1
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Hao X, Gu Q, Isborn C, Vasquez JR, Long MP, Ye T. Quantitative measurement of cation-mediated adhesion of DNA to anionic surfaces. SOFT MATTER 2024. [PMID: 39194357 DOI: 10.1039/d3sm01733h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/29/2024]
Abstract
Anionic polyelectrolytes, such as DNA, are attracted to anionic surfaces in the presence of multivalent cations. A major barrier toward molecular-level understanding of these attractive interactions is the paucity of measurements of the binding strength. Here, atomic force microscopy-based single molecule force spectroscopy was used to quantify the binding free energy of double-stranded DNA to an anionic surface, with complementary density functional theory calculations of the binding energies of metal ion-ligand complexes. The results support both electrostatic attraction and ion-specific binding. Our study suggests that the correlated interactions between counterions are responsible for attraction between DNA and an anionic surface, but the strength of this attraction is modulated by the identity of the metal ion. We propose a mechanism in which the strength of metal-ligand binding, as well as the preference for particular binding sites, influence both the concentration dependence and the strength of the DNA-surface interactions.
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Affiliation(s)
- Xian Hao
- Department of Chemistry and Biochemistry, School of Natural Sciences, University of California, Merced, California 95343, USA.
- School of Public Health and Jiangxi Provincial Key Laboratory of Disease Prevention and Public Health, Nanchang University, Nanchang, Jiangxi 330006, China
| | - Qufei Gu
- Materials and Biomaterials Science and Engineering, School of Engineering, University of California, Merced, California 95343, USA
| | - Christine Isborn
- Department of Chemistry and Biochemistry, School of Natural Sciences, University of California, Merced, California 95343, USA.
| | - Jesus Rodriguez Vasquez
- Department of Chemistry and Biochemistry, School of Natural Sciences, University of California, Merced, California 95343, USA.
| | - Makenzie Provorse Long
- Department of Chemistry and Biochemistry, Creighton University, Omaha, Nebraska 68178, USA.
| | - Tao Ye
- Department of Chemistry and Biochemistry, School of Natural Sciences, University of California, Merced, California 95343, USA.
- Materials and Biomaterials Science and Engineering, School of Engineering, University of California, Merced, California 95343, USA
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2
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Prüßner T, Meinderink D, Zhu S, Orive AG, Kielar C, Huck M, Steinrück HG, Keller A, Grundmeier G. Molecular Adhesion of a Pilus-Derived Peptide Involved in Pseudomonas aeruginosa Biofilm Formation on Non-Polar ZnO-Surfaces. Chemistry 2024; 30:e202302464. [PMID: 37909474 DOI: 10.1002/chem.202302464] [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: 07/31/2023] [Revised: 10/30/2023] [Accepted: 10/30/2023] [Indexed: 11/03/2023]
Abstract
Bacterial colonization and biofilm formation on abiotic surfaces are initiated by the adhesion of peptides and proteins. Understanding the adhesion of such peptides and proteins at a molecular level thus represents an important step toward controlling and suppressing biofilm formation on technological and medical materials. This study investigates the molecular adhesion of a pilus-derived peptide that facilitates biofilm formation of Pseudomonas aeruginosa, a multidrug-resistant opportunistic pathogen frequently encountered in healthcare settings. Single-molecule force spectroscopy (SMFS) was performed on chemically etched ZnO11 2 ‾ 0 ${\left(11\bar{2}0\right)}$ surfaces to gather insights about peptide adsorption force and its kinetics. Metal-free click chemistry for the fabrication of peptide-terminated SMFS cantilevers was performed on amine-terminated gold cantilevers and verified by X-ray photoelectron spectroscopy (XPS) and polarization-modulated infrared reflection absorption spectroscopy (PM-IRRAS). Atomic force microscopy (AFM) and XPS analyses reveal stable topographies and surface chemistries of the substrates that are not affected by SMFS. Rupture events described by the worm-like chain model (WLC) up to 600 pN were detected for the non-polar ZnO surfaces. The dissociation barrier energy at zero force ΔG(0), the transition state distance xb and bound-unbound dissociation rate at zero force koff (0) for the single crystalline substrate indicate that coordination and hydrogen bonds dominate the peptide/surface interaction.
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Affiliation(s)
- Tim Prüßner
- Technical and Macromolecular Chemistry, Paderborn University, Warburger Str. 100, 33098, Paderborn, Germany
| | - Dennis Meinderink
- Technical and Macromolecular Chemistry, Paderborn University, Warburger Str. 100, 33098, Paderborn, Germany
| | - Siqi Zhu
- Technical and Macromolecular Chemistry, Paderborn University, Warburger Str. 100, 33098, Paderborn, Germany
| | - Alejandro G Orive
- Department of Chemistry, Materials and Nanotechnology Institute, University of La Laguna, Avda. Astrofisico Francisco Sánchez s/n, 38206, San Cristóbal de La Laguna, Spain
| | - Charlotte Kielar
- Insitute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328, Dresden, Germany
| | - Marten Huck
- Chemistry Department, Paderborn University, 33098, Paderborn, Germany
| | | | - Adrian Keller
- Technical and Macromolecular Chemistry, Paderborn University, Warburger Str. 100, 33098, Paderborn, Germany
| | - Guido Grundmeier
- Technical and Macromolecular Chemistry, Paderborn University, Warburger Str. 100, 33098, Paderborn, Germany
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3
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Eskhan A, AlQasas N, Johnson D. Interaction Mechanisms and Predictions of the Biofouling of Polymer Films: A Combined Atomic Force Microscopy and Quartz Crystal Microbalance with Dissipation Monitoring Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:6592-6612. [PMID: 37104647 PMCID: PMC10173465 DOI: 10.1021/acs.langmuir.3c00587] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Biofouling of polymeric membranes is a severe problem in water desalination and treatment applications. A fundamental understanding of biofouling mechanisms is necessary to control biofouling and develop more efficient mitigation strategies. To shed light on the type of forces that govern the interactions between biofoulants and membranes, biofoulant-coated colloidal AFM probes were employed to investigate the biofouling mechanisms of two model biofoulants, BSA and HA, toward an array of polymer films commonly used in membrane synthesis, which included CA, PVC, PVDF, and PS. These experiments were combined with quartz crystal microbalance with dissipation monitoring (QCM-D) measurements. The Derjaguin, Landau, Verwey, and Overbeek (DLVO) and the extended-DLVO (XDLVO) theoretical models were applied to decouple the overall adhesion interactions between the biofoulants and the polymer films into their component interactions, i.e., electrostatic (El), Lifshitz-van der Waals (LW), and Lewis acid-base (AB) interactions. The XDLVO model was found to predict better the AFM colloidal probe adhesion data and the QCM-D adsorption behavior of BSA onto the polymer films than the DLVO model. The ranking of the polymer films' adhesion strengths and adsorption quantities was inversely proportional to their γ- values. Higher normalized adhesion forces were quantified for the BSA-coated colloidal probes with the polymer films than the HA-coated colloidal probes. Similarly, in QCM-D measurements, BSA was found to cause larger adsorption mass shifts, faster adsorption rates, and more condensed fouling layers than HA. A linear correlation (R2 = 0.96) was obtained between the adsorption standard free energy changes (ΔGads°) estimated for BSA from the equilibrium QCM-D adsorption experiments and the AFM normalized adhesion energies (WAFM/R) estimated for BSA from the AFM colloidal probe measurements. Eventually, an indirect approach was presented to calculate the surface energy components of biofoulants characterized by high porosities from Hansen dissolution tests to perform the DLVO/XDLVO analyses.
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Affiliation(s)
- Asma Eskhan
- NYUAD Water Research Center, New York University Abu Dhabi (NYUAD), 129188 Abu Dhabi, UAE
| | - Neveen AlQasas
- NYUAD Water Research Center, New York University Abu Dhabi (NYUAD), 129188 Abu Dhabi, UAE
| | - Daniel Johnson
- NYUAD Water Research Center, New York University Abu Dhabi (NYUAD), 129188 Abu Dhabi, UAE
- Division of Engineering, New York University Abu Dhabi, 129188 Abu Dhabi, UAE
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4
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Combined in-situ attenuated total reflection-Fourier transform infrared spectroscopy and single molecule force studies of poly(acrylic acid) at electrolyte/oxide interfaces at acidic pH. J Colloid Interface Sci 2022; 615:563-576. [DOI: 10.1016/j.jcis.2022.01.175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 01/15/2022] [Accepted: 01/26/2022] [Indexed: 11/20/2022]
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5
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Farshadinia A, Kolahdoozan M. A new porous copolymer electrocatalyst: the optimal synthesis, characterization, and application for the measurement of amoxicillin. J APPL ELECTROCHEM 2019. [DOI: 10.1007/s10800-018-01282-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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6
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Tang Y, Zhang X, Choi P, Xu Z, Liu Q. Contributions of van der Waals Interactions and Hydrophobic Attraction to Molecular Adhesions on a Hydrophobic MoS 2 Surface in Water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:14196-14203. [PMID: 30373365 DOI: 10.1021/acs.langmuir.8b02636] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Pushing the boundaries of the investigation of hydrophobic attraction (HA) to the molecular scale readily ensures the collection of experimental results free of secondary effects, thereby facilitating the unraveling of the underlying mechanism by providing clean experimental results that truly reflect the hydrophobic attraction. Regardless of the feasibility of this approach, investigations using this promising method are stagnant due to the difficulties in determining the individual contributions of HA and van der Waals (vdW) interactions at the molecular scale. Here, a novel approach was proposed for the first time to determine the individual contributions of vdW interactions and HA by studying the single-molecule adhesion forces of a neutral oligo ethylene glycol methacrylate copolymer on a MoS2 crystal exposed to different water chemistry. The anisotropic surface properties of MoS2 enabled the partitioning of vdW interactions and hydrophobic attraction in total single-molecule adhesion forces and also enabled determining the contribution of electrostatic interaction (ESI). When the presence of ESI is excluded, the study of single-molecule adhesion forces using single-molecule force spectroscopy (SMFS) revealed that the contribution of vdW interactions to total molecular interactions was smaller than 9 pN. The strong single-molecule adhesion forces of oligo ethylene glycol copolymer on the hydrophobic basal surface of MoS2 demonstrated that HA plays a dominant role with contribution up to 89% to the total single-molecule adhesion force. By utilizing the derived theoretical model, we quantified the individual contribution of each fundamental interaction under a variety of conditions. This study proposed a facile approach to quantitatively clarify the roles of vdW interactions and HA at the molecular scale, which may help assist future experimental and theoretical investigations of hydrophobic (solvophobic) effects and vdW interactions in aqueous solutions.
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Affiliation(s)
- Yuechao Tang
- Department of Chemical and Materials Engineering , University of Alberta , Edmonton , Alberta T6G 1H9 , Canada
| | - Xurui Zhang
- Department of Chemical and Materials Engineering , University of Alberta , Edmonton , Alberta T6G 1H9 , Canada
| | - Phillip Choi
- Department of Chemical and Materials Engineering , University of Alberta , Edmonton , Alberta T6G 1H9 , Canada
| | - Zhenghe Xu
- Department of Chemical and Materials Engineering , University of Alberta , Edmonton , Alberta T6G 1H9 , Canada
| | - Qingxia Liu
- Department of Chemical and Materials Engineering , University of Alberta , Edmonton , Alberta T6G 1H9 , Canada
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7
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Sun L, Riedel R, Stanciu SG, Yang F, Hampp N, Xu L, Wu A. Investigations on the elasticity of functional gold nanoparticles using single-molecule force spectroscopy. J Mater Chem B 2018; 6:2960-2971. [DOI: 10.1039/c7tb03309e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
In this focused review we turn our attention towards several approaches for detecting the elasticity of NPs, systematically summarizing the divergent elasticity values of distinct gold nanoparticles (AuNPs) with different surfaces.
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Affiliation(s)
- Li Sun
- College of Science
- Nanjing Forestry University
- Nanjing
- P. R. China
- CAS Key Laboratory of Magnetic Materials and Devices & Key Laboratory of Additive Manufacturing Materials of Zhejiang Province & Division of Functional Materials and Nanodevices
| | - René Riedel
- Fachbereich Chemie
- Philipps Universität Marburg
- Marburg
- Germany
| | - Stefan G. Stanciu
- Center for Microscopy-Microanalysis and Information Processing
- University Politehnica of Bucharest
- Bucharest
- Romania
| | - Fang Yang
- CAS Key Laboratory of Magnetic Materials and Devices & Key Laboratory of Additive Manufacturing Materials of Zhejiang Province & Division of Functional Materials and Nanodevices
- Ningbo Institute of Materials Technology and Engineering
- Chinese Academy of Sciences
- Ningbo
- P. R. China
| | - Norbert Hampp
- Fachbereich Chemie
- Philipps Universität Marburg
- Marburg
- Germany
| | - Li Xu
- College of Science
- Nanjing Forestry University
- Nanjing
- P. R. China
| | - Aiguo Wu
- CAS Key Laboratory of Magnetic Materials and Devices & Key Laboratory of Additive Manufacturing Materials of Zhejiang Province & Division of Functional Materials and Nanodevices
- Ningbo Institute of Materials Technology and Engineering
- Chinese Academy of Sciences
- Ningbo
- P. R. China
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8
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9
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Das P, Reches M. Review insights into the interactions of amino acids and peptides with inorganic materials using single molecule force spectroscopy. Biopolymers 2015; 104:480-94. [DOI: 10.1002/bip.22655] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Revised: 03/18/2015] [Accepted: 03/30/2015] [Indexed: 01/11/2023]
Affiliation(s)
- Priyadip Das
- Institute of Chemistry, The Hebrew University of Jerusalem; 91904 Jerusalem Israel
- The Center for Nanoscience and Nanotechnology; The Hebrew University of Jerusalem; 91904 Jerusalem Israel
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10
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Stetter FWS, Kienle S, Krysiak S, Hugel T. Investigating single molecule adhesion by atomic force spectroscopy. J Vis Exp 2015:e52456. [PMID: 25867282 DOI: 10.3791/52456] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Atomic force spectroscopy is an ideal tool to study molecules at surfaces and interfaces. An experimental protocol to couple a large variety of single molecules covalently onto an AFM tip is presented. At the same time the AFM tip is passivated to prevent unspecific interactions between the tip and the substrate, which is a prerequisite to study single molecules attached to the AFM tip. Analyses to determine the adhesion force, the adhesion length, and the free energy of these molecules on solid surfaces and bio-interfaces are shortly presented and external references for further reading are provided. Example molecules are the poly(amino acid) polytyrosine, the graft polymer PI-g-PS and the phospholipid POPE (1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanolamine). These molecules are desorbed from different surfaces like CH3-SAMs, hydrogen terminated diamond and supported lipid bilayers under various solvent conditions. Finally, the advantages of force spectroscopic single molecule experiments are discussed including means to decide if truly a single molecule has been studied in the experiment.
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Affiliation(s)
- Frank W S Stetter
- Physik-Department E22a, Technische Universität München; IMETUM, Technische Universität München
| | - Sandra Kienle
- Physik-Department E22a, Technische Universität München; IMETUM, Technische Universität München
| | - Stefanie Krysiak
- Physik-Department E22a, Technische Universität München; IMETUM, Technische Universität München
| | - Thorsten Hugel
- Physik-Department E22a, Technische Universität München; IMETUM, Technische Universität München;
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11
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Lee JE, Luo SC, Zhu B, Park JW, Yu HH. Nanoscale analysis of functionalized polythiophene surfaces: the effects of electropolymerization methods and thermal treatment. RSC Adv 2014. [DOI: 10.1039/c4ra10135a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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12
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Quantifying thiol-gold interactions towards the efficient strength control. Nat Commun 2014; 5:4348. [PMID: 25000336 DOI: 10.1038/ncomms5348] [Citation(s) in RCA: 392] [Impact Index Per Article: 39.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Accepted: 06/09/2014] [Indexed: 12/25/2022] Open
Abstract
The strength of the thiol-gold interactions provides the basis to fabricate robust self-assembled monolayers for diverse applications. Investigation on the stability of thiol-gold interactions has thus become a hot topic. Here we use atomic force microscopy to quantify the stability of individual thiol-gold contacts formed both by isolated single thiols and in self-assembled monolayers on gold surface. Our results show that the oxidized gold surface can enhance greatly the stability of gold-thiol contacts. In addition, the shift of binding modes from a coordinate bond to a covalent bond with the change in environmental pH and interaction time has been observed experimentally. Furthermore, isolated thiol-gold contact is found to be more stable than that in self-assembled monolayers. Our findings revealed mechanisms to control the strength of thiol-gold contacts and will help guide the design of thiol-gold contacts for a variety of practical applications.
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13
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Lee JE, Kwak JW, Park JW, Luo SC, Zhu B, Yu HH. Nanoscale Analysis of a Functionalized Polythiophene Surface by Adhesion Mapping. Anal Chem 2014; 86:6865-71. [DOI: 10.1021/ac500138x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jae-Eun Lee
- Department
of Chemistry, Pohang University of Science and Technology, San 31
Hyoja-dong, Pohang 790-784, Korea
| | - Ju-Won Kwak
- Department
of Chemistry, Pohang University of Science and Technology, San 31
Hyoja-dong, Pohang 790-784, Korea
| | - Joon Won Park
- Department
of Chemistry, Pohang University of Science and Technology, San 31
Hyoja-dong, Pohang 790-784, Korea
| | - Shyh-Chyang Luo
- Responsive Organic
Materials Laboratory, RIKEN 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Bo Zhu
- Responsive Organic
Materials Laboratory, RIKEN 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Hsiao-hua Yu
- Responsive Organic
Materials Laboratory, RIKEN 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Institute
of Chemistry, Academia Sinica, 128 Academic Road Sec. 2, Nankang, Taipei 115, Taiwan
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14
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Jobst MA, Schoeler C, Malinowska K, Nash MA. Investigating receptor-ligand systems of the cellulosome with AFM-based single-molecule force spectroscopy. J Vis Exp 2013:e50950. [PMID: 24378772 PMCID: PMC4110915 DOI: 10.3791/50950] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Cellulosomes are discrete multienzyme complexes used by a subset of anaerobic bacteria and fungi to digest lignocellulosic substrates. Assembly of the enzymes onto the noncatalytic scaffold protein is directed by interactions among a family of related receptor-ligand pairs comprising interacting cohesin and dockerin modules. The extremely strong binding between cohesin and dockerin modules results in dissociation constants in the low picomolar to nanomolar range, which may hamper accurate off-rate measurements with conventional bulk methods. Single-molecule force spectroscopy (SMFS) with the atomic force microscope measures the response of individual biomolecules to force, and in contrast to other single-molecule manipulation methods (i.e. optical tweezers), is optimal for studying high-affinity receptor-ligand interactions because of its ability to probe the high-force regime (>120 pN). Here we present our complete protocol for studying cellulosomal protein assemblies at the single-molecule level. Using a protein topology derived from the native cellulosome, we worked with enzyme-dockerin and carbohydrate binding module-cohesin (CBM-cohesin) fusion proteins, each with an accessible free thiol group at an engineered cysteine residue. We present our site-specific surface immobilization protocol, along with our measurement and data analysis procedure for obtaining detailed binding parameters for the high-affinity complex. We demonstrate how to quantify single subdomain unfolding forces, complex rupture forces, kinetic off-rates, and potential widths of the binding well. The successful application of these methods in characterizing the cohesin-dockerin interaction responsible for assembly of multidomain cellulolytic complexes is further described.
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Affiliation(s)
- Markus A Jobst
- Lehrstuhl für Angewandte Physik and Center for Nanoscience, Ludwig-Maximilians-Universität
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15
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Balzer BN, Gallei M, Sondergeld K, Schindler M, Müller-Buschbaum P, Rehahn M, Hugel T. Cohesion Mechanisms of Polystyrene-Based Thin Polymer Films. Macromolecules 2013. [DOI: 10.1021/ma401173y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bizan N. Balzer
- IMETUM
and Physik-Department, Technische Universität München, Boltzmannstr.
11, 85748 Garching, Germany
| | - Markus Gallei
- Ernst-Berl
Institute for Chemical Engineering and Macromolecular Science, Technische Universität Darmstadt, Petersenstraße 22, 64287 Darmstadt, Germany
| | - Katrin Sondergeld
- Ernst-Berl
Institute for Chemical Engineering and Macromolecular Science, Technische Universität Darmstadt, Petersenstraße 22, 64287 Darmstadt, Germany
| | - Markus Schindler
- Lehrstuhl
für Funktionelle Materialien, Physik-Department, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Peter Müller-Buschbaum
- Lehrstuhl
für Funktionelle Materialien, Physik-Department, Technische Universität München, James-Franck-Str. 1, 85748 Garching, Germany
| | - Matthias Rehahn
- Ernst-Berl
Institute for Chemical Engineering and Macromolecular Science, Technische Universität Darmstadt, Petersenstraße 22, 64287 Darmstadt, Germany
| | - Thorsten Hugel
- IMETUM
and Physik-Department, Technische Universität München, Boltzmannstr.
11, 85748 Garching, Germany
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16
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Balzer BN, Micciulla S, Dodoo S, Zerball M, Gallei M, Rehahn M, V Klitzing R, Hugel T. Adhesion property profiles of supported thin polymer films. ACS APPLIED MATERIALS & INTERFACES 2013; 5:6300-6306. [PMID: 23738613 DOI: 10.1021/am4013424] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Polymer coatings are frequently utilized to control and modify substrate properties. The performance of the coatings is often determined by the first polymer layers between the substrate and the bulk polymer material, which are termed interphase. Standard methods have failed to completely characterize this interphase, because its properties change significantly over a few nanometers. Here we determine the spatially resolved adhesion properties of the interphase in polyelectrolyte multilayers (PEMs) by desorbing a single polymer covalently bound to an atomic force microscope cantilever tip from PEMs with varying thickness. We show that the adhesion properties of the first few layers (up to three double layers) is dominated by the surface potential of the substrate, while thicker PEMs are controlled by cohesion in between the PEM polymers. For cohesion, the local film conformation is the crucial parameter. This finding is generalized by utilizing oligoelectrolyte multilayer (OEM) as coatings and both hydrophilic and hydrophobic polymers as polymeric force sensors.
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Affiliation(s)
- Bizan N Balzer
- IMETUM and Physik-Department, Technische Universität München, Garching, Germany
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17
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Kienle S, Pirzer T, Krysiak S, Geisler M, Hugel T. Measuring the interaction between ions, biopolymers and interfaces--one polymer at a time. Faraday Discuss 2013; 160:329-40; discussion 389-403. [PMID: 23795508 DOI: 10.1039/c2fd20069d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Atomic force microscopy (AFM) based single polymer force spectroscopy allows to detect the interaction (energy) between single polymers and interfaces in aqueous environment. We use this method to delineate the effect of ions, pH, co-solutes and temperature on the adhesion of biopolymers onto solid substrates.
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Affiliation(s)
- Sandra Kienle
- IMETUM, Physics Department, CeNS, Technische Universität München, 85748 Garching, Germany
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18
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Nash MA, Gaub HE. Single-molecule adhesion of a stimuli-responsive oligo(ethylene glycol) copolymer to gold. ACS NANO 2012; 6:10735-10742. [PMID: 23113802 DOI: 10.1021/nn303963m] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Adhesion of environmentally responsive polymers to biocompatible surfaces is an important issue that has been explored in several nanobiotechnology applications. Here, we prepared multi-responsive statistical copolymers of two oligo(ethylene glycol) methyl ether methacrylate macromonomers with differing ethylene glycol side chain lengths using RAFT polymerization. The lower critical solution temperature of the copolymers was characterized using visible light extinction, and the chemical composition and molecular weight were measured using NMR spectroscopy and size-exclusion chromatography, respectively. The characterization results demonstrated that the transition temperature could be controlled by varying the macromonomer feed ratios, and the molecular weight could be controlled by varying the amount of the RAFT chain transfer agent in the polymerization feed. Using AFM single-molecule force spectroscopy, we measured the adhesion characteristics of single copolymer molecules to a gold surface. We found that dehydration and collapse of the copolymer in a high ionic strength buffer resulted in dramatically reduced bridging length distributions that maintained their single-molecule bimodal character. In the collapsed state, the polymer exhibited a lower absolute desorption force while cooperativity effects were found to increase the desorption force per chain for multi-chain interactions. Our results confirmed that the polymer in a collapsed conformation exhibited a dramatically reduced volume occupancy above the gold surface. These results demonstrate at the single-molecule level how solvent-induced collapse of an environmentally responsive copolymer modulates surface adhesion forces and bridging length distributions in a controllable way.
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Affiliation(s)
- Michael A Nash
- Lehrstuhl für Angewandte Physik and Center for NanoScience, Ludwig-Maximilians-Universität, 80799 Munich, Germany.
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19
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Liu N, Zhang W. Feeling Inter- or Intramolecular Interactions with the Polymer Chain as Probe: Recent Progress in SMFS Studies on Macromolecular Interactions. Chemphyschem 2012; 13:2238-56. [DOI: 10.1002/cphc.201200154] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2012] [Indexed: 01/30/2023]
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20
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Thyparambil AA, Wei Y, Latour RA. Determination of peptide-surface adsorption free energy for material surfaces not conducive to SPR or QCM using AFM. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:5687-94. [PMID: 22397583 PMCID: PMC3319500 DOI: 10.1021/la300315r] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The interactions between peptides and proteins with material surfaces are of primary importance in many areas of biotechnology. While surface plasmon resonance spectroscopy (SPR) and quartz crystal microbalance (QCM) methods have proven to be very useful in measuring fundamental properties characterizing adsorption behavior, such as the free energy of adsorption for peptide-surface interactions, these methods are largely restricted to use for materials that can readily form nanoscale-thick films over the respective sensor surfaces. Many materials including most polymers, ceramics, and inorganic glasses, however, are not readily suitable for use with SPR or QCM methods. To overcome these limitations, we recently showed that desorption forces (F(des)) obtained using a standardized AFM method linearly correlate to standard-state adsorption free energy values (ΔG°(ads)) measured from SPR in phosphate buffered saline (PBS: phosphate buffered 140 mM NaCl, pH 7.4). This approach thus provides a means to determine ΔG°(ads) for peptide adsorption using AFM that can be applied to any flat material surface. In this present study, we investigated the F(des)-ΔG°(ads) correlation between AFM and SPR data in PBS for a much broader range of systems including eight different types of peptides on a set of eight different alkanethiol self-assembled monolayer (SAM) surfaces. The resulting correlation was then used to estimate ΔG°(ads) from F(des) determined by AFM for selected bulk polymer and glass/ceramic materials such as poly(methyl methacrylate) (PMMA), high-density polyethylene (HDPE), fused silica glass, and a quartz (100) surface. The results of these studies support our previous findings regarding the strong correlation between F(des) measured by AFM and ΔG°(ads) determined by SPR, and provides a means to estimate ΔG°(ads) for peptide adsorption on macroscopically thick samples of materials that are not conducive for use with SPR or QCM.
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Liu K, Song Y, Feng W, Liu N, Zhang W, Zhang X. Extracting a Single Polyethylene Oxide Chain from a Single Crystal by a Combination of Atomic Force Microscopy Imaging and Single-Molecule Force Spectroscopy: Toward the Investigation of Molecular Interactions in Their Condensed States. J Am Chem Soc 2011; 133:3226-9. [DOI: 10.1021/ja108022h] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Kai Liu
- Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
| | | | | | | | | | - Xi Zhang
- Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
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Abstract
The purpose of this critical review is to introduce the reader to an increasingly important class of phenomena: enormous changes in rates of simple chemical reactions within macromolecules as they are stretched by interactions with the environment. In these chemomechanical, or mechanochemical, phenomena the effect of the macromolecular environment can be visualized as a spring (harmonic or anharmonic) bridging and pulling apart a pair of atoms of the macromolecule. Being able to predict how the parameters of this spring affect the kinetics of the reactions occurring between the constrained atoms may create revolutionary opportunities for designing new reactions, molecules and materials that would capture large-scale deformations to drive useful chemistry or, conversely, that would propel autonomous micro- and nanomechanical devices by coupling them to the concerted motion of atoms that convert reactants into products. Although chemists have long studied and exploited coupling between molecular strain and reactivity in small molecules, a quantitative understanding of the relationship between large-scale (>50 nm) strain and localized reactivity presents unique conceptual and experimental challenges. Below we discuss both the phenomenology and the interpretive framework of chemomechanical phenomena (102 references).
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Affiliation(s)
- Zhen Huang
- Department of Chemistry, University of Illinois, Urbana, IL 61801, USA
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Geisler M, Xiao S, Puchner EM, Gräter F, Hugel T. Controlling the Structure of Proteins at Surfaces. J Am Chem Soc 2010; 132:17277-81. [DOI: 10.1021/ja107212z] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Michael Geisler
- IMETUM, Physics Department, CeNS and CIPSM, Technische Universität München, 85748 Garching, Germany, Key Laboratory for Computational Biology, MPG-CAS Partner Institute for Computational Biology, Chinese Academy of Sciences, 200031 Shanghai, China, Bioquant, Heidelberg University, 69120 Heidelberg, Germany, and Center for Nanoscience and Department of Physics, University of Munich, 80799 Munich, Germany
| | - Senbo Xiao
- IMETUM, Physics Department, CeNS and CIPSM, Technische Universität München, 85748 Garching, Germany, Key Laboratory for Computational Biology, MPG-CAS Partner Institute for Computational Biology, Chinese Academy of Sciences, 200031 Shanghai, China, Bioquant, Heidelberg University, 69120 Heidelberg, Germany, and Center for Nanoscience and Department of Physics, University of Munich, 80799 Munich, Germany
| | - Elias M. Puchner
- IMETUM, Physics Department, CeNS and CIPSM, Technische Universität München, 85748 Garching, Germany, Key Laboratory for Computational Biology, MPG-CAS Partner Institute for Computational Biology, Chinese Academy of Sciences, 200031 Shanghai, China, Bioquant, Heidelberg University, 69120 Heidelberg, Germany, and Center for Nanoscience and Department of Physics, University of Munich, 80799 Munich, Germany
| | - Frauke Gräter
- IMETUM, Physics Department, CeNS and CIPSM, Technische Universität München, 85748 Garching, Germany, Key Laboratory for Computational Biology, MPG-CAS Partner Institute for Computational Biology, Chinese Academy of Sciences, 200031 Shanghai, China, Bioquant, Heidelberg University, 69120 Heidelberg, Germany, and Center for Nanoscience and Department of Physics, University of Munich, 80799 Munich, Germany
| | - Thorsten Hugel
- IMETUM, Physics Department, CeNS and CIPSM, Technische Universität München, 85748 Garching, Germany, Key Laboratory for Computational Biology, MPG-CAS Partner Institute for Computational Biology, Chinese Academy of Sciences, 200031 Shanghai, China, Bioquant, Heidelberg University, 69120 Heidelberg, Germany, and Center for Nanoscience and Department of Physics, University of Munich, 80799 Munich, Germany
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