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König B, Pezzotti S, Ramos S, Schwaab G, Havenith M. Real-time measure of solvation free energy changes upon liquid-liquid phase separation of α-elastin. Biophys J 2024; 123:1367-1375. [PMID: 37515326 PMCID: PMC11163292 DOI: 10.1016/j.bpj.2023.07.023] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 06/16/2023] [Accepted: 07/26/2023] [Indexed: 07/30/2023] Open
Abstract
Biological condensates are known to retain a large fraction of water to remain in a liquid and reversible state. Local solvation contributions from water hydrating hydrophilic and hydrophobic protein surfaces were proposed to play a prominent role for the formation of condensates through liquid-liquid phase separation (LLPS). However, although the total free energy is accessible by calorimetry, the partial solvent contributions to the free energy changes upon LLPS remained experimentally inaccessible so far. Here, we show that the recently developed THz calorimetry approach allows to quantify local hydration enthalpy and entropy changes upon LLPS of α-elastin in real time, directly from experimental THz spectroscopy data. We find that hydrophobic solvation dominates the entropic solvation term, whereas hydrophilic solvation mainly contributes to the enthalpy. Both terms are in the order of hundreds of kJ/mol, which is more than one order of magnitude larger than the total free energy changes at play during LLPS. However, since we show that entropy/enthalpy mostly compensates, a small entropy/enthalpy imbalance is sufficient to tune LLPS. Theoretically, a balance was proposed before. Here we present experimental evidence based on our spectroscopic approach. We finally show that LLPS can be steered by inducing small changes of solvation entropy/enthalpy compensation via concentration or temperature in α-elastin.
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Affiliation(s)
- Benedikt König
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, Bochum, Germany
| | - Simone Pezzotti
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, Bochum, Germany
| | - Sashary Ramos
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, Bochum, Germany
| | - Gerhard Schwaab
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, Bochum, Germany
| | - Martina Havenith
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, Bochum, Germany.
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2
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Bajrami D, Sarquis A, Ladero VM, Fernández M, Mizaikoff B. Rapid discrimination of Lentilactobacillus parabuchneri biofilms via in situ infrared spectroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 304:123391. [PMID: 37714102 DOI: 10.1016/j.saa.2023.123391] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 09/01/2023] [Accepted: 09/08/2023] [Indexed: 09/17/2023]
Abstract
Microbial contamination in food industry is a source of foodborne illnesses and biofilm-related diseases. In particular, biogenic amines (BAs) accumulated in fermented foods via lactic acid bacterial activity exert toxic effects on human health. Among these, biofilms of histamine-producer Lentilactobacillus parabuchneri strains adherent at food processing equipment surfaces can cause food spoilage and poisoning. Understanding the chain of contamination is closely related to elucidating molecular mechanisms of biofilm formation. In the present study, an innovative approach using integrated chemical sensing technologies is demonstrated to fundamentally understand the temporal behavior of biofilms at the molecular level by combining mid-infrared (MIR) spectroscopy and fluorescence sensing strategies. Using these concepts, the biofilm forming capacity of six cheese-isolated L. parabuchneri strains (IPLA 11151, 11150, 11129, 11125, 11122 and 11117) was examined. The cut-off values for the biofilm production ability of each strain were quantified using crystal violet (CV) assays. Real-time infrared attenuated total reflection spectroscopy (IR-ATR) combined with fluorescence quenching oxygen sensing provides insight into distinct molecular mechanisms for each strain. IR spectra showed significant changes in characteristic bands of amides, lactate, nucleic acids, and extracellular polymeric substances (i.e., lipopolysaccharides, phospholipids, phosphodiester, peptidoglycan, etc.), which are major contributors to biofilm maturation involved in the initial adhesion processes. Chemometric methods including principal component analysis and partial least square-discriminant analysis facilitated the rapid determination and classification of cheese isolated L. parabuchneri strains unambiguously differentiating the IR signatures based on their ability to produce biofilm. All biofilms were morphologically characterized by confocal laser scanning microscopy on relevant industrial equipment surfaces. In summary, this innovative approach combining MIR spectroscopy with luminescence sensing enables real-time insight into the molecular composition and formation of L. parabuchneri biofilms.
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Affiliation(s)
- Diellza Bajrami
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Agustina Sarquis
- Dairy Research Institute (IPLA-CSIC), Paseo Rio Linares s/n, 33300 Villaviciosa, Spain
| | - Victor M Ladero
- Dairy Research Institute (IPLA-CSIC), Paseo Rio Linares s/n, 33300 Villaviciosa, Spain; Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), 33011 Oviedo, Spain
| | - María Fernández
- Dairy Research Institute (IPLA-CSIC), Paseo Rio Linares s/n, 33300 Villaviciosa, Spain; Instituto de Investigación Sanitaria del Principado de Asturias (ISPA), 33011 Oviedo, Spain.
| | - Boris Mizaikoff
- Institute of Analytical and Bioanalytical Chemistry, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany; Hahn-Schickard, Sedanstrasse 14, 89077 Ulm, Germany.
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3
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Tseng C, Pennathur AK, Blauth D, Salazar N, Dawlaty JM. Direct Determination of Plasmon Enhancement Factor and Penetration Depths in Surface Enhanced IR Absorption Spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:3179-3184. [PMID: 36812524 DOI: 10.1021/acs.langmuir.2c02254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Surface Enhanced Infrared Absorption Spectroscopy (SEIRAS) is a powerful tool for studying a wide range of surface and electrochemical phenomena. For most electrochemical experiments the evanescent field of an IR beam partially penetrates through a thin metal electrode deposited on top of an attenuated total reflection (ATR) crystal to interact with molecules of interest. Despite its success, a major problem that complicates quantitative interpretation of the spectra from this method is the ambiguity of the enhancement factor due to plasmon effects in metals. We developed a systematic method for measuring this, which relies upon independent determination of surface coverage by Coulometry of a surface-bound redox-active species. Following that, we measure the SEIRAS spectrum of the surface bound species, and from the knowledge of surface coverage, retrieve the effective molar absorptivity, εSEIRAS. Comparing this to the independently determined bulk molar absorptivity leads us to the enhancement factor f = εSEIRAS/εbulk. We report enhancement factors in excess of 1000 for the C-H stretches of surface bound ferrocene molecules. We additionally developed a methodical approach to measure the penetration depth of the evanescent field from the metal electrode into a thin film. Such systematic measure of the enhancement factor and penetration depth will help SEIRAS advance from a qualitative to a more quantitative method.
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Affiliation(s)
- Cindy Tseng
- Department of Chemistry, University of Southern California, California, Los Angeles 90089, United States
| | - Anuj K Pennathur
- Department of Chemistry, University of Southern California, California, Los Angeles 90089, United States
| | - Drew Blauth
- Department of Chemistry, Lewis & Clark College, Portland, Oregon 97219, United States
| | - Noemi Salazar
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Jahan M Dawlaty
- Department of Chemistry, University of Southern California, California, Los Angeles 90089, United States
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4
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Pezzotti S, König B, Ramos S, Schwaab G, Havenith M. Liquid-Liquid Phase Separation? Ask the Water! J Phys Chem Lett 2023; 14:1556-1563. [PMID: 36745512 DOI: 10.1021/acs.jpclett.2c02697] [Citation(s) in RCA: 22] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Water is more than an inert spectator during liquid-liquid phase separation (LLPS), the reversible compartmentalization of protein solutions into a protein-rich and a dilute phase. We show that LLPS is driven by changes in hydration entropy and enthalpy. Tuning LLPS by adjusting experimental parameters, e.g., addition of co-solutes, is a major goal for biological and medical applications. This requires a general model to quantify thermodynamic driving forces. Here, we develop such a model based on the measured amplitudes of characteristic THz-features of two hydration populations: "Cavity-wrap" water hydrating hydrophobic patches is released during LLPS leading to an increase in entropy. "Bound" water hydrating hydrophilic patches is retained since it is enthalpically favorable. We introduce a THz-phase diagram mapping these spectroscopic/thermodynamic changes. This provides not only a precise understanding of hydrophobic and hydrophilic hydration driving forces as a function of temperature and concentration but also a rational means to tune LLPS.
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Affiliation(s)
- Simone Pezzotti
- Department of Physical Chemistry II, Ruhr University Bochum, 44801Bochum, Germany
| | - Benedikt König
- Department of Physical Chemistry II, Ruhr University Bochum, 44801Bochum, Germany
| | - Sashary Ramos
- Department of Physical Chemistry II, Ruhr University Bochum, 44801Bochum, Germany
| | - Gerhard Schwaab
- Department of Physical Chemistry II, Ruhr University Bochum, 44801Bochum, Germany
| | - Martina Havenith
- Department of Physical Chemistry II, Ruhr University Bochum, 44801Bochum, Germany
- Department of Physics, Technische Universität Dortmund, 44227Dortmund, Germany
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5
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Busch C, Nagy B, Stöcklin A, Gutfreund P, Dahint R, Ederth T. A mobile setup for simultaneous and in situ neutron reflectivity, infrared spectroscopy, and ellipsometry studies. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:114102. [PMID: 36461462 DOI: 10.1063/5.0118329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Accepted: 10/08/2022] [Indexed: 06/17/2023]
Abstract
Neutron reflectivity at the solid/liquid interface offers unique opportunities for resolving the structure-function relationships of interfacial layers in soft matter science. It is a non-destructive technique for detailed analysis of layered structures on molecular length scales, providing thickness, density, roughness, and composition of individual layers or components of adsorbed films. However, there are also some well-known limitations of this method, such as the lack of chemical information, the difficulties in determining large layer thicknesses, and the limited time resolution. We have addressed these shortcomings by designing and implementing a portable sample environment for in situ characterization at neutron reflectometry beamlines, integrating infrared spectroscopy under attenuated total reflection for determination of molecular entities and their conformation, and spectroscopic ellipsometry for rapid and independent measurement of layer thicknesses and refractive indices. The utility of this combined setup is demonstrated by two projects investigating (a) pH-dependent swelling of polyelectrolyte layers and (b) the impact of nanoparticles on lipid membranes to identify potential mechanisms of nanotoxicity.
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Affiliation(s)
- Christian Busch
- Applied Physical Chemistry, Institute for Physical Chemistry, Heidelberg University, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
| | - Béla Nagy
- Division of Biophysics and Bioengineering, Department of Physics, Chemistry and Biology (IFM), Linköping University, 581 83 Linköping, Sweden
| | - Andreas Stöcklin
- Applied Physical Chemistry, Institute for Physical Chemistry, Heidelberg University, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
| | - Philipp Gutfreund
- Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France
| | - Reiner Dahint
- Applied Physical Chemistry, Institute for Physical Chemistry, Heidelberg University, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
| | - Thomas Ederth
- Division of Biophysics and Bioengineering, Department of Physics, Chemistry and Biology (IFM), Linköping University, 581 83 Linköping, Sweden
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6
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Ly TQ, Yang F, Baldelli S. In situ quantitative study of the phase transition in surfactant adsorption layers at the silica-water interface using total internal reflection Raman spectroscopy. Phys Chem Chem Phys 2021; 23:21701-21713. [PMID: 34581333 DOI: 10.1039/d1cp02645c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Dimethyldodecylamine N-oxide (DDAO), a unique type of surfactant, shows high surface activity with two distinct energy states at the buried hydrophilic silica/aqueous solution interface studied by total internal reflection (TIR) Raman spectroscopy combined with ratiometric and kinetic analysis. Different from other types of surfactant, i.e., ionic and nonionic, the adsorption of DDAO demonstrates a specific critical surface aggregation concentration (csac) at 0.15 mM gives a complete surface coverage of 6.6 ± 0.3 μmol m-2, much lower than the bulk critical micellization concentration (cmc) at the same conditions (csac ≈ 0.072 cmc). A phase transition of adsorbed layers from liquid crystalline as the intermediate state to the disordered liquid phase is spectroscopically and energetically analyzed. The adsorption of DDAO on silica surfaces is described quantitatively in a potential energy curve.
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Affiliation(s)
- Thong Q Ly
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA.
| | - Fangyuan Yang
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA.
| | - Steven Baldelli
- Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA.
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7
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Sit I, Wu H, Grassian VH. Environmental Aspects of Oxide Nanoparticles: Probing Oxide Nanoparticle Surface Processes Under Different Environmental Conditions. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2021; 14:489-514. [PMID: 33940931 DOI: 10.1146/annurev-anchem-091420-092928] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Surface chemistry affects the physiochemical properties of nanoparticles in a variety of ways. Therefore, there is great interest in understanding how nanoparticle surfaces evolve under different environmental conditions of pH and temperature. Here, we discuss the use of vibrational spectroscopy as a tool that allows for in situ observations of oxide nanoparticle surfaces and their evolution due to different surface processes. We highlight oxide nanoparticle surface chemistry, either engineered anthropogenic or naturally occurring geochemical nanoparticles, in complex media, with a focus on the impact of (a) pH on adsorption, intermolecular interactions, and conformational changes; (b) surface coatings and coadsorbates on protein adsorption kinetics and protein conformation; (c) surface adsorption on the temperature dependence of protein structure phase changes; and (d) the use of two-dimensional correlation spectroscopy to analyze spectroscopic results for complex systems. An outlook of the field and remaining challenges is also presented.
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Affiliation(s)
- Izaac Sit
- Department of Nanoengineering, University of California, San Diego, La Jolla, California 92093, USA; ,
| | - Haibin Wu
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA;
| | - Vicki H Grassian
- Department of Nanoengineering, University of California, San Diego, La Jolla, California 92093, USA; ,
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, USA;
- Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093, USA
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8
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Claro B, Goormaghtigh E, Bastos M. Attenuated total reflection-Fourier transform infrared spectroscopy: a tool to characterize antimicrobial cyclic peptide-membrane interactions. EUROPEAN BIOPHYSICS JOURNAL : EBJ 2021; 50:629-639. [PMID: 33743025 DOI: 10.1007/s00249-020-01495-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 12/16/2020] [Accepted: 12/31/2020] [Indexed: 11/24/2022]
Abstract
Attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) has been used for the structural characterization of peptides and their interactions with membranes. Antimicrobial peptides (AMPs) are part of our immune system and widely studied in recent years. Many linear AMPs have been studied, but their cyclization was shown to enhance the peptide's activity. We have used cyclic peptides (CPs) of an even number of alternating D- and L-α-amino acids, an emerging class of potential AMPs. These CPs can adopt a flat-ring shape that can stack into an antiparallel structure, forming intermolecular hydrogen bonds between different units, creating a tubular β-sheet structure - self-assembled cyclic peptide nanotubes (SCPNs). To get the structural information on peptides in solution and/or in contact with membranes, Amide I and II absorptions are used as they can adopt frequency and shape band characteristics that are influenced by the strength of existing hydrogen bonds between the amide CO and NH involved in secondary structures such as helix, β-sheet or aperiodic structures. The combination of polarized lens with ATR-FTIR provides an important tool to study the orientation of peptides when interacting with lipid membranes as the information can be derived on the position relative to the membrane normal. This work shows how ATR-FTIR used together with polarized light was successfully used to characterize structurally two CPs (RSKSWPgKQ and RSKSWXC10KQ) in solution and upon interaction with negatively charged membranes of DMPG, assessing the formation and orientation of tubular structures (SCPNs) that were shown to be enhanced by the presence of the lipid membrane.
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Affiliation(s)
- Bárbara Claro
- Departamento de Química e Bioquímica, Centro de Investigação em Química, Faculdade de Ciências, CIQUP, Universidade do Porto, Porto, Portugal
| | - Erik Goormaghtigh
- Structure and Function of Biological Membranes, Center for Structural Biology and Bioinformatics, ULB, Brussels, Belgium
| | - Margarida Bastos
- Departamento de Química e Bioquímica, Centro de Investigação em Química, Faculdade de Ciências, CIQUP, Universidade do Porto, Porto, Portugal.
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9
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Liang Y, Kitt JP, Minteer SD, Harris JM, Korzeniewski C. Vibrational Spectroscopic Monitoring of the Gelation Transition in Nafion Ionomer Dispersions. APPLIED SPECTROSCOPY 2021; 75:376-384. [PMID: 32700554 PMCID: PMC8027933 DOI: 10.1177/0003702820949129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Accepted: 06/10/2020] [Indexed: 05/17/2023]
Abstract
Infrared and Raman spectroscopy techniques were applied to investigate the drying and aggregation behavior of Nafion ionomer particles dispersed in aqueous solution. Gravimetric measurements aided the identification of gel-phase development within a series of time-resolved spectra that tracked transformations of a dispersion sample during solvent evaporation. A spectral band characteristic of ionomer sidechain end group vibration provided a quantitative probe of the dispersion-to-gel change. For sets of attenuated total reflection Fourier transform infrared (ATR FT-IR) spectra, adherence to Beer's law was attributed to the relatively constant refractive index in the frequency region of hydrated -SO 3 - group vibrations as fluorocarbon-rich ionomer regions aggregate in forming the structural framework of membranes and thin films. Although vibrational bands associated with ionomer backbone CF2 stretching vibrations were affected by distortion characteristic of wavelength-dependent refractive index change within a sample, the onset of band distortion signaled gel formation and coincided with ionomer mass % values just below the critical gelation point for Nafion aqueous dispersions. Similar temporal behavior was observed in confocal Raman microscopy experiments that monitored the formation of a thin ionomer film from an individual dispersion droplet. For the ATR FT-IR spectroscopy and confocal Raman microscopy techniques, intensity in the water H-O-H bending vibrational band dropped sharply at the ionomer critical gelation point and displayed a time dependence consistent with changes in water content derived from gravimetric measurements. The reported studies lay groundwork for examining the impact of dispersing solvents and above-ambient temperatures on fluorinated ionomer transformations that influence structural properties of dispersion-cast membranes and thin films.
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Affiliation(s)
- Ying Liang
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX, USA
| | - Jay P. Kitt
- Department of Chemistry, University of Utah, Salt Lake City, UT, USA
| | | | - Joel M. Harris
- Department of Chemistry, University of Utah, Salt Lake City, UT, USA
| | - Carol Korzeniewski
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX, USA
- Department of Chemistry, University of Utah, Salt Lake City, UT, USA
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10
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Yuan T, Wei W, Jiang W, Wang W. Vertical Diffusion of Ions within Single Particles during Electrochemical Charging. ACS NANO 2021; 15:3522-3528. [PMID: 33560133 DOI: 10.1021/acsnano.1c00431] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Determining the trajectory of ionic transport and diffusion within single electroactive nanomaterials is critical for understanding the charging kinetics and capacity fading associated with ion batteries, with implications for rational design of excellent-performance electrode materials. While the horizontal pathway of mass transport has been feasibly investigated by optical superlocalization methods and electron microscopes, determination on the vertical trajectory has proven a more challenging task. Herein, we developed dual-angle total internal reflection microscopy by simultaneously introducing different angle-dependent illumination depths to trace the optical centroid shifts of nano-objects in the vertical dimension. We first demonstrated the proof of concept by resolving the vertical moving trails of a nanosphere doing Brownian motion and subsequently explored the picture of mass transport in the interior of single Prussian blue (PB) particles during electrochemical cycling. The results indicated that the vertical centroids of single PB particles remained unchanged when ions were inserted or extracted, suggesting an outside-in ionic transport pathway instead of bottom-up trajectory that one would intuitively expect.
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Affiliation(s)
- Tinglian Yuan
- State Key Laboratory of Analytical Chemistry for Life Science, Chemistry and Biomedicine Innovation Center, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Wei Wei
- State Key Laboratory of Analytical Chemistry for Life Science, Chemistry and Biomedicine Innovation Center, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Wenxuan Jiang
- State Key Laboratory of Analytical Chemistry for Life Science, Chemistry and Biomedicine Innovation Center, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Wei Wang
- State Key Laboratory of Analytical Chemistry for Life Science, Chemistry and Biomedicine Innovation Center, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
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11
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Mendoza-Galván A, Méndez-Lara JG, Mauricio-Sánchez RA, Järrendahl K, Arwin H. Effective absorption coefficient and effective thickness in attenuated total reflection spectroscopy. OPTICS LETTERS 2021; 46:872-875. [PMID: 33577535 DOI: 10.1364/ol.418277] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 01/19/2021] [Indexed: 06/12/2023]
Abstract
Since the introduction of attenuated total reflection (ATR) spectroscopy for the characterization of materials, attempts have been made to relate the measured reflectivity (R) to the absorption coefficient (α) of the absorbing material of interest. The common approach is limited to the low absorption case under the assumption R∼exp(-αde), where de is an effective thickness, which is evaluated for the lossless case. In this Letter, a more detailed derivation leads to R=exp(-βdp/2), enabling the definition of an ATR-effective absorption coefficient β and the penetration depth dp of the electric field in the absorbing material. It is found that β∼4πε2/λ, where ε2 is the imaginary part of the complex dielectric function of the absorbing material, and λ is the wavelength. An alternative formulation is R=exp(-αdef), where def is a generalized effective thickness for arbitrary strength of absorption which reduces to de in the low absorption limit. The experimental data for water, the biopolymer chitosan, and soda-lime glass prove the reliability of the ATR-effective absorption coefficient in the infrared range.
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12
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Spectroscopic and electrochemical studies on the complexes of urea ligands with uranyl (VI) and europium (III) in ionic liquid. J Radioanal Nucl Chem 2020. [DOI: 10.1007/s10967-020-07441-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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13
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Nyamekye CKA, Bobbitt JM, Zhu Q, Smith EA. The evolution of total internal reflection Raman spectroscopy for the chemical characterization of thin films and interfaces. Anal Bioanal Chem 2020; 412:6009-6022. [PMID: 32173790 DOI: 10.1007/s00216-020-02510-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2019] [Revised: 01/30/2020] [Accepted: 02/11/2020] [Indexed: 11/28/2022]
Abstract
Total internal reflection (TIR) optical spectroscopies have been widely used for decades as non-destructive and surface-sensitive measurements of thin films and interfaces. Under TIR conditions, an evanescent wave propagates into the sample layer within a region approximately 50 nm to 2 μm from the interface, which limits the spatial extent of the optical signal. The most common TIR optical spectroscopies are fluorescence (i.e., TIRF) and infrared spectroscopy (i.e., attenuated total reflection infrared). Despite the first report of TIR Raman spectroscopy appearing in 1973, this method has not received the same attention to date. While TIR Raman methods can provide chemical specific information, it has been outshined in many respects by surface-enhanced Raman spectroscopy (SERS). TIR Raman spectroscopy, however, is garnering more interest for analyzing the chemical and physical properties of thin polymer films, self-assembled monolayers (SAMs), multilayered systems, and adsorption at an interface. Herein, we discuss the early experimental and computational work that laid the foundation for recent developments in the use of TIR Raman techniques. Recent applications of TIR Raman spectroscopy as well as modern TIR Raman instruments capable of measuring monolayer-sensitive vibrational modes on smooth metallic surfaces are also discussed. The use of TIR Raman spectroscopy has been on a rise and will continue to push the limits for chemical specific interfacial and thin film measurements. Graphical abstract Total internal reflection (TIR) Raman spectroscopy can extract the chemical and physical information from thin films and adsorbates.
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Affiliation(s)
- Charles K A Nyamekye
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, IA, 50011, USA.,The Ames Laboratory, U.S. Department of Energy, Ames, IA, 50011, USA
| | - Jonathan M Bobbitt
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, IA, 50011, USA.,The Ames Laboratory, U.S. Department of Energy, Ames, IA, 50011, USA
| | - Qiaochu Zhu
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, IA, 50011, USA
| | - Emily A Smith
- Department of Chemistry, Iowa State University, 1605 Gilman Hall, 2415 Osborn Drive, Ames, IA, 50011, USA. .,The Ames Laboratory, U.S. Department of Energy, Ames, IA, 50011, USA.
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14
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Igbinosun OJ, Bruckner AP, Wood SE. In Situ Measurements of Water Content for Sub-Surface Planetary Applications Using Near-Infrared Internal Reflection Spectroscopy (IRS) with a Multimode Optical Fiber. APPLIED SPECTROSCOPY 2020; 74:160-167. [PMID: 29847999 DOI: 10.1177/0003702818781868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Results and analysis of internal reflection spectral absorbance experiments are reported for near-infrared (NIR) spectra obtained using an optical fiber sensor system. We present a preliminary study to diagnose the efficacy of our fiber optic system to observe and distinguish various phases of water, i.e., ice, liquid, and adsorbed. This study was motivated by the need for a technique capable of obtaining soil water content measurements in real time and in situ, at low humidity conditions for simulation studies of planetary bodies such as Mars. Spectral signatures were observed for the solid, liquid, and adsorbed phases of water. For all phases, peak absorbance at λ ≈1.45 and 1.94 μm was observed despite slight peak shifting due to dispersion effects. Dispersion effects commonly obscure spectra obtained with internal reflection spectroscopy for particular spectral regions. Here we report a spectral region with minimal distortions. Internal reflection spectra were compared directly to transmission spectra with only slight variations. Spectral matching was performed to determine sample penetration depths for unknown incidence angles. In general, relative absorbance and spectral shifting can distinguish spectra of the various phases of water.
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Affiliation(s)
| | - Adam P Bruckner
- Department of Aeronautics and Astronautics, University of Washington, Seattle, WA, USA
| | - Stephen E Wood
- Department of Earth and Space Sciences, University of Washington, Seattle, WA, USA
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15
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Label-Free MicroRNA Optical Biosensors. NANOMATERIALS 2019; 9:nano9111573. [PMID: 31698769 PMCID: PMC6915498 DOI: 10.3390/nano9111573] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 10/29/2019] [Accepted: 10/31/2019] [Indexed: 02/07/2023]
Abstract
MicroRNAs (miRNAs) play crucial roles in regulating gene expression. Many studies show that miRNAs have been linked to almost all kinds of disease. In addition, miRNAs are well preserved in a variety of specimens, thereby making them ideal biomarkers for biosensing applications when compared to traditional protein biomarkers. Conventional biosensors for miRNA require fluorescent labeling, which is complicated, time-consuming, laborious, costly, and exhibits low sensitivity. The detection of miRNA remains a big challenge due to their intrinsic properties such as small sizes, low abundance, and high sequence similarity. A label-free biosensor can simplify the assay and enable the direct detection of miRNA. The optical approach for a label-free miRNA sensor is very promising and many assays have demonstrated ultra-sensitivity (aM) with a fast response time. Here, we review the most relevant label-free microRNA optical biosensors and the nanomaterials used to enhance the performance of the optical biosensors.
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16
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Odd-even effects on hydration of natural polyelectrolyte multilayers: An in situ synchrotron FTIR microspectroscopy study. J Colloid Interface Sci 2019; 553:720-733. [DOI: 10.1016/j.jcis.2019.06.036] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 06/07/2019] [Accepted: 06/11/2019] [Indexed: 11/20/2022]
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17
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Willott JD, Humphreys BA, Webber GB, Wanless EJ, de Vos WM. Combined Experimental and Theoretical Study of Weak Polyelectrolyte Brushes in Salt Mixtures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:2709-2718. [PMID: 30661354 PMCID: PMC6407915 DOI: 10.1021/acs.langmuir.8b03838] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2018] [Revised: 01/07/2019] [Indexed: 05/30/2023]
Abstract
The swelling behavior of a hydrophobic poly(2diisopropylamino)ethyl methacrylate (PDPA) brush immersed in aqueous solutions of single and mixed salts has been investigated using ellipsometry and numerical self-consistent field (nSCF) theory. As a function of solution ionic strength, the osmotic and salted brush regimes of weak polyelectrolyte brushes as well as substantial specific anion effects in the presence of K+ salts of Cl-, NO3-, and SCN- are found. For solutions containing mixtures of NO3- and Cl-, the brush swelling is the same as one would expect on the basis of the concentration-weighted average of the brush behavior in the single salt solutions. However, in mixtures of SCN- and Cl-, the swelling response is more complicated and substantial divergence from ideal behavior is observed. Mean-field theory shows excellent qualitative agreement with the ellipsometry findings. nSCF reveals that for the SCN-/Cl- cases the swelling behavior of the PDPA brush most likely arises from the predominant localization of the weakly hydrated SCN- within the brush compared to the more strongly hydrated Cl-.
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Affiliation(s)
- Joshua D. Willott
- Membrane
Science and Technology, Mesa+ Institute for Nanotechnology, University of Twente, Enschede 7500 AE, The Netherlands
| | - Ben A. Humphreys
- Priority
Research Centre for Advanced Particle Processing and Transport, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Grant B. Webber
- Priority
Research Centre for Advanced Particle Processing and Transport, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Erica J. Wanless
- Priority
Research Centre for Advanced Particle Processing and Transport, University of Newcastle, Callaghan, NSW 2308, Australia
| | - Wiebe M. de Vos
- Membrane
Science and Technology, Mesa+ Institute for Nanotechnology, University of Twente, Enschede 7500 AE, The Netherlands
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18
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Benbow NL, Webber JL, Pawliszak P, Sebben DA, Ho TTM, Vongsvivut J, Tobin MJ, Krasowska M, Beattie DA. A Novel Soft Contact Piezo-Controlled Liquid Cell for Probing Polymer Films under Confinement using Synchrotron FTIR Microspectroscopy. Sci Rep 2018; 8:17804. [PMID: 30546121 PMCID: PMC6292912 DOI: 10.1038/s41598-018-34673-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Accepted: 10/11/2018] [Indexed: 12/21/2022] Open
Abstract
Soft polymer films, such as polyelectrolyte multilayers (PEMs), are useful coatings in materials science. The properties of PEMs often rely on the degree of hydration, and therefore the study of these films in a hydrated state is critical to allow links to be drawn between their characteristics and performance in a particular application. In this work, we detail the development of a novel soft contact cell for studying hydrated PEMs (poly(sodium 4-styrenesulfonate)/poly(allylamine hydrochloride)) using FTIR microspectroscopy. FTIR spectroscopy can interrogate the nature of the polymer film and the hydration water contained therein. In addition to reporting spectra obtained for hydrated films confined at the solid-solid interface, we also report traditional ATR FTIR spectra of the multilayer. The spectra (microspectroscopy and ATR FTIR) reveal that the PEM film build-up proceeds as expected based on the layer-by-layer assembly methodology, with increasing signals from the polymer FTIR peaks with increasing bilayer number. In addition, the spectra obtained using the soft contact cell indicate that the PEM film hydration water has an environment/degree of hydrogen bonding that is affected by the chemistry of the multilayer polymers, based on differences in the spectra obtained for the hydration water within the film compared to that of bulk electrolyte.
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Affiliation(s)
- Natalie L Benbow
- Future Industries Institute, University of South Australia, Mawson Lakes, South Australia, 5095, Australia.,School of Information Technology and Mathematical Sciences, University of South Australia, Mawson Lakes, South Australia, 5095, Australia
| | - Jessie L Webber
- Future Industries Institute, University of South Australia, Mawson Lakes, South Australia, 5095, Australia.,School of Information Technology and Mathematical Sciences, University of South Australia, Mawson Lakes, South Australia, 5095, Australia
| | - Piotr Pawliszak
- Future Industries Institute, University of South Australia, Mawson Lakes, South Australia, 5095, Australia.,School of Information Technology and Mathematical Sciences, University of South Australia, Mawson Lakes, South Australia, 5095, Australia
| | - Damien A Sebben
- Future Industries Institute, University of South Australia, Mawson Lakes, South Australia, 5095, Australia
| | - Tracey T M Ho
- Future Industries Institute, University of South Australia, Mawson Lakes, South Australia, 5095, Australia
| | - Jitraporn Vongsvivut
- Infrared Microspectroscopy (IRM) Beamline, Australian Synchrotron, Clayton, Victoria, 3168, Australia
| | - Mark J Tobin
- Infrared Microspectroscopy (IRM) Beamline, Australian Synchrotron, Clayton, Victoria, 3168, Australia
| | - Marta Krasowska
- Future Industries Institute, University of South Australia, Mawson Lakes, South Australia, 5095, Australia.,School of Information Technology and Mathematical Sciences, University of South Australia, Mawson Lakes, South Australia, 5095, Australia
| | - David A Beattie
- Future Industries Institute, University of South Australia, Mawson Lakes, South Australia, 5095, Australia. .,School of Information Technology and Mathematical Sciences, University of South Australia, Mawson Lakes, South Australia, 5095, Australia.
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19
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Li M, Yuan T, Jiang Y, Sun L, Wei W, Chen HY, Wang W. Total Internal Reflection-Based Extinction Spectroscopy of Single Nanoparticles. Angew Chem Int Ed Engl 2018; 58:572-576. [PMID: 30397979 DOI: 10.1002/anie.201810324] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Indexed: 01/05/2023]
Abstract
Herein we report a reflection-mode total internal reflection microscopy (TIRM) to measure the extinction spectrum of individual dielectric, plasmonic, or light-absorbing nanoparticles, and to differentiate absorption and scattering components from the total optical output. These capabilities were enabled via illuminating the sample with evanescent wave of which the lightpath length was comparable with the size of single nanoparticles, leading to a dramatically improved reflectance change (ΔI/I0 ) up to tens of percent. It was further found that scattering and absorption of light contributed to bright and dark centroids, respectively, in the optical patterns of single nanoparticles, allowing to distinguish scattering and absorption components from the extinction spectrum by the use of an appropriate image processing method. In addition, wide-field feature of TIRM enabled the studies on tens of nanoparticles simultaneously with gentle illumination.
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Affiliation(s)
- Meng Li
- School of Chemistry and Chemical Engineering, State Key Laboratory of Analytical Chemistry for Life Science, Nanjing University, Nanjing, Jiangsu, 210023, China
| | - Tinglian Yuan
- School of Chemistry and Chemical Engineering, State Key Laboratory of Analytical Chemistry for Life Science, Nanjing University, Nanjing, Jiangsu, 210023, China
| | - Yingyan Jiang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Analytical Chemistry for Life Science, Nanjing University, Nanjing, Jiangsu, 210023, China
| | - Linlin Sun
- School of Chemistry and Chemical Engineering, State Key Laboratory of Analytical Chemistry for Life Science, Nanjing University, Nanjing, Jiangsu, 210023, China
| | - Wei Wei
- School of Chemistry and Chemical Engineering, State Key Laboratory of Analytical Chemistry for Life Science, Nanjing University, Nanjing, Jiangsu, 210023, China
| | - Hong-Yuan Chen
- School of Chemistry and Chemical Engineering, State Key Laboratory of Analytical Chemistry for Life Science, Nanjing University, Nanjing, Jiangsu, 210023, China
| | - Wei Wang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Analytical Chemistry for Life Science, Nanjing University, Nanjing, Jiangsu, 210023, China
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20
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Li M, Yuan T, Jiang Y, Sun L, Wei W, Chen HY, Wang W. Total Internal Reflection-Based Extinction Spectroscopy of Single Nanoparticles. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201810324] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Meng Li
- School of Chemistry and Chemical Engineering; State Key Laboratory of Analytical Chemistry for Life Science; Nanjing University; Nanjing Jiangsu 210023 China
| | - Tinglian Yuan
- School of Chemistry and Chemical Engineering; State Key Laboratory of Analytical Chemistry for Life Science; Nanjing University; Nanjing Jiangsu 210023 China
| | - Yingyan Jiang
- School of Chemistry and Chemical Engineering; State Key Laboratory of Analytical Chemistry for Life Science; Nanjing University; Nanjing Jiangsu 210023 China
| | - Linlin Sun
- School of Chemistry and Chemical Engineering; State Key Laboratory of Analytical Chemistry for Life Science; Nanjing University; Nanjing Jiangsu 210023 China
| | - Wei Wei
- School of Chemistry and Chemical Engineering; State Key Laboratory of Analytical Chemistry for Life Science; Nanjing University; Nanjing Jiangsu 210023 China
| | - Hong-Yuan Chen
- School of Chemistry and Chemical Engineering; State Key Laboratory of Analytical Chemistry for Life Science; Nanjing University; Nanjing Jiangsu 210023 China
| | - Wei Wang
- School of Chemistry and Chemical Engineering; State Key Laboratory of Analytical Chemistry for Life Science; Nanjing University; Nanjing Jiangsu 210023 China
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21
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Liang Y, Cai R, Hickey DP, Kitt JP, Harris JM, Minteer SD, Korzeniewski C. Infrared Microscopy as a Probe of Composition within a Model Biofuel Cell Electrode Prepared from
Trametes versicolor
Laccase. ChemElectroChem 2018. [DOI: 10.1002/celc.201801178] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Ying Liang
- Department of Chemistry and Biochemistry Texas Tech University Lubbock TX 79409-1061 USA
| | - Rong Cai
- Department of Chemistry University of Utah Salt Lake City UT 84112 USA
| | - David P. Hickey
- Department of Chemistry University of Utah Salt Lake City UT 84112 USA
| | - Jay P. Kitt
- Department of Chemistry University of Utah Salt Lake City UT 84112 USA
| | - Joel M. Harris
- Department of Chemistry University of Utah Salt Lake City UT 84112 USA
| | | | - Carol Korzeniewski
- Department of Chemistry and Biochemistry Texas Tech University Lubbock TX 79409-1061 USA
- Department of Chemistry University of Utah Salt Lake City UT 84112 USA
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22
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Bai W, Yang H, Ma Y, Chen H, Shin J, Liu Y, Yang Q, Kandela I, Liu Z, Kang SK, Wei C, Haney CR, Brikha A, Ge X, Feng X, Braun P, Huang Y, Zhou W, Rogers JA. Flexible Transient Optical Waveguides and Surface-Wave Biosensors Constructed from Monocrystalline Silicon. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1801584. [PMID: 29944186 PMCID: PMC6148372 DOI: 10.1002/adma.201801584] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2018] [Revised: 04/17/2018] [Indexed: 05/18/2023]
Abstract
Optical technologies offer important capabilities in both biological research and clinical care. Recent interest is in implantable devices that provide intimate optical coupling to biological tissues for a finite time period and then undergo full bioresorption into benign products, thereby serving as temporary implants for diagnosis and/or therapy. The results presented here establish a silicon-based, bioresorbable photonic platform that relies on thin filaments of monocrystalline silicon encapsulated by polymers as flexible, transient optical waveguides for accurate light delivery and sensing at targeted sites in biological systems. Comprehensive studies of the mechanical and optical properties associated with bending and unfurling the waveguides from wafer-scale sources of materials establish general guidelines in fabrication and design. Monitoring biochemical species such as glucose and tracking physiological parameters such as oxygen saturation using near-infrared spectroscopic methods demonstrate modes of utility in biomedicine. These concepts provide versatile capabilities in biomedical diagnosis, therapy, deep-tissue imaging, and surgery, and suggest a broad range of opportunities for silicon photonics in bioresorbable technologies.
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Affiliation(s)
- Wubin Bai
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA
- Center for Bio-Integrated Electronics, Northwestern University, Evanston, Illinois 60208, USA
| | - Hongjun Yang
- Department of Electrical Engineering, University of Texas at Arlington, Arlington, Texas 76019-0072, USA
| | - Yinji Ma
- Department of Engineering Mechanics, Center for Mechanics and Materials, Tsinghua University, Beijing 100084, China
| | - Hao Chen
- Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, and Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Jiho Shin
- Department of Chemical and Biomolecular Engineering, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Yonghao Liu
- Department of Electrical Engineering, University of Texas at Arlington, Arlington, Texas 76019-0072, USA
| | - Quansan Yang
- Department of Mechanical Engineering, Northwestern University, Evanston, Illinois 60208, USA
| | - Irawati Kandela
- The Center for Developmental Therapeutics, Northwestern University, Evanston, Illinois 60208, USA
| | - Zhonghe Liu
- Department of Electrical Engineering, University of Texas at Arlington, Arlington, Texas 76019-0072, USA
| | - Seung-Kyun Kang
- Department of Bio and Brain Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
| | - Chen Wei
- Department of Civil and Environmental Engineering, Northwestern University, Evanston, Illinois 60208, USA
- Department of Mechanical Engineering, Northwestern University, Evanston, Illinois 60208, USA
| | - Chad R. Haney
- Chemistry Life Processes Institute, Northwestern University, Evanston, Illinois 60208, USA
| | - Anlil Brikha
- Chemistry Life Processes Institute, Northwestern University, Evanston, Illinois 60208, USA
| | - Xiaochen Ge
- Department of Electrical Engineering, University of Texas at Arlington, Arlington, Texas 76019-0072, USA
| | - Xue Feng
- Department of Engineering Mechanics, Center for Mechanics and Materials, Tsinghua University, Beijing 100084, China
| | - Paul Braun
- Department of Materials Science and Engineering, Frederick Seitz Materials Research Laboratory, and Beckman Institute for Advanced Science and Technology, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA
| | - Yonggang Huang
- Department of Civil and Environmental Engineering, Northwestern University, Evanston, Illinois 60208, USA
- Department of Mechanical Engineering, Northwestern University, Evanston, Illinois 60208, USA
- Center for Bio-Integrated Electronics, Northwestern University, Evanston, Illinois 60208, USA
| | - Weidong Zhou
- Department of Electrical Engineering, University of Texas at Arlington, Arlington, Texas 76019-0072, USA
| | - John A. Rogers
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA
- Departments of Biomedical Engineering, Neurological Surgery, Electrical Engineering and Computer Science, Mechanical Engineering and Chemistry, Northwestern University, Evanston, Illinois 60208, USA
- Center for Bio-Integrated Electronics, Northwestern University, Evanston, Illinois 60208, USA
- Simpson Querrey Institute for BioNanotechnology, Northwestern University, Evanston, Illinois 60208, USA
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23
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Zhu C, Ge B, Chen R, Zhu X, Mi L, Ma J, Wang X, Zheng F, Fei Y. Fast Focal Point Correction in Prism-Coupled Total Internal Reflection Scanning Imager Using an Electronically Tunable Lens. SENSORS (BASEL, SWITZERLAND) 2018; 18:E524. [PMID: 29425166 PMCID: PMC5854966 DOI: 10.3390/s18020524] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Revised: 02/05/2018] [Accepted: 02/08/2018] [Indexed: 12/17/2022]
Abstract
Total internal reflection (TIR) is useful for interrogating physical and chemical processes that occur at the interface between two transparent media. Yet prism-coupled TIR imaging microscopes suffer from limited sensing areas due to the fact that the interface (the object plane) is not perpendicular to the optical axis of the microscope. In this paper, we show that an electrically tunable lens can be used to rapidly and reproducibly correct the focal length of an oblique-incidence scanning microscope (OI-RD) in a prism-coupled TIR geometry. We demonstrate the performance of such a correction by acquiring an image of a protein microarray over a scan area of 4 cm² with an effective resolution of less than 20 microns. The electronic focal length tuning eliminates the mechanical movement of the illumination lens in the scanning microscope and in turn the noise and background drift associated with the motion.
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Affiliation(s)
- Chenggang Zhu
- Department of Optical Science and Engineering, Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, China.
| | - Bilin Ge
- Department of Optical Science and Engineering, Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, China.
| | - Ru Chen
- Department of Optical Science and Engineering, Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, China.
| | - Xiangdong Zhu
- Department of Physics, University of California, Davis, CA 95616, USA.
| | - Lan Mi
- Department of Optical Science and Engineering, Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, China.
| | - Jiong Ma
- Department of Optical Science and Engineering, Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, China.
| | - Xu Wang
- Department of Fundamental Courses, Wuxi Institute of Technology, Wuxi 214121, China.
| | - Fengyun Zheng
- Institutes of Biomedical Science, Fudan University, Shanghai 200032, China.
| | - Yiyan Fei
- Department of Optical Science and Engineering, Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, China.
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24
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Lee MCG, Sun B. Quantitation of nonspecific protein adsorption at solid–liquid interfaces for single-cell proteomics. CAN J CHEM 2018. [DOI: 10.1139/cjc-2017-0304] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Protein nonspecific adsorption that occurred at the solid–liquid interface has been subjected to intense physical and chemical characterizations due to its crucial role in a wide range of applications, including food and pharmaceutical industries, medical implants, biosensing, and so on. Protein-adsorption caused sample loss has largely hindered the studies of single-cell proteomics; the prevention of such loss requires the understanding of protein–surface adsorption at the proteome level, in which the competitive adsorption of thousands and millions of proteins with vast dynamic range occurs. To this end, we feel the necessity to review current methodologies on their potentials to characterize — more specifically to quantify — the proteome-wide adsorption. We hope this effort can help advancing single-cell proteomics and trace proteomics.
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Affiliation(s)
| | - Bingyun Sun
- Department of Chemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
- Department of Molecular Biology and Biochemistry, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
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25
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Niu F, Schulz R, Castañeda Medina A, Schmid R, Erbe A. Electrode potential dependent desolvation and resolvation of germanium(100) in contact with aqueous perchlorate electrolytes. Phys Chem Chem Phys 2017; 19:13585-13595. [PMID: 28513645 DOI: 10.1039/c6cp08908a] [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
The electrode potential dependence of the hydration layer on an n-Ge(100) surface was studied by a combination of in situ and operando electrochemical attenuated total reflection infrared (ATR-IR) spectroscopy and real space density functional theory (DFT) calculations. Constant-potential DFT calculations were coupled to a modified generalised Poisson-Boltzmann ion distribution model and applied within an ab initio molecular dynamics (AIMD) scheme. As a result, potential-dependent vibrational spectra of surface species and surface water were obtained, both experimentally and by simulations. The experimental spectra show increasing absorbance from the Ge-H stretching modes at negative potentials, which is associated with an increased negative difference absorbance of water-related OH modes. When the termination transition of germanium from OH to H termination occurs, the surface switches from hydrophilic to hydrophobic. This transition is fully reversible. During the switching, the interface water molecules are displaced from the surface forming a "hydrophobic gap". The gap thickness was experimentally estimated by a continuum electrodynamic model to be ≈2 Å. The calculations showed a shift in the centre of mass of the interface water by ≈0.9 Å due to the surface transformation. The resulting IR spectra of the interfacial water in contact with the hydrophobic Ge-H show an increased absorbance of free OH groups, and a decreased absorbance of strongly hydrogen bound water. Consequently, the surface transformation to a Ge-H terminated surface leads to a surface which is weakening the H-bond network of the interfacial water in contact.
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Affiliation(s)
- Fang Niu
- Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Düsseldorf, Germany.
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26
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Müller P, Hermans I. Applications of Modulation Excitation Spectroscopy in Heterogeneous Catalysis. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.6b04855] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Philipp Müller
- Department of Chemistry & Department of Chemical Engineering, University of Wisconsin−Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Ive Hermans
- Department of Chemistry & Department of Chemical Engineering, University of Wisconsin−Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
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27
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Liljeblad JFD, Furó I, Tyrode EC. The premolten layer of ice next to a hydrophilic solid surface: correlating adhesion with molecular properties. Phys Chem Chem Phys 2017; 19:305-317. [DOI: 10.1039/c6cp05303c] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Multiple spectroscopy techniques have been used to correlate macroscopic adhesion to molecular properties of the premolten layer of ice next to silica.
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Affiliation(s)
- Jonathan F. D. Liljeblad
- Department of Chemistry
- School of Chemical Science and Engineering
- KTH Royal Institute of Technology
- SE-100 44 Stockholm
- Sweden
| | - István Furó
- Department of Chemistry
- School of Chemical Science and Engineering
- KTH Royal Institute of Technology
- SE-100 44 Stockholm
- Sweden
| | - Eric C. Tyrode
- Department of Chemistry
- School of Chemical Science and Engineering
- KTH Royal Institute of Technology
- SE-100 44 Stockholm
- Sweden
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28
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Kraack JP, Hamm P. Surface-Sensitive and Surface-Specific Ultrafast Two-Dimensional Vibrational Spectroscopy. Chem Rev 2016; 117:10623-10664. [DOI: 10.1021/acs.chemrev.6b00437] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Jan Philip Kraack
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
| | - Peter Hamm
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
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29
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Ngo D, Baldelli S. Adsorption of Dimethyldodecylamine Oxide and Its Mixtures with Triton X-100 at the Hydrophilic Silica/Water Interface Studied Using Total Internal Reflection Raman Spectroscopy. J Phys Chem B 2016; 120:12346-12357. [PMID: 27934225 DOI: 10.1021/acs.jpcb.6b08853] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dien Ngo
- Department of Chemistry, University of Houston, Lamar Fleming Jr. Building, 3585 Cullen Blvd.,
Room 112, Houston, Texas 77204-5003, United States
| | - Steven Baldelli
- Department of Chemistry, University of Houston, Lamar Fleming Jr. Building, 3585 Cullen Blvd.,
Room 112, Houston, Texas 77204-5003, United States
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30
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Affiliation(s)
- Ivano Alessandri
- INSTM
and Chemistry for Technologies Laboratory, University of Brescia, Brescia 25123, Italy
| | - John R. Lombardi
- Department
of Chemistry, The City College of New York, New York 10031, United States
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31
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Chou RY, Li G, Cheng Y, He Y, Zhao J, Cao Z, Gong Q, Lu G. Surface enhanced fluorescence by metallic nano-apertures associated with stair-gratings. OPTICS EXPRESS 2016; 24:19567-19573. [PMID: 27557234 DOI: 10.1364/oe.24.019567] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Metallic nano-apertures associated with stair-gratings are proposed for surface enhanced fluorescence with high excitation enhancement and narrow emission beaming effect. Fluorescence correlation spectroscopy method was utilized to analyze the fluorescence trace and fluorescence enhancement, and the angular patterns of fluorescent emission were measured with the back focal plane imaging method. The stair-grating presents a strong optical response which covering well both the excitation and the emission bands of the photoluminescence process. Such high enhancement and narrow directionality by the stair-gratings would enable the detection of single molecules with low numerical aperture objective effectively.
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Nanoscale characterization of vesicle adhesion by normalized total internal reflection fluorescence microscopy. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:1244-53. [PMID: 26972045 DOI: 10.1016/j.bbamem.2016.03.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Revised: 02/26/2016] [Accepted: 03/04/2016] [Indexed: 11/20/2022]
Abstract
We recently proposed a straightforward fluorescence microscopy technique to study adhesion of Giant Unilamellar Vesicles. This technique is based on dual observations which combine epi-fluorescence microscopy and total internal reflection fluorescence (TIRF) microscopy: TIRF images are normalized by epi-fluorescence ones. By this way, it is possible to map the membrane/substrate separation distance with a nanometric resolution, typically ~20 nm, with a maximal working range of 300-400 nm. The purpose of this paper is to demonstrate that this technique is useful to quantify vesicle adhesion from ultra-weak to strong membrane-surface interactions. Thus, we have examined unspecific and specific adhesion conditions. Concerning unspecific adhesion, we have controlled the strength of electrostatic forces between negatively charged vesicles and various functionalized surfaces which exhibit a positive or a negative effective charge. Specific adhesion was highlighted with lock-and-key forces mediated by the well defined biotin/streptavidin recognition.
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Vibrational Spectroscopic Techniques for Probing Bioelectrochemical Systems. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2016; 158:75-110. [DOI: 10.1007/10_2016_3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Nayak S, Erbe A. Mechanism of the potential-triggered surface transformation of germanium in acidic medium studied by ATR-IR spectroscopy. Phys Chem Chem Phys 2016; 18:25100-25109. [DOI: 10.1039/c6cp04514f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
During the electrochemical surface transformation of Ge(100) and Ge(111) surfaces from an –OH to an –H terminated surface, different potential dependent transient species are observed.
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Affiliation(s)
- Simantini Nayak
- Max-Planck-Institut für Eisenforschung GmbH
- Düsseldorf
- Germany
| | - Andreas Erbe
- Max-Planck-Institut für Eisenforschung GmbH
- Düsseldorf
- Germany
- Department of Materials Science and Engineering
- NTNU
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Spectroscopic studies on uranyl complexes with tri-n-butyl phosphate (TBP) in ionic liquids. J Radioanal Nucl Chem 2015. [DOI: 10.1007/s10967-015-4608-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Wu X, Liu Y, Hu S, Chu T. Extraction of uranyl ion into ionic liquid by N,N,N′,N′-tetrabutylsuccinamide and spectroscopic study of uranyl complex. J Radioanal Nucl Chem 2015. [DOI: 10.1007/s10967-015-4257-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Bhakta SA, Evans E, Benavidez TE, Garcia CD. Protein adsorption onto nanomaterials for the development of biosensors and analytical devices: a review. Anal Chim Acta 2015; 872:7-25. [PMID: 25892065 PMCID: PMC4405630 DOI: 10.1016/j.aca.2014.10.031] [Citation(s) in RCA: 139] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Revised: 09/25/2014] [Accepted: 10/21/2014] [Indexed: 12/11/2022]
Abstract
An important consideration for the development of biosensors is the adsorption of the biorecognition element to the surface of a substrate. As the first step in the immobilization process, adsorption affects most immobilization routes and much attention is given into the research of this process to maximize the overall activity of the biosensor. The use of nanomaterials, specifically nanoparticles and nanostructured films, offers advantageous properties that can be fine-tuned to maximize interactions with specific proteins to maximize activity, minimize structural changes, and enhance the catalytic step. In the biosensor field, protein-nanomaterial interactions are an emerging trend that span across many disciplines. This review addresses recent publications about the proteins most frequently used, their most relevant characteristics, and the conditions required to adsorb them to nanomaterials. When relevant and available, subsequent analytical figures of merits are discussed for selected biosensors. The general trend amongst the research papers allows concluding that the use of nanomaterials has already provided significant improvements in the analytical performance of many biosensors and that this research field will continue to grow.
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Affiliation(s)
- Samir A Bhakta
- Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA
| | - Elizabeth Evans
- Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA
| | - Tomás E Benavidez
- Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA
| | - Carlos D Garcia
- Department of Chemistry, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA.
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Ota C. Investigation of the structure of water at hydrophobic and hydrophilic interfaces by angle-resolved TIR Raman spectroscopy. Phys Chem Chem Phys 2015; 17:26435-42. [DOI: 10.1039/c5cp03581c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Angle-resolved TIR Raman spectroscopy with PCA was applied to hydrophobic and hydrophilic interfaces to detect minute species located within a few nm of each interface.
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Peng Y, Xiong B, Peng L, Li H, He Y, Yeung ES. Recent advances in optical imaging with anisotropic plasmonic nanoparticles. Anal Chem 2014; 87:200-15. [PMID: 25375954 DOI: 10.1021/ac504061p] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Yinhe Peng
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, College of Biology, Hunan University , Changsha, Hunan 410082, P. R. China
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Ye S, Tong Y, Ge A, Qiao L, Davies PB. Interfacial Structure of Soft Matter Probed by SFG Spectroscopy. CHEM REC 2014; 14:791-805. [DOI: 10.1002/tcr.201402039] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Indexed: 01/05/2023]
Affiliation(s)
- Shen Ye
- Catalysis Research Center; Hokkaido University; Sapporo 001-0021 Japan
| | - Yujin Tong
- Catalysis Research Center; Hokkaido University; Sapporo 001-0021 Japan
| | - Aimin Ge
- Catalysis Research Center; Hokkaido University; Sapporo 001-0021 Japan
| | - Lin Qiao
- Catalysis Research Center; Hokkaido University; Sapporo 001-0021 Japan
| | - Paul B. Davies
- Department of Chemistry; Cambridge University; Cambridge CB2 1EW UK
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Praveena M, Guha K, Ravishankar A, Biswas SK, Bain CD, Jayaram V. Total internal reflection Raman spectroscopy of poly(alpha-olefin) oils in a lubricated contact. RSC Adv 2014. [DOI: 10.1039/c4ra02261k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel total internal reflection (TIR) Raman tribometer has been used to explore the physiochemical changes associated with shear-thinning in synthetic base oil.
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Affiliation(s)
- Manimunda Praveena
- Department of Materials Engineering
- Indian Institute of Science
- Bangalore, India
| | - Kaustav Guha
- Department of Chemistry
- Durham University
- Durham, UK
| | | | - Sanjay K. Biswas
- Department of Mechanical Engineering
- Indian Institute of Science
- Bangalore, India
| | | | - Vikram Jayaram
- Department of Materials Engineering
- Indian Institute of Science
- Bangalore, India
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