1
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Liu Z, Lin L, Li T, Premadasa UI, Hong K, Ma YZ, Sacci RL, Katsaras J, Carrillo JM, Doughty B, Collier CP. Physicochemical control of solvation and molecular assembly of charged amphiphilic oligomers at air-aqueous interfaces. J Colloid Interface Sci 2024; 669:552-560. [PMID: 38729003 DOI: 10.1016/j.jcis.2024.05.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 03/07/2024] [Accepted: 05/02/2024] [Indexed: 05/12/2024]
Abstract
HYPOTHESIS Understanding the rules that control the assembly of nanostructured soft materials at interfaces is central to many applications. We hypothesize that electrolytes can be used to alter the hydration shell of amphiphilic oligomers at the air-aqueous interface of Langmuir films, thereby providing a means to control the formation of emergent nanostructures. EXPERIMENTS Three representative salts - (NaF, NaCl, NaSCN) were studied for mediating the self-assembly of oligodimethylsiloxane methylimidazolium (ODMS-MIM+) amphiphiles in Langmuir films. The effects of the different salts on the nanostructure assembly of these films were probed using vibrational sum frequency generation (SFG) spectroscopy and Langmuir trough techniques. Experimental data were supported by atomistic molecular dynamic simulations. FINDINGS Langmuir trough surface pressure - area isotherms suggested a surprising effect on oligomer assembly, whereby the presence of anions affects the stability of the interfacial layer irrespective of their surface propensities. In contrast, SFG results implied a strong anion effect that parallels the surface activity of anions. These seemingly contradictory trends are explained by anion driven tail dehydration resulting in increasingly heterogeneous systems with entangled ODMS tails and appreciable anion penetration into the complex interfacial layer comprised of headgroups, tails, and interfacial water molecules. These findings provide physical and chemical insight for tuning a wide range of interfacial assemblies.
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Affiliation(s)
- Zening Liu
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
| | - Lu Lin
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
| | - Tianyu Li
- Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN 37996, United States
| | - Uvinduni I Premadasa
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
| | - Kunlun Hong
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
| | - Ying-Zhong Ma
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
| | - Robert L Sacci
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
| | - John Katsaras
- Neutron Scattering Division and Shull Wollan Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States; Shull Wollan Center, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States
| | - Jan-Michael Carrillo
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States.
| | - Benjamin Doughty
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States.
| | - C Patrick Collier
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States.
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2
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Li Y, Yoo S, Bu W, Zhang H, Dutta P. Modifying Specific Ion Effects: Studies of Monovalent Ion Interactions with Amines. J Phys Chem B 2024. [PMID: 38953612 DOI: 10.1021/acs.jpcb.4c02359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
Abstract
Specific ion effects in the interactions of monovalent anions with amine groups─one of the hydrophilic moieties found in proteins─were investigated using octadecylamine monolayers floating at air-aqueous solution interfaces. We find that at solution pH 5.7, larger monovalent anions induce a nonzero pressure starting at higher areas/molecules, i.e., a wider "liquid expanded" region in the monolayer isotherms. Using X-ray fluorescence at near total reflection (XFNTR), an element- and surface-specific technique, ion adsorption to the amines at pH 5.7 is confirmed to be ion-specific and to follow the conventional Hofmeister series. However, at pH 4, this ion specificity is no longer observed. We propose that at the higher pH, the amine headgroups are only partially protonated, and large polarizable ions such as iodine are better able to boost amine protonation. At the lower pH, on the other hand, the monolayer is fully protonated, and electrostatic interactions dominate over ion specificity. These results demonstrate that ion specificity can be modified by changing the experimental conditions.
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Affiliation(s)
- Yanlin Li
- Department of Physics & Astronomy, Northwestern University, Evanston, Illinois 60208, United States
| | - Sangjun Yoo
- Department of Physics & Astronomy, Northwestern University, Evanston, Illinois 60208, United States
| | - Wei Bu
- NSF's ChemMatCARS, University of Chicago, Chicago, Illinois 60637, United States
| | - Honghu Zhang
- NSLS-II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Pulak Dutta
- Department of Physics & Astronomy, Northwestern University, Evanston, Illinois 60208, United States
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3
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Dynarowicz-Latka P, Wnętrzak A, Chachaj-Brekiesz A. Advantages of the classical thermodynamic analysis of single-and multi-component Langmuir monolayers from molecules of biomedical importance-theory and applications. J R Soc Interface 2024; 21:20230559. [PMID: 38196377 PMCID: PMC10777166 DOI: 10.1098/rsif.2023.0559] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Accepted: 12/08/2023] [Indexed: 01/11/2024] Open
Abstract
The Langmuir monolayer technique has been successfully used for decades to model biological membranes and processes occurring at their interfaces. Classically, this method involves surface pressure measurements to study interactions within membrane components as well as between external bioactive molecules (e.g. drugs) and the membrane. In recent years, surface-sensitive techniques were developed to investigate monolayers in situ; however, the obtained results are in many cases insufficient for a full characterization of biomolecule-membrane interactions. As result, description of systems using parameters such as mixing or excess thermodynamic functions is still relevant, valuable and irreplaceable in biophysical research. This review article summarizes the theory of thermodynamics of single- and multi-component Langmuir monolayers. In addition, recent applications of this approach to characterize surface behaviour and interactions (e.g. orientation of bipolar molecules, drug-membrane affinity, lateral membrane heterogeneity) are presented.
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Affiliation(s)
| | - Anita Wnętrzak
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland
| | - Anna Chachaj-Brekiesz
- Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, 30-387 Kraków, Poland
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4
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Sun J, Kleuskens S, Luan J, Wang D, Zhang S, Li W, Uysal G, Wilson DA. Morphogenesis of starfish polymersomes. Nat Commun 2023; 14:3612. [PMID: 37330564 PMCID: PMC10276845 DOI: 10.1038/s41467-023-39305-8] [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: 09/17/2021] [Accepted: 06/06/2023] [Indexed: 06/19/2023] Open
Abstract
The enhanced membrane stability and chemical versatility of polymeric vesicles have made them promising tools in micro/nanoreactors, drug delivery, cell mimicking, etc. However, shape control over polymersomes remains a challenge and has restricted their full potential. Here we show that local curvature formation on the polymeric membrane can be controlled by applying poly(N-isopropylacrylamide) as a responsive hydrophobic unit, while adding salt ions to modulate the properties of poly(N-isopropylacrylamide) and its interaction with the polymeric membrane. Polymersomes with multiple arms are fabricated, and the number of arms could be tuned by salt concentration. Furthermore, the salt ions are shown to have a thermodynamic effect on the insertion of poly(N-isopropylacrylamide) into the polymeric membrane. This controlled shape transformation can provide evidence for studying the role of salt ions in curvature formation on polymeric membranes and biomembranes. Moreover, potential stimuli-responsive non-spherical polymersomes can be good candidates for various applications, especially in nanomedicine.
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Affiliation(s)
- Jiawei Sun
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands
| | - Sandra Kleuskens
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands
| | - Jiabin Luan
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands
| | - Danni Wang
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands
| | - Shaohua Zhang
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands
| | - Wei Li
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands
| | - Gizem Uysal
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands
| | - Daniela A Wilson
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, the Netherlands.
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5
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Peychev B, Arabadzhieva D, Minkov I, Mileva E, Smoukov SK, Slavchov RI. Measuring the Adsorption of Electrolytes on Lipid Monolayers. J Phys Chem Lett 2023; 14:4652-4656. [PMID: 37167099 DOI: 10.1021/acs.jpclett.3c00795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The interactions between ions and lipid monolayers have captivated the attention of biologists and chemists alike for almost a century. In the absence of experimentally accessible concentration profiles, the electrolyte adsorption remains the most informative quantitative characteristic of the ion-lipid interactions. However, there is no established procedure to obtain the electrolyte adsorption on spread lipid monolayers. As a result, in the literature, the ion-lipid monolayer interactions are discussed qualitatively, based on the electrolyte effect on more easily accessible variables, e.g., surface tension. In this letter, we demonstrate how the electrolyte adsorption on lipid monolayers can be obtained experimentally. The procedure requires combining surface pressure versus molecular area compression isotherms with spreading pressure data. For the first time, we report an adsorption isotherm of NaCl on a lipid monolayer as a function of the density of the monolayer. The leading interactions seem to be the osmotic effect from the lipid head groups in the surface layer and ion-lipid association.
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Affiliation(s)
- Boyan Peychev
- Queen Mary University of London, School of Engineering and Materials Science, Mile End Road, London E1 4NS, United Kingdom
| | - Dimitrinka Arabadzhieva
- Rostislaw Kaischew Institute of Physical Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 11, 1113 Sofia, Bulgaria
| | - Ivan Minkov
- Rostislaw Kaischew Institute of Physical Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 11, 1113 Sofia, Bulgaria
- Department of Chemistry, Biochemistry, Physiology, and Pathophysiology, Faculty of Medicine, Sofia University, 1 Koziak Str., 1407 Sofia, Bulgaria
| | - Elena Mileva
- Rostislaw Kaischew Institute of Physical Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 11, 1113 Sofia, Bulgaria
| | - Stoyan K Smoukov
- Queen Mary University of London, School of Engineering and Materials Science, Mile End Road, London E1 4NS, United Kingdom
| | - Radomir I Slavchov
- Queen Mary University of London, School of Engineering and Materials Science, Mile End Road, London E1 4NS, United Kingdom
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6
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Peychev B, Slavchov RI. Interactions between Small Inorganic Ions and Uncharged Monolayers on the Water/Air Interface. J Phys Chem B 2023; 127:2801-2817. [PMID: 36930736 PMCID: PMC10068745 DOI: 10.1021/acs.jpcb.2c08019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
Abstract
The interaction of several simple electrolytes with uncharged insoluble monolayers is studied on the basis of tensiometric and potentiometric data for the surface electrolyte solution|air. The induced adsorption of electrolyte on the monolayer is determined via a combination of data for equilibrium spreading pressure and surface pressure versus area isotherms. We show that the monolayer-induced adsorption of electrolyte is not only strongly ion-specific but also surfactant-specific. The comparison between the ion-specific effects on a carboxylic acid monolayer at low pH and an ester monolayer shows that the anion series follows the same order while the cation series reverses. The effect of the electrolyte on the chemical potential of the monolayer shows attraction between the surfactant and the ions at low monolayer densities, but at high surface densities, repulsion seems to come into play. In nearly all investigated cases, a maximum of monolayer-induced electrolyte adsorption is observed at intermediate monolayer densities. This suggests specific interactions between the surfactant headgroup and the ions. The Volta potential data for the monolayers are analyzed on the basis of the equations of quadrupolar electrostatics. The analysis suggests that the ion-specific effect on the Volta potential is due to the ion-specific decrement of the bulk dielectric constant of the electrolyte solution. Moreover, we present evidence that in most cases the effect of the electrolyte on the orientation of the adsorbed dipoles cannot be neglected. Instead, the change in the ion distribution in the electric double layer seems to have a small effect on the Volta potential.
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Affiliation(s)
- Boyan Peychev
- Queen Mary University of London, School of Engineering and Materials Science, Mile End Road, London E1 4NS, United Kingdom
| | - Radomir I Slavchov
- Queen Mary University of London, School of Engineering and Materials Science, Mile End Road, London E1 4NS, United Kingdom
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7
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Xie B, Yang S. Effect of Fluoxetine on the Surface Behavior of the Lipid Monolayers at Different Surface Pressures. J Membr Biol 2023; 256:43-50. [PMID: 35907027 DOI: 10.1007/s00232-022-00249-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 05/25/2022] [Indexed: 02/07/2023]
Abstract
Fluoxetine (FLX), used in the clinic to treat depression, is a well-known cationic amphiphilic antidepressant. However, there is a lack of research on the effect of FLX on the surface behavior of lipid monolayers under different surface pressures. In this study, 1,2-dipalmitoyl-sn-glycero-3-phosphocholine/1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine/CHOL (DPPC/POPC/CHOL) monolayers were prepared via the Langmuir method, and FLX was added to these monolayers under various surface pressures. The effect of FLX on the surface behavior of DPPC/POPC/CHOL monolayers under various surface pressures was studied using a combination of surface pressure-area isotherms, compressibility modulus-surface pressure curves, and atomic force microscope (AFM). The results showed that the effect of FLX on the lipid monolayers was different under different surface pressures. The interaction between FLX and lipid molecules was weak under low surface pressures, and FLX could easily intercalate between the lipid molecules to inhibit monolayer phase transition. The interaction between FLX and lipid molecules was enhanced and FLX tended to self-aggregate to reduce the monolayer stability when the surface pressure was high. This study lays the foundation for further studies on the interaction between FLX and lipid monolayers.
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Affiliation(s)
- Bin Xie
- School of Physics and Electrical Engineering, Kashi University, Kashi, 844009, People's Republic of China.
| | - Shumin Yang
- School of Physics and Electrical Engineering, Kashi University, Kashi, 844009, People's Republic of China
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8
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Klačić T, Bohinc K, Kovačević D. Suppressing the Hofmeister Anion Effect by Thermal Annealing of Thin-Film Multilayers Made of Weak Polyelectrolytes. Macromolecules 2022; 55:9571-9582. [PMID: 36397937 PMCID: PMC9661731 DOI: 10.1021/acs.macromol.2c01517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 09/16/2022] [Indexed: 11/30/2022]
Abstract
![]()
Thin films made of
weak polyelectrolytes poly(allylamine hydrochloride)
(PAH) and poly(acrylic acid) (PAA) have been fabricated on silicon
wafers using the layer-by-layer (LbL) method. To study the influence
of counteranion type on the growth and properties of PAH/PAA multilayers,
the nature of the supporting sodium salt was varied from cosmotropic
to chaotropic anions (F–, Cl–,
and ClO4–). Results of ellipsometry and
AFM measurements indicate that the film thickness and surface roughness
systematically increase on the order F– < Cl– < ClO4–. Furthermore,
we found that the hydrophobicity of the PAH/PAA multilayer also follows
the described trend when a polycation is the terminating layer. However,
the heating of PAH/PAA multilayers to 60 °C during the LbL assembly
suppressed the influence of background anions on the multilayer formation
and properties. On the basis of the obtained results, it could be
concluded that thermal annealing induces changes at the polymer–air
interface in the sense of reorientation and migration of polymer chains.
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Affiliation(s)
- Tin Klačić
- Division of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia
| | - Klemen Bohinc
- Faculty of Health Sciences, University of Ljubljana, Zdravstvena pot 5, 1000 Ljubljana, Slovenia
| | - Davor Kovačević
- Division of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia
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9
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McCourt J, Kewalramani S, Gao C, Roth EW, Weigand SJ, Olvera de la Cruz M, Bedzyk MJ. Electrostatic Control of Shape Selection and Nanoscale Structure in Chiral Molecular Assemblies. ACS CENTRAL SCIENCE 2022; 8:1169-1181. [PMID: 36032772 PMCID: PMC9413830 DOI: 10.1021/acscentsci.2c00447] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Indexed: 06/01/2023]
Abstract
How molecular chirality manifests at the nano- to macroscale has been a scientific puzzle since Louis Pasteur discovered biochirality. Chiral molecules assemble into meso-shapes such as twisted and helical ribbons, helicoidal scrolls (cochleates), or möbius strips (closed twisted ribbons). Here we analyze self-assembly for a series of amphiphiles, C n -K, consisting of an ionizable amino acid [lysine (K)] coupled to alkyl tails with n = 12, 14, or 16 carbons. This simple system allows us to probe the effects of electrostatic and van der Waals interactions in chiral assemblies. Small/wide-angle X-ray scattering (SAXS/WAXS) reveals that at low pH, where the headgroups are ionized (+1), C16-K forms high aspect ratio, planar crystalline bilayers. Molecular dynamics (MD) simulations reveal that tilted tails of the bilayer leaflets are interdigitated. SAXS shows that, with increasing salt concentration, C16-K molecules assemble into cochleates, whereas at elevated pH (reduced degree of ionization), helices are observed for all C n -K assemblies. The shape selection between helices and scrolls is explained by a membrane energetics model. The nano- to meso-scale structure of the chiral assemblies can be continuously controlled by solution ionic conditions. Overall, our study represents a step toward an electrostatics-based approach for shape selection and nanoscale structure control in chiral assemblies.
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Affiliation(s)
- Joseph
M. McCourt
- Department
of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, United States
| | - Sumit Kewalramani
- Department
of Materials Science and Engineering, Northwestern
University, Evanston, Illinois 60208, United States
| | - Changrui Gao
- Department
of Materials Science and Engineering, Northwestern
University, Evanston, Illinois 60208, United States
| | - Eric W. Roth
- Department
of Materials Science and Engineering, Northwestern
University, Evanston, Illinois 60208, United States
| | - Steven J. Weigand
- DuPont-Northwestern-Dow
Collaborative Access Team, Northwestern
University Synchrotron Research Center, Advanced Photon Source, Argonne, Illinois 60439, United States
| | - Monica Olvera de la Cruz
- Department
of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, United States
- Department
of Materials Science and Engineering, Northwestern
University, Evanston, Illinois 60208, United States
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Michael J. Bedzyk
- Department
of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, United States
- Department
of Materials Science and Engineering, Northwestern
University, Evanston, Illinois 60208, United States
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10
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Sthoer A, Adams EM, Sengupta S, Corkery RW, Allen HC, Tyrode EC. La 3+ and Y 3+ interactions with the carboxylic acid moiety at the liquid/vapor interface: Identification of binding complexes, charge reversal, and detection limits. J Colloid Interface Sci 2022; 608:2169-2180. [PMID: 34798383 DOI: 10.1016/j.jcis.2021.10.052] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Revised: 09/30/2021] [Accepted: 10/11/2021] [Indexed: 10/20/2022]
Abstract
Specific interactions of yttrium and lanthanum ions with a fatty acid Langmuir monolayer were investigated using vibrational sum frequency spectroscopy. The trivalent ions were shown to interact with the charged form of the carboxylic acid group from nanomolar concentrations (<300 nM). Analysis of the spectral features from both the symmetric and the asymmetric carboxylate modes reveals the presence of at least three distinct coordination structures linked to specific binding configurations. Although the same species were identified for both La3+ and Y3+, they display a different concentration dependence, highlighting the ion-specificity of the interaction. From the analysis of the response of interfacial water molecules, the reversal of the surface charge, as well as the formation of yttrium hydroxide complexes, were detected upon increasing the amount of salt in solution. The binding interaction and kinetics of absorption are sensitive to the solution pH, showing a distinct ion speciation in the interfacial region when compared to the bulk. Changing the subphase pH or adding a monovalent background electrolyte that promotes deprotonation of the carboxylic acid headgroup could further improve the detection limit of La3+ and Y3+ to concentrations < 100 nM. These findings demonstrate that nM concentrations of trace metals contaminants, typically found on monovalent salts, can significantly influence the binding structure and kinetics in Langmuir monolayers.
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Affiliation(s)
- Adrien Sthoer
- Department of Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden
| | - Ellen M Adams
- Department of Chemistry & Biochemistry, The Ohio State University, Columbus, OH 43210, USA; Department of Physical Chemistry II, Ruhr-Universität Bochum, 44801 Bochum, Germany(1)
| | - Sanghamitra Sengupta
- Department of Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden; Ultrafast Spectroscopy, AMOLF, 1098 XG Science Park, Amsterdam, The Netherlands(1)
| | - Robert W Corkery
- Department of Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden; Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University, Canberra, ACT0200, Australia
| | - Heather C Allen
- Department of Chemistry & Biochemistry, The Ohio State University, Columbus, OH 43210, USA
| | - Eric C Tyrode
- Department of Chemistry, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden.
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11
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Alvares DS, Crosio M, Wilke N. Hopanoid Hopene Locates in the Interior of Membranes and Affects Their Properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:11900-11908. [PMID: 34585578 DOI: 10.1021/acs.langmuir.1c02030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Hopanoids are proposed as sterol surrogates in some bacteria, and it has been proved that some hopanoids are able to induce a liquid-order phase state in lipid membranes. The members of this group of molecules have diverse structures, and not all of them have been studied in detail yet. Here, we study membranes with the hopanoid hopene (hop-22 (29)-ene or diploptene), which is the product of the cycling of squalene by squalene-hopene cyclase, and thus is present in the first step of hopanoid biosynthesis. Hopene is particularly interesting because it lacks a polar head group, which opens the question of how does this molecule accommodate in a lipid membrane, and what are the effects promoted by its presence. In order to get an insight into this, we prepared monolayers and bilayers of a phospholipid with hopene and studied their properties in comparison with pure phospholipid membranes, and with the sterol cholesterol or the hopanoid diplopterol. Film stiffness, shear viscosity, and bending dynamics were very affected by the presence of hopene, while zeta-potential, generalized polarization of Laurdan, and conductivity were affected moderately by this molecule. The results suggest that at very low percentages, hopene locates parallel to the phospholipid molecules, while the excess of the hopene molecules stays between leaflets, as previously proposed using molecular dynamics simulations.
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Affiliation(s)
- Dayane S Alvares
- Department of Physics, UNESP-São Paulo State University, IBILCE, São José do Rio Preto, 15054-000 São Paulo, Brazil
- Facultad de Ciencias Químicas, Departamento de Química Biológica Ranwel Caputto, Universidad Nacional de Córdoba, X5000HUA Córdoba, Argentina
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), CONICET, Universidad Nacional de Córdoba, X5000HUA Córdoba, Argentina
| | - Matias Crosio
- Facultad de Ciencias Químicas, Departamento de Química Biológica Ranwel Caputto, Universidad Nacional de Córdoba, X5000HUA Córdoba, Argentina
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), CONICET, Universidad Nacional de Córdoba, X5000HUA Córdoba, Argentina
| | - Natalia Wilke
- Facultad de Ciencias Químicas, Departamento de Química Biológica Ranwel Caputto, Universidad Nacional de Córdoba, X5000HUA Córdoba, Argentina
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), CONICET, Universidad Nacional de Córdoba, X5000HUA Córdoba, Argentina
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12
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Van Cleave C, Koehn JT, Pereira CS, Haase AA, Peters BJ, Croslow SW, McLaughlin KG, Werst KR, Goach AL, Crick DC, Arantes GM, Crans DC. Interactions of Truncated Menaquinones in Lipid Monolayers and Bilayers. Int J Mol Sci 2021; 22:9755. [PMID: 34575937 PMCID: PMC8470443 DOI: 10.3390/ijms22189755] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 09/02/2021] [Accepted: 09/05/2021] [Indexed: 11/28/2022] Open
Abstract
Menaquinones (MK) are hydrophobic molecules that consist of a naphthoquinone headgroup and a repeating isoprenyl side chain and are cofactors used in bacterial electron transport systems to generate cellular energy. We have previously demonstrated that the folded conformation of truncated MK homologues, MK-1 and MK-2, in both solution and reverse micelle microemulsions depended on environment. There is little information on how MKs associate with phospholipids in a model membrane system and how MKs affect phospholipid organization. In this manuscript, we used a combination of Langmuir monolayer studies and molecular dynamics (MD) simulations to probe these questions on truncated MK homologues, MK-1 through MK-4 within a model membrane. We observed that truncated MKs reside farther away from the interfacial water than ubiquinones are are located closer to the phospholipid tails. We also observed that phospholipid packing does not change at physiological pressure in the presence of truncated MKs, though a difference in phospholipid packing has been observed in the presence of ubiquinones. We found through MD simulations that for truncated MKs, the folded conformation varied, but MKs location and association with the bilayer remained unchanged at physiological conditions regardless of side chain length. Combined, this manuscript provides fundamental information, both experimental and computational, on the location, association, and conformation of truncated MK homologues in model membrane environments relevant to bacterial energy production.
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Affiliation(s)
- Cameron Van Cleave
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA; (C.V.C.); (J.T.K.); (A.A.H.); (B.J.P.); (K.R.W.)
| | - Jordan T. Koehn
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA; (C.V.C.); (J.T.K.); (A.A.H.); (B.J.P.); (K.R.W.)
| | - Caroline Simões Pereira
- Department of Biochemistry, Institutio de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, São Paulo 05508-900, SP, Brazil; (C.S.P.); (G.M.A.)
| | - Allison A. Haase
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA; (C.V.C.); (J.T.K.); (A.A.H.); (B.J.P.); (K.R.W.)
| | - Benjamin J. Peters
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA; (C.V.C.); (J.T.K.); (A.A.H.); (B.J.P.); (K.R.W.)
| | - Seth W. Croslow
- Department of Chemistry, Monmouth College, Monmouth, IL 61462, USA; (S.W.C.); (K.G.M.); (A.L.G.)
| | - Kyle G. McLaughlin
- Department of Chemistry, Monmouth College, Monmouth, IL 61462, USA; (S.W.C.); (K.G.M.); (A.L.G.)
| | - Katarina R. Werst
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA; (C.V.C.); (J.T.K.); (A.A.H.); (B.J.P.); (K.R.W.)
| | - Audra L. Goach
- Department of Chemistry, Monmouth College, Monmouth, IL 61462, USA; (S.W.C.); (K.G.M.); (A.L.G.)
| | - Dean C. Crick
- Cell and Molecular Biology Program, Colorado State University, Fort Collins, CO 80523, USA;
- Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO 80523, USA
| | - Guilherme Menegon Arantes
- Department of Biochemistry, Institutio de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, São Paulo 05508-900, SP, Brazil; (C.S.P.); (G.M.A.)
| | - Debbie C. Crans
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA; (C.V.C.); (J.T.K.); (A.A.H.); (B.J.P.); (K.R.W.)
- Cell and Molecular Biology Program, Colorado State University, Fort Collins, CO 80523, USA;
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13
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Sowah‐Kuma D, Rehman J, Yeboah A, Bu W, Yan C, Paige MF. Iron Binding in an Ethylenediaminetetracetic Acid‐Based Gemini Surfactant Monolayer Film. J SURFACTANTS DETERG 2021. [DOI: 10.1002/jsde.12498] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- David Sowah‐Kuma
- Department of Chemistry University of Saskatchewan Saskatoon Saskatchewan S7N 5C9 Canada
| | - Jeveria Rehman
- Department of Chemistry University of Saskatchewan Saskatoon Saskatchewan S7N 5C9 Canada
| | - Alfred Yeboah
- Department of Chemistry University of Saskatchewan Saskatoon Saskatchewan S7N 5C9 Canada
| | - Wei Bu
- NSF's ChemMatCARS The University of Chicago Chicago IL 60637 USA
| | - Ci Yan
- Department of Chemistry University of Saskatchewan Saskatoon Saskatchewan S7N 5C9 Canada
| | - Matthew F. Paige
- Department of Chemistry University of Saskatchewan Saskatoon Saskatchewan S7N 5C9 Canada
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14
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Cano M, Giner-Casares JJ. Biomineralization at fluid interfaces. Adv Colloid Interface Sci 2020; 286:102313. [PMID: 33181402 DOI: 10.1016/j.cis.2020.102313] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 10/30/2020] [Accepted: 10/30/2020] [Indexed: 12/16/2022]
Abstract
Biomineralization is of paramount importance for life on Earth. The delicate balance of physicochemical interactions at the interface between organic and inorganic matter during all stages of biomineralization resembles an extremely high complexity. The coordination of this sophisticated biological machinery and physicochemical scenarios is certainly a wonderful show of nature. Understanding of the biomineralization processes is still far from complete. The recent advances in biomineralization research from the Colloid and Interface Science perspective are reviewed herein. The synergy between this two fields of research is demonstrated. The unique opportunities offered by purposefully designed fluid interfaces, mainly Langmuir monolayers are presented. Biomedical applications of biomineral-based nanostructures are discussed, showing their improved biocompatibility and on-demand delivery features. A brief guide to the array of state-of-the-art experimental techniques for unraveling the mechanisms of biomineralization using fluid interfaces is included. In summary, the fruitful and exciting crossroad between Colloid and Interface Science with Biomineralization is exhibited.
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15
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Real-time monitoring of the effect of carbon nanoparticles on the surface behavior of DPPC/DPPG Langmuir monolayer. Colloids Surf B Biointerfaces 2020; 190:110922. [DOI: 10.1016/j.colsurfb.2020.110922] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 02/20/2020] [Accepted: 02/29/2020] [Indexed: 11/20/2022]
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16
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Rofeh J, Theogarajan L. Instantaneous tension measurements in droplet interface bilayers using an inexpensive, integrated pendant drop camera. SOFT MATTER 2020; 16:4484-4493. [PMID: 32337523 DOI: 10.1039/d0sm00418a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Recently, droplet interface bilayers (DIBs) have been used to determine bilayer tension and thickness in situ by automated image analysis using a microscope and an applied voltage. In this paper, we demonstrate improvements to these measurements by integrating an inexpensive pendant drop setup onto the microscope stage, which allows for simultaneous imaging of DIBs from both the bottom and side. By using pendant drop shape analysis in situ to determine the monolayer tension of the droplets, we avoid the reliance on applied voltages to determine tension. The integrated system also allows for direct measurement of both the major and minor diameter of the elliptical contact region, which produces a more direct measurement of the bilayer specific capacitance. Additionally, we demonstrate a technique for measuring the instantaneous monolayer tension of DIBs using shape analysis despite the assumed requirement for axial symmetry in pendant drop tensiometry. Compared to previous DIB measurements, the integrated pendant drop-microscope system provides improved accuracy accompanied by a fivefold to twentyfold improvement in precision while considerably decreasing the experiment time.
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Affiliation(s)
- Justin Rofeh
- Department of Physics, University of California, Santa Barbara, California 93106, USA
| | - Luke Theogarajan
- Department of Electrical and Computer Engineering, University of California, Santa Barbara, California 93106, USA.
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17
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Kang B, Tang H, Zhao Z, Song S. Hofmeister Series: Insights of Ion Specificity from Amphiphilic Assembly and Interface Property. ACS OMEGA 2020; 5:6229-6239. [PMID: 32258857 PMCID: PMC7114165 DOI: 10.1021/acsomega.0c00237] [Citation(s) in RCA: 117] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2020] [Accepted: 03/13/2020] [Indexed: 05/04/2023]
Abstract
Hofmeister series (HS), ion specific effect, or lyotropic sequence acts as a pivotal part in a number of biological and physicochemical phenomena, e.g., changing the solubility of hydrophobic solutes, the cloud points of polymers and nonionic surfactants, the activities of various enzymes, the action of ions on an ion-channel, and the surface tension of electrolyte solutions, etc. This review focused on how ion specificity influences the critical micelle concentration (CMC) and how the thermoresponsive behavior of surfactants, and the dynamic transition of the aggregate, controls the aggregate transition and gel formation and tunes the properties of air/water interfaces (Langmuir monolayer and interfacial free energy). Recent progress of the ion specific effect in bulk phase and at interfaces in amphiphilic systems and gels is summarized. Applications and a molecular level theoretical explanation of HS are discussed comprehensively. This review is aimed to supply a fresh and comprehensive understanding of Hofmiester phenomena in surfactants, polymers, colloids, and interface science and to provide a guideline to design the microstructures and templates for preparation of nanomaterials.
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Affiliation(s)
- Beibei Kang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Huicheng Tang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Zengdian Zhao
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, P. R. China
| | - Shasha Song
- School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, P. R. China
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18
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Bakshi K, Mitra S, Sharma VK, Jayadev MSK, Sakai VG, Mukhopadhyay R, Gupta A, Ghosh SK. Imidazolium-based ionic liquids cause mammalian cell death due to modulated structures and dynamics of cellular membrane. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2020; 1862:183103. [DOI: 10.1016/j.bbamem.2019.183103] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 09/25/2019] [Accepted: 10/10/2019] [Indexed: 12/20/2022]
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19
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Effect of Escherichia coli on phospholipid monolayers: surface tensiometry and Brewster angle microscopy measurements. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2019; 49:71-84. [PMID: 31863194 DOI: 10.1007/s00249-019-01413-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 07/07/2019] [Accepted: 12/06/2019] [Indexed: 10/25/2022]
Abstract
The effect of Escherichia coli (E. coli) cells on two phospholipids [dipalmitoyl phosphatidylcholine (DPPC) and dimyristoyl phosphatidylcholine (DMPC)] monolayers at the surface of a 1.5 wt% NaCl salt solution has been investigated using surface tension measurement and Brewster angle microscopy. The results showed that a DPPC monolayer that has an elastic structure was changed in morphology by interaction with E. coli cells, whereas a DMPC monolayer that has an expandable structure did not change in morphology. In particular, the morphology changed significantly around the liquid-expanded (LE)-liquid-condensed (LC) phase transition point for the DPPC monolayer. It was found that the LE-LC phase transition range in a DPPC monolayer was sensitive to influence from the outside of the monolayer such as the action of E. coli cells. Such a monolayer has the potential for application as a membrane sensor for detecting a small amount of bacteria in a short time.
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20
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Bilotto P, Lengauer M, Andersson J, Ramach U, Mears LLE, Valtiner M. Interaction Profiles and Stability of Rigid and Polymer-Tethered Lipid Bilayer Models at Highly Charged and Highly Adhesive Contacts. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:15552-15563. [PMID: 31475831 DOI: 10.1021/acs.langmuir.9b01942] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Understanding interaction force versus distance profiles of supported lipid bilayers (SLBs) is relevant to a number of areas, which rely on these model systems, including, e.g., characterization of ligand/receptor interactions or bacterial adhesion. Here, the stability of 4 different SLB architectures was compared using the surface forces apparatus (SFA) and atomic force microscopy (AFM). Specifically, the outer envelope of the bilayer systems remained constant as 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC). The inner layer was varied between DPPC and 1,2-dipalmitoyl-3-trimethylammonium-propane (DPTAP) both on mica, and self-assembled monolayers (SAMs) of hexadecanethiol and the polymer-tethered diphytanylglycerol-tetraethylene glycol-lipoid acid (DPhyTL) on smooth gold surfaces. In that same order these gave an increasing strength of interaction between the inner layer and the supporting substrate and hence improved stability under highly adhesive conditions. Detachment profiles from highly charged and highly adhesive contacts were characterized, and approach characteristics were fitted to DLVO models. We find increasing stability under highly adhesive loads, approaching the hydrophobic limit of the adhesive energy between the inner and outer layers for the SAM-based systems. For all four SLBs we further compare AFM surface topographies, which strongly depend on preparation conditions, and the DLVO fitting of the SFA approach curves finds a strong charge regulation behavior during interaction, dependent on the particular model system. In addition, we find undulation characteristics during approach and separation. The increased stability of the complex architectures on a gold support makes these model systems an ideal starting point for studying more complex strongly adhesive/interacting systems, including, for example, ligand/receptor interactions, biosensing interactions, or cell/surface interactions.
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Affiliation(s)
- Pierluigi Bilotto
- Institute of Applied Physics , Vienna University of Technology , Vienna 1040 , Austria
| | - Maximilian Lengauer
- Institute of Applied Physics , Vienna University of Technology , Vienna 1040 , Austria
| | | | - Ulrich Ramach
- Institute of Applied Physics , Vienna University of Technology , Vienna 1040 , Austria
- CEST Kompetenzzentrum für elektrochemische Oberflächentechnologie , Wiener Neustadt 2700 , Austria
| | - Laura L E Mears
- Institute of Applied Physics , Vienna University of Technology , Vienna 1040 , Austria
| | - Markus Valtiner
- Institute of Applied Physics , Vienna University of Technology , Vienna 1040 , Austria
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21
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Study of mucin interaction with model phospholipid membrane at the air–water interface. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.123587] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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22
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Varade SR, Ghosh P. Foaming in aqueous solutions of zwitterionic surfactant in presence of monovalent salts: The specific ion effect. CHEM ENG COMMUN 2019. [DOI: 10.1080/00986445.2019.1647178] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Shailesh R. Varade
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India
| | - Pallab Ghosh
- Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India
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23
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Elastic compliance as a tool to understand Hofmeister ion specific effect in DMPC liposomes. Biophys Chem 2019; 249:106148. [PMID: 30981138 DOI: 10.1016/j.bpc.2019.106148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 04/02/2019] [Accepted: 04/04/2019] [Indexed: 11/21/2022]
Abstract
Elastic compliance of DMPC liposomes with Hofmeister electrolytes: NaCl, Na2SO4, Na2CO3, NaNO3, KCl and MgCl2 studied using Quartz crystal microbalance with dissipation has been correlated with changes in their lamellar spacing from SAXS. The study suggests that hydration water of the different ions has an effect on the overall packing of the lipid bilayer that results as either a dehydrated liposome or where water smears the surface of the liposomes. Ratio of hydrogen bonded carbonyl and phosphate of polar region of the liposomes from ATR-FTIR spectroscopy, suggests that the polar groups are less hydrated due to the displacement of water by the electrolytes compared to pure DMPC and ordered in the sequence for cations as: K+ < Na+,Mg2+ and for anions as SO42- < CO32- < Cl- < NO3-. These findings show the usefulness of Elastic compliance for structural studies of composite phospholipid bilayers, lipid-protein complexes and lipid systems of reduced dimensionalities.
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24
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Argudo PG, Contreras-Montoya R, Álvarez de Cienfuegos L, Martín-Romero MT, Camacho L, Giner-Casares JJ. Optimization of Amino Acid Sequence of Fmoc-Dipeptides for Interaction with Lipid Membranes. J Phys Chem B 2019; 123:3721-3730. [DOI: 10.1021/acs.jpcb.9b01132] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Pablo G. Argudo
- Departamento de Química Física y T. Aplicada, Instituto Universitario de Investigación en Química Fina y Nanoquímica IUIQFN, Facultad de Ciencias, Universidad de Córdoba (UCO), Campus de Rabanales, Ed. Marie Curie, E-14071 Córdoba, Spain
| | - Rafael Contreras-Montoya
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Granada (UGR), C. U. Fuentenueva, Granada E-18071, Spain
| | - Luis Álvarez de Cienfuegos
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Granada (UGR), C. U. Fuentenueva, Granada E-18071, Spain
| | - María T. Martín-Romero
- Departamento de Química Física y T. Aplicada, Instituto Universitario de Investigación en Química Fina y Nanoquímica IUIQFN, Facultad de Ciencias, Universidad de Córdoba (UCO), Campus de Rabanales, Ed. Marie Curie, E-14071 Córdoba, Spain
| | - Luis Camacho
- Departamento de Química Física y T. Aplicada, Instituto Universitario de Investigación en Química Fina y Nanoquímica IUIQFN, Facultad de Ciencias, Universidad de Córdoba (UCO), Campus de Rabanales, Ed. Marie Curie, E-14071 Córdoba, Spain
| | - Juan J. Giner-Casares
- Departamento de Química Física y T. Aplicada, Instituto Universitario de Investigación en Química Fina y Nanoquímica IUIQFN, Facultad de Ciencias, Universidad de Córdoba (UCO), Campus de Rabanales, Ed. Marie Curie, E-14071 Córdoba, Spain
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25
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Enhanced Ordering in Monolayers Containing Glycosphingolipids: Impact of Carbohydrate Structure. Biophys J 2019. [PMID: 29539397 DOI: 10.1016/j.bpj.2017.12.044] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The influence of carbohydrate structure on the ordering of glycosphingolipids (GSLs) and surrounding phospholipids was investigated in monolayers at the air-water interface. Binary mixtures composed of GSLs, chosen to span a range of carbohydrate complexity, and zwitterionic dipalmitoylphosphatidylcholine phospholipid, were studied. X-ray reflectivity was used to measure the out-of-plane structure of the monolayers and characterize the extension and conformation of the GSL carbohydrates. Using synchrotron grazing incidence x-ray diffraction, the in-plane packing of the lipid acyl chains and the area per molecule within ordered domains were characterized at different mole ratios of the two components. Our findings indicate that GSL-containing mixtures, regardless of the carbohydrate size, enhance the ordering of the surrounding lipids, resulting in a larger fraction of ordered phase of the monolayer and greater dimensions of the ordered domains. Reduction of the averaged area per molecule within the ordered domains was also observed but only in the cases where there was a size mismatch between the phospholipid headgroups and GSL components, suggesting that the condensation mechanism involves the relief of steric interactions between headgroups in mixtures.
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26
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Pazin WM, Ruiz GCM, Oliveira OND, Constantino CJL. Interaction of Artepillin C with model membranes: Effects of pH and ionic strength. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2019; 1861:410-417. [DOI: 10.1016/j.bbamem.2018.11.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Revised: 11/13/2018] [Accepted: 11/16/2018] [Indexed: 01/24/2023]
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27
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Pullanchery S, Yang T, Cremer PS. Introduction of Positive Charges into Zwitterionic Phospholipid Monolayers Disrupts Water Structure Whereas Negative Charges Enhances It. J Phys Chem B 2018; 122:12260-12270. [DOI: 10.1021/acs.jpcb.8b08476] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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28
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Campbell RA, Saaka Y, Shao Y, Gerelli Y, Cubitt R, Nazaruk E, Matyszewska D, Lawrence MJ. Structure of surfactant and phospholipid monolayers at the air/water interface modeled from neutron reflectivity data. J Colloid Interface Sci 2018; 531:98-108. [DOI: 10.1016/j.jcis.2018.07.022] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 07/06/2018] [Accepted: 07/06/2018] [Indexed: 10/28/2022]
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29
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Sung W, Krem S, Kim D. Binding of trivalent ions on fatty acid Langmuir monolayer: Fe3+ versus La3+. J Chem Phys 2018; 149:163304. [DOI: 10.1063/1.5028296] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Affiliation(s)
- Woongmo Sung
- Department of Physics, Sogang University, Seoul 121-742, South Korea
| | - Sona Krem
- Department of Physics, Sogang University, Seoul 121-742, South Korea
| | - Doseok Kim
- Department of Physics, Sogang University, Seoul 121-742, South Korea
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30
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Argudo PG, Martín-Romero MT, Camacho L, Carril M, Carrillo-Carrión C, Giner-Casares JJ. Fluorinated CdSe/ZnS quantum dots: Interactions with cell membrane. Colloids Surf B Biointerfaces 2018; 173:148-154. [PMID: 30286431 DOI: 10.1016/j.colsurfb.2018.09.050] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 09/17/2018] [Accepted: 09/21/2018] [Indexed: 11/24/2022]
Abstract
Fluorescent inorganic quantum dots are highly promising for biomedical applications as sensing and imaging agents. However, the low internalization of the quantum dots, as well as for most of the nanoparticles, by living cells is a critical issue which should be solved for success in translational research. In order to increase the internalization rate of inorganic CdSe/ZnS quantum dots, they were functionalized with a fluorinated organic ligand. The fluorinated quantum dots displayed an enhanced surface activity, leading to a significant cell uptake as demonstrated by in vitro experiments with HeLa cells. We combined the experimental and computational results of Langmuir monolayers of the DPPC phospholipid as a model cell membrane with in vitro experiments for analyzing the mechanism of internalization of the fluorinated CdSe/ZnS quantum dots. Surface pressure-molecular area isotherms suggested that the physical state of the DPPC molecules was greatly affected by the quantum dots. UV-vis reflection spectroscopy and Brewster Angle Microscopy as in situ experimental techniques further confirmed the significant surface concentration of quantum dots. The disruption of the ordering of the DPPC molecules was assessed. Computer simulations offered detailed insights in the interaction between the quantum dots and the phospholipid, pointing to a significant modification of the physical state of the hydrophobic region of the phospholipid molecules. This phenomenon appeared as the most relevant step in the internalization mechanism of the fluorinated quantum dots by cells. Thus, this work sheds light on the role of fluorine on the surface of inorganic nanoparticles for enhancing their cellular uptake.
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Affiliation(s)
- Pablo G Argudo
- Institute of Fine Chemistry and Nanochemistry, Department of Physical Chemistry and Applied Thermodynamics, University of Córdoba, Campus Universitario de Rabanales, Edificio Marie Curie, Córdoba, E-14014, Spain
| | - María T Martín-Romero
- Institute of Fine Chemistry and Nanochemistry, Department of Physical Chemistry and Applied Thermodynamics, University of Córdoba, Campus Universitario de Rabanales, Edificio Marie Curie, Córdoba, E-14014, Spain
| | - Luis Camacho
- Institute of Fine Chemistry and Nanochemistry, Department of Physical Chemistry and Applied Thermodynamics, University of Córdoba, Campus Universitario de Rabanales, Edificio Marie Curie, Córdoba, E-14014, Spain
| | - Mónica Carril
- Biofisika Institute (CSIC, UPV/EHU) and Department of Biochemistry and Molecular Biology, University of the Basque Country UPV/EHU, 48940, Leioa, Spain; Ikerbasque, Basque Foundation for Science, Bilbao, 48011, Spain
| | - Carolina Carrillo-Carrión
- CIC biomaGUNE, 20014, San Sebastian, Spain; Center for Research in Biological Chemistry and Molecular Materials (CiQUS), University of Santiago de Compostela, 15782, Santiago de Compostela, Spain.
| | - Juan J Giner-Casares
- Institute of Fine Chemistry and Nanochemistry, Department of Physical Chemistry and Applied Thermodynamics, University of Córdoba, Campus Universitario de Rabanales, Edificio Marie Curie, Córdoba, E-14014, Spain.
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31
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Wang R, Guo Y, Liu H, Chen Y, Shang Y, Liu H. The effect of chitin nanoparticles on surface behavior of DPPC/DPPG Langmuir monolayers. J Colloid Interface Sci 2018; 519:186-193. [DOI: 10.1016/j.jcis.2018.02.021] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 02/04/2018] [Accepted: 02/05/2018] [Indexed: 12/27/2022]
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32
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Adams EM, Verreault D, Jayarathne T, Cochran RE, Stone EA, Allen HC. Surface organization of a DPPC monolayer on concentrated SrCl 2 and ZnCl 2 solutions. Phys Chem Chem Phys 2018; 18:32345-32357. [PMID: 27854367 DOI: 10.1039/c6cp06887a] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Transition metals are known to be enriched in organic-coated marine aerosols, but the impact these cations have on their surface properties is not well understood. Here the effect of Zn2+ enrichment on the surface properties of a dipalmitoylphosphatidylcholine (DPPC) monolayer was investigated and compared to that of the alkaline earth metal Sr2+, an ion not enriched in aerosols. Phase behavior of the DPPC film on concentrated aqueous solutions was probed with surface pressure-area isotherms while domain morphology was monitored with Brewster angle microscopy (BAM). Infrared reflection-absorption spectroscopy (IRRAS) and vibrational sum frequency generation (VSFG) spectroscopy were used to assess the impact of cations on the conformation and orientation of alkyl chains as well as the hydration state of the carbonyl and phosphatidylcholine (PC) moieties. Results of compression isotherms and BAM show that Zn2+ strongly interacts with DPPC molecules, and induces condensation of the monolayer while Sr2+ only weakly interacts with the monolayer in expanded phases. Conformational order and orientation of alkyl chains in the condensed phase are not significantly altered by either cation. IRRAS indicates that Sr2+ has weak interactions with the PC headgroup. Zn2+ ions cause dehydration of carbonyl groups and binds to the phosphate group in a 2 : 1 bridging complex. Findings here suggest that Sr2+ is not enriched in aerosols because it behaves similar to a monovalent ion and only weakly interacts with the monolayer, while enrichment of Zn2+ is due to strong binding to the lipid film.
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Affiliation(s)
- Ellen M Adams
- Department of Chemistry & Biochemistry, The Ohio State University, Columbus, Ohio 43210, USA.
| | - Dominique Verreault
- Department of Chemistry & Biochemistry, The Ohio State University, Columbus, Ohio 43210, USA.
| | | | - Richard E Cochran
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA
| | - Elizabeth A Stone
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, USA
| | - Heather C Allen
- Department of Chemistry & Biochemistry, The Ohio State University, Columbus, Ohio 43210, USA.
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33
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Bhattacharya G, Mitra S, Mandal P, Dutta S, Giri RP, Ghosh SK. Thermodynamics of interaction of ionic liquids with lipid monolayer. Biophys Rev 2018; 10:709-719. [PMID: 29305702 DOI: 10.1007/s12551-017-0390-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Accepted: 12/13/2017] [Indexed: 11/29/2022] Open
Abstract
Understanding the interaction of ionic liquids with cellular membrane becomes utterly important to comprehend the activities of these liquids in living organisms. Lipid monolayer formed at the air-water interface is employed as a model system to follow this interaction by investigating important thermodynamic parameters. The penetration kinetics of the imidazolium-based ionic liquid 1-decyl-3-methylimidazolium tetrafluoroborate ([DMIM][BF4]) into the zwitterionic 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) lipid layer is found to follow the Boltzmann-like equation that reveals the characteristic time constant which is observed to be the function of initial surface pressure. The enthalpy and entropy calculated from temperature-dependent pressure-area isotherms of the monolayer show that the added ionic liquids bring about a disordering effect in the lipid film. The change in Gibbs free energy indicates that an ionic liquid with longer chain has a far greater disordering effect compared to an ionic liquid with shorter chain. The differential scanning calorimetric measurement on a multilamellar vesicle system shows the main phase transition temperature to shift to a lower value, which, again, indicates the disordering effect of the ionic liquid on lipid membrane. All these studies fundamentally point out that, when ionic liquids interact with lipid molecules, the self-assembled structure of a cellular membrane gets perturbed, which may be the mechanism of these molecules having adverse effects on living organisms.
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Affiliation(s)
- G Bhattacharya
- Department of Physics, School of Natural Sciences, Shiv Nadar University, NH-91, Tehsil Dadri, G. B. Nagar, Uttar Pradesh, 201314, India
| | - S Mitra
- Department of Physics, School of Natural Sciences, Shiv Nadar University, NH-91, Tehsil Dadri, G. B. Nagar, Uttar Pradesh, 201314, India
| | - P Mandal
- Department of Physics, School of Natural Sciences, Shiv Nadar University, NH-91, Tehsil Dadri, G. B. Nagar, Uttar Pradesh, 201314, India
| | - S Dutta
- Department of Chemistry, School of Natural Sciences, Shiv Nadar University, NH-91, Tehsil Dadri, G. B. Nagar, Uttar Pradesh, 201314, India
| | - R P Giri
- Saha Institute of Nuclear Physics, Bidhannagar, Kolkata, 700064, India
| | - S K Ghosh
- Department of Physics, School of Natural Sciences, Shiv Nadar University, NH-91, Tehsil Dadri, G. B. Nagar, Uttar Pradesh, 201314, India.
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Broniatowski M, Binczycka M, Wójcik A, Flasiński M, Wydro P. Polycyclic aromatic hydrocarbons in model bacterial membranes – Langmuir monolayer studies. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2017; 1859:2402-2412. [DOI: 10.1016/j.bbamem.2017.09.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 08/31/2017] [Accepted: 09/14/2017] [Indexed: 12/16/2022]
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Hallett JE, Hayward DW, Arnold T, Bartlett P, Richardson RM. X-ray reflectivity reveals ionic structure at liquid crystal-aqueous interfaces. SOFT MATTER 2017; 13:5535-5542. [PMID: 28795175 DOI: 10.1039/c7sm01261f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Here X-ray reflectivity has been used to determine the structure of liquid crystal monolayers for different cyanobiphenyl homologues supported on aqueous solutions of two different salt species. Sodium iodide induces homeotropic ordering for all of the monolayer forming liquid crystal homologues studied here, and forms a Stern layer of iodide ions at the liquid crystal cyano headgroup, similar to the case of lipids or surfactants supported on electrolyte solutions. The liquid crystal headgroups were also found to penetrate into the water surface when binding with iodide ions. Sodium bromide, however, does not form the same localisation of ions close to a liquid crystal monolayer, and instead appears to produce no noticeable change in the scattering length density of the liquid crystal monolayer compared to pure water. However, on further compression the X-ray reflectivity dramatically changes, revealing the emergence of the so-called "trilayer" structure for 5CB and 8CB. This transition occurs at a lower areal density for sodium bromide than for pure water, and unlike for the uncompressed film, a layer of bromide ions was found at the trilayer-water interface.
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Affiliation(s)
- James E Hallett
- H. H. Wills Physics Laboratory, Tyndall Avenue, Bristol, BS8 1TL, UK.
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36
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Leontidis E. Investigations of the Hofmeister series and other specific ion effects using lipid model systems. Adv Colloid Interface Sci 2017; 243:8-22. [PMID: 28395857 DOI: 10.1016/j.cis.2017.04.001] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Accepted: 04/02/2017] [Indexed: 11/28/2022]
Abstract
From the ion point-of-view specific ion effects (SIE) arise as an interplay of ionic size and shape and charge distribution. However in aqueous systems SIE invariably involve water, and at surfaces they involve both interacting surface groups and local fields emanating from the surface. In this review we highlight the fundamental importance of ionic size and hydration on SIE, properties which encompass all types of interacting forces and ion-pairing phenomena and make the Hofmeister or lyotropic series of ions pertinent to a broad range of systems and phenomena. On the other hand ionic hydrophobicity and complexation capacity also determine ionic behavior in a variety of contexts. Over the years we have carried out carefully designed experiments on a few selected soft matter model systems, most involving zwitterionic phospholipids, to assess the importance of fundamental ionic and interfacial properties on ion specific effects. By tuning down direct Coulomb interactions, working with different interfacial geometries, and carefully tuning ion-lipid headgroup interactions it is possible to assess the importance of different parameters contributing to ion specific behavior. We argue that the majority of specific ion effects involving relatively simple soft matter systems can be at least qualitatively understood and demystified.
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Wang Q, Li W, Hu N, Chen X, Fan T, Wang Z, Yang Z, Cheney MA, Yang J. Ion concentration effect (Na + and Cl -) on lipid vesicle formation. Colloids Surf B Biointerfaces 2017; 155:287-293. [PMID: 28437754 DOI: 10.1016/j.colsurfb.2017.04.030] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 04/08/2017] [Accepted: 04/11/2017] [Indexed: 01/14/2023]
Abstract
Lipid vesicle formation is known to be suppressed in salt solutions, but the mechanism of this phenomenon remains unclear. In order to better understand this issue, the effect of salt concentrations (0-800mM) of sodium chloride on the behavior of L-α-phosphatidylcholine (PC) in aqueous solution was investigated in this work. The results showed that fusion among vesicles, micelles and bilayers may be essential for vesicle formation. With addition of ions and an increase in ion concentration, the lipids became constrained in lateral movement and packed increasingly tightly. The resulted hard supported phospholipid bilayers (SPBs) were thus more difficult to detach from the substrate to form vesicles. These phenomena were tried to be explained at molecular level. Hydrophobic effect is the original cause of lipid vesicle formation, which in fact is absence of attraction between the involved substances. That is to say, the stronger the 3D network was bounded in the medium, the stronger the hydrophobic repulsion on the lipids would be. This might be one reason for the suppression of vesicle formation in salt solution.
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Affiliation(s)
- Qiong Wang
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, Chongqing Engineering Research Center of Medical Electronics Technology (Chongqing University), Bioengineering College, Chongqing University, Chongqing, 400030, China
| | - Wenman Li
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, Chongqing Engineering Research Center of Medical Electronics Technology (Chongqing University), Bioengineering College, Chongqing University, Chongqing, 400030, China
| | - Ning Hu
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, Chongqing Engineering Research Center of Medical Electronics Technology (Chongqing University), Bioengineering College, Chongqing University, Chongqing, 400030, China.
| | - Xi Chen
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, Chongqing Engineering Research Center of Medical Electronics Technology (Chongqing University), Bioengineering College, Chongqing University, Chongqing, 400030, China
| | - Ting Fan
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, Chongqing Engineering Research Center of Medical Electronics Technology (Chongqing University), Bioengineering College, Chongqing University, Chongqing, 400030, China
| | - Zhenyu Wang
- Department of Biomedical Engineering, Chongqing Medical University, Chongqing, 400016, China
| | - Zhong Yang
- Department of Laboratory Medicine, Southwest Hospital, Third Military Medical University, Chongqing, 400038, China
| | - Marcos A Cheney
- Department of Natural Sciences, University of Maryland Eastern Shore, Princess Anne, MD, 21853, USA
| | - Jun Yang
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, Chongqing Engineering Research Center of Medical Electronics Technology (Chongqing University), Bioengineering College, Chongqing University, Chongqing, 400030, China.
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38
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Kučerka N, Dushanov E, Kholmurodov KT, Katsaras J, Uhríková D. Calcium and Zinc Differentially Affect the Structure of Lipid Membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:3134-3141. [PMID: 28277666 DOI: 10.1021/acs.langmuir.6b03228] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Interactions of calcium (Ca2+) and zinc (Zn2+) cations with biomimetic membranes made of dipalmitoylphosphatidylcholine (DPPC) were studied by small angle neutron diffraction (SAND). Experiments show that the structure of these lipid bilayers is differentially affected by the two divalent cations. Initially, both Ca2+ and Zn2+ cause DPPC bilayers to thicken, while further increases in Ca2+ concentration result in the bilayer thinning, eventually reverting to having the same thickness as pure DPPC. The binding of Zn2+, on the other hand, causes the bilayers to swell to a maximum thickness, and the addition of more Zn2+ does not result in a further thickening of the membrane. Agreement between our results obtained using oriented planar membranes and those from vesicular samples implies that the effect of cations on bilayer thickness is the result of electrostatic interactions, rather than geometrical constraints due to bilayer curvature. This notion is further reinforced by MD simulations. Finally, the radial distribution functions reveal a strong interaction between Ca2+ and the phosphate oxygens, while Zn2+ shows a much weaker binding specificity.
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Affiliation(s)
- Norbert Kučerka
- Department of Physical Chemistry of Drugs, Faculty of Pharmacy, Comenius University in Bratislava , 83232 Bratislava, Slovakia
| | | | | | - John Katsaras
- Department of Physics and Astronomy, University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Daniela Uhríková
- Department of Physical Chemistry of Drugs, Faculty of Pharmacy, Comenius University in Bratislava , 83232 Bratislava, Slovakia
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Mangiarotti A, Wilke N. Electrostatic interactions at the microscale modulate dynamics and distribution of lipids in bilayers. SOFT MATTER 2017; 13:686-694. [PMID: 28009904 DOI: 10.1039/c6sm01957a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
For decades, it has been assumed that electrostatic long-range (micron distances) repulsions in lipid bilayers are negligible due to screening from the aqueous milieu. This concept, mostly derived from theoretical calculations, is broadly accepted in the biophysical community. Here we present experimental evidence showing that domain-domain electrostatic repulsions in charged and also in neutral lipid bilayers regulate the diffusion, in-plane structuring and merging of lipid domains in the micron range. All the experiments were performed on both, lipid monolayers and bilayers, and the remarkable similarity in the results found in bilayers compared to monolayers led us to propose that inter-domain repulsions occur mainly within the plane of the membrane. Finally, our results indicate that electrostatic interactions between the species inserted in a cell membrane are not negligible, not only at nanometric but also at larger distances, suggesting another manner for regulating the membrane properties.
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Affiliation(s)
- Agustín Mangiarotti
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC, UNC-CONICET), Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de la Torre y Medina Allende, Ciudad Universitaria, X5000HUA, Córdoba, Argentina.
| | - Natalia Wilke
- Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC, UNC-CONICET), Departamento de Química Biológica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Haya de la Torre y Medina Allende, Ciudad Universitaria, X5000HUA, Córdoba, Argentina.
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40
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Islam MS, Shortall SM, Mekhail GM, Callender SP, Madkhali O, Bharwani Z, Ayyash D, Kobernyk K, Wettig SD. Effect of counterions on the micellization and monolayer behaviour of cationic gemini surfactants. Phys Chem Chem Phys 2017; 19:10825-10834. [DOI: 10.1039/c7cp00775b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The effect of various inorganic and organic counterions on the aggregation behavior of gemini surfactants was examined to investigate the dominant influence of the anions on their micellization and aggregation behavior.
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Affiliation(s)
- M. S. Islam
- School of Pharmacy, University of Waterloo
- Waterloo ON N2L 3G1
- Canada
- Waterloo Institute for Nanotechnology
- University of Waterloo
| | - S. M. Shortall
- School of Pharmacy, University of Waterloo
- Waterloo ON N2L 3G1
- Canada
- Waterloo Institute for Nanotechnology
- University of Waterloo
| | - G. M. Mekhail
- School of Pharmacy, University of Waterloo
- Waterloo ON N2L 3G1
- Canada
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University
- Abbasiya Square
| | - S. P. Callender
- School of Pharmacy, University of Waterloo
- Waterloo ON N2L 3G1
- Canada
- Waterloo Institute for Nanotechnology
- University of Waterloo
| | - O. Madkhali
- School of Pharmacy, University of Waterloo
- Waterloo ON N2L 3G1
- Canada
- Waterloo Institute for Nanotechnology
- University of Waterloo
| | - Z. Bharwani
- School of Pharmacy, University of Waterloo
- Waterloo ON N2L 3G1
- Canada
| | - D. Ayyash
- School of Pharmacy, University of Waterloo
- Waterloo ON N2L 3G1
- Canada
| | - K. Kobernyk
- School of Pharmacy, University of Waterloo
- Waterloo ON N2L 3G1
- Canada
| | - S. D. Wettig
- School of Pharmacy, University of Waterloo
- Waterloo ON N2L 3G1
- Canada
- Waterloo Institute for Nanotechnology
- University of Waterloo
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41
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Sagami T, Tahara YO, Miyata M, Miyake H, Shinoda S. Luminescence sensing of weakly-hydrated anions in aqueous solution by self-assembled europium(iii) complexes. Chem Commun (Camb) 2017; 53:3967-3970. [DOI: 10.1039/c7cc00477j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Perchlorate anions in water could be sensed by luminescence decrease of europium(iii) using a self-assembly system.
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Affiliation(s)
- Takuya Sagami
- Department of Chemistry
- Graduate School of Science
- Osaka City University
- Osaka 558-8585
- Japan
| | - Yuhei O. Tahara
- Department of Biology
- Graduate School of Science
- Osaka City University
- Osaka 558-8585
- Japan
| | - Makoto Miyata
- Department of Biology
- Graduate School of Science
- Osaka City University
- Osaka 558-8585
- Japan
| | - Hiroyuki Miyake
- Department of Chemistry
- Graduate School of Science
- Osaka City University
- Osaka 558-8585
- Japan
| | - Satoshi Shinoda
- Department of Chemistry
- Graduate School of Science
- Osaka City University
- Osaka 558-8585
- Japan
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42
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Selladurai SL, Miclette Lamarche R, Schmidt R, DeWolf CE. Model Lung Surfactant Films: Why Composition Matters. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:10767-10775. [PMID: 27641759 DOI: 10.1021/acs.langmuir.6b02945] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Lung surfactant replacement therapies, Survanta and Infasurf, and two lipid-only systems both containing saturated and unsaturated phospholipids and one containing additional palmitic acid were used to study the impact of buffered saline on the surface activity, morphology, rheology, and structure of Langmuir monolayer model membranes. Isotherms and Brewster angle microscopy show that buffered saline subphases induce a film expansion, except when the cationic protein, SP-B, is present in sufficient quantities to already screen electrostatic repulsion, thus limiting the effect of changing pH and adding counterions. Grazing incidence X-ray diffraction results indicate an expansion not only of the liquid expanded phase but also an expansion of the lattice of the condensed phase. The film expansion corresponded in all cases with a significant reduction in the viscosity and elasticity of the films. The viscoelastic parameters are dominated by liquid expanded phase properties and do not appear to be dependent on the structure of the condensed phase domains in a phase separated film. The results highlight that the choice of subphase and film composition is important for meaningful interpretations of measurements using model systems.
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Affiliation(s)
- Sahana L Selladurai
- Department of Chemistry and Biochemistry and Centre for NanoScience Research, Concordia University , 7141 Sherbrooke Street West, Montreal, Canada H4B 1R6
| | - Renaud Miclette Lamarche
- Department of Chemistry and Biochemistry and Centre for NanoScience Research, Concordia University , 7141 Sherbrooke Street West, Montreal, Canada H4B 1R6
| | - Rolf Schmidt
- Department of Chemistry and Biochemistry and Centre for NanoScience Research, Concordia University , 7141 Sherbrooke Street West, Montreal, Canada H4B 1R6
| | - Christine E DeWolf
- Department of Chemistry and Biochemistry and Centre for NanoScience Research, Concordia University , 7141 Sherbrooke Street West, Montreal, Canada H4B 1R6
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Peshkova TV, Minkov IL, Tsekov R, Slavchov RI. Adsorption of Ions at Uncharged Insoluble Monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:8858-8871. [PMID: 27529571 DOI: 10.1021/acs.langmuir.6b02349] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A method is proposed for the experimental determination of the adsorption of inorganic electrolytes at a surface covered with insoluble surfactant monolayer. This task is complicated by the fact that the change of the salt concentration alters both chemical potentials of the electrolyte and the surfactant. Our method resolves the question by combining data for the surface pressure versus area of the monolayer at several salt concentrations with data for the equilibrium spreading pressure of crystals of the surfactant (used to fix a standard state). We applied the method to alcohols spread at the surface of concentrated halide solutions. The measured salt adsorption is positive and has nonmonotonic dependence on the area per surfactant molecule. For the liquid expanded film, depending on the concentration, there is one couple of ions adsorbed per each 3-30 surfactant molecules. We analyzed which ion, the positive or the negative, stands closer to the surface, by measuring the effect of NaCl on the Volta potential of the monolayer. The potentiometric data suggest that Na(+) is specifically adsorbed, while Cl(-) remains in the diffuse layer, i.e., the surface is positively charged. The observed reverse Hofmeister series of the adsorptions of NaF, NaCl, and NaBr suggests the same conclusion holds for all these salts. The force that causes the adsorption of Na(+) seems to be the interaction of the ion with the dipole moment of the monolayer.
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Affiliation(s)
- Tatyana V Peshkova
- Department of Physical Chemistry, Faculty of Chemistry and Pharmacy, Sofia University , 1 J. Bourchier Boulevard, 1164 Sofia, Bulgaria
| | - Ivan L Minkov
- Department of Physical Chemistry, Faculty of Chemistry and Pharmacy, Sofia University , 1 J. Bourchier Boulevard, 1164 Sofia, Bulgaria
- Department of Chemistry, Biochemistry, Physiology, and Pathophysiology, Faculty of Medicine, Sofia University , 1 Koziak Street, 1407 Sofia, Bulgaria
| | - Roumen Tsekov
- Department of Physical Chemistry, Faculty of Chemistry and Pharmacy, Sofia University , 1 J. Bourchier Boulevard, 1164 Sofia, Bulgaria
| | - Radomir I Slavchov
- Department of Physical Chemistry, Faculty of Chemistry and Pharmacy, Sofia University , 1 J. Bourchier Boulevard, 1164 Sofia, Bulgaria
- Department of Chemical Engineering and Biotechnology, Cambridge University , Pembroke Street, New Museums Site, CB2 3RA Cambridge, United Kingdom
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44
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Adams EM, Casper CB, Allen HC. Effect of cation enrichment on dipalmitoylphosphatidylcholine (DPPC) monolayers at the air-water interface. J Colloid Interface Sci 2016; 478:353-64. [DOI: 10.1016/j.jcis.2016.06.016] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2016] [Revised: 06/02/2016] [Accepted: 06/03/2016] [Indexed: 01/07/2023]
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45
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Wang W, Zhang H, Feng S, San Emeterio J, Mallapragada S, Vaknin D. Iron Ion and Iron Hydroxide Adsorption to Charge-Neutral Phosphatidylcholine Templates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:7664-7670. [PMID: 27409514 DOI: 10.1021/acs.langmuir.6b01851] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Surface-sensitive X-ray scattering and spectroscopy techniques reveal significant adsorption of iron ions and iron-hydroxide (Fe(III)) complexes to a charge-neutral zwitterionic template of phosphatidylcholine (PC). The PC template is formed by a Langmuir monolayer of dipalmitoyl-PC (DPPC) that is spread on the surface of 2 to 40 μM FeCl3 solutions at physiological levels of KCl (100 mM). At 40 μM of Fe(III) as many as ∼3 iron atoms are associated with each PC group. Grazing incidence X-ray diffraction measurements indicate a significant disruption in the in-plane ordering of DPPC molecules upon iron adsorption. The binding of iron-hydroxide complexes to a neutral PC surface is yet another example of nonelectrostatic, presumably covalent bonding to a charge-neutral organic template. The strong binding and the disruption of in-plane lipid structure has biological implications on the integrity of PC-derived lipid membranes, including those based on sphingomyelin.
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Affiliation(s)
- Wenjie Wang
- Division of Materials Sciences and Engineering, Ames Laboratory, USDOE , Ames, Iowa 50011, United States
| | - Honghu Zhang
- Ames Laboratory and Department of Materials Science and Engineering, Iowa State University , Ames, Iowa 50011, United States
| | - Shuren Feng
- Ames Laboratory and Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University , Ames, Iowa 50011, United States
| | - Josue San Emeterio
- Division of Materials Sciences and Engineering, Ames Laboratory, USDOE , Ames, Iowa 50011, United States
| | - Surya Mallapragada
- Ames Laboratory and Department of Chemical and Biological Engineering, Iowa State University , Ames, Iowa 50011, United States
| | - David Vaknin
- Ames Laboratory and Department of Physics and Astronomy, Iowa State University , Ames, Iowa 50011, United States
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46
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Hazell G, Gee AP, Arnold T, Edler KJ, Lewis SE. Langmuir monolayers composed of single and double tail sulfobetaine lipids. J Colloid Interface Sci 2016; 474:190-8. [DOI: 10.1016/j.jcis.2016.04.020] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Revised: 04/13/2016] [Accepted: 04/14/2016] [Indexed: 11/16/2022]
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47
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Membrane binding of peptide models for early stages of amyloid formation: Lipid packing counts more than charge. Chem Phys Lipids 2016; 198:28-38. [DOI: 10.1016/j.chemphyslip.2016.02.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Revised: 02/04/2016] [Accepted: 02/27/2016] [Indexed: 11/17/2022]
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48
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49
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The interfacial properties of the peptide Polybia-MP1 and its interaction with DPPC are modulated by lateral electrostatic attractions. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:393-402. [DOI: 10.1016/j.bbamem.2015.12.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Revised: 11/16/2015] [Accepted: 12/04/2015] [Indexed: 11/18/2022]
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50
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Biophysical characterization of monofilm model systems composed of selected tear film phospholipids. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2015; 1858:403-14. [PMID: 26657693 DOI: 10.1016/j.bbamem.2015.11.025] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Revised: 11/13/2015] [Accepted: 11/21/2015] [Indexed: 02/06/2023]
Abstract
The tear film protects the eye from foreign particles and pathogens, prevents excess evaporation, provides lubrication, and maintains a high quality optical surface necessary for vision. The anterior layer of tear film consists of polar and non-polar lipid layers. The polar lipids form a monolayer on the aqueous subphase, acting as surfactants for the non-polar lipid multilayer. A tear film polar lipid biomimetic consisting of dipalmitoyl phosphatidylcholine (DPPC), dipalmitoyl phosphatidylethanolamine (DPPE), palmitoyl glucosylceramide (PGC), and palmitoyl sphingomyelin (PSM) was characterized using Langmuir monolayers and Brewster angle microscopy (BAM). Lipid combinations formed very stable monolayers, especially those containing DPPC or PSM. Surface experiments and elasticity analyses revealed that PGC resulted in more condensed and rigid mixed monolayers. DPPE provided resistance to large changes in lipid ordering over a wide surface pressure range. Ternary mixtures containing DPPE and PGC with either DPPC or PSM experienced the greatest lipid ordering within the natural tear film surface pressure range suggesting that these lipids are important to maintain tear film integrity during the inter-blink period. Finally, BAM images revealed unique structures within monolayers of DPPC, DPPE, and PGC at the natural tear film surface pressure. 3D analysis of these domains suggested either the formation of multilayers or outward protrusions at surface pressures far below the point of irreversible collapse as seen on the isotherm. This entails that the polar lipids of tear film may be capable of multilayer formation or outward folding as a mechanism to prevent rupture of the tear film during a blink.
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