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Lebègue E, Smida H, Flinois T, Vié V, Lagrost C, Barrière F. An optimal surface concentration of pure cardiolipin deposited onto glassy carbon electrode promoting the direct electron transfer of cytochrome-c. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2017.12.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Sarangi NK, Patnaik A. L-Tryptophan-Induced Electron Transport across Supported Lipid Bilayers: an Alkyl-Chain Tilt-Angle, and Bilayer-Symmetry Dependence. Chemphyschem 2012; 13:4258-70. [DOI: 10.1002/cphc.201200655] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2012] [Revised: 09/20/2012] [Indexed: 11/11/2022]
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Brunsen A, Díaz C, Pietrasanta LI, Yameen B, Ceolín M, Soler-Illia GJAA, Azzaroni O. Proton and calcium-gated ionic mesochannels: phosphate-bearing polymer brushes hosted in mesoporous thin films as biomimetic interfacial architectures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:3583-3592. [PMID: 22309103 DOI: 10.1021/la204854r] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Rational construction of interfaces based on multicomponent responsive systems in which molecular transport is mediated by structures of nanoscale dimensions has become a very fertile research area in biomimetic supramolecular chemistry. Herein, we describe the creation of hybrid mesostructured interfaces with reversible gate-like transport properties that can be controlled by chemical inputs, such as protons or calcium ions. This was accomplished by taking advantage of the surface-initiated polymerization of 2-(methacryloyloxy)ethyl phosphate (MEP) monomer units into and onto mesoporous silica thin films. In this way, phosphate-bearing polymer brushes were used as "gatekeepers" located not only on the outer surface of mesoporous thin films but also in the inner environment of the porous scaffold. Pore-confined PMEP brushes respond to the external triggering chemical signals not only by altering their physicochemical properties but also by switching the transport properties of the mesoporous film. The ion-gate response/operation was based on the protonation and/or chelation of phosphate monomer units in which the polymer brush works as an off-on switch in response to the presence of protons or Ca(2+) ions. The hybrid meso-architectured interface and their functional features were studied by a combination of experimental techniques including ellipso-porosimetry, cyclic voltammetry, X-ray reflectivity, grazing incidence small-angle X-ray scattering, X-ray photoelectron spectroscopy, and in situ atomic force microscopy. In this context, we believe that the integration of stimuli-responsive polymer brushes into nanoscopic supramolecular architectures would provide new routes toward multifunctional biomimetic nanosystems displaying transport properties similar to those encountered in biological ligand-gated ion channels.
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Affiliation(s)
- Annette Brunsen
- Gerencia Química, Comisión Nacional de Energía Atómica, Argentina
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Jaklová Dytrtová J, Navrátil T, Mareček V. Phospholipid layer stabilization via Yb(III) on ITIES and facilitated K(I) transport. ACTA ACUST UNITED AC 2012. [DOI: 10.1135/cccc2011149] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The stabilization of lecithin layer physically adsorbed on the interface between two immiscible electrolyte solutions (ITIES) using addition of Yb3+ to the aqueous phase was studied using cyclic voltammetry. Stability of this layer was evaluated according to the time of the layer formation; the optimal time amounted to 180 s. The stability of the layer as a function of the potential applied on the system during the layer formation was investigated. The behavior of the monolayer during the layer polarization was studied by the facilitated K+ transport using dibenzo-18-crown-6. The stoichiometry of Yb/anion/lecithin complexes was investigated using electrospray ionization mass spectrometry (ESI-MS).
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LI AX, CUI XQ, YANG F, YANG XR. Interaction Between F-Actin and Negatively Charged Lipids Membrane. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2009. [DOI: 10.1016/s1872-2040(08)60080-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Hwang S, Lee BS, Chi YS, Kwak J, Choi IS, Lee SG. Faradaic impedance titration and control of electron transfer of 1-(12-mercaptododecyl)imidazole monolayer on a gold electrode. Electrochim Acta 2008. [DOI: 10.1016/j.electacta.2007.10.043] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Karabaliev M. Effects of divalent cations on the formation and structure of solid supported lipid films. Bioelectrochemistry 2007; 71:54-9. [PMID: 17383944 DOI: 10.1016/j.bioelechem.2007.02.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2006] [Revised: 01/23/2007] [Accepted: 02/16/2007] [Indexed: 11/25/2022]
Abstract
The interaction of glassy carbon-supported thin wetting films of lecithin with some divalent cations is investigated by impedimetry and voltammetry. The influence of Ca2+, Mg2+, and Mn2+ on the film structure is explored in two different cases--the divalent cations are added to the electrolyte either before or after the formation of the film. When the film has been previously formed, the addition of divalent cations in millimolar concentrations leads to changes in the passive electrical parameters and the blocking properties of the films. On the one hand the dielectric properties of the film measured in 0.1 M KCl seem to improve after the interaction with divalent cations--the film capacitance decreases, the resistance and resistivity of the film increase. On the other hand the increase of the redox current in the presence of 1 mM Fe(CN)6(3-/4-) in the electrolyte suggests the formation of some defects in the lipid structure of the film after the action of divalent cations. It is shown that the amount of these defects could be significantly decreased when the divalent cations are present in the electrolyte solution before the film formation. The effect of divalent cations on the film stability is tested by applying negative potential to the film. In 0.1 M KCl the films are not stable at potential of - 0.8 V (vs. Ag/AgCl) and are destroyed. The addition of divalent cations stabilizes the films and at certain millimolar concentrations the films remain intact after the action of the negative potential. The effect of Mn2+ is more pronounced, the Ca2+ and Mg2+ have smaller commensurate effect. It is proposed that the changes in the films' properties could be related with more tight packing of the lipid molecules with the divalent cations inserted in the film and that some defects could be opened during the rearrangement of the lipids when the film has been previously formed.
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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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Kew SJ, Hall EAH. Triggering blue–red transition response in polydiacetylene vesicles: an electrochemical surface plasmon resonance method. Analyst 2007; 132:801-10. [PMID: 17646880 DOI: 10.1039/b704921h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Electrochemical surface plasmon resonance (E-SPR) was used to investigate whether the chromic properties of a polydiacetylene (PDA) vesicle films, adsorbed onto an ultra-thin gold electrode, could be triggered by applied potential. This approach constitutes a preliminary model for a novel approach to the use of a triggered chromic transition, as an indicator of biorecognition headgroup binding in these materials. A PDA chromic blue-red transition was identified in E-SPR against the background Deltaepsilon(e) and Deltaepsilon(m). The latter resulted in a ca. 100 mDeg V(-1) shift in the SPR minimum, in the presence of PDA, with the PDA shielding changes in epsilon(e). Electrochemical charge transfer processes in the pre-oxide/oxide anodic region with adsorbed oxygen and hydroxide, involving a change in Au redox state (Au(0)/Au(+)) were visible in the SPR, due to a change in the gold layer thickness and gold oxide layer. However, the cathodic processes, not involving a change in the Au redox state or a increase/decrease in the surface layer dielectric, did not cause a change in the SPR. Based on this, dramatic changes in the optical properties of the adsorbed PDA film could be triggered at an applied cathodic potential, and were identified using SPR. These correlated with a pH-induced chromic transition. Both protonation and ion binding, linked with headgroup environment, were implicated in causing structural transitions in the adsorbed vesicle layer that may also be linked with their bulk optical properties.
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Affiliation(s)
- Simon J Kew
- Institute of Biotechnology, University of Cambridge, Tennis Court Road, UK CB2 1QT
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Ma Y, Wang J, Hui F, Zang S. The reassembled behavior of bilayer lipid membranes supported by Pt electrode. J Memb Sci 2006. [DOI: 10.1016/j.memsci.2006.09.036] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Zhang S, Cardona CM, Echegoyen L. Ion recognition properties of self-assembled monolayers (SAMs). Chem Commun (Camb) 2006:4461-73. [PMID: 17283788 DOI: 10.1039/b608146k] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the search for new sensors, self-assembled monolayers (SAMs) have gained intensive interest due to their nanometre size, highly-ordered structures, and molecular recognition properties. This article presents an overview of ion recognition at SAM-modified surface/solution interfaces, and brings up to date the most notable examples for the sensing of cations and anions. Sensing is achieved with SAMs containing redox active and inactive receptors using techniques such as fluorescence spectroscopy, cyclic voltammetry and electrochemical impedance spectroscopy.
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Affiliation(s)
- Sheng Zhang
- Department of Chemistry, Clemson University, Clemson, SC, USA
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Degefa TH, Schön P, Bongard D, Walder L. Elucidation of the electron transfer mechanism of marker ions at SAMs with charged head groups. J Electroanal Chem (Lausanne) 2004. [DOI: 10.1016/j.jelechem.2004.07.026] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Maeda K, Yoshida Y, Goto T, Mareček V. Blocking effect of a phospholipid monolayer on ion transfer at a liquid|liquid interface and its electrochemical control. J Electroanal Chem (Lausanne) 2004. [DOI: 10.1016/j.jelechem.2003.12.046] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Agak J, Stoodley R, Retter U, Bizzotto D. On the impedance of a lipid-modified Hg|electrolyte interface. J Electroanal Chem (Lausanne) 2004. [DOI: 10.1016/j.jelechem.2003.07.030] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Abstract
BLM prepared on electrode substrates by supporting or tethering were tested for 'pin-hole' character, comparing data from cyclic voltammetry (CV), surface plasmon resonance (SPR) and rotating disc electrodes (RDE). 1-hexadecylamine tethered BLMs on SAM modified gold electrodes were compared with BLMs assembled on modified polyHEMA or sol-gel layers. BLM formation followed by SPR showed that the initial phase of the assembly was complete in 5-20 minutes and produced layers of thickness >5 nm, compared with the expected final BLM thickness of approximately 3 nm. The CVs of the K(3)[Fe(CN)(6)] couple were significantly suppressed irrespective of the method of BLM assembly, without major differences emerging for the different methods. However, data from the RDE distinguished the 'pin-hole' character of the different preparations. The data were consistent with incomplete initial (<1 h, SPR estimated BLM thickness >5 nm) vesicle fusion leaving 'pin-holes' of approximately 2 microm (HDA-11-mercaptoundecanoic acid (MUA) tethered BLM) to approximately 3 microm (tetraethylorthosilicate sol-gel supported BLM) followed by a slow maturation (>15 h; impedance spectroscopy estimated thickness approximately 3 nm) and lateral spreading and fusion, resulting in loss of 'pin-hole' character (<1 microm). The BLM could be used in conjunction with potentiometric measurement to observe the incorporation of nystatin into the BLM and the rate of incorporation adjusted according to original permeability of the BLM. The 'pin-hole-free' BLM construction with lowest permeability (TEOS supported, 4 x 10(-10) cm s(-1) compared with HDA-MUA, 3 x 10(-9) cm s(-1)) gave a potentiometric signal independent of bulk ion-concentration across 5 decades change in concentration. Formed on an ion-selective electrode, nystatin incorporation could be followed as a change in potential, over >2 h, whereas the TEOS supported BLM with permeability 1 x 10(-9) cm s(-1) shows nystatin incorporation within 1 h. In this instance, addition of ConA reduced the potential to the same value as prior to nystatin incorporation, consistent with nystatin channel closure.
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Affiliation(s)
- Marian Rehak
- Institute of Biotechnology, University of Cambridge, Cambridge CB2 1QT, UK
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Yang F, Cui X, Yang X. Interaction of low-molecular-weight chitosan with mimic membrane studied by electrochemical methods and surface plasmon resonance. Biophys Chem 2002; 99:99-106. [PMID: 12223242 DOI: 10.1016/s0301-4622(02)00134-5] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Chitosan has shown its potential as a non-viral gene carrier and an adsorption enhancer for subsequent drug delivery to cells. These results showed that chitosan acted as a membrane perturbant. However, there is currently a lack of direct experimental evidence of this membrane perturbance effect, especially for chitosans with low molecular weight (LMW). In this report, the interaction between a lipid (didodecyl dimethylammonium bromide; DDAB) bilayer and chitosan with molecular weight (MW) of 4200 Da was studied with cyclic voltammetry (CV), electrochemical impedance spectroscopy and surface plasmon resonance (SPR). A lipid bilayer was formed by fusion of oppositely charged lipid vesicles on a mercaptopropionic acid (MPA)-modified gold surface to mimic a cell membrane. The results showed that the LMW chitosan could disrupt the lipid bilayer, and the effect seemed to be in a concentration-dependent manner.
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Affiliation(s)
- Fan Yang
- State Key Laboratory of Electroanalytical Chemistry and National Analytical Research Center of Electrochemistry and Spectroscopy, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Jilin 130022, Changchun, PR China
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