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Kohl Y, William N, Elje E, Backes N, Rothbauer M, Srancikova A, Rundén-Pran E, El Yamani N, Korenstein R, Madi L, Barbul A, Kozics K, Sramkova M, Steenson K, Gabelova A, Ertl P, Dusinska M, Nelson A. Rapid identification of in vitro cell toxicity using an electrochemical membrane screening platform. Bioelectrochemistry 2023; 153:108467. [PMID: 37244203 DOI: 10.1016/j.bioelechem.2023.108467] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 04/28/2023] [Accepted: 05/15/2023] [Indexed: 05/29/2023]
Abstract
This study compares the performance and output of an electrochemical phospholipid membrane platform against respective in vitro cell-based toxicity testing methods using three toxicants of different biological action (chlorpromazine (CPZ), colchicine (COL) and methyl methanesulphonate (MMS)). Human cell lines from seven different tissues (lung, liver, kidney, placenta, intestine, immune system) were used to validate this physicochemical testing system. For the cell-based systems, the effective concentration at 50 % cell death (EC50) values are calculated. For the membrane sensor, a limit of detection (LoD) value was extracted as a quantitative parameter describing the minimum concentration of toxicant which significantly affects the structure of the phospholipid sensor membrane layer. LoD values were found to align well with the EC50 values when acute cell viability was used as an end-point and showed a similar toxicity ranking of the tested toxicants. Using the colony forming efficiency (CFE) or DNA damage as end-point, a different order of toxicity ranking was observed. The results of this study showed that the electrochemical membrane sensor generates a parameter relating to biomembrane damage, which is the predominant factor in decreasing cell viability when in vitro models are acutely exposed to toxicants. These results lead the way to using electrochemical membrane-based sensors for rapid relevant preliminary toxicity screens.
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Affiliation(s)
- Yvonne Kohl
- Fraunhofer Institute for Biomedical Engineering IBMT, Joseph-von-Fraunhofer-Weg 1, Sulzbach 66280, Germany.
| | - Nicola William
- School of Chemistry and Faculty of Engineering and Physical Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom.
| | - Elisabeth Elje
- NILU-Norwegian Institute for Air Research, Department for Environmental Chemistry, Health Effects Laboratory, Instituttveien 18, Kjeller 2007, Norway; Faculty of Medicine, Institute of Basic Medical Sciences Department of Molecular Medicine, University of Oslo, Sognsvannsveien 9, Oslo 0372, Norway.
| | - Nadine Backes
- Fraunhofer Institute for Biomedical Engineering IBMT, Joseph-von-Fraunhofer-Weg 1, Sulzbach 66280, Germany
| | - Mario Rothbauer
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, 1060 Vienna, Austria.
| | - Annamaria Srancikova
- Department of Nanobiology, Cancer Research Institute, Biomedical Research Center of the Slovak Academy of Sciences, Dubravska Cesta 9, Bratislava 84505, Slovakia.
| | - Elise Rundén-Pran
- NILU-Norwegian Institute for Air Research, Department for Environmental Chemistry, Health Effects Laboratory, Instituttveien 18, Kjeller 2007, Norway.
| | - Naouale El Yamani
- NILU-Norwegian Institute for Air Research, Department for Environmental Chemistry, Health Effects Laboratory, Instituttveien 18, Kjeller 2007, Norway
| | - Rafi Korenstein
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, 69978, Israel.
| | - Lea Madi
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, 69978, Israel.
| | - Alexander Barbul
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, 69978, Israel.
| | - Katarina Kozics
- Department of Nanobiology, Cancer Research Institute, Biomedical Research Center of the Slovak Academy of Sciences, Dubravska Cesta 9, Bratislava 84505, Slovakia.
| | - Monika Sramkova
- Department of Nanobiology, Cancer Research Institute, Biomedical Research Center of the Slovak Academy of Sciences, Dubravska Cesta 9, Bratislava 84505, Slovakia.
| | - Karen Steenson
- School of Chemistry and Faculty of Engineering and Physical Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom.
| | - Alena Gabelova
- Department of Nanobiology, Cancer Research Institute, Biomedical Research Center of the Slovak Academy of Sciences, Dubravska Cesta 9, Bratislava 84505, Slovakia.
| | - Peter Ertl
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, 1060 Vienna, Austria; Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9, 1060 Vienna, Austria.
| | - Maria Dusinska
- NILU-Norwegian Institute for Air Research, Department for Environmental Chemistry, Health Effects Laboratory, Instituttveien 18, Kjeller 2007, Norway.
| | - Andrew Nelson
- School of Chemistry and Faculty of Engineering and Physical Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom.
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Labbé E, Buriez O. Electrode‐supported and free‐standing bilayer lipid membranes: Formation and uses in molecular electrochemistry. ELECTROCHEMICAL SCIENCE ADVANCES 2021. [DOI: 10.1002/elsa.202100170] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Affiliation(s)
- Eric Labbé
- PASTEUR Département de Chimie Ecole Normale Supérieure PSL University Sorbonne Université CNRS Paris 75005 France
| | - Olivier Buriez
- PASTEUR Département de Chimie Ecole Normale Supérieure PSL University Sorbonne Université CNRS Paris 75005 France
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William N, Bamidoro F, Beales PA, Drummond-Brydson R, Hondow N, Key S, Kulak A, Walsh AC, Winter S, Nelson LA. Tuning stable noble metal nanoparticles dispersions to moderate their interaction with model membranes. J Colloid Interface Sci 2021; 594:101-112. [PMID: 33756358 DOI: 10.1016/j.jcis.2021.03.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 02/26/2021] [Accepted: 03/01/2021] [Indexed: 12/19/2022]
Abstract
HYPOTHESIS The properties of stable gold (Au) nanoparticle dispersions can be tuned to alter their activity towards biomembrane models. EXPERIMENTS Au nanoparticle coating techniques together with rapid electrochemical screens of a phospholipid layer on fabricated mercury (Hg) on platinum (Pt) electrode have been used to moderate the phospholipid layer activity of Au nanoparticle dispersions. Screening results for Au nanoparticle dispersions were intercalibrated with phospholipid large unilamellar vesicle (LUV) interactions using a carboxyfluorescein (CF) leakage assay. All nanoparticle dispersions were characterised for size, by dynamic light scattering (DLS) and transmission electron microscopy (TEM). FINDINGS Commercial and high quality home synthesised Au nanoparticle dispersions are phospholipid monolayer active whereas Ag nanoparticle dispersions are not. If Au nanoparticles are coated with a thin layer of Ag then the particle/lipid interaction is suppressed. The electrochemical assays of the lipid layer activity of Au nanoparticle dispersions align with LUV leakage assays of the same. Au nanoparticles of decreasing size and increasing dispersion concentration showed a stronger phospholipid monolayer/bilayer interaction. Treating Au nanoparticles with cell culture medium and incubation of Au nanoparticle dispersions in phosphate buffered saline (PBS) solutions removes their phospholipid layer interaction.
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Affiliation(s)
- Nicola William
- School of Chemistry, University of Leeds, Leeds LS2 9JT, UK
| | - Faith Bamidoro
- School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK
| | - Paul A Beales
- School of Chemistry, University of Leeds, Leeds LS2 9JT, UK; Bragg Centre for Materials Research, University of Leeds, Leeds LS2 9JT, UK; Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, UK
| | - Rik Drummond-Brydson
- School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK; Bragg Centre for Materials Research, University of Leeds, Leeds LS2 9JT, UK
| | - Nicole Hondow
- School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK; Bragg Centre for Materials Research, University of Leeds, Leeds LS2 9JT, UK
| | - Sarah Key
- School of Chemistry, University of Leeds, Leeds LS2 9JT, UK
| | | | | | - Sophia Winter
- School of Chemistry, University of Leeds, Leeds LS2 9JT, UK
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Owen J, Kuznecovs M, Bhamji R, William N, Domenech-Garcia N, Hesler M, Knoll T, Kohl Y, Nelson A, Kapur N. High-throughput electrochemical sensing platform for screening nanomaterial-biomembrane interactions. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:025002. [PMID: 32113378 DOI: 10.1063/1.5131562] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Accepted: 01/23/2020] [Indexed: 06/10/2023]
Abstract
A high-throughput, automated screening platform has been developed for the assessment of biological membrane damage caused by nanomaterials. Membrane damage is detected using the technique of analyzing capacitance-current peak changes obtained through rapid cyclic voltammetry measurements of a phospholipid self-assembled monolayer formed on a mercury film deposited onto a microfabricated platinum electrode after the interaction of a biomembrane-active species. To significantly improve wider usability of the screening technique, a compact, high-throughput screening platform was designed, integrating the monolayer-supporting microfabricated electrode into a microfluidic flow cell, with bespoke pumps used for precise, automated control of fluid flow. Chlorpromazine, a tricyclic antidepressant, and a citrate-coated 50 nm diameter gold nanomaterial (AuNM) were screened to successfully demonstrate the platform's viability for high-throughput screening. Chlorpromazine and the AuNM showed interactions with a 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) monolayer at concentrations in excess of 1 µmol dm-3. Biological validity of the electrochemically measured interaction of chlorpromazine with DOPC monolayers was confirmed through quantitative comparisons with HepG2 and A549 cytotoxicity assays. The platform also demonstrated desirable performance for high-throughput screening, with membrane interactions detected in <6 min per assay. Automation contributed to this significantly by reducing the required operating skill level when using the technique and minimizing fluid consumption.
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Affiliation(s)
- Joshua Owen
- Institute of Thermofluids, School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Maksims Kuznecovs
- Institute of Thermofluids, School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Raeesa Bhamji
- School of Chemistry, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Nicola William
- School of Chemistry, University of Leeds, Leeds LS2 9JT, United Kingdom
| | | | - Michelle Hesler
- Fraunhofer Institute for Biomedical Engineering IBMT, Joseph-von-Fraunhofer-Weg 1, 66280 Sulzbach, Germany
| | - Thorsten Knoll
- Fraunhofer Institute for Biomedical Engineering IBMT, Joseph-von-Fraunhofer-Weg 1, 66280 Sulzbach, Germany
| | - Yvonne Kohl
- Fraunhofer Institute for Biomedical Engineering IBMT, Joseph-von-Fraunhofer-Weg 1, 66280 Sulzbach, Germany
| | - Andrew Nelson
- School of Chemistry, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Nikil Kapur
- Institute of Thermofluids, School of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, United Kingdom
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William N, Nelson A, Gutsell S, Hodges G, Rabone J, Teixeira A. Hg-supported phospholipid monolayer as rapid screening device for low molecular weight narcotic compounds in water. Anal Chim Acta 2019; 1069:98-107. [PMID: 31084746 DOI: 10.1016/j.aca.2019.04.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 04/04/2019] [Accepted: 04/09/2019] [Indexed: 11/27/2022]
Abstract
This study positions the fabricated Pt/Hg-supported phospholipid sensor element in the context of more conventional biomembrane-based screening platforms. The technology has been used together with immobilised artificial membrane (IAM) chromatography and COSMOmic simulation methods to screen the interaction of a series of low molecular weight narcotic organic compounds in water with phosphatidylcholine (PC) membranes. For these chemicals it is shown that toxicity to aquatic species is related to compound hydrophobicity which is associated with compound accumulation in the phospholipid membrane as modelled by IAM chromatography measurements and COSMOmic simulations. In contrast, the Hg-supported dioleoyl phosphatidylcholine (DOPC) sensor element records membrane damage/modification which is indirectly related to general toxicity and directly related to compound structure. Electrochemical limit of detection (LoD) values depend on molecular structure and range from 20 μmolL-1 for substituted phenols to 23 mmolL-1 for aliphatics. Rapid cyclic voltammetry (RCV) "fingerprints" showed that the major structural classes of compounds: alkyl/chlorobenzenes, substituted phenols, quaternary ammonium compounds and neutral amines interacted distinctively with the DOPC on Hg and that these observations correlated with and supported those predicted by the COSMOmic simulations of the compound/DMPC association. In addition, the compatibility of the electrochemical and COSMOmic methods validates the electrochemical device as a meaningful high throughput technology to screen compounds in water and report on the mechanistic details of their interaction with phospholipid layers.
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Affiliation(s)
- N William
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| | - A Nelson
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK.
| | - S Gutsell
- Safety and Environmental Assurance Centre, Unilever, Colworth Science Park, Sharnbrook, UK
| | - G Hodges
- Safety and Environmental Assurance Centre, Unilever, Colworth Science Park, Sharnbrook, UK
| | - J Rabone
- Safety and Environmental Assurance Centre, Unilever, Colworth Science Park, Sharnbrook, UK
| | - A Teixeira
- Safety and Environmental Assurance Centre, Unilever, Colworth Science Park, Sharnbrook, UK
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6
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Bi H, Wang X, Han X, Voïtchovsky K. Impact of Electric Fields on the Nanoscale Behavior of Lipid Monolayers at the Surface of Graphite in Solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:9561-9571. [PMID: 30028144 DOI: 10.1021/acs.langmuir.8b01631] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The nanoscale organization and dynamics of lipid molecules in self-assembled membranes is central to the biological function of cells and in the technological development of synthetic lipid structures as well as in devices such as biosensors. Here, we explore the nanoscale molecular arrangement and dynamics of lipids assembled in monolayers at the surface of highly ordered pyrolytic graphite (HOPG), in different ionic solutions, and under electrical potentials. Using a combination of atomic force microscopy and fluorescence recovery after photobleaching, we show that HOPG is able to support fully formed and fluid lipid membranes, but mesoscale order and corrugations can be observed depending on the type of the lipid considered (1,2-dioleoyl- sn-glycero-3-phosphocholine, 1,2-dioleoyl- sn-glycero-3-phospho-l-serine (DOPS), and 1,2-dioleoyl-3-trimethylammoniumpropane) and the ion present (Na+, Ca2+, Cl-). Interfacial solvation forces and ion-specific effects dominate over the electrostatic changes induced by moderate electric fields (±1.0 V vs Ag/AgCl reference electrode) with particularly marked effects in the presence of calcium, and for DOPS. Our results provide insights into the interplay between the molecular, ionic, and electrostatic interactions and the formation of dynamical ordered structures in fluid lipid membranes.
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Affiliation(s)
- Hongmei Bi
- College of Science , Heilongjiang Bayi Agricultural University , Daqing 163319 , China
| | - Xuejing Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering , Harbin Institute of Technology , Harbin 150001 , China
| | - Xiaojun Han
- State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering , Harbin Institute of Technology , Harbin 150001 , China
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8
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Tomková H, Sokolová R, Opletal T, Kučerová P, Kučera L, Součková J, Skopalová J, Barták P. Electrochemical sensor based on phospholipid modified glassy carbon electrode - determination of paraquat. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2017.12.048] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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9
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The electrochemical phase behaviour of chemically asymmetric lipid bilayers supported at Au(111) electrodes. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2017.11.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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10
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Electrochemical characterization of a mixed lipid monolayer supported on Au(111) electrodes with implications for doxorubicin delivery. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2018.02.056] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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11
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Sanver D, Murray BS, Sadeghpour A, Rappolt M, Nelson AL. Experimental Modeling of Flavonoid-Biomembrane Interactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:13234-13243. [PMID: 27951697 DOI: 10.1021/acs.langmuir.6b02219] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Nonspecific interactions of flavonoids with lipids can alter the membrane's features (e.g., thickness and fluctuations) as well as influence their therapeutic potentials. However, relatively little is known about the details of how flavonoids interact with lipid components. Structure-dependent interactions of a variety of flavonoids with phospholipid monolayers on a mercury (Hg) film electrode were established by rapid cyclic voltammetry (RCV). The data revealed that flavonoids adopting a planar configuration altered the membrane properties more significantly than nonplanar flavonoids. Quercetin, rutin, and tiliroside were selected for follow-up experiments with Langmuir monolayers, Brewster angle microscopy (BAM), and small-angle X-ray scattering (SAXS). Relaxation phenomena in DOPC monolayers and visualization of the surface with BAM revealed a pronounced monolayer stabilization effect with both quercetin and tiliroside, whereas rutin disrupted the monolayer structure rendering the surface entirely smooth. SAXS showed a monotonous membrane thinning for all compounds studied associated with an increase in the mean fluctuations of the membrane. Rutin, quercetin, and tiliroside decreased the bilayer thickness of DOPC by ∼0.45, 0.8, and 1.1 Å at 6 mol %, respectively. In addition to the novelty of using lipid monolayers to systematically characterize the structure-activity relationship (SAR) of a variety of flavonoids, this is the first report investigating the effect of tiliroside with biomimetic membrane models. All the flavonoids studied are believed to be localized in the lipid/water interface region. Both this localization and the membrane perturbations have implications for their therapeutic activity.
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Affiliation(s)
- Didem Sanver
- Department of Food Engineering, Necmettin Erbakan University , Koycegiz Kampusu, 420701 Konya, Turkey
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12
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Maher S, Basit H, Forster RJ, Keyes TE. Micron dimensioned cavity array supported lipid bilayers for the electrochemical investigation of ionophore activity. Bioelectrochemistry 2016; 112:16-23. [DOI: 10.1016/j.bioelechem.2016.07.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Revised: 07/04/2016] [Accepted: 07/04/2016] [Indexed: 12/18/2022]
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13
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Levine ZA, DeNardis NI, Vernier PT. Phospholipid and Hydrocarbon Interactions with a Charged Electrode Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:2808-2819. [PMID: 26927605 DOI: 10.1021/acs.langmuir.5b04090] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Using a combination of molecular dynamics simulations and experiments we examined the interactions of alkanes and phospholipids at charged interfaces in order to understand how interfacial charge densities affect the association of these two representative molecules with electrodes. Consistent with theory and experiment, these model systems reveal interfacial associations mediated through a combination of Coulombic and van der Waals forces. van der Waals forces, in particular, mediate rapid binding of decane to neutral electrodes. No decane binding was observed at high surface charge densities because of interfacial water polarization, which screens hydrophobic attractions. The positively charged choline moiety of the phospholipid palmitoyloleoylphosphatidylcholine (POPC) is primarily responsible for POPC attraction by a moderately negatively charged electrode. The hydrocarbon tails of POPC interact with the hydrophobic electrode interface similarly to decane. Previously reported electrochemical results confirm these findings by demonstrating bipolar displacement currents from PC vesicles adhering to moderately negatively charged interfaces, originating from the choline interactions observed in simulations. At more negatively charged interfaces, choline-to-surface binding was stronger. In both simulations and experiments the maximal interaction of anionic PS occurs with a positively charged interface, provided that the electrostatic forces outweigh local Lennard-Jones interactions. Direct comparisons between the binding affinities measured in experiments and those obtained in simulations reveal previously unobserved atomic interactions that facilitate lipid vesicle adhesion to charged interfaces. Moreover, the implementation of a charged interface in molecular dynamics simulations provides an alternative method for the generation of large electric fields across phospholipid bilayers, especially for systems with periodic boundary conditions, and may be useful for simulations of membrane electropermeabilization.
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Affiliation(s)
| | - Nadica Ivošević DeNardis
- Division for Marine and Environmental Research, Ruđer Bošković Institute , 10000 Zagreb, Croatia
| | - P Thomas Vernier
- Frank Reidy Research Center for Bioelectrics, Old Dominion University , Norfolk, Virginia 23508, United States
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14
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Lecompte MF, Gaibelet G, Lebrun C, Tercé F, Collet X, Orlowski S. Cholesterol and Sphingomyelin-Containing Model Condensed Lipid Monolayers: Heterogeneities Involving Ordered Microdomains Assessed by Two Cholesterol Derivatives. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:11921-11931. [PMID: 26466013 DOI: 10.1021/acs.langmuir.5b02646] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Lipid monolayers are often considered as model membranes, but they are also the physiologic lipid part of the peripheral envelope of lipoproteins and cytosolic lipid bodies. However, their structural organization is still rather elusive, in particular when both cholesterol and sphingomyelin are present. To investigate such structural organization of hemimembranes, we measured, using alternative current voltammetry, the differential capacitance of condensed phosphatidylcholine-based monolayers as a function of applied potential, which is sensitive to their lipid composition and molecular arrangement. Especially, monolayers containing both sphingomyelin and cholesterol, at 15% w/w, presented specific characteristics of the differential capacitance versus potential curves recorded, which was indicative of specific interactions between these two lipid components. We then compared the behavior of two cholesterol derivatives (at 15% w/w), 21-methylpyrenyl-cholesterol (Pyr-met-Chol) and 22-nitrobenzoxadiazole-cholesterol (NBD-Chol), with that of cholesterol when present in model monolayers. Indeed, these two probes were chosen because of previous findings reporting opposite behaviors within bilayer membranes regarding their interaction with ordered lipids, with only Pyr-met-Chol mimicking cholesterol well. Remarkably, in monolayers containing sphingomyelin or not, Pyr-met-Chol and NBD-Chol presented contrasting behaviors, and Pyr-met-Chol mimicked cholesterol only in the presence of sphingomyelin. These two observations (i.e., optimal amounts of sphingomyelin and cholesterol, and the ability to discriminate between Pyr-met-Chol and NBD-Chol) can be interpreted by the existence of heterogeneities including ordered patches in sphingomyelin- and cholesterol-containing monolayers. Since such monolayer lipid arrangement shares some properties with the raft-type lipid microdomains well-described in sphingomyelin- and cholesterol-containing bilayer membranes, our data thus strongly suggest the existence of compact and ordered microdomains in model lipid monolayers.
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Affiliation(s)
| | - Gérald Gaibelet
- INSERM U563, CHU Purpan, 31024 Toulouse cedex 3, France
- SB2SM and UMR8221/9198 CNRS, IBiTec-Saclay, CEA, 91191 Gif-sur-Yvette cedex, France
| | | | - François Tercé
- INSERM U1048, Université Toulouse III, UMR 1048, 31400 Toulouse, France
| | - Xavier Collet
- INSERM U1048, Université Toulouse III, UMR 1048, 31400 Toulouse, France
| | - Stéphane Orlowski
- INSERM U563, CHU Purpan, 31024 Toulouse cedex 3, France
- SB2SM and UMR8221/9198 CNRS, IBiTec-Saclay, CEA, 91191 Gif-sur-Yvette cedex, France
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15
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Jahnke JP, Bazan GC, Sumner JJ. Effect of Modified Phospholipid Bilayers on the Electrochemical Activity of a Membrane-Spanning Conjugated Oligoelectrolyte. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:11613-11620. [PMID: 26422050 DOI: 10.1021/acs.langmuir.5b03093] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The incorporation and electrochemical activity of a conjugated oligoelectrolyte (COE) in model phospholipid bilayers have been characterized using cyclic voltammetry and UV-vis absorption measurements. Several other modifiers were also incorporated into the phospholipid membranes to alter properties such as charge and alkyl chain disorder. Using potassium ferricyanide to measure charge transport, it was observed that bilayers that contained cholic acid, a negatively charged additive that also promotes alkyl chain disorder, had higher COE uptake and charge permeability than unmodified bilayers. In contrast, when the positively charged choline was incorporated, charge permeability decreased and COE uptake was similar to that of unmodified bilayers. The incorporation of cholesterol at low concentrations within the phospholipid membranes was shown to enhance the COE's effectiveness at increasing membrane charge permeability without increasing the COE concentration in the bilayer. Higher concentrations of cholesterol reduce membrane fluidity and membrane charge permeability. Collectively, these results demonstrate that changes in phospholipid membrane charge permeability upon COE incorporation depend not only on the concentration in the membrane but also on interactions with the phospholipid bilayer and other additives present in the membranes. This approach of manipulating the properties of phospholipid membranes to understand COE interactions is applicable to understanding the behavior of a wide range of molecules that impart useful properties to phospholipid membranes.
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Affiliation(s)
- Justin P Jahnke
- U.S. Army Research Laboratory Sensors & Electron Devices Directorate, Adelphi, Maryland 20783, United States
| | - Guillermo C Bazan
- Department of Chemistry and Biochemistry, University of California , Santa Barbara, California 93106, United States
| | - James J Sumner
- U.S. Army Research Laboratory Sensors & Electron Devices Directorate, Adelphi, Maryland 20783, United States
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16
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Cell adhesion and spreading at a charged interface: Insight into the mechanism using surface techniques and mathematical modelling. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.07.068] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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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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18
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Role of electrolyte in the occurrence of the voltage induced phase transitions in a dioleoyl phosphatidylcholine monolayer on Hg. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2014.12.077] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Madrid E, Horswell SL. Effect of Electric Field on Structure and Dynamics of Bilayers Formed From Anionic Phospholipids. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.01.035] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Švecová H, Součková J, Pyszková M, Svítková J, Labuda J, Skopalová J, Barták P. Phospholipids improve selectivity and sensitivity of carbon electrodes: Determination of pesticide Paraquat. EUR J LIPID SCI TECH 2014. [DOI: 10.1002/ejlt.201300389] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Hana Švecová
- RCPTM, Department of Analytical Chemistry, Faculty of Science; Palacky University; Olomouc Czech Republic
| | - Jitka Součková
- Department of Analytical Chemistry; Faculty of Science; Palacky University; Olomouc Czech Republic
| | - Michaela Pyszková
- Department of Analytical Chemistry; Faculty of Science; Palacky University; Olomouc Czech Republic
| | - Jana Svítková
- Institute of Analytical Chemistry, Faculty of Chemical and Food Technology; Slovak University of Technology in Bratislava; Bratislava Slovak Republic
| | - Ján Labuda
- Institute of Analytical Chemistry, Faculty of Chemical and Food Technology; Slovak University of Technology in Bratislava; Bratislava Slovak Republic
| | - Jana Skopalová
- Department of Analytical Chemistry; Faculty of Science; Palacky University; Olomouc Czech Republic
| | - Petr Barták
- RCPTM, Department of Analytical Chemistry, Faculty of Science; Palacky University; Olomouc Czech Republic
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21
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The GM1 Ganglioside Forms GM1-Rich Gel Phase Microdomains within Lipid Rafts. COATINGS 2014. [DOI: 10.3390/coatings4030450] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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22
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Gordillo GJ, Krpetić Z, Brust M. Interactions of gold nanoparticles with a phospholipid monolayer membrane on mercury. ACS NANO 2014; 8:6074-80. [PMID: 24878256 DOI: 10.1021/nn501395e] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
It is demonstrated that a compact monolayer of 1,2-dioleoyl-sn-glycero-3-phosphocholine adsorbed to a hanging mercury drop electrode can serve as a simple electrochemical model system to study biomembrane penetration by gold nanoparticles. The hydrogen redox-chemistry characteristic of ligand-stabilized gold nanoparticles in molecularly close contact with a mercury electrode is used as an indicator of membrane penetration. Results for water-dispersible gold nanoparticles of two different sizes are reported, and comparisons are made with the cellular uptake of the same preparations of nanoparticles by a common human fibroblast cell line. The experimental system described here can be used to study physicochemical aspects of membrane penetration in the absence of complex biological mechanisms, and it could also be a starting point for the development of a test bed for the toxicity of nanomaterials.
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Affiliation(s)
- Gabriel J Gordillo
- Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, INQUIMAE (CONICET), Universidad de Buenos Aires , Ciudad Universitaria, Pabellón 2, 1428, Buenos Aires, Argentina
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23
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Vakurov A, Galluzzi M, Podestà A, Gamper N, Nelson AL, Connell SDA. Direct characterization of fluid lipid assemblies on mercury in electric fields. ACS NANO 2014; 8:3242-3250. [PMID: 24625246 DOI: 10.1021/nn4037267] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Phospholipid monolayers on mercury (Hg) surfaces have received substantial and extensive scientific interest not only because of their use as a biomembrane model but also for their application as a successful toxicity-sensing element. The monolayers show characteristic and very reproducible phase transitions manifest as consecutive voltammetric peaks in response to applied transverse electric fields. Unfortunately, apart from the results of simulation studies, there is a lack of data on the lipid phase structures to help interpret these voltammetric peaks. In this paper we report on the direct measurement of the structural changes underlying the phase transitions of phospholipid layers of dioleoyl phosphatidylcholine (DOPC) at electrified Hg surfaces using atomic force microscopy force-distance techniques. These direct measurements enable a description of the following structural changes in fluid lipid assemblies on a liquid electrode within an increasing transverse electric field. At about -1.0 V (vs Ag/AgCl) a field-facilitated ingress of ions and water into the monolayer results in a phase transition to a structured 2D emulsion. This is followed by a further phase transition at more negative potentials involving the readsorption of bilayer patches. At stronger values of field the bilayer patches form semivesicles, which subsequently collapse to form a monolayer of uncertain composition at very negative potentials. The observation that a monolayer on Hg converts to a bilayer by increasing the applied potential has allowed techniques to be developed for preparing and characterizing a near-continuous DOPC bilayer on Hg in an applied potential window within -1.0 and -1.4 V (vs Ag/AgCl).
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Zhang S, Chen R, Malhotra G, Critchley K, Vakurov A, Nelson A. Electrochemical modelling of QD-phospholipid interactions. J Colloid Interface Sci 2014; 420:9-14. [DOI: 10.1016/j.jcis.2013.12.054] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Revised: 12/20/2013] [Accepted: 12/23/2013] [Indexed: 11/25/2022]
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25
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Electrochemical screening of biomembrane-active compounds in water. Anal Chim Acta 2014; 813:83-9. [DOI: 10.1016/j.aca.2014.01.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Revised: 12/05/2013] [Accepted: 01/03/2014] [Indexed: 11/23/2022]
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26
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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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Galluzzi M, Zhang S, Mohamadi S, Vakurov A, Podestà A, Nelson A. Interaction of imidazolium-based room-temperature ionic liquids with DOPC phospholipid monolayers: electrochemical study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:6573-6581. [PMID: 23654287 DOI: 10.1021/la400923d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
To test the biocompatible character of room-temperature ionic liquids (ILs), the interaction of various ILs with biological membrane (biomembrane) models was studied in this work. Dioleoyl phosphatidylcholine (DOPC) adsorbed on a mercury (Hg) electrode forms an impermeable defect-free monolayer which is a well established biomembrane model, prone to be studied by electrochemical techniques. We have monitored the modifications of the Hg supported monolayer caused by ILs using rapid cyclic voltammetry (RCV), alternating current voltammetry (ACV), and electrochemical impedance spectroscopy (EIS). A series of imidazolium-based ILs were investigated whose interaction highlighted the role of anion and lateral side chain of cation during the interaction with DOPC monolayers. It was shown that the hydrophobic and lipophilic character of the IL cations is a primary factor responsible for this interaction. Hg-supported monolayers provide an accurate analysis of the behavior of ILs at the interface of a biomembrane leading to a comprehensive understanding of the interaction mechanisms involved. At the same time, these experiments show that the Hg-phospholipid model is an effective toxicity sensing technique as shown by the correlation between literature in vivo toxicity data and the data from this study.
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28
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Josypčuk B, Fojta M, Yosypchuk O. Thiolate monolayers formed on different amalgam electrodes. Part II: Properties and application. J Electroanal Chem (Lausanne) 2013. [DOI: 10.1016/j.jelechem.2013.02.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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29
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Madrid E, Horswell SL. Effect of headgroup on the physicochemical properties of phospholipid bilayers in electric fields: size matters. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:1695-1708. [PMID: 23331178 DOI: 10.1021/la304455d] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The effect of molecular structure on ensemble structure of phospholipid films has been investigated. Bilayers of dimyristoyl phosphatidylethanolamine (DMPE) were prepared on Au(111) electrodes using Langmuir-Blodgett and Langmuir-Schaeffer deposition. Capacitance and charge density measurements were used to investigate the adsorption behavior and barrier properties of the lipid bilayers. In situ polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS) was employed to investigate the organization of the molecules within the bilayer. DMPE bilayers exhibit lower capacitance than bilayers formed from the related lipid, dimyristoyl phosphatidylcholine (DMPC). The infrared data show that these results can be explained by structural differences between the bilayers formed from each molecule. DMPE organizes into bilayers with hydrocarbon chains tilted at a smaller angle to the surface normal, which results in a thicker film. The hydrocarbon chains contain few conformational defects. Spectra in the carbonyl and phosphate stretching mode regions indicate low solvent content of DMPE films. Both of these effects combine to produce films with lower capacitance and enhanced barrier properties. The results are explained in terms of the differences in structure between the constituent molecules.
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Affiliation(s)
- Elena Madrid
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
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Ivošević DeNardis N, Ružić I, Pečar-Ilić J, El Shawish S, Ziherl P. Reaction kinetics and mechanical models of liposome adhesion at charged interface. Bioelectrochemistry 2012; 88:48-56. [DOI: 10.1016/j.bioelechem.2012.05.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2011] [Revised: 04/30/2012] [Accepted: 05/01/2012] [Indexed: 11/30/2022]
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31
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DeNardis NI, Žutić V, Svetličić V, Frkanec R. Adhesion Signals of Phospholipid Vesicles at an Electrified Interface. J Membr Biol 2012; 245:573-82. [DOI: 10.1007/s00232-012-9469-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Accepted: 06/24/2012] [Indexed: 10/28/2022]
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32
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Hermes M, Czesnick C, Stremlau S, Stöhr C, Scholz F. Effect of NO on the adhesion–spreading of DMPC and DOPC liposomes on electrodes, and the partition of NO between an aqueous phase and DMPC liposomes. J Electroanal Chem (Lausanne) 2012. [DOI: 10.1016/j.jelechem.2012.02.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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Vakurov A, Brydson R, Nelson A. Electrochemical modeling of the silica nanoparticle-biomembrane interaction. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:1246-1255. [PMID: 22142270 DOI: 10.1021/la203568n] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The interaction of amorphous colloidal silica (SiO(2)) nanoparticles of well-defined sizes with a dioleoyl phosphatidylcholine (DOPC) monolayer on a mercury (Hg) film electrode has been investigated. It was shown using electrochemical methods and microcalorimetry that particles interact with the monolayer, and the electrochemical data shows that the extent of interaction is inversely proportional to the particle size. Scanning electron microscopy (SEM) images of the electrode-supported monolayers following exposure to the particles shows that the nanoparticles bind to the DOPC monolayer irrespective of their size, forming a particle monolayer on the DOPC surface. A one-parameter model was developed to describe the electrochemical results where the fitted parameter is an interfacial layer thickness (3.2 nm). The model is based on the adsorptive interactions operating within this interfacial layer that are independent of the solution pH and solution ionic strength. The evidence implies that the most significant forces determining the interactions are van der Waals in character.
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Affiliation(s)
- Alexander Vakurov
- Centre for Molecular Nanoscience (CMNS), School of Chemistry, SPEME, University of Leeds LS2 9JT, UK.
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Hermes M, Scholz F, Härdtner C, Walther R, Schild L, Wolke C, Lendeckel U. Electrochemical signals of mitochondria: a new probe of their membrane properties. Angew Chem Int Ed Engl 2011; 50:6872-5. [PMID: 21656880 DOI: 10.1002/anie.201101235] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2011] [Revised: 05/04/2011] [Indexed: 11/07/2022]
Affiliation(s)
- Michael Hermes
- Institut für Biochemie, Universität Greifswald, Felix-Hausdorff-Strasse 4, 17487 Greifswald, Germany
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Hermes M, Scholz F, Härdtner C, Walther R, Schild L, Wolke C, Lendeckel U. Electrochemical Signals of Mitochondria: A New Probe of Their Membrane Properties. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201101235] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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37
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High throughput systems for screening biomembrane interactions on fabricated mercury film electrodes. J APPL ELECTROCHEM 2011. [DOI: 10.1007/s10800-011-0319-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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38
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Yosypchuk B, Mareček V. Properties of thiolate monolayers formed on different amalgam electrodes. J Electroanal Chem (Lausanne) 2011. [DOI: 10.1016/j.jelechem.2011.01.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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