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Gutiérrez-Pineda E, Andreozzi P, Diamanti E, Anguiano R, Ziolo RF, Moya SE, José Rodríguez-Presa M, Gervasi CA. Effects of valinomycin doping on the electrical and structural properties of planar lipid bilayers supported on polyelectrolyte multilayers. Bioelectrochemistry 2020; 138:107688. [PMID: 33227594 DOI: 10.1016/j.bioelechem.2020.107688] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 10/16/2020] [Accepted: 10/20/2020] [Indexed: 11/29/2022]
Abstract
Supported Lipid Bilayers (SLBs) on Polyelectrolyte Multilayers (PEMs) have large potential as models for developing sensor devices. SLBs can be designed with receptors and channels, which benefit from the biological environment of the lipid layers, to create a sensing interface for ions and biomarkers. PEMs assembled by the Layer-by-Layer (LBL) technique and used as supports for a lipid bilayer enable an easy integration of the bilayer on almost any surface and device. For electrochemical sensors, LBL assembly enables nanoscale tunable separation of the lipid bilayer from the electrode surface, avoiding undesired effects of the electrode surface on the lipid bilayers. We study the fabrication of valinomycin-doped SLBs on PEMs as a model system for biophysical studies and for selective ion sensing. SLBs are fabricated from dioleoylphosphatidylcholine (DOPC) and dioleoylphosphatidylserine (DOPS) 50:50 vesicles doped with valinomycin, as a K+-selective carrier. SLBs were deposited on electrodes coated with poly(allyl amine hydrochloride) (PAH) and poly(styrene sodium sulfonate) (PSS) multilayers. Lipid bilayer formation was monitored by using Quartz Crystal Microbalance with Dissipation (QCMD) technique and Atomic Force Microscopy (AFM). Electrochemical impedance spectroscopy (EIS) and potentiometric measurements were performed to assess K+ selectivity over other ions and the potential of valinomycin-doped SLBs for K+-sensing.
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Affiliation(s)
- Eduart Gutiérrez-Pineda
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) Universidad Nacional de La Plata - CONICET Sucursal, 4 Casilla de Correo 16, 1900 La Plata, Argentina; Escuela de Ciencias Básicas, Tecnología e Ingeniería, Universidad Nacional Abierta y a Distancia (UNAD), Bucaramanga, Santander, 680001 Colombia.
| | - Patrizia Andreozzi
- Soft Matter Nanotechnology Group, CIC biomaGUNE, Paseo Miramón 182 C, 20009 San Sebastián, Spain
| | - Eleftheria Diamanti
- Soft Matter Nanotechnology Group, CIC biomaGUNE, Paseo Miramón 182 C, 20009 San Sebastián, Spain
| | - Ramiro Anguiano
- Departamento de Materiales Avanzados, Centro de Investigación en Química Aplicada (CIQA), Blvd., Enrique Reyna Hermosillo No.140, 25294 Saltillo, Mexico
| | - Ronald F Ziolo
- Departamento de Materiales Avanzados, Centro de Investigación en Química Aplicada (CIQA), Blvd., Enrique Reyna Hermosillo No.140, 25294 Saltillo, Mexico
| | - Sergio E Moya
- Soft Matter Nanotechnology Group, CIC biomaGUNE, Paseo Miramón 182 C, 20009 San Sebastián, Spain.
| | - María José Rodríguez-Presa
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) Universidad Nacional de La Plata - CONICET Sucursal, 4 Casilla de Correo 16, 1900 La Plata, Argentina
| | - Claudio A Gervasi
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) Universidad Nacional de La Plata - CONICET Sucursal, 4 Casilla de Correo 16, 1900 La Plata, Argentina; Área Electroquímica, Facultad de Ingeniería, Universidad Nacional de La Plata, calle 1 y 47, 1900 La Plata, Argentina.
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Corrales Chahar F, Díaz S, Ben Altabef A, Gervasi C, Alvarez P. Interactions of valproic acid with lipid membranes of 1,2-dimyristoyl-sn-glycero-3-phosphocholine. Chem Phys Lipids 2019; 218:125-135. [DOI: 10.1016/j.chemphyslip.2018.12.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 12/06/2018] [Accepted: 12/20/2018] [Indexed: 11/25/2022]
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Skalová Š, Vyskočil V, Barek J, Navrátil T. Model Biological Membranes and Possibilities of Application of Electrochemical Impedance Spectroscopy for their Characterization. ELECTROANAL 2017. [DOI: 10.1002/elan.201700649] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Štěpánka Skalová
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences; Dolejškova 3 182 23 Prague 8 Czech Republic
- Charles University; Faculty of Science, Department of Analytical Chemistry, UNESCO Laboratory of Environmental Electrochemistry; Hlavova 2030/8 128 43 Prague 2 Czech Republic
| | - Vlastimil Vyskočil
- Charles University; Faculty of Science, Department of Analytical Chemistry, UNESCO Laboratory of Environmental Electrochemistry; Hlavova 2030/8 128 43 Prague 2 Czech Republic
| | - Jiří Barek
- Charles University; Faculty of Science, Department of Analytical Chemistry, UNESCO Laboratory of Environmental Electrochemistry; Hlavova 2030/8 128 43 Prague 2 Czech Republic
| | - Tomáš Navrátil
- J. Heyrovský Institute of Physical Chemistry of the Czech Academy of Sciences; Dolejškova 3 182 23 Prague 8 Czech Republic
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Corrales Chahar F, Díaz SB, Ben Altabef A, Gervasi C, Alvarez PE. Characterization of interactions of eggPC lipid structures with different biomolecules. Chem Phys Lipids 2017; 210:60-69. [PMID: 29158127 DOI: 10.1016/j.chemphyslip.2017.11.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Revised: 11/15/2017] [Accepted: 11/15/2017] [Indexed: 10/18/2022]
Abstract
In this paper we study the interactions of two biomolecules (ascorbic acid and Annonacin) with a bilayer lipid membrane. Egg yolk phosphatidylcholine (eggPC) liposomes (in crystalline liquid state) were prepared in solutions of ascorbic acid (AA) at different concentration levels. On the other hand, liposomes were doped with Annonacin (Ann), a mono-tetrahydrofuran acetogenin (ACG), which is an effective citotoxic substance. While AA pharmacologic effect and action mechanisms are widely known, those of Ann's are only very recently being studied. Both Fourier Transformed Infrared (FTIR) and Raman spectroscopic techniques were used to study the participation of the main functional groups of the lipid bilayer involved in the membrane-solution interaction. The obtained spectra were comparatively analyzed, studying the spectral bands corresponding to both the hydrophobic and the hydrophilic regions in the lipid bilayer. Electrochemical experiments namely; impedance spectroscopy (EIS) and cyclic voltamperometry (CV) were used as the main characterization techniques to analyse stability and structural changes of a model system of supported EggPC bilayer in connection with its interactions with AA and Ann. At high molar ratios of AA, there is dehydration in both populations of the carbonyl group of the polar head of the lipid. On the other hand, Ann promotes the formation of hydrogen bonds with the carbonyl groups. No interaction between AA and phosphate groups is observed at low and intermediate molar ratios. Ann is expected to be able to induce the dehydration of the phosphate groups without the subsequent formation of H bonds with them. According to the electrochemical analysis, the interaction of AA with the supported lipid membrane does not alter its dielectric properties. This fact can be related to the conservation of structured water of the phosphate groups in the polar heads of the lipid. On the other hand, the incorporation of Ann into the lipid membrane generates an increase in the number of defects while changes the dielectric constant. This, in turn, can be associated with the induced dehydration of the phosphate groups.
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Affiliation(s)
- F Corrales Chahar
- Instituto de Física, Facultad de Bioquímica, Química y Farmacia, UNT, Ayacucho 471, 4000 Tucumán, Argentina
| | - S B Díaz
- Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, UNT, San Lorenzo 456, T4000CAN S. M. de Tucumán, Argentina
| | - A Ben Altabef
- Instituto de Química Física, Facultad de Bioquímica, Química y Farmacia, UNT, San Lorenzo 456, T4000CAN S. M. de Tucumán, Argentina; Instituto de Química del Noroeste Argentino (INQUINOA)-CONICET-Tucumán, Argentina.
| | - C Gervasi
- INIFTA-CONICET, Facultad de Ciencias Exactas, UNLP, Suc. 4-C.C. 16., 1900 La Plata, Argentina; Facultad de Ingeniería, UNLP, 1 y 47, 1900, La Plata, Argentina.
| | - P E Alvarez
- Instituto de Física, Facultad de Bioquímica, Química y Farmacia, UNT, Ayacucho 471, 4000 Tucumán, Argentina; Instituto de Química del Noroeste Argentino (INQUINOA)-CONICET-Tucumán, Argentina.
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