30-6. [DOI: 10.1016/j.bioelechem.2008.04.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2007] [Revised: 04/01/2008] [Accepted: 04/06/2008] [Indexed: 11/18/2022]
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25
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Poly(amidosulfonic acid) modified glassy carbon electrode for determination of isoniazid in pharmaceuticals. Bioelectrochemistry 2008; 73:37-42. [DOI: 10.1016/j.bioelechem.2008.04.005] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2007] [Revised: 01/18/2008] [Accepted: 04/06/2008] [Indexed: 11/22/2022]
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26
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Wang C, Mao Y, Wang D, Yang G, Qu Q, Hu X. Voltammetric determination of terbinafine in biological fluid at glassy carbon electrode modified by cysteic acid/carbon nanotubes composite film. Bioelectrochemistry 2008; 72:107-15. [DOI: 10.1016/j.bioelechem.2007.11.014] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2007] [Revised: 11/28/2007] [Accepted: 11/28/2007] [Indexed: 11/25/2022]
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27
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Trammell SA, Lowy DA, Seferos DS, Moore M, Bazan GC, Lebedev N. Heterogeneous electron transfer of quinone–hydroquinone in alkaline solutions at gold electrode surfaces: Comparison of saturated and unsaturated bridges. J Electroanal Chem (Lausanne) 2007. [DOI: 10.1016/j.jelechem.2007.04.008] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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28
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Michalkiewicz S. Cathodic reduction of coenzyme Q10 on glassy carbon electrode in acetic acid–acetonitrile solutions. Bioelectrochemistry 2007; 70:495-500. [DOI: 10.1016/j.bioelechem.2006.08.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2006] [Revised: 08/09/2006] [Accepted: 08/26/2006] [Indexed: 11/27/2022]
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29
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Dominska M, Mazur M, Greenough KP, Koan MM, Krysiński PG, Blanchard GJ. Probing organization and communication at layered interfaces. Bioelectrochemistry 2006; 70:421-34. [PMID: 16920037 DOI: 10.1016/j.bioelechem.2006.06.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2005] [Revised: 02/20/2006] [Accepted: 06/22/2006] [Indexed: 11/22/2022]
Abstract
We have investigated the local organization intrinsic to a variety of interfacial structures, by both electrochemical and spectroscopic means. Our focus has been on the design and construction of biomimetic interfaces, where a lipid bilayer or a hybrid bilayer membrane can be bound to an interface. The goal of this work is ultimately to create an interface on a transducer surface that can support an enzyme in its active form. To this point, we have examined the extent of organization that is achievable in monolayers that will be used to bind bilayer structures to a transducer surface. Our electrochemical data point to the important role of the substrate surface in determining adlayer organization. We have also investigated the fluidity and structural heterogeneity of lipid bilayers using time-resolved and steady state fluorescence spectroscopy. Our data point to the highly interactive nature of lipid bilayer constituents, where perturbations introduced to one region have significant consequences on other regions of the bilayer. Such information is directly relevant to the existence and properties of lipid raft structures in both model and biological bilayers.
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Affiliation(s)
- Monika Dominska
- Michigan State University, Department of Chemistry, East Lansing, MI 48824, USA
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Domińska M, Jackowska K, Krysiński P, Blanchard GJ. Probing Interfacial Organization in Surface Monolayers Using Tethered Pyrene. 1. Structural Mediation of Electron and Proton Access to Adsorbates. J Phys Chem B 2005; 109:15812-21. [PMID: 16853009 DOI: 10.1021/jp0513824] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We have synthesized and characterized a family of self-assembled monolayers containing pyrene derivatives on gold and indium-doped tin oxide (ITO) substrates. The covalently bound pyrene functionalities serve as either spectroscopic or electrochemical probes of their immediate environment, and we explore their electrochemical response in this paper. When these compounds are the only constituents bound to the interfaces, the molecules enjoy significant structural freedom. The addition of aliphatic adsorbates to the interfaces serves to place the pyrene derivatives in a more restricted environment. Cyclic voltammetry shows that the organization of a monolayer with pyrene derivatives, and the position of the terminal pyrene within such monolayer, depend sensitively on the length of the pyrene tether and the presence or absence of aliphatic interfacial species, as well as the identity of the substrate.
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Affiliation(s)
- Monika Domińska
- Department of Chemistry, University of Warsaw, 02-093 Warsaw, Pasteura 1, Poland
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31
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Karabaliev M, Kochev V. The potential of manganese in construction of electrodes modified with thin liquid films of lipids. J Electroanal Chem (Lausanne) 2004. [DOI: 10.1016/j.jelechem.2004.05.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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32
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Karabaliev M, Kochev V. Interaction of thin wetting films of lecithin with some divalent cations. Bioelectrochemistry 2004; 63:177-81. [PMID: 15110269 DOI: 10.1016/j.bioelechem.2003.10.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2003] [Revised: 09/25/2003] [Accepted: 10/09/2003] [Indexed: 10/26/2022]
Abstract
The impact of some divalent cations on the structure of a model membrane system, comprising wetting lipid films, is assayed in this work. The results from impedimetry suggest prominent structural changes upon the addition of the discussed ions to the electrolyte solution contacting the film. These changes are manifested by the increase of resistivity of the films as well as by the decrease of capacitance dispersion. In accordance with other data in the literature, manganese (Mn(2+)) turned out to have an effect greater than those of Mg(2+) and Ca(2+).
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Affiliation(s)
- Miroslav Karabaliev
- Department of Physics and Biophysics, Faculty of Medicine, Trakia University, 11 Armeiska, Stara Zagora 6003, Bulgaria.
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Kochev V, Karabaliev M. Wetting films of lipids in the development of sensitive interfaces. An electrochemical approach. Adv Colloid Interface Sci 2004; 107:9-26. [PMID: 14962405 DOI: 10.1016/j.cis.2003.08.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/01/2003] [Indexed: 11/16/2022]
Abstract
Solid-supported thin liquid films of lipids, contacting an electrolyte phase, turned out to be a dependable system in the field of bosensors. The investigations of these objects during the past decade reveal some of their intriguing features enabling the application in constructions of receptor part with 'two-dimensional' arrangement. As a model system, complementary to the other artificial analogs of biomembranes, the wetting films of lipids offer certain advantages concerning the compromise between the stability and flexibility of the molecular structures involved in sensing. The basic principles underlaying the techniques of formation, as well as the conditions of the films stability are emphasized in the present consized review. While no limitations are imposed by the way of preparation, the films seem especially profitable in conjunction with methods for electrochemical signal transduction. In this regard some prominent examples are discussed.
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Affiliation(s)
- Valery Kochev
- Department of Atomic Physics, Sofia University Kl.Ohridsky, 5 J.D.Bourchier, Sofia 1164, Bulgaria
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Tadini Buoninsegni F, Dolfi A, Guidelli R. Two Photobioelectrochemical Applications of Self-Assembled Films on Mercury. ACTA ACUST UNITED AC 2004. [DOI: 10.1135/cccc20040292] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The homogeneous, defect-free surface of a hanging mercury drop electrode was used to self-assemble films apt for the investigation of two photobioelectrochemical systems. Monolayers of straight-chain C12-C18alkane-1-thiols were anchored to a hanging mercury drop electrode and a film of chlorophyll was self-assembled on the top of them. The dependence of the photocurrents generated by illumination of the chlorophyll film with red light, on the thickness of the alkane-1-thiol monolayer and the applied potential is discussed. The photocurrents of purple membrane fragments, adsorbed on a mixed hexadecane-1-thiol/ dioleoylphosphatidylcholine bilayer self-assembled on mercury, were investigated in the presence of sodium perchlorate, chloride and acetate. The effect of the anions on the kinetics of the light-driven proton transport by bacteriorhodopsin has been determined.
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Karabaliev M, Kochev V. Preparation of extremely thin solid supported films of lipids by the method of electrostriction. Colloids Surf B Biointerfaces 2003. [DOI: 10.1016/s0927-7765(02)00054-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Becucci L, Guidelli R, Liu Q, Bushby RJ, Evans SD. A Biomimetic Membrane Consisting of a Polyethyleneoxythiol Monolayer Anchored to Mercury with a Phospholipid Bilayer on Top. J Phys Chem B 2002. [DOI: 10.1021/jp020742+] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Dolfi A, Aloisi G, Guidelli R. Photoelectric response of purple membrane fragments adsorbed on a lipid monolayer supported by mercury and characterization of the resulting interphase. Bioelectrochemistry 2002; 57:155-66. [PMID: 12160613 DOI: 10.1016/s1567-5394(02)00117-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Purple membrane (PM) fragments were adsorbed on a dioleoylphosphatidylcholine (DOPC) monolayer supported by mercury to investigate the kinetics of light-driven proton transport by bacteriorhodopsin (bR). PM fragments were also adsorbed on a mercury-supported triethyleneoxythiol (TET) monolayer. On both monolayers, the light-on current exhibits a finite, potential dependent stationary component that decreases linearly with a positive shift in the applied potential. The light-on and light-off capacitive photocurrents were interpreted on the basis of a simple equivalent circuit, which accounts for the potential dependence of the stationary light-on current. The potential of zero stationary current is about equal to +0.010 V vs. saturated calomel electrode (SCE) on DOPC-coated mercury. The absolute potential difference across the PM fragments adsorbed at this applied potential was estimated on the basis of extrathermodynamic considerations and amounts to about +260 mV; it compares favorably with the value, +250 mV, of the transmembrane potential of zero stationary current across an oocyte plasma membrane incorporating bR [Biophys. J. 74 (1998) 403.]. The effect of the proton pumping activity of photoexcited PM fragments on the electroreduction kinetics of ubiquinone-10 incorporated in the DOPC monolayer underlying the PM fragments was investigated.
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Affiliation(s)
- Andrea Dolfi
- Department of Chemistry, Polo Scientifico, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino, Florence, Italy
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Becucci L, Moncelli MR, Guidelli R. Thallous ion movements through gramicidin channels incorporated in lipid monolayers supported by mercury. Biophys J 2002; 82:852-64. [PMID: 11806927 PMCID: PMC1301894 DOI: 10.1016/s0006-3495(02)75447-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The potential independent limiting flux of hydrated Tl(+) ions through gramicidin (GR) channels incorporated in phospholipid monolayers self assembled on a hanging mercury-drop electrode is shown to be controlled both by diffusion and by a dehydration step. Conversely, the potential independent limiting flux of dehydrated Tl(+) ions stemming from Tl amalgam electro-oxidation is exclusively controlled by diffusion of thallium atoms within the amalgam. Modulating the charge on the polar heads of dioleoylphosphatidylserine (DOPS) by changing pH affects the limiting flux of hydrated Tl(+) ions to a notable extent, primarily by electrostatic interactions. The dipole potential of DOPS and dioleoylphosphatidylcholine (DOPC), positive toward the hydrocarbon tails, does not hinder the translocation step of Tl(+) ions to such an extent as to make it rate limiting. Consequently, incorporation in the lipid monolayer of phloretin, which decreases such a positive dipole potential, does not affect the kinetics of Tl(+) flux through GR channels. In contrast, the increase in the positive dipole potential produced by the incorporation of ketocholestanol causes the translocation step to contribute to the rate of the overall process. A model providing a quantitative interpretation of the kinetics of diffusion, dehydration-hydration, translocation, and charge transfer of the Tl(+)/Tl(0)(Hg) couple through GC channels incorporated in mercury-supported phospholipid monolayers is provided. A cut-off disk model yielding the profile of the local electrostatic potential created by an array of oriented dipoles located in the lipid monolayer along the axis of a cylindrical ion channel is developed.
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Affiliation(s)
- Lucia Becucci
- Department of Chemistry, Florence University, 50121 Florence, Italy
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Zawisza I, Bilewicz R, Rosa Moncelli M, Guidelli R. Electrochemistry of Langmuir–Blodgett and self-organized monolayers of an azocrown ether, both pure and mixed with a phospholipid. J Electroanal Chem (Lausanne) 2001. [DOI: 10.1016/s0022-0728(01)00380-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Karabaliev M, Kochev V. Some electrochemical features of glassy carbon-supported thin liquid films of lecithin. Electrochem commun 2001. [DOI: 10.1016/s1388-2481(01)00171-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Park H, Oyama M, Shim YB, Okazaki S. Reduction of p-benzoquinone on lipid-modified electrodes: effect of the alkyl chain length of lipids on the electron transfer reactions. J Electroanal Chem (Lausanne) 2000. [DOI: 10.1016/s0022-0728(00)00067-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Buoninsegni FT, Herrero R, Moncelli MR. Alkanethiol monolayers and alkanethiol|phospholipid bilayers supported by mercury: an electrochemical characterization. J Electroanal Chem (Lausanne) 1998. [DOI: 10.1016/s0022-0728(98)00099-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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