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Chakkarapani SK, Lee S, Kang SH. Ultrasensitive Capsaicin Sensor Based on Endogenous Single‐Molecule Fluorophore Enhancement and Quenching Interface on Gold Nanoislands. B KOREAN CHEM SOC 2021. [DOI: 10.1002/bkcs.12369] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Suresh Kumar Chakkarapani
- Department of Applied Chemistry and Institute of Natural Sciences Kyung Hee University Yongin‐si 17104 South Korea
| | - Seungah Lee
- Department of Applied Chemistry and Institute of Natural Sciences Kyung Hee University Yongin‐si 17104 South Korea
| | - Seong Ho Kang
- Department of Applied Chemistry and Institute of Natural Sciences Kyung Hee University Yongin‐si 17104 South Korea
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2
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Oheim M, Salomon A, Weissman A, Brunstein M, Becherer U. Calibrating Evanescent-Wave Penetration Depths for Biological TIRF Microscopy. Biophys J 2019; 117:795-809. [PMID: 31439287 DOI: 10.1016/j.bpj.2019.07.048] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Revised: 07/08/2019] [Accepted: 07/23/2019] [Indexed: 11/28/2022] Open
Abstract
Roughly half of a cell's proteins are located at or near the plasma membrane. In this restricted space, the cell senses its environment, signals to its neighbors, and exchanges cargo through exo- and endocytotic mechanisms. Ligands bind to receptors, ions flow across channel pores, and transmitters and metabolites are transported against concentration gradients. Receptors, ion channels, pumps, and transporters are the molecular substrates of these biological processes, and they constitute important targets for drug discovery. Total internal reflection fluorescence (TIRF) microscopy suppresses the background from the cell's deeper layers and provides contrast for selectively imaging dynamic processes near the basal membrane of live cells. The optical sectioning of TIRF is based on the excitation confinement of the evanescent wave generated at the glass/cell interface. How deep the excitation light actually penetrates the sample is difficult to know, making the quantitative interpretation of TIRF data problematic. Nevertheless, many applications like superresolution microscopy, colocalization, Förster resonance energy transfer, near-membrane fluorescence recovery after photobleaching, uncaging or photoactivation/switching as well as single-particle tracking require the quantitative interpretation of evanescent-wave-excited images. Here, we review existing techniques for characterizing evanescent fields, and we provide a roadmap for comparing TIRF data across images, experiments, and laboratories.
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Affiliation(s)
- Martin Oheim
- Université de Paris, CNRS, Saints-Pères Paris Institute for the Neurosciences (SPPIN), Paris, France.
| | - Adi Salomon
- Department of Chemistry, Institute of Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat Gan, Israel
| | - Adam Weissman
- Department of Chemistry, Institute of Nanotechnology and Advanced Materials (BINA), Bar-Ilan University, Ramat Gan, Israel
| | - Maia Brunstein
- Université de Paris, CNRS, Saints-Pères Paris Institute for the Neurosciences (SPPIN), Paris, France; Chaire d'Excellence Junior, Université Sorbonne Paris Cité, Paris, France
| | - Ute Becherer
- Saarland University, Department of Physiology, CIPMM, Homburg/Saar, Germany
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3
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Weger L, Weidmann M, Ali W, Hildebrandt M, Gutmann JS, Hoffmann-Jacobsen K. Polymer Diffusion in the Interphase Between Surface and Solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:7021-7027. [PMID: 29786433 DOI: 10.1021/acs.langmuir.8b00660] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Total internal reflection fluorescence correlation spectroscopy (TIR-FCS) is applied to study the self-diffusion of poly(ethylene glycol) solutions in the presence of weakly attractive interfaces. Glass coverslips modified with aminopropyl- and propyl-terminated silanes are used to study the influence of solid surfaces on polymer diffusion. A model of three phases of polymer diffusion allows to describe the experimental fluorescence autocorrelation functions. Besides the two-dimensional diffusion of adsorbed polymer on the substrate and three-dimensional free diffusion in bulk solution, a third diffusion time scale is observed with intermediate diffusion times. This retarded three-dimensional diffusion in the solution is assigned to the long-range effects of solid surfaces on diffusional dynamics of polymers. The respective diffusion constants show Rouse scaling ( D ∼ N-1), indicating a screening of hydrodynamic interactions by the presence of the surface. Hence, the presented TIR-FCS method proves to be a valuable tool to investigate the effect of surfaces on polymer diffusion beyond the first adsorbed polymer layer on the 100 nm length scale.
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Affiliation(s)
- Lukas Weger
- Department of Chemistry , Niederrhein University of Applied Sciences , Adlerstr. 32 , 47798 Krefeld , Germany
| | - Monika Weidmann
- Department of Chemistry , Niederrhein University of Applied Sciences , Adlerstr. 32 , 47798 Krefeld , Germany
| | | | | | | | - Kerstin Hoffmann-Jacobsen
- Department of Chemistry , Niederrhein University of Applied Sciences , Adlerstr. 32 , 47798 Krefeld , Germany
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Weger L, Hoffmann-Jacobsen K. A total internal reflection-fluorescence correlation spectroscopy setup with pulsed diode laser excitation. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2017; 88:093102. [PMID: 28964231 DOI: 10.1063/1.4986235] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Accepted: 08/22/2017] [Indexed: 06/07/2023]
Abstract
Fluorescence correlation spectroscopy (FCS) measures fluctuations in a (sub-)femtoliter volume to analyze the diffusive behavior of fluorescent particles. This highly sensitive method has proven to be useful for the analysis of dynamic biological systems as well as in chemistry, physics, and material sciences. It is routinely performed with commercial fluorescence microscopes, which provide a confined observation volume by the confocal technique. The evanescent wave of total internal reflectance (TIR) is used in home-built systems to permit a surface sensitive FCS analysis. We present a combined confocal and TIR-FCS setup which uses economic low-power pulsed diode lasers for excitation. Excitation and detection are coupled to time-correlated photon counting hardware. This allows simultaneous fluorescence lifetime and FCS measurements in a surface-sensitive mode. Moreover, the setup supports fluorescence lifetime correlation spectroscopy at surfaces. The excitation can be easily switched between TIR and epi-illumination to compare the surface properties with those in liquid bulk. The capabilities of the presented setup are demonstrated by measuring the diffusion coefficients of a free dye molecule, a labeled polyethylene glycol, and a fluorescent nanoparticle in confocal as well as in TIR-FCS.
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Affiliation(s)
- Lukas Weger
- Department of Chemistry, Niederrhein University of Applied Sciences, Adlerstr. 32, 47798 Krefeld, Germany
| | - Kerstin Hoffmann-Jacobsen
- Department of Chemistry, Niederrhein University of Applied Sciences, Adlerstr. 32, 47798 Krefeld, Germany
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5
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Otosu T, Yamaguchi S. Communication: Development of standing evanescent-wave fluorescence correlation spectroscopy and its application to the lateral diffusion of lipids in a supported lipid bilayer. J Chem Phys 2017; 147:041101. [DOI: 10.1063/1.4985871] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Takuhiro Otosu
- Department of Applied Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura, Saitama 338-8570, Japan
| | - Shoichi Yamaguchi
- Department of Applied Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura, Saitama 338-8570, Japan
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6
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Li J, Dong C, Ren J. Strategies to reduce detection volume of fluorescence correlation spectroscopy (FCS) to realize physiological concentration measurements. Trends Analyt Chem 2017. [DOI: 10.1016/j.trac.2017.02.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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7
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Mantil E, Crippin T, Ianoul A, Avis TJ. Experimental Parameters Leading to Optimal Bilayers for Total Internal Reflection Fluorescence Microscopy Visualization. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2017; 23:97-112. [PMID: 28228172 DOI: 10.1017/s1431927617000083] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Supported lipid bilayer systems were evaluated following various experimental procedures in an effort to determine their appropriateness for visualization using total internal reflection fluorescence (TIRF) microscopy. The incorporation and distribution of Texas Red® 1,2-dihexadecanoyl-sn-glycero-3-phosphoethanolamine (TR-DHPE) was studied when incorporated into bilayers of variable lipid composition using different forms of mechanical shearing. Results showed that 0.8 mol% TR-DHPE provides the most optimum TIRF images. At this concentration, a sufficient level of photostability can be achieved without an undesirable increase in TR-DHPE aggregates caused by excess probe molecules. Solutions composed of a 3:1 molar ratio of DOPC:DPPC with 0.8 mol% TR-DHPE produce bilayers that consistently display clear, distinct, rounded domains, whereas other lipid compositions did not. This optimum phase separation appears to be influenced by an increase in mechanical shearing during the vesicle formation process, when the lipid solutions were exposed to sonication and extrusion processes. The combination of a sonication and extrusion process also helped with eliminating the presence of TR-DHPE aggregates within the model membranes. It was also shown that bilayers formed on conditioned glass, placed on a slide, produced more highly detailed bilayers in which distinct lipid phase separation could be optimally visualized using TIRF microscopy.
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Affiliation(s)
- Elisabeth Mantil
- 1Department of Chemistry,Carleton University,1125 Colonel By Drive,Ottawa,ON K1S 5B6,Canada
| | - Trinda Crippin
- 2Department of Biology,Carleton University,1125 Colonel By Drive,Ottawa,ON K1S 5B6,Canada
| | - Anatoli Ianoul
- 1Department of Chemistry,Carleton University,1125 Colonel By Drive,Ottawa,ON K1S 5B6,Canada
| | - Tyler J Avis
- 1Department of Chemistry,Carleton University,1125 Colonel By Drive,Ottawa,ON K1S 5B6,Canada
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8
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Nasir W, Bally M, Zhdanov VP, Larson G, Höök F. Interaction of Virus-Like Particles with Vesicles Containing Glycolipids: Kinetics of Detachment. J Phys Chem B 2015; 119:11466-72. [PMID: 26260011 DOI: 10.1021/acs.jpcb.5b04160] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Many viruses interact with their host cells via glycosphingolipids (GSLs) and/or glycoproteins present on the outer cell membrane. This highly specific interaction includes virion attachment and detachment. The residence time determined by the detachment is particularly interesting, since it is directly related to internalization and infection as well as to virion egress and spreading. In an attempt to deepen the understanding of virion detachment kinetics, we have used total internal reflection fluorescence (TIRF) microscopy to probe the interaction between individual fluorescently labeled GSL-containing lipid vesicles and surface-bound virus-like particles (VLPs) of a norovirus genotype II.4 strain. The distribution of the VLP-vesicle residence time was investigated for seven naturally occurring GSLs, all of which are candidates for the not yet identified receptor(s) mediating norovirus entry into host cells. As expected for interactions involving multiple GSL binding sites at a viral capsid, the detachment kinetics displayed features typical for a broad activation-energy distribution for all GSLs. Detailed inspection of these distributions revealed significant differences among the different GSLs. The results are discussed in terms of strength of the interaction, vesicle size, as well as spatial distribution and clustering of GSLs in the vesicle membrane.
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Affiliation(s)
- Waqas Nasir
- Department of Clinical Chemistry and Transfusion Medicine, Sahlgrenska Academy, University of Gothenburg , Gothenburg, Sweden
| | - Marta Bally
- Department of Applied Physics, Chalmers University of Technology , SE-412 96 Gothenburg, Sweden.,Institut Curie, Centre de Recherche, CNRS, UMR 168, Physico-Chimie Curie, F-75248 Paris, France
| | - Vladimir P Zhdanov
- Department of Applied Physics, Chalmers University of Technology , SE-412 96 Gothenburg, Sweden.,Boreskov Institute of Catalysis, Russian Academy of Sciences , Novosibirsk 630090, Russia
| | - Göran Larson
- Department of Clinical Chemistry and Transfusion Medicine, Sahlgrenska Academy, University of Gothenburg , Gothenburg, Sweden
| | - Fredrik Höök
- Department of Applied Physics, Chalmers University of Technology , SE-412 96 Gothenburg, Sweden
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Peel MJ, Cross SJ, Birkholz O, Aladağ A, Piehler J, Peel S. Rupture of Stochastically Occurring Vesicle Clusters Limits Bilayer Formation on Alkane-PEG-Type Supports: Uncoupling Clustering from Surface Coverage. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:8830-40. [PMID: 26176185 DOI: 10.1021/acs.langmuir.5b00925] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Polymer-supported bilayers (PSBs) are a recognized tool for drug discovery through function-interaction analysis of membrane proteins. While silica-supported bilayers (SSBs) spontaneously form from surface-adsorbed vesicles, successful PSB formation via a similar method has thus far been limited by an insufficient understanding of the underlying vesicle-remodelling processes. Here, we generated a polymer support through the incubation of poly-L-lysine conjugated to alkyl-chain-terminated poly(ethylene)glycol on silica. This polymer-coated silica substrate yielded efficient vesicle adsorption and spontaneous bilayer formation, thereby providing a rare opportunity to address the mechanism of PSB formation and compare it to that of SSB. The combined use of super-resolution imaging, kinetics, and simulations indicates that the rupture of stochastically formed vesicle clusters is the rate-limiting step, which is an order of magnitude higher for silica than for polymer-coated silica. This was confirmed by directly demonstrating increased rupture rates for surface adsorbed multivesicle assemblies formed by vesicle cross-linking in solution. On the basis of this key insight we surmised that a low propensity of cluster rupture can be compensated for by an increase in the number density of clusters: the deposition of a mixture of oppositely charged vesicles resulted in bilayer formation on another alkane-PEG type of interface, which despite efficient vesicle adsorption otherwise fails to support spontaneous bilayer formation. This potentially provides a universal strategy for promoting bilayer formation on resistant surfaces without resorting to modifying the surface itself. Therefore, multivesicle assemblies with tailored geometries not only could facilitate bilayer formation on polymers with interesting functional properties but also could instigate the exploration of vesicle architecture for other processes involving vesicle remodelling such as drug delivery.
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Affiliation(s)
| | | | - Oliver Birkholz
- §Department of Biology, University of Osnabrück, Barbarastrasse 11, 49076 Osnabrück, Germany
| | | | - Jacob Piehler
- §Department of Biology, University of Osnabrück, Barbarastrasse 11, 49076 Osnabrück, Germany
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11
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Woods DA, Bain CD. Total internal reflection spectroscopy for studying soft matter. SOFT MATTER 2014; 10:1071-1096. [PMID: 24651911 DOI: 10.1039/c3sm52817k] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Total internal reflection (TIR) spectroscopy is a widely used technique to study soft matter at interfaces. This tutorial review aims to provide researchers with an overview of the principles, experimental design and applications of TIR spectroscopy to enable them to understand how this class of techniques might be used in their research. It also highlights limitations and pitfalls of TIR techniques, which will assist readers in critically analysing the literature. Techniques covered include attenuated total reflection infrared spectroscopy (ATR-IR), TIR fluorescence, TIR Raman scattering and cavity-enhanced techniques. Other related techniques are briefly described.
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Affiliation(s)
- David A Woods
- Department of Chemistry, Durham University, South Road, Durham, UKDH1 3LE.
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12
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13
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Kett PJN, Casford MTL, Davies PB. Sum Frequency Generation Vibrational Spectroscopy of Cholesterol in Hybrid Bilayer Membranes. J Phys Chem B 2013; 117:6455-65. [DOI: 10.1021/jp403584j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Peter J. N. Kett
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Michael T. L. Casford
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Paul B. Davies
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
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Waichman S, Roder F, Richter CP, Birkholz O, Piehler J. Diffusion and interaction dynamics of individual membrane protein complexes confined in micropatterned polymer-supported membranes. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2013; 9:570-577. [PMID: 23109503 DOI: 10.1002/smll.201201530] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2012] [Revised: 09/12/2012] [Indexed: 06/01/2023]
Abstract
Micropatterned polymer-supported membranes (PSM) are established as a tool for confining the diffusion of transmembrane proteins for single molecule studies. To this end, a photochemical surface modification with hydrophobic tethers on a PEG polymer brush is implemented for capturing of lipid vesicles and subsequent fusion. Formation of contiguous membranes within micropatterns is confirmed by scanning force microscopy, fluorescence recovery after photobleaching (FRAP), and super-resolved single-molecule tracking and localization microscopy. Free diffusion of transmembrane proteins reconstituted into micropatterned PSM is demonstrated by FRAP and by single-molecule tracking. By exploiting the confinement of diffusion within micropatterned PSM, the diffusion and interaction dynamics of individual transmembrane receptors are quantitatively resolved.
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Affiliation(s)
- Sharon Waichman
- Department of Biology, University of Osnabrück, Osnabrück, Germany
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15
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Koynov K, Butt HJ. Fluorescence correlation spectroscopy in colloid and interface science. Curr Opin Colloid Interface Sci 2012. [DOI: 10.1016/j.cocis.2012.09.003] [Citation(s) in RCA: 99] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Gözen I, Jesorka A. Instrumental Methods to Characterize Molecular Phospholipid Films on Solid Supports. Anal Chem 2012; 84:822-38. [DOI: 10.1021/ac203126f] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Irep Gözen
- Department of Chemical and Biological
Engineering, Chalmers University of Technology, Kemivägen 10, 41296 Göteborg, Sweden
| | - Aldo Jesorka
- Department of Chemical and Biological
Engineering, Chalmers University of Technology, Kemivägen 10, 41296 Göteborg, Sweden
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Zheng D, Kaldaras L, Lu HP. Total internal reflection fluorescence microscopy imaging-guided confocal single-molecule fluorescence spectroscopy. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2012; 83:013110. [PMID: 22299932 PMCID: PMC3277604 DOI: 10.1063/1.3677334] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Accepted: 12/27/2011] [Indexed: 05/31/2023]
Abstract
We have developed an integrated spectroscopy system combining total internal reflection fluorescence microscopy imaging with confocal single-molecule fluorescence spectroscopy for two-dimensional interfaces. This spectroscopy approach is capable of both multiple molecules simultaneously sampling and in situ confocal fluorescence dynamics analyses of individual molecules of interest. We have demonstrated the calibration with fluorescent microspheres, and carried out single-molecule spectroscopy measurements. This integrated single-molecule spectroscopy is powerful in studies of single molecule dynamics at interfaces of biological and chemical systems.
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Affiliation(s)
- Desheng Zheng
- Department of Chemistry, Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, USA
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Roder F, Waichman S, Paterok D, Schubert R, Richter C, Liedberg B, Piehler J. Reconstitution of Membrane Proteins into Polymer-Supported Membranes for Probing Diffusion and Interactions by Single Molecule Techniques. Anal Chem 2011; 83:6792-9. [DOI: 10.1021/ac201294v] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
| | - Sharon Waichman
- Division of Biophysics, University of Osnabrück, Germany
- Division of Molecular Physics, Linköping University, Sweden
| | - Dirk Paterok
- Division of Biophysics, University of Osnabrück, Germany
| | - Robin Schubert
- Division of Biophysics, University of Osnabrück, Germany
| | | | - Bo Liedberg
- Division of Molecular Physics, Linköping University, Sweden
| | - Jacob Piehler
- Division of Biophysics, University of Osnabrück, Germany
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Yordanov S, Best A, Weisshart K, Koynov K. Note: An easy way to enable total internal reflection-fluorescence correlation spectroscopy (TIR-FCS) by combining commercial devices for FCS and TIR microscopy. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2011; 82:036105. [PMID: 21456807 DOI: 10.1063/1.3557412] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Total internal reflection-fluorescence correlation spectroscopy (TIR-FCS) is a powerful method for studying dynamic processes at liquid-solid interfaces that may have numerous applications in biology, physics, and material science. Despite of its power and versatility, however, the use of TIR-FCS is still rather limited. The main reason for this is the need of a complex, in-house constructed optical setup whose assembly and adjustment is a quite difficult task. Clearly, the availability of ready to use, commercial TIR-FCS setups will strongly boost the application of this important method in many research areas. In this note we show that although such setups are still not available in the market, a proper combination of commercial devices for confocal fluorescence correlation spectroscopy and for total internal reflection microscopy may enable TIR-FCS in a way that do not require any special optical alignments. Furthermore, we demonstrate the capabilities of the setup by measuring the diffusion coefficient of single dye molecule and quantum dots in the very proximity of a water-glass interface.
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Affiliation(s)
- Stoyan Yordanov
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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Thompson NL, Navaratnarajah P, Wang X. Measuring surface binding thermodynamics and kinetics by using total internal reflection with fluorescence correlation spectroscopy: practical considerations. J Phys Chem B 2010; 115:120-31. [PMID: 21166379 DOI: 10.1021/jp1069708] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The combination of total internal reflection illumination and fluorescence correlation spectroscopy (TIR-FCS) is an emerging method useful for, among a number of things, measuring the thermodynamic and kinetic parameters describing the reversible association of fluorescently labeled ligands in solution with immobilized, nonfluorescent surface binding sites. However, there are many parameters (both instrumental and intrinsic to the interaction of interest) that determine the nature of the acquired fluorescence fluctuation autocorrelation functions. In this work, we define criteria necessary for successful measurements and then systematically explore the parameter space to define conditions that meet the criteria. The work is intended to serve as a guide for experimental design, in other words, to provide a methodology to identify experimental conditions that will yield reliable values of the thermodynamic and kinetic parameters for a given interaction.
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Affiliation(s)
- Nancy L Thompson
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.
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Electrostatic interactions of fluorescent molecules with dielectric interfaces studied by total internal reflection fluorescence correlation spectroscopy. Int J Mol Sci 2010; 11:386-406. [PMID: 20386645 PMCID: PMC2852845 DOI: 10.3390/ijms11020386] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2009] [Revised: 01/17/2010] [Accepted: 01/21/2010] [Indexed: 01/24/2023] Open
Abstract
Electrostatic interactions between dielectric surfaces and different fluorophores used in ultrasensitive fluorescence microscopy are investigated using objective-based Total Internal Reflection Fluorescence Correlation Spectroscopy (TIR-FCS). The interfacial dynamics of cationic rhodamine 123 and rhodamine 6G, anionic/dianionic fluorescein, zwitterionic rhodamine 110 and neutral ATTO 488 are monitored at various ionic strengths at physiological pH. As analyzed by means of the amplitude and time-evolution of the autocorrelation function, the fluorescent molecules experience electrostatic attraction or repulsion at the glass surface depending on their charges. Influences of the electrostatic interactions are also monitored through the triplet-state population and triplet relaxation time, including the amount of detected fluorescence or the count-rate-per-molecule parameter. These TIR-FCS results provide an increased understanding of how fluorophores are influenced by the microenvironment of a glass surface, and show a promising approach for characterizing electrostatic interactions at interfaces.
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