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Southern SA, Liu DJ, Chatterjee P, Li Y, Perras FA. 1H chemical shift anisotropy: a high sensitivity solid-state NMR dynamics probe for surface studies? Phys Chem Chem Phys 2023; 25:5348-5360. [PMID: 36399032 DOI: 10.1039/d2cp04406d] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Dynamics play significant roles in chemistry and biochemistry-molecular motions impact both large- and small-scale chemical reactions in addition to biochemical processes. In many systems, including heterogeneous catalysts, the characterization of dynamics remains a challenge. The most common approaches involve the solid-state NMR measurement of anisotropic interactions, in particular 2H quadrupolar coupling and 1H-X dipolar coupling, which generally require isotope enrichment. Due to the high sensitivity of 1H NMR, 1H chemical shift anisotropy (CSA) is a particularly enticing, and underexplored, dynamics probe. We carried out 1H CSA and 1H-13C dipolar coupling measurements in a series of model supported complexes to understand how 1H CSA can be leveraged to gain dynamic information for heterogeneous catalysts. Mathematical descriptions are given for the dynamic averaging of the CSA tensor, and its dependence on orientation and asymmetry. The variability of the orientation of the tensor in the molecular frame, in addition to its magnitude and asymmetry, negatively impacts attempts to extract quantitative dynamic information. Nevertheless, 1H CSA measurements can reveal useful qualitative insights into the motions of a particularly dilute site, such as from a surface species.
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Affiliation(s)
- Scott A Southern
- Division of Chemical and Biological Sciences, Ames National Laboratory, Ames, IA 50014, USA.
| | - Da-Jiang Liu
- Division of Chemical and Biological Sciences, Ames National Laboratory, Ames, IA 50014, USA.
| | - Puranjan Chatterjee
- Division of Chemical and Biological Sciences, Ames National Laboratory, Ames, IA 50014, USA. .,Department of Chemistry, Iowa State University, Ames, IA 50014, USA
| | - Yuting Li
- Division of Chemical and Biological Sciences, Ames National Laboratory, Ames, IA 50014, USA.
| | - Frédéric A Perras
- Division of Chemical and Biological Sciences, Ames National Laboratory, Ames, IA 50014, USA.
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Buntkowsky G, Döller S, Haro-Mares N, Gutmann T, Hoffmann M. Solid-state NMR studies of non-ionic surfactants confined in mesoporous silica. Z PHYS CHEM 2021. [DOI: 10.1515/zpch-2021-3132] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Abstract
This review gives an overview of current trends in the investigation of confined molecules such as higher alcohols, ethylene glycol and polyethylene glycol as guest molecules in neat and functionalized mesoporous silica materials. All these molecules have both hydrophobic and hydrophilic parts. They are characteristic role-models for the investigation of confined surfactants. Their properties are studied by a combination of solid-state NMR and relaxometry with other physicochemical techniques and molecular dynamics techniques. It is shown that this combination delivers unique insights into the structure, arrangement, dynamical properties and the guest-host interactions inside the confinement.
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Affiliation(s)
- Gerd Buntkowsky
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie , Technische Universität Darmstadt , Alarich-Weiss-Str. 8 , D-64287 Darmstadt , Germany
| | - Sonja Döller
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie , Technische Universität Darmstadt , Alarich-Weiss-Str. 8 , D-64287 Darmstadt , Germany
| | - Nadia Haro-Mares
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie , Technische Universität Darmstadt , Alarich-Weiss-Str. 8 , D-64287 Darmstadt , Germany
| | - Torsten Gutmann
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie , Technische Universität Darmstadt , Alarich-Weiss-Str. 8 , D-64287 Darmstadt , Germany
| | - Markus Hoffmann
- Department of Chemistry and Biochemistry , State University of New York College at Brockport , Brockport , NY , 14420 , USA
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Buntkowsky G, Vogel M. Small Molecules, Non-Covalent Interactions, and Confinement. Molecules 2020; 25:E3311. [PMID: 32708283 PMCID: PMC7397022 DOI: 10.3390/molecules25143311] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 07/07/2020] [Accepted: 07/15/2020] [Indexed: 11/27/2022] Open
Abstract
This review gives an overview of current trends in the investigation of small guest molecules, confined in neat and functionalized mesoporous silica materials by a combination of solid-state NMR and relaxometry with other physico-chemical techniques. The reported guest molecules are water, small alcohols, and carbonic acids, small aromatic and heteroaromatic molecules, ionic liquids, and surfactants. They are taken as characteristic role-models, which are representatives for the typical classes of organic molecules. It is shown that this combination delivers unique insights into the structure, arrangement, dynamics, guest-host interactions, and the binding sites in these confined systems, and is probably the most powerful analytical technique to probe these systems.
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Affiliation(s)
- Gerd Buntkowsky
- Institut für Physikalische Chemie, Technische Universität Darmstadt, 64287 Darmstadt, Germany
| | - Michael Vogel
- Institut für Festkörperphysik, Technische Universität Darmstadt, 64295 Darmstadt, Germany
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Brodrecht M, Kumari B, Thankamony ASSL, Breitzke H, Gutmann T, Buntkowsky G. Structural Insights into Peptides Bound to the Surface of Silica Nanopores. Chemistry 2019; 25:5214-5221. [DOI: 10.1002/chem.201805480] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Martin Brodrecht
- Institut für Physikalische ChemieTechnische Universität Darmstadt 64287 Darmstadt Germany
| | - Bharti Kumari
- Institut für Physikalische ChemieTechnische Universität Darmstadt 64287 Darmstadt Germany
| | | | - Hergen Breitzke
- Institut für Physikalische ChemieTechnische Universität Darmstadt 64287 Darmstadt Germany
| | - Torsten Gutmann
- Institut für Physikalische ChemieTechnische Universität Darmstadt 64287 Darmstadt Germany
| | - Gerd Buntkowsky
- Institut für Physikalische ChemieTechnische Universität Darmstadt 64287 Darmstadt Germany
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Veena VS, Illath K, Lazar A, Vinod CP, Ajithkumar TG, Jayanthi S. Distribution of water in the pores of periodic mesoporous organosilicates – a proton solid state MAS NMR study. Phys Chem Chem Phys 2018; 20:29351-29361. [DOI: 10.1039/c8cp04902e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Proposed model of water layers and pore filling in ethane substituted periodic mesoporous organosilicates (PMOE) based on analysis of solid state magic angle spinning (MAS) proton NMR spectra.
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Affiliation(s)
- V. S. Veena
- Department of Physics
- Indian Institute of Space Science and Technology
- Thiruvananthapuram 695 547
- India
| | - Kavya Illath
- Central NMR Facility and Physical and Materials Chemistry Division
- CSIR-National Chemical Laboratory
- Pune
- India
| | - Anish Lazar
- Catalysis and Inorganic Chemistry Division
- CSIR-National Chemical Laboratory
- Pune
- India
| | - C. P. Vinod
- Catalysis and Inorganic Chemistry Division
- CSIR-National Chemical Laboratory
- Pune
- India
| | - T. G. Ajithkumar
- Central NMR Facility and Physical and Materials Chemistry Division
- CSIR-National Chemical Laboratory
- Pune
- India
| | - S. Jayanthi
- Department of Physics
- Indian Institute of Space Science and Technology
- Thiruvananthapuram 695 547
- India
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Gangoda ME, Wijekoon A, Gregory RB, Khitrin AK. Multinuclear nuclear magnetic resonance spectroscopic and high-performance liquid chromatographic characterization of silica, grafted with specifically deuterated 4-((propylamino)methyl)benzoic acid. J Chromatogr A 2016; 1458:90-8. [DOI: 10.1016/j.chroma.2016.06.062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2016] [Revised: 06/16/2016] [Accepted: 06/18/2016] [Indexed: 11/15/2022]
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Werner M, Heil A, Rothermel N, Breitzke H, Groszewicz PB, Thankamony AS, Gutmann T, Buntkowsky G. Synthesis and solid state NMR characterization of novel peptide/silica hybrid materials. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2015; 72:73-78. [PMID: 26411982 DOI: 10.1016/j.ssnmr.2015.09.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Revised: 09/10/2015] [Accepted: 09/11/2015] [Indexed: 06/05/2023]
Abstract
The successful synthesis and solid state NMR characterization of silica-based organic-inorganic hybrid materials is presented. For this, collagen-like peptides are immobilized on carboxylate functionalized mesoporous silica (COOH/SiOx) materials. A pre-activation of the silica material with TSTU (O-(N-Succinimidyl)-N,N,N',N'-tetramethyluronium tetrafluoroborate) is performed to enable a covalent binding of the peptides to the linker. The success of the covalent immobilization is indicated by the decrease of the (13)C CP-MAS NMR signal of the TSTU moiety. A qualitative distinction between covalently bound and adsorbed peptide is feasible by (15)N CP-MAS Dynamic Nuclear Polarization (DNP). The low-field shift of the (15)N signal of the peptide's N-terminus clearly identifies it as the binding site. The DNP enhancement allows the probing of natural abundance (15)N nuclei, rendering expensive labeling of peptides unnecessary.
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Affiliation(s)
- Mayke Werner
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Technical University of Darmstadt, Alarich-Weiss-Straße 4, D-64287 Darmstadt, Germany
| | - Andreas Heil
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Technical University of Darmstadt, Alarich-Weiss-Straße 4, D-64287 Darmstadt, Germany
| | - Niels Rothermel
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Technical University of Darmstadt, Alarich-Weiss-Straße 4, D-64287 Darmstadt, Germany
| | - Hergen Breitzke
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Technical University of Darmstadt, Alarich-Weiss-Straße 4, D-64287 Darmstadt, Germany
| | - Pedro Braga Groszewicz
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Technical University of Darmstadt, Alarich-Weiss-Straße 4, D-64287 Darmstadt, Germany
| | - Aany Sofia Thankamony
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Technical University of Darmstadt, Alarich-Weiss-Straße 4, D-64287 Darmstadt, Germany
| | - Torsten Gutmann
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Technical University of Darmstadt, Alarich-Weiss-Straße 4, D-64287 Darmstadt, Germany.
| | - Gerd Buntkowsky
- Eduard-Zintl-Institute of Inorganic and Physical Chemistry, Technical University of Darmstadt, Alarich-Weiss-Straße 4, D-64287 Darmstadt, Germany.
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Carlsson N, Gustafsson H, Thörn C, Olsson L, Holmberg K, Åkerman B. Enzymes immobilized in mesoporous silica: a physical-chemical perspective. Adv Colloid Interface Sci 2014; 205:339-60. [PMID: 24112562 DOI: 10.1016/j.cis.2013.08.010] [Citation(s) in RCA: 141] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Revised: 08/27/2013] [Accepted: 08/28/2013] [Indexed: 01/13/2023]
Abstract
Mesoporous materials as support for immobilized enzymes have been explored extensively during the last two decades, primarily not only for biocatalysis applications, but also for biosensing, biofuels and enzyme-controlled drug delivery. The activity of the immobilized enzymes inside the pores is often different compared to that of the free enzymes, and an important challenge is to understand how the immobilization affects the enzymes in order to design immobilization conditions that lead to optimal enzyme activity. This review summarizes methods that can be used to understand how material properties can be linked to changes in enzyme activity. Real-time monitoring of the immobilization process and techniques that demonstrate that the enzymes are located inside the pores is discussed by contrasting them to the common practice of indirectly measuring the depletion of the protein concentration or enzyme activity in the surrounding bulk phase. We propose that pore filling (pore volume fraction occupied by proteins) is the best standard for comparing the amount of immobilized enzymes at the molecular level, and present equations to calculate pore filling from the more commonly reported immobilized mass. Methods to detect changes in enzyme structure upon immobilization and to study the microenvironment inside the pores are discussed in detail. Combining the knowledge generated from these methodologies should aid in rationally designing biocatalyst based on enzymes immobilized in mesoporous materials.
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Affiliation(s)
- Nils Carlsson
- Chalmers University of Technology, Department of Chemical and Biological Engineering, Physical Chemistry, 412 96 Gothenburg, Sweden
| | - Hanna Gustafsson
- Chalmers University of Technology, Department of Chemical and Biological Engineering, Applied Surface Chemistry, 412 96 Gothenburg, Sweden
| | - Christian Thörn
- Chalmers University of Technology, Department of Chemical and Biological Engineering, Industrial Biotechnology, 412 96 Gothenburg, Sweden
| | - Lisbeth Olsson
- Chalmers University of Technology, Department of Chemical and Biological Engineering, Industrial Biotechnology, 412 96 Gothenburg, Sweden
| | - Krister Holmberg
- Chalmers University of Technology, Department of Chemical and Biological Engineering, Applied Surface Chemistry, 412 96 Gothenburg, Sweden.
| | - Björn Åkerman
- Chalmers University of Technology, Department of Chemical and Biological Engineering, Physical Chemistry, 412 96 Gothenburg, Sweden
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Werner M, Rothermel N, Breitzke H, Gutmann T, Buntkowsky G. Recent Advances in Solid State NMR of Small Molecules in Confinement. Isr J Chem 2014. [DOI: 10.1002/ijch.201300095] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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