1
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Rampratap P, Lasorsa A, Arunachalam A, Kamperman M, Walvoort MTC, van der Wel PCA. Resolving Atomic-Level Dynamics and Interactions of High-Molecular-Weight Hyaluronic Acid by Multidimensional Solid-State NMR. ACS APPLIED MATERIALS & INTERFACES 2024; 16:43317-43328. [PMID: 39121380 PMCID: PMC11345730 DOI: 10.1021/acsami.4c08428] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2024] [Revised: 07/12/2024] [Accepted: 08/02/2024] [Indexed: 08/11/2024]
Abstract
High-molecular-weight (HMW) hyaluronic acid (HA) is a highly abundant natural polysaccharide and a fundamental component of the extracellular matrix (ECM). Its size and concentration regulate tissues' macro- and microenvironments, and its upregulation is a hallmark feature of certain tumors. Yet, the conformational dynamics of HMW-HA and how it engages with the components of the ECM microenvironment remain poorly understood at the molecular level. Probing the molecular structure and dynamics of HMW polysaccharides in a hydrated, physiological-like environment is crucial and also technically challenging. Here, we deploy advanced magic-angle spinning (MAS) solid-state NMR spectroscopy in combination with isotopic enrichment to enable an in-depth study of HMW-HA to address this challenge. This approach resolves multiple coexisting HA conformations and dynamics as a function of environmental conditions. By combining 13C-labeled HA with unlabeled ECM components, we detect by MAS NMR HA-specific changes in global and local conformational dynamics as a consequence of hydration and ECM interactions. These measurements reveal atom-specific variations in the dynamics and structure of the N-acetylglucosamine moiety of HA. We discuss possible implications for interactions that stabilize the structure of HMW-HA and facilitate its recognition by HA-binding proteins. The described methods apply similarly to the studies of the molecular structure and dynamics of HA in tumor contexts and in other biological tissues as well as HMW-HA hydrogels and nanoparticles used for biomedical and/or pharmaceutical applications.
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Affiliation(s)
- Pushpa Rampratap
- Zernike
Institute for Advanced Materials, University
of Groningen, Nijenborgh 4, Groningen 9747 AG, The Netherlands
| | - Alessia Lasorsa
- Zernike
Institute for Advanced Materials, University
of Groningen, Nijenborgh 4, Groningen 9747 AG, The Netherlands
| | - Abinaya Arunachalam
- Zernike
Institute for Advanced Materials, University
of Groningen, Nijenborgh 4, Groningen 9747 AG, The Netherlands
| | - Marleen Kamperman
- Zernike
Institute for Advanced Materials, University
of Groningen, Nijenborgh 4, Groningen 9747 AG, The Netherlands
| | - Marthe T. C. Walvoort
- Stratingh
Institute for Chemistry, University of Groningen, Nijenborgh 7, Groningen 9747 AG, The Netherlands
| | - Patrick C. A. van der Wel
- Zernike
Institute for Advanced Materials, University
of Groningen, Nijenborgh 4, Groningen 9747 AG, The Netherlands
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2
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Feldmann KO, Wiegand T, Ren J, Eckert H, Breternitz J, Groh MF, Müller U, Ruck M, Maryasin B, Ochsenfeld C, Schön O, Karaghiosoff K, Weigand JJ. [P3Se4](+): A Binary Phosphorus-Selenium Cation. Chemistry 2015; 21:9697-712. [PMID: 25960373 DOI: 10.1002/chem.201406476] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2014] [Indexed: 11/07/2022]
Abstract
Although a fairly large number of binary group 15/16 element cations have been reported, no example involving phosphorus in combination with a group 16 element has been synthesized and characterized to date. In this contribution is reported the synthesis and structural characterization of the first example of such a cation, namely a nortricyclane-type [P3Se4](+). This cation has been independently discovered by three groups through three different synthetic routes, as described herein. The molecular and electronic structure of the [P3Se4](+) cage and its crystal properties in the solid state have been characterized comprehensively by using X-ray diffraction, Raman, and nuclear magnetic resonance spectroscopies, as well as quantum chemical calculations.
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Affiliation(s)
- Kai-Oliver Feldmann
- Department of Chemistry and Food Chemistry, TU Dresden, 01062 Dresden (Germany)
| | - Thomas Wiegand
- Department of Physical Chemistry, Westfälische Wilhelms-University Münster, 48149 Münster (Germany). .,Laboratorium für Physikalische Chemie, ETH Zürich, Vladimir-Prelog-Weg 2, 8093 Zürich (Switzerland).
| | - Jinjun Ren
- Department of Physical Chemistry, Westfälische Wilhelms-University Münster, 48149 Münster (Germany)
| | - Hellmut Eckert
- Department of Physical Chemistry, Westfälische Wilhelms-University Münster, 48149 Münster (Germany). .,Institute of Physics in Sao Carlos, University of Sao Paulo, Sao Carlos, SP 13560-970, Brazil.
| | - Joachim Breternitz
- Department of Chemistry and Food Chemistry, TU Dresden, 01062 Dresden (Germany)
| | - Matthias F Groh
- Department of Chemistry and Food Chemistry, TU Dresden, 01062 Dresden (Germany)
| | - Ulrike Müller
- Department of Chemistry and Food Chemistry, TU Dresden, 01062 Dresden (Germany)
| | - Michael Ruck
- Department of Chemistry and Food Chemistry, TU Dresden, 01062 Dresden (Germany).
| | - Boris Maryasin
- Department of Chemistry, University of Munich (LMU), 81377 Munich (Germany)
| | | | - Oliver Schön
- Department of Chemistry, University of Munich (LMU), 81377 Munich (Germany)
| | | | - Jan J Weigand
- Department of Chemistry and Food Chemistry, TU Dresden, 01062 Dresden (Germany).
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3
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Reddy YJ, Ramanathan KV. Assignment of the (13)C NMR spectrum by correlation to dipolar coupled proton-pairs and estimation of order parameters of a thiophene based liquid crystal. Phys Chem Chem Phys 2015; 17:1450-7. [PMID: 25429708 DOI: 10.1039/c4cp04782f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Materials with widely varying molecular topologies and exhibiting liquid crystalline properties have attracted considerable attention in recent years. (13)C NMR spectroscopy is a convenient method for studying such novel systems. In this approach the assignment of the spectrum is the first step which is a non-trivial problem. Towards this end, we propose here a method that enables the carbon skeleton of the different sub-units of the molecule to be traced unambiguously. The proposed method uses a heteronuclear correlation experiment to detect pairs of nearby carbons with attached protons in the liquid crystalline core through correlation of the carbon chemical shifts to the double-quantum coherences of protons generated through the dipolar coupling between them. Supplemented by experiments that identify non-protonated carbons, the method leads to a complete assignment of the spectrum. We initially apply this method for assigning the (13)C spectrum of the liquid crystal 4-n-pentyl-4'-cyanobiphenyl oriented in the magnetic field. We then utilize the method to assign the aromatic carbon signals of a thiophene based liquid crystal thereby enabling the local order-parameters of the molecule to be estimated and the mutual orientation of the different sub-units to be obtained.
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Affiliation(s)
- Y Jayasubba Reddy
- NMR Research Centre, Indian Institute of Science, Bangalore 560012, India.
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4
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Haouas M, Mbomekallé IM, Vila N, de Oliveira P, Taulelle F. 183W INADEQUATE 2D NMR Spectroscopy of Hetero Arsenato–Phosphato–Tungstate PV/AsV Substitution in Dawson-Type α-[AsxP2–xW18O62]6– (x = 0–2) and α-[H4AsyP1–yW18O62]7– (y = 0, 1). Inorg Chem 2014; 53:5568-74. [DOI: 10.1021/ic500286v] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Mohamed Haouas
- Tectospin, Institut Lavoisier de Versailles, 78035 Versailles Cedex, France
| | - Israël-Martyr Mbomekallé
- Groupe Solides Moléculaires, Institut Lavoisier de Versailles, 78035 Versailles Cedex, France
- Laboratoire de Chimie Physique, UMR 8000, CNRS,
Equipe d’Electrochimie et de Photo-électrochimie, Université Paris-Sud Bâtiment 350, 91405 Orsay Cedex, France
| | - Neus Vila
- Groupe Solides Moléculaires, Institut Lavoisier de Versailles, 78035 Versailles Cedex, France
| | - Pedro de Oliveira
- Laboratoire de Chimie Physique, UMR 8000, CNRS,
Equipe d’Electrochimie et de Photo-électrochimie, Université Paris-Sud Bâtiment 350, 91405 Orsay Cedex, France
| | - Francis Taulelle
- Tectospin, Institut Lavoisier de Versailles, 78035 Versailles Cedex, France
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5
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Ray GJ, Ravenscroft N, Siekmann J, Zhang Z, Sanders P, Shaligram U, Szabo CM, Kosma P. Complete structural elucidation of an oxidized polysialic acid drug intermediate by nuclear magnetic resonance spectroscopy. Bioconjug Chem 2014; 25:665-76. [PMID: 24679150 DOI: 10.1021/bc400456g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Polysialic acid (PSA) is a high molecular weight glycan composed of repeat units of α(2→8) linked 5-N-acetyl-neuraminic acid. Mild periodate oxidation of PSA selectively targets the end sialic acid ring containing three adjacent alcohols generating a putative aldehyde, which can be used for terminal attachment of PSA to therapeutic proteins. The work presented here permitted complete NMR peak assignments of not only the repeat units, but also the two terminal units at each end of oxidized PSA, an intermediate, which can be used to improve drug performance. The assignments were made using a variety of NMR techniques on oligomers of sialic acid as well as oxidized PSA with molecular masses of 4 and 20 kDa. This enabled structure elucidation that showed the actual moiety formed was not the expected aldehyde or its hydrate, but is a hemiacetal between the oxidation site on the terminal sialic acid ring and the penultimate ring. The existence of a hemiacetal structure has major implications on stability, reactivity, and conjugation chemistry of oxidized PSA. The assignment process also revealed deuterium exchange of the axial hydrogen at the 3- (methylene) position of the ring, which was in agreement with the literature.
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Affiliation(s)
- G Joseph Ray
- Baxter Healthcare Corporation , Round Lake, 60073, Illinois, United States
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6
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Wiegand T, Eckert H, Ren J, Brunklaus G, Fröhlich R, Daniliuc CG, Lübbe G, Bussmann K, Kehr G, Erker G, Grimme S. Indirect “No-Bond” 31P···31P Spin–Spin Couplings in P,P-[3]Ferrocenophanes: Insights from Solid-State NMR Spectroscopy and DFT Calculations. J Phys Chem A 2014; 118:2316-31. [DOI: 10.1021/jp500172b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Thomas Wiegand
- Institut
für Physikalische Chemie and Graduate School of Chemistry, WWU Münster, Corrensstrasse 30, D 48149 Münster, Germany
| | - Hellmut Eckert
- Institut
für Physikalische Chemie and Graduate School of Chemistry, WWU Münster, Corrensstrasse 30, D 48149 Münster, Germany
| | - Jinjun Ren
- Institut
für Physikalische Chemie and Graduate School of Chemistry, WWU Münster, Corrensstrasse 30, D 48149 Münster, Germany
| | - Gunther Brunklaus
- Institut
für Physikalische Chemie and Graduate School of Chemistry, WWU Münster, Corrensstrasse 30, D 48149 Münster, Germany
| | - Roland Fröhlich
- Organisch-Chemisches
Institut, WWU Münster, Corrensstrasse 40, D 48149 Münster, Germany
| | | | - Gerrit Lübbe
- Organisch-Chemisches
Institut, WWU Münster, Corrensstrasse 40, D 48149 Münster, Germany
| | - Kathrin Bussmann
- Organisch-Chemisches
Institut, WWU Münster, Corrensstrasse 40, D 48149 Münster, Germany
| | - Gerald Kehr
- Organisch-Chemisches
Institut, WWU Münster, Corrensstrasse 40, D 48149 Münster, Germany
| | - Gerhard Erker
- Organisch-Chemisches
Institut, WWU Münster, Corrensstrasse 40, D 48149 Münster, Germany
| | - Stefan Grimme
- Mulliken
Center for Theoretical Chemistry, Institut für Physikalische
und Theoretische Chemie, Universität Bonn, Beringstrasse 4, D 53155 Bonn, Germany
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7
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Dufour C, Wink J, Kurz M, Kogler H, Olivan H, Sablé S, Heyse W, Gerlitz M, Toti L, Nußer A, Rey A, Couturier C, Bauer A, Brönstrup M. Isolation and Structural Elucidation of Armeniaspirols A-C: Potent Antibiotics against Gram-Positive Pathogens. Chemistry 2012; 18:16123-8. [DOI: 10.1002/chem.201201635] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2012] [Indexed: 02/04/2023]
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8
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Coffman KC, Hartley TP, Dallas JL, Kurth MJ. Isoxazolodihydropyridinones: 1,3-dipolar cycloaddition of nitrile oxides onto 2,4-dioxopiperidines. ACS COMBINATORIAL SCIENCE 2012; 14:280-4. [PMID: 22352295 DOI: 10.1021/co200200u] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Practical and efficient methods have been developed for the diversity-oriented synthesis of isoxazolodihydropyridinones via the 1,3-dipolar cycloaddition of nitrile oxides onto 2,4-dioxopiperidines. A select few of these isoxazolodihydropyridinones were further elaborated with triazoles by copper-catalyzed azide-alkyne cycloaddition reactions. A total of 70 compounds and intermediates were synthesized and analyzed for drug likeness. Sixty-four of these novel compounds were submitted to the NIH Molecular Libraries Small Molecule Repository for high-throughput biological screening.
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Affiliation(s)
- Keith C. Coffman
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616,
United States
| | - Timothy P. Hartley
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616,
United States
| | - Jerry L. Dallas
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616,
United States
| | - Mark J. Kurth
- Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616,
United States
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9
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Dupke S, Langer T, Pöttgen R, Winter M, Eckert H. Structural and dynamic characterization of Li(12)Si(7) and Li(12)Ge(7) using solid state NMR. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2012; 42:17-25. [PMID: 21996453 DOI: 10.1016/j.ssnmr.2011.09.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2011] [Revised: 09/15/2011] [Accepted: 09/17/2011] [Indexed: 05/31/2023]
Abstract
Local environments and lithium ion dynamics in the binary lithium silicide Li(12)Si(7), and the analogous germanium compound have been characterized by detailed (6)Li, (7)Li, and (29)Si variable temperature static and magic-angle spinning (MAS) NMR experiments. In the MAS-NMR spectra, individual lithium sites are generally well-resolved at temperatures below 200K, whereas at higher temperatures partial site averaging is observed on the kHz timescale. The observed lithium chemical shift ranges of up to 60 ppm indicate a significant amount of electronic charge stored on the lithium species, consistent with the expectation of the extended Zintl-Klemm-Bussmann concept used for the theoretical description of lithium silicides. Furthermore the strongly diamagnetic chemical shifts observed for the lithium ions situated directly above the five-membered Si(5) rings suggest the possibility of aromatic ring currents in these structural elements. This assignment is confirmed further by (29)Si{(7)Li} CPMAS-heteronuclear correlation experiments. The (29)Si MAS-NMR spectra of Li(12)Si(7), aided by 2-D J-resolved spectroscopy, are well suited for differentiating between the individual sites within the silicon framework, while further detailed connectivity information is available on the basis of 2-D INADEQUATE and radio frequency driven recoupling (RFDR) spectra. Variable temperature static (7)Li NMR spectra reveal the onset of strong motional narrowing effects, illustrating high lithium ionic mobilities in both of these compounds.
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Affiliation(s)
- Sven Dupke
- Institute of Physical Chemistry, WWU Münster, Corrensstrasse 28/30, 48149 Münster, Germany
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10
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Bain AD, Hughes DW, Anand CK, Nie Z, Robertson VJ. Problems, artifacts and solutions in the INADEQUATE NMR experiment. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2010; 48:630-641. [PMID: 20589732 DOI: 10.1002/mrc.2639] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The INADEQUATE experiment can provide unequalled, detailed information about the carbon skeleton of an organic molecule. However, it also has the reputation of requiring unreasonable amounts of sample. Modern spectrometers and probes have mitigated this problem, and it is now possible to get good structural data on a few milligrams of a typical organic small molecule. In this paper, we analyze the experiment step by step in some detail, to show how each part of the sequence can both contribute to maximum overall sensitivity and can lead to artifacts. We illustrate these methods on three molecules: 1-octanol, the steroid 17alpha-ethynylestradiol and the isoquinoline alkaloid beta-hydrastine. In particular, we show that not only is the standard experiment powerful, but also a version tuned to small couplings can contribute vital structural information on long-range connectivities. If the delay in the spin echo is long, pairs of carbons with small couplings can create significant double-quantum coherence and show correlations in the spectrum. These are two- and three-bond correlations in a carbon chain or through a heteroatom in the molecule. All these mean that INADEQUATE can play a viable and important role in routine organic structure determination.
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Affiliation(s)
- Alex D Bain
- Department of Chemistry and Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4M1.
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11
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Intelmann D, Kummerlöwe G, Haseleu G, Desmer N, Schulze K, Fröhlich R, Frank O, Luy B, Hofmann T. Structures of Storage-Induced Transformation Products of the Beerâs Bitter Principles, Revealed by Sophisticated NMR Spectroscopic and LCâMS Techniques. Chemistry 2009; 15:13047-58. [DOI: 10.1002/chem.200902058] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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12
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Orza RA, Magusin PCMM, Litvinov VM, van Duin M, Michels MAJ. Mechanism for Peroxide Cross-Linking of EPDM Rubber from MAS 13C NMR Spectroscopy. Macromolecules 2009. [DOI: 10.1021/ma9016482] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- R. A. Orza
- Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
- Dutch Polymer Institute, P.O. Box 902, 5600 AX Eindhoven, The Netherlands
| | - P. C. M. M. Magusin
- Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - V. M. Litvinov
- Dutch Polymer Institute, P.O. Box 902, 5600 AX Eindhoven, The Netherlands
- DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands
| | - M. van Duin
- DSM Elastomers Global R&D, P.O. Box 1130, 6160 BC Geleen, The Netherlands
| | - M. A. J. Michels
- Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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13
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Zhou Z, Kümmerle R, Stevens JC, Redwine D, He Y, Qiu X, Cong R, Klosin J, Montañez N, Roof G. 13C NMR of polyolefins with a new high temperature 10 mm cryoprobe. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2009; 200:328-333. [PMID: 19665405 DOI: 10.1016/j.jmr.2009.07.017] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2009] [Revised: 07/14/2009] [Accepted: 07/15/2009] [Indexed: 05/28/2023]
Abstract
Recently, a high temperature 10 mm cryoprobe was developed. This probe provides a significant sensitivity enhancement for (13)C NMR of polyolefins at a sample temperature of 120-135 degrees C, as compared to conventional probes. This greatly increases the speed of NMR studies of comonomer content, sequence distribution, stereo- and regioerrors, saturated chain end, unsaturation, and diffusion of polymers. In this contribution, we first compare the (13)C NMR sensitivity of this probe with conventional probes. Then, we demonstrate one of the advantages of this probe in its ability to perform 2D Incredible Natural Abundance Double Quantum Transfer Experiment (2D INADEQUATE) in a relatively short period of time. The 2D INADEQUATE has been rarely used for polymer studies because of its inherently very low sensitivity. It becomes even more challenging for studying infrequent polyolefin microstructures, as low probability microstructures represent a small fraction of carbons in the sample. Here, the 2D INADEQUATE experiment was used to assign the (13)C NMR peaks of 2,1-insertion regioerrors in a poly(propylene-co-1-octene) copolymer.
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Affiliation(s)
- Zhe Zhou
- The Dow Chemical Company, Freeport, TX 77541, USA.
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14
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Zhou Z, Stevens JC, Klosin J, Kümmerle R, Qiu X, Redwine D, Cong R, Taha A, Mason J, Winniford B, Chauvel P, Montañez N. NMR Study of Isolated 2,1-Inverse Insertion in Isotactic Polypropylene. Macromolecules 2009. [DOI: 10.1021/ma802770f] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zhe Zhou
- Dow Chemical Company, Freeport, Texas 77541; Dow Chemical Company, Midland, Michigan 48667; Bruker BioSpin AG, CH-8117 Fällanden, Switzerland; and Kelly, Freeport, Texas 77541
| | - James C. Stevens
- Dow Chemical Company, Freeport, Texas 77541; Dow Chemical Company, Midland, Michigan 48667; Bruker BioSpin AG, CH-8117 Fällanden, Switzerland; and Kelly, Freeport, Texas 77541
| | - Jerzy Klosin
- Dow Chemical Company, Freeport, Texas 77541; Dow Chemical Company, Midland, Michigan 48667; Bruker BioSpin AG, CH-8117 Fällanden, Switzerland; and Kelly, Freeport, Texas 77541
| | - Rainer Kümmerle
- Dow Chemical Company, Freeport, Texas 77541; Dow Chemical Company, Midland, Michigan 48667; Bruker BioSpin AG, CH-8117 Fällanden, Switzerland; and Kelly, Freeport, Texas 77541
| | - Xiaohua Qiu
- Dow Chemical Company, Freeport, Texas 77541; Dow Chemical Company, Midland, Michigan 48667; Bruker BioSpin AG, CH-8117 Fällanden, Switzerland; and Kelly, Freeport, Texas 77541
| | - David Redwine
- Dow Chemical Company, Freeport, Texas 77541; Dow Chemical Company, Midland, Michigan 48667; Bruker BioSpin AG, CH-8117 Fällanden, Switzerland; and Kelly, Freeport, Texas 77541
| | - Rongjuan Cong
- Dow Chemical Company, Freeport, Texas 77541; Dow Chemical Company, Midland, Michigan 48667; Bruker BioSpin AG, CH-8117 Fällanden, Switzerland; and Kelly, Freeport, Texas 77541
| | - Angela Taha
- Dow Chemical Company, Freeport, Texas 77541; Dow Chemical Company, Midland, Michigan 48667; Bruker BioSpin AG, CH-8117 Fällanden, Switzerland; and Kelly, Freeport, Texas 77541
| | - Jeff Mason
- Dow Chemical Company, Freeport, Texas 77541; Dow Chemical Company, Midland, Michigan 48667; Bruker BioSpin AG, CH-8117 Fällanden, Switzerland; and Kelly, Freeport, Texas 77541
| | - Bill Winniford
- Dow Chemical Company, Freeport, Texas 77541; Dow Chemical Company, Midland, Michigan 48667; Bruker BioSpin AG, CH-8117 Fällanden, Switzerland; and Kelly, Freeport, Texas 77541
| | - Paul Chauvel
- Dow Chemical Company, Freeport, Texas 77541; Dow Chemical Company, Midland, Michigan 48667; Bruker BioSpin AG, CH-8117 Fällanden, Switzerland; and Kelly, Freeport, Texas 77541
| | - Nikki Montañez
- Dow Chemical Company, Freeport, Texas 77541; Dow Chemical Company, Midland, Michigan 48667; Bruker BioSpin AG, CH-8117 Fällanden, Switzerland; and Kelly, Freeport, Texas 77541
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15
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Aoyagi A, Ito-Kobayashi M, Ono Y, Furukawa Y, Takahashi M, Muramatsu Y, Umetani M, Takatsu T. Colletoic Acid, a Novel 11β-Hydroxysteroid Dehydrogenase Type 1 Inhibitor from Colletotrichum gloeosporioides SANK 21404. J Antibiot (Tokyo) 2008; 61:136-41. [DOI: 10.1038/ja.2008.122] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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Jin L, Uhrín D. 13C-detected IPAP-INADEQUATE for simultaneous measurement of one-bond and long-range scalar or residual dipolar coupling constants. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2007; 45:628-33. [PMID: 17559162 DOI: 10.1002/mrc.2031] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The sensitivity of cryoprobes, which are rapidly becoming available, means that the measurement of coupling constants involving 13C, 13C pairs at the natural abundance of 13C can now, in principle, be done by using tens rather then hundreds of milligrams of compounds. However, a robust method that would yield reliable values of small long-range carbon--carbon coupling constants is still missing. In this Communication, we describe a novel 13C-detected incredible natural-abundance double-quantum transfer experiment (INADEQUATE) experiment for simultaneous correlation of one-bond and long-range 13C- 13C pairs and the measurement of both types of coupling constants in 13C natural abundance samples. This method yields accurate values of one-bond and long-range coupling constants by manipulation of pure phase in-phase (IP) and antiphase (AP) doublets, and is referred to as 13C-detected IPAP-INADEQUATE. It is illustrated by the measurement of interglycosidic (3)J(CCOC) coupling constants in a disaccharide molecule providing important information about the conformation of the glycosidic linkage. Owing to the simplicity of INADEQUATE spectra the carbon-carbon coupling constants are particularly suitable for studies of partially oriented molecules through the measurement of carbon-carbon residual dipolar couplings (RDCs). An example of this approach is presented. We expect the method to find a variety of applications in the conformational analysis of small molecules, determination of diastereoisomers and enantiomers, and studies of molecules in aligned media.
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Affiliation(s)
- Lan Jin
- School of Chemistry, University of Edinburgh, West Mains Road, Edinburgh, EH9 3JJ, UK
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Haouas M, Taulelle F. Revisiting the identification of structural units in aqueous silicate solutions by two-dimensional silicon-29 INADEQUATE. J Phys Chem B 2007; 110:3007-14. [PMID: 16494302 DOI: 10.1021/jp0557823] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
(29)Si-(29)Si INADEQUATE experiments have been successfully used on sodium aqueous silicate partially enriched (19% of (29)Si isotope) solutions in order to gain connectivity information and to help in spectral assignments. The structures of almost all known species from the literature were confirmed by this technique. Moreover, accurate scalar J couplings were extracted. The two-dimensional (2D) spectra demonstrated additional cross correlations for some Si-Si bonds never reported before, representing additional oligomeric species. They reveal five silicate cages with the following connectivity sets: Q(2)-Q(2)-Q(3) or Q(3Delta)-Q(3Delta)-Q(3) for one species, Q(2)-Q(2) or Q(3Delta)-Q(3Delta) for three species (Q(3Delta) indicates a three-connected silicon in a three-membered cycle), and Q(3)-Q(3) for one species. All possible molecular graphs for anions containing silicon up to 11 atoms, matching these sequential connnectivities, were enumerated. Additionally, a direct comparison between resonances observed in the 2D experiments with that obtained in the 1D spectrum allows us to assign single-sited silicate anions. Only a few species reported before were not detected, most probably due to their too low concentration in our solutions.
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Affiliation(s)
- Mohamed Haouas
- Tectospin, IREM, UMR CNRS 8637, Université de Versailles St-Quentin, 45, Avenue des Etats-Unis, 78035 Versailles Cedex, France.
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Bowyer PJ, Swanson AG, Morris GA. Randomized acquisition for the suppression of systematic F1 artifacts in two-dimensional NMR spectroscopy. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 1999; 140:513-515. [PMID: 10497061 DOI: 10.1006/jmre.1999.1882] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
2D spectra, particularly for homonuclear correlation, can show a variety of artifactual signals in the F1 domain. Common sources include carry-over of signal modulation from one transient to the next ("rapid pulsing artifacts") and systematic variations in room temperature ("parallel diagonals"). In both cases there is one very simple expedient which can greatly reduce the impact of these sources of error. Multidimensional data sets are almost invariably recorded by simply incrementing or decrementing evolution periods, largely for reasons of convenience and historical precedent. If instead the sampling of the evolution periods is carried out in random order, the perturbations responsible for the sharp F1 signals in the conventional experiment manifest themselves as t1 noise. Since the randomized acquisition redistributes coherent artifactual signals randomly in F1, the maximum artifactual signal is substantially reduced in the randomized experiment and no longer appears in the form of misleading distinct peaks.
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Affiliation(s)
- P J Bowyer
- Department of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom
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Merlet D, Ancian B, Courtieu J, Lesot P. Two-Dimensional Deuterium NMR Spectroscopy of Chiral Molecules Oriented in a Polypeptide Liquid Crystal: Applications for the Enantiomeric Analysis through Natural Abundance Deuterium NMR. J Am Chem Soc 1999. [DOI: 10.1021/ja9837699] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Denis Merlet
- Contribution from the Laboratoire de Chimie Structurale Organique, ICMO, ESA CNRS No. 8074, Université de Paris-Sud, 91405 Orsay Cedex, France, and Département de Chimie, Université Paris VII-Denis Diderot, 2 Place Jussieu, 75251 Paris Cedex 05, France
| | - Bernard Ancian
- Contribution from the Laboratoire de Chimie Structurale Organique, ICMO, ESA CNRS No. 8074, Université de Paris-Sud, 91405 Orsay Cedex, France, and Département de Chimie, Université Paris VII-Denis Diderot, 2 Place Jussieu, 75251 Paris Cedex 05, France
| | - Jacques Courtieu
- Contribution from the Laboratoire de Chimie Structurale Organique, ICMO, ESA CNRS No. 8074, Université de Paris-Sud, 91405 Orsay Cedex, France, and Département de Chimie, Université Paris VII-Denis Diderot, 2 Place Jussieu, 75251 Paris Cedex 05, France
| | - Philippe Lesot
- Contribution from the Laboratoire de Chimie Structurale Organique, ICMO, ESA CNRS No. 8074, Université de Paris-Sud, 91405 Orsay Cedex, France, and Département de Chimie, Université Paris VII-Denis Diderot, 2 Place Jussieu, 75251 Paris Cedex 05, France
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