1
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Sager E, Tzvetkova P, Lingel A, Gossert AD, Luy B. Hydrogen bond formation may enhance RDC-based discrimination of enantiomers. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2024; 62:639-647. [PMID: 38785031 DOI: 10.1002/mrc.5448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2024] [Revised: 03/28/2024] [Accepted: 04/08/2024] [Indexed: 05/25/2024]
Abstract
The distinction of enantiomers based on residual anisotropic parameters obtained by alignment in chiral poly-γ-benzyl-L-glutamate (PBLG) is among the strongest in high-resolution NMR spectroscopy. However, large variations in enantiodifferentiation among different solutes are frequently observed. One hypothesis is that the formation of hydrogen bonds between solute and PBLG is important for the distinction of enantiomers. With a small set of three almost spherical enantiomeric pairs, for which 1DCH residual dipolar couplings are measured, we address this issue in a systematic way: borneol contains a single functional group that can act as a hydrogen bond donor, camphor has a single group that may act as a hydrogen bond acceptor, and quinuclidinol can act as both hydrogen bond donor and acceptor. The results are unambiguous: although camphor shows low enantiodifferentiation with PBLG and alignment that can be predicted well by the purely steric TRAMITE approach, the distinction of enantiomers for the other enantiomeric pairs is significantly higher with alignment properties that must involve a specific interaction in addition to steric alignment.
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Affiliation(s)
- Emine Sager
- Institute of Organic Chemistry and Institute for Biological Interfaces 4-Magnetic Resonance, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany
- Novartis Biomedical Research, Basel, Switzerland
| | - Pavleta Tzvetkova
- Institute of Organic Chemistry and Institute for Biological Interfaces 4-Magnetic Resonance, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany
| | | | | | - Burkhard Luy
- Institute of Organic Chemistry and Institute for Biological Interfaces 4-Magnetic Resonance, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany
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2
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Jiang S, Zeng Q, Zhao K, Liu J, Sun Q, Huang K, He Y, Zhang X, Wang H, Shi X, Feng C, Deng X, Wei Y. Chirality Bias Tissue Homeostasis by Manipulating Immunological Response. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2105136. [PMID: 34601779 DOI: 10.1002/adma.202105136] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 09/15/2021] [Indexed: 06/13/2023]
Abstract
The physiological chirality of extracellular environments is substantially affected by pathological diseases. However, how this stereochemical variation drives host immunity remains poorly understood. Here, it is reported that pathology-mimetic M-nanofibrils-but not physiology-mimetic P-nanofibrils-act as a defense mechanism that helps to restore tissue homeostasis by manipulating immunological response. Quantitative multi-omics in vivo and in vitro shows that M-nanofibrils significantly inhibit inflammation and promote tissue regeneration by upregulating M2 macrophage polarization and downstream immune signaling compared with P-nanofibrils. Molecular analysis and theoretical simulation demonstrate that M-chirality displays higher stereo-affinity to cellular binding, which induces higher cellular contractile stress and activates mechanosensitive ion channel PIEZOl to conduct Ca2+ influx. In turn, the nuclear transfer of STAT is biased by Ca2+ influx to promote M2 polarization. These findings underscore the structural mechanisms of disease, providing design basis for immunotherapy with bionic functional materials.
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Affiliation(s)
- Shengjie Jiang
- Beijing Laboratory of Biomedical Materials, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Beijing, 100081, P. R. China
- Institute of Medical Technology, Peking University Health Science Center, Beijing, 100191, P. R. China
| | - Qiang Zeng
- Beijing Laboratory of Biomedical Materials, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Beijing, 100081, P. R. China
- Institute of Medical Technology, Peking University Health Science Center, Beijing, 100191, P. R. China
| | - Kai Zhao
- Beijing Laboratory of Biomedical Materials, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Beijing, 100081, P. R. China
- Institute of Medical Technology, Peking University Health Science Center, Beijing, 100191, P. R. China
| | - Jinying Liu
- Key Laboratory for Special Functional Materials of Ministry of Education, School of Materials Science and Engineering, Henan University, Kaifeng, 475004, P. R. China
| | - Qiannan Sun
- Beijing Laboratory of Biomedical Materials, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Beijing, 100081, P. R. China
- Institute of Medical Technology, Peking University Health Science Center, Beijing, 100191, P. R. China
| | - Kang Huang
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, Laboratory of Theoretical and Computational Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, P. R. China
| | - Ying He
- Beijing Laboratory of Biomedical Materials, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Beijing, 100081, P. R. China
- Institute of Medical Technology, Peking University Health Science Center, Beijing, 100191, P. R. China
| | - Xuehui Zhang
- Department of Dental Materials and Dental Medical Devices Testing Center, National Engineering Laboratory for Digital and Material Technology of Stomatology, Peking University School and Hospital of Stomatology, Beijing, 100081, P. R. China
| | - Hui Wang
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, Laboratory of Theoretical and Computational Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, P. R. China
| | - Xinghua Shi
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, Laboratory of Theoretical and Computational Nanoscience, CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, P. R. China
| | - Chuanliang Feng
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai, 200240, P. R. China
| | - Xuliang Deng
- Beijing Laboratory of Biomedical Materials, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Beijing, 100081, P. R. China
- Institute of Medical Technology, Peking University Health Science Center, Beijing, 100191, P. R. China
| | - Yan Wei
- Beijing Laboratory of Biomedical Materials, Department of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Beijing, 100081, P. R. China
- Institute of Medical Technology, Peking University Health Science Center, Beijing, 100191, P. R. China
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3
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Nath N, Bordoloi P, Barman B, Baishya B, Chaudhari SR. Insight into old and new pure shift nuclear magnetic resonance methods for enantiodiscrimination. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2018; 56:876-892. [PMID: 29411898 DOI: 10.1002/mrc.4719] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2017] [Revised: 01/20/2018] [Accepted: 01/23/2018] [Indexed: 06/08/2023]
Abstract
Enantiodiscrimination and their quantification using nuclear magnetic resonance (NMR) spectroscopy has always been a subject of great interest. Proton is the nucleus of choice for enantiodiscrimination due to its high sensitivity and ubiquitous presence in nature. Despite its advantages, enantiodiscrimination suffers from extensive signal splitting by the proton-proton scalar couplings, which give complex multiplets that spread over a frequency range of some tens of hertz. These multiplets often overlap, further complicating interpretation of the spectra and quantifications. In the present review, we discuss some of the recent developments in the pure shift 1 H NMR based methods for enantiomer resolution and enantiodiscrimination. We also compare various pure shift methods used for enantiodiscrimination and measurement of enantiomeric excess, considering the fact that conventional 1 H NMR fails to provide any detailed insight.
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Affiliation(s)
- Nilamoni Nath
- Department of Chemistry, Gauhati University, Guwahati, Assam, 781014, India
| | - Priyakshi Bordoloi
- Department of Chemistry, Gauhati University, Guwahati, Assam, 781014, India
| | - Bhaskar Barman
- Department of Chemistry, Gauhati University, Guwahati, Assam, 781014, India
| | - Bikash Baishya
- Centre of Biomedical Research, SGPGIMS Campus, Lucknow, Uttar Pradesh, 226014, India
| | - Sachin R Chaudhari
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
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4
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Reller M, Wesp S, Koos MRM, Reggelin M, Luy B. Biphasic Liquid Crystal and the Simultaneous Measurement of Isotropic and Anisotropic Parameters by Spatially Resolved NMR Spectroscopy. Chemistry 2017. [DOI: 10.1002/chem.201702126] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Malin Reller
- Institut für Organische Chemie and Institut für Biologische Grenzflächen 4 - Magnetische Resonanz; Karlsruher Institut für Technologie (KIT); Fritz-Haber-Weg 6 76131 Karlsruhe Germany
| | - Svenja Wesp
- Organische Chemie; Technische Universität Darmstadt; Alarich-Weiss Str. 4 64287 Darmstadt Germany
| | - Martin R. M. Koos
- Institut für Organische Chemie and Institut für Biologische Grenzflächen 4 - Magnetische Resonanz; Karlsruher Institut für Technologie (KIT); Fritz-Haber-Weg 6 76131 Karlsruhe Germany
| | - Michael Reggelin
- Organische Chemie; Technische Universität Darmstadt; Alarich-Weiss Str. 4 64287 Darmstadt Germany
| | - Burkhard Luy
- Institut für Organische Chemie and Institut für Biologische Grenzflächen 4 - Magnetische Resonanz; Karlsruher Institut für Technologie (KIT); Fritz-Haber-Weg 6 76131 Karlsruhe Germany
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5
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Serhan Z, Aroulanda C, Lesot P. Investigation of Solute-Fiber Affinity and Orientational Ordering of Norbornadiene Interacting with Two-Polypeptide Chiral Liquid Crystalline Solvents by Natural Abundance Deuterium (NAD) NMR. J Phys Chem A 2016; 120:6076-88. [DOI: 10.1021/acs.jpca.6b04254] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zeinab Serhan
- RMN en
Milieu Orienté,
ICMMO, UMR CNRS 8182, Université de Paris Sud/Université Paris-Saclay, Bât. 410, F-91405 Orsay cedex, France
| | - Christie Aroulanda
- RMN en
Milieu Orienté,
ICMMO, UMR CNRS 8182, Université de Paris Sud/Université Paris-Saclay, Bât. 410, F-91405 Orsay cedex, France
| | - Philippe Lesot
- RMN en
Milieu Orienté,
ICMMO, UMR CNRS 8182, Université de Paris Sud/Université Paris-Saclay, Bât. 410, F-91405 Orsay cedex, France
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6
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Koos MRM, Danieli E, Casanova F, Blümich B, Luy B. Differentiation of enantiomers by 2D NMR spectroscopy at 1 T using residual dipolar couplings. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2016; 54:527-530. [PMID: 25773020 DOI: 10.1002/mrc.4222] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Revised: 12/18/2014] [Accepted: 01/19/2015] [Indexed: 06/04/2023]
Abstract
Differentiating enantiomers using 2D bench-top NMR spectroscopy. Spectrometers working with permanent magnets at 1 T field strength allow the acquisition of 2D data sets. In conjunction with previously reported chiral alignment media, this setup allows the measurement of enantiomeric excess via residual dipolar couplings in stretched gelatine as a result of the reduced line width obtained by 2D J-resolved spectroscopy.
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Affiliation(s)
- Martin R M Koos
- Institut für Organische Chemie (IOC) and Institut für Biologische Grenzflächen (IBG), Karlsruher Institut für Technologie (KIT), Fritz-Haber-Weg 6, 76131, Karlsruhe, Germany
| | - Ernesto Danieli
- Institut für Technische und Makromolekulare Chemie (ITMC), Lehrstuhl für Makromolekulare Chemie, RWTH Aachen, Worringerweg 1, 52074, Aachen, Germany
| | | | - Bernhard Blümich
- Institut für Technische und Makromolekulare Chemie (ITMC), Lehrstuhl für Makromolekulare Chemie, RWTH Aachen, Worringerweg 1, 52074, Aachen, Germany
| | - Burkhard Luy
- Institut für Organische Chemie (IOC) and Institut für Biologische Grenzflächen (IBG), Karlsruher Institut für Technologie (KIT), Fritz-Haber-Weg 6, 76131, Karlsruhe, Germany
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7
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Tzvetkova P, Luy B. Q.E.COSY: determining sign and size of small deuterium residual quadrupolar couplings using an extended E.COSY principle. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2016; 54:351-357. [PMID: 26763050 DOI: 10.1002/mrc.4386] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 09/30/2015] [Accepted: 10/23/2015] [Indexed: 06/05/2023]
Abstract
Residual quadrupolar couplings contain important structural information comparable with residual dipolar couplings. However, the measurement of sign and size of especially small residual quadrupolar couplings is difficult. Here, we present an extension of the E.COSY principle to spin systems consisting of a Spin 1 coupled to a spin ½ nucleus, which allows the determination of the sign of the quadrupolar coupling of the Spin 1 nucleus relative to the heteronuclear coupling between the spins. The so-called Q.E.COSY approach is demonstrated with its sign-sensitivity using variable angle NMR, stretched gels and liquid crystalline phases applied to various CD and CD3 groups. Especially the sign-sensitive measurement of residual quadrupolar couplings that remain unresolved in conventional deuterium 1D spectra is shown.
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Affiliation(s)
- Pavleta Tzvetkova
- Institute of Organic Chemistry and Institute for Biological Interfaces 4 - Magnetic Resonance, Fritz-Haber-Weg 6, 76131, Karlsruhe, Germany
| | - Burkhard Luy
- Institute of Organic Chemistry and Institute for Biological Interfaces 4 - Magnetic Resonance, Fritz-Haber-Weg 6, 76131, Karlsruhe, Germany
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8
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Naumann C, Kuchel PW. NMR Spectra of Glycine Isotopomers in Anisotropic Media: Subtle Chiral Interactions. Anal Chem 2015; 87:10437-42. [PMID: 26430874 DOI: 10.1021/acs.analchem.5b02542] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
NMR spectra of deuterated glycine-2-(13)C revealed interactions between chiral anisotropic gelatin and κ-carrageenan gels and the prochiral and chiral isotopomers. The (1)H, (2)H and (13)C NMR spectra of mixtures of racemic mono- and prochiral bis-deuterated glycine-2-(13)C were resolved and well simulated using distinct dipolar coupling constants DCαH and DCαD for the enantiomers and also for the -(13)CαD2- group (DC,DA, and DC,DB). The orientation of the proton or deuteron on the (13)Cα-atom of glycine was assigned by analogy with alanine and lactate assuming that the molecular orientation of glycine isotopomers is the same. The assignment of the prochiral sites was derived from chiral analogues.
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Affiliation(s)
- Christoph Naumann
- School of Molecular Bioscience University of Sydney , Sydney, New South Wales 2006, Australia
| | - Philip W Kuchel
- School of Molecular Bioscience University of Sydney , Sydney, New South Wales 2006, Australia
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9
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Kasinathan B, Zawawi RM, Lim HN. Voltammetric studies and characterizations of biocompatible graphene/collagen nanocomposite-modified glassy carbon electrode towards enantio-recognition of chiral molecules. J APPL ELECTROCHEM 2015. [DOI: 10.1007/s10800-015-0882-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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10
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Lesot P, Aroulanda C, Zimmermann H, Luz Z. Enantiotopic discrimination in the NMR spectrum of prochiral solutes in chiral liquid crystals. Chem Soc Rev 2015; 44:2330-75. [DOI: 10.1039/c4cs00260a] [Citation(s) in RCA: 91] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Theory and applications to stereo- and bio-chemistry of the discrimination of enantiotopic elements observed in the NMR spectra of prochiral solutes dissolved in chiral liquid crystals are comprehensively discussed.
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Affiliation(s)
- Philippe Lesot
- Laboratoire de RMN en Milieu Orienté CNRS UMR 8182
- ICMMO
- 91405 Orsay cedex
- France
| | - Christie Aroulanda
- Laboratoire de RMN en Milieu Orienté CNRS UMR 8182
- ICMMO
- 91405 Orsay cedex
- France
| | - Herbert Zimmermann
- Abteilung Biophysik
- Max-Planck-Institut für Medizinische Forschung
- 69120 Heidelberg
- Germany
| | - Zeev Luz
- Weizmann Institute of Science
- Department of Chemical Physics
- Rehovot 76100
- Israel
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11
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Schiller J, Huster D. New methods to study the composition and structure of the extracellular matrix in natural and bioengineered tissues. BIOMATTER 2014; 2:115-31. [PMID: 23507863 PMCID: PMC3549865 DOI: 10.4161/biom.20866] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The extracellular matrix (ECM) comprises a gel of numerous biopolymers that occurs in a multitude of biological tissues. The ECM provides the basic support and mechanical strength of skeletal tissue and is responsible for shape retention. At the same time, the ECM is responsible for the viscoelastic properties and the elasticity of soft tissues. As expected, there are several important diseases that affect and degenerate the ECM with severe consequences for its properties. Bioengineering is a promising approach to support the regenerative capacity of the body. Unfortunately, the biomechanical properties of bioengineered ECM often only poorly meet the standards of their native counterparts. Many bioengineered tissues are characterized by an increased glycosaminoglycan (GAG) but decreased collagen content. This leads to an enhanced water content that strongly alters the viscoelastic and thus the biomechanical properties. Therefore, compositional analysis is important to estimate the tissue quality. We will show that nuclear magnetic resonance (NMR) spectroscopy and soft-ionization mass spectrometry (MS) represent useful techniques for ECM research both in natural and bioengineered tissues. Both methods are strongly complimentary: while MS techniques such as matrix-assisted laser desorption and ionization (MALDI) are excellent and very sensitive analytical tools to determine the collagen and the GAG contents of tissues, NMR spectroscopy provides insight into the molecular architecture of the ECM, its dynamics and other important parameters such as the water content of the tissue as well as the diffusion of molecules within the ECM.
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Affiliation(s)
- Jürgen Schiller
- University of Leipzig, Medical Faculty, Institute of Medical Physics and Biophysics, Leipzig, Germany.
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12
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Jagtap J, Chandel S, Das N, Soni J, Chatterjee S, Pradhan A, Ghosh N. Quantitative Mueller matrix fluorescence spectroscopy for precancer detection. OPTICS LETTERS 2014; 39:243-6. [PMID: 24562117 DOI: 10.1364/ol.39.000243] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Quantitative fluorescence spectroscopic Mueller matrix measurements from the connective tissue regions of human cervical tissue reveal intriguing fluorescence diattenuation and polarizance effects. Interestingly, the estimated fluorescence linear diattenuation and polarizance parameters were considerably reduced in the precancerous tissues as compared to the normal ones. These polarimetry effects of the autofluorescence were found to originate from anisotropically organized collagen molecular structures present in the connective tissues. Consequently, the reduction of the magnitude of these polarimetric parameters at higher grades of precancer was attributed to the loss of anisotropic organization of collagen, which was also confirmed by control experiments. These results indicate that fluorescence spectral diattenuation and polarizance parameters may serve as potentially useful diagnostic metrics.
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13
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Singh H, Shukla M, Rao BJ, Chary KVR. Flagella as a novel alignment medium for the measurement of residual dipolar couplings in proteins. Chem Commun (Camb) 2013; 49:11403-5. [PMID: 24165953 DOI: 10.1039/c3cc46233a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The two flexible rod-like flagella (∼500 nm in diameter and 5-15 μm long) of Chlamydomonas reinhardtii, a unicellular green alga, can weakly align molecules in an external magnetic field, thereby enabling the measurement of various residual dipolar couplings in solution NMR spectroscopy.
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14
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Merle C, Kummerlöwe G, Freudenberger JC, Halbach F, Stöwer W, Gostomski CLV, Höpfner J, Beskers T, Wilhelm M, Luy B. Crosslinked Poly(ethylene oxide) as a Versatile Alignment Medium for the Measurement of Residual Anisotropic NMR Parameters. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201301929] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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15
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Merle C, Kummerlöwe G, Freudenberger JC, Halbach F, Stöwer W, Gostomski CLV, Höpfner J, Beskers T, Wilhelm M, Luy B. Crosslinked Poly(ethylene oxide) as a Versatile Alignment Medium for the Measurement of Residual Anisotropic NMR Parameters. Angew Chem Int Ed Engl 2013; 52:10309-12. [DOI: 10.1002/anie.201301929] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2013] [Revised: 06/26/2013] [Indexed: 11/07/2022]
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16
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Kaden P, Freudenberger JC, Luy B. Noncovalently and covalently cross-linked polyurethane gels as alignment media and the suppression of residual polymer signals using diffusion-filtered spectroscopy. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2012; 50 Suppl 1:S22-S28. [PMID: 23280657 DOI: 10.1002/mrc.3887] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Revised: 08/03/2012] [Accepted: 09/20/2012] [Indexed: 06/01/2023]
Abstract
With polyurethane (PU), a novel alignment medium for organic solvents is introduced and characterized, which is very robust and easy to produce on a large scale. Linear PU already constitutes an elastomer gel with several solvents based on its ability to form hydrogen bonds. Covalent cross-linking of the polymer with accelerated electrons provides an alignment medium with different properties. However, PU exhibits a number of undesired polymer signals in corresponding spectra, which ideally have to be removed spectroscopically. Within this context, we demonstrate the applicability of diffusion-filtered experiments for removal of the polymer signals. Example spectra for the usefulness of PU alignment media are provided for the common test molecules strychnine and norcamphor.
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Affiliation(s)
- Peter Kaden
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal, Postfach 3640, 76021 Karlsruhe, Germany
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17
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Naumann C, Kuchel PW. Matrix-dependent modulation of anisotropic effects on NMR spectra from 7Li+ and 23Na+ encapsulated in cryptands. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2012; 42:17-23. [DOI: 10.1007/s00249-012-0869-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Revised: 04/25/2012] [Accepted: 04/30/2012] [Indexed: 10/27/2022]
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18
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Self-Assembly of Folic Acid: A Chiral-Aligning Medium for Enantiodiscrimination of Organic Molecules in an Aqueous Environment. Chemistry 2012; 18:11560-3. [DOI: 10.1002/chem.201201553] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Indexed: 11/07/2022]
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19
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Berger R, Courtieu J, Gil RR, Griesinger C, Köck M, Lesot P, Luy B, Merlet D, Navarro-Vázquez A, Reggelin M, Reinscheid UM, Thiele CM, Zweckstetter M. Is Enantiomer Assignment Possible by NMR Spectroscopy Using Residual Dipolar Couplings from Chiral Nonracemic Alignment Media?-A Critical Assessment. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201107626] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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20
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Berger R, Courtieu J, Gil RR, Griesinger C, Köck M, Lesot P, Luy B, Merlet D, Navarro-Vázquez A, Reggelin M, Reinscheid UM, Thiele CM, Zweckstetter M. Is Enantiomer Assignment Possible by NMR Spectroscopy Using Residual Dipolar Couplings from Chiral Nonracemic Alignment Media?-A Critical Assessment. Angew Chem Int Ed Engl 2012; 51:8388-91. [DOI: 10.1002/anie.201107626] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2011] [Revised: 06/08/2012] [Indexed: 11/09/2022]
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21
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Nath N, Suryaprakash N. Spin-Selective Correlation Experiment for Measurement of Long-Range J Couplings and for Assignment of (R/S) Enantiomers from the Residual Dipolar Couplings and DFT. J Phys Chem B 2011; 115:6868-75. [DOI: 10.1021/jp112416q] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nilamoni Nath
- Solid State and Structural Chemistry Unit and ‡NMR Research Centre, Indian Institute of Science, Bangalore 560012, India
| | - N. Suryaprakash
- Solid State and Structural Chemistry Unit and ‡NMR Research Centre, Indian Institute of Science, Bangalore 560012, India
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Naturally Occurring Biodegradable Polymers as the Basis of Chiral Gels for the Distinction of Enantiomers by Partially Oriented Nmr Spectroscopy. Int J Artif Organs 2011; 34:134-8. [DOI: 10.5301/ijao.2011.6419] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/17/2011] [Indexed: 11/20/2022]
Abstract
Introduction In modern, high resolution NMR spectroscopy, anisotropic parameters play an important role. They can be measured with the help of liquid crystalline mesophases or stretched polymer gels as so-called alignment media. Biologically occurring chiral polymers are of special interest as alignment media for this technique because they allow enantiomers to be distinguished. Methods Biopolymers have been studied by deuterium 1D and J-BIRDd,X-HSQC NMR experiments with respect to their ability to distinguish enantiomers and a summary of existing biopolymers for the task is given. Results Gelatin is shown to distinguish D-proline from L-proline and next to already known biopolymers, gellan gum is introduced as a novel biologically derived polymer that is able to partially align solute molecules. Conclusions Biologically occurring and biodegradable polymers are well suited as alignment media and in many cases are able to distinguish enantiomers. As the orienting properties are different for different media and solute molecules, the bandwidth of corresponding polymers will be further increased in the future.
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Kummerlöwe G, Grage SL, Thiele CM, Kuprov I, Ulrich AS, Luy B. Variable angle NMR spectroscopy and its application to the measurement of residual chemical shift anisotropy. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2011; 209:19-30. [PMID: 21256060 DOI: 10.1016/j.jmr.2010.11.019] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2010] [Revised: 11/30/2010] [Accepted: 11/30/2010] [Indexed: 05/30/2023]
Abstract
The successful measurement of anisotropic NMR parameters like residual dipolar couplings (RDCs), residual quadrupolar couplings (RQCs), or residual chemical shift anisotropy (RCSA) involves the partial alignment of solute molecules in an alignment medium. To avoid any influence of the change of environment from the isotropic to the anisotropic sample, the measurement of both datasets with a single sample is highly desirable. Here, we introduce the scaling of alignment for mechanically stretched polymer gels by varying the angle of the director of alignment relative to the static magnetic field, which we call variable angle NMR spectroscopy (VA-NMR). The technique is closely related to variable angle sample spinning NMR spectroscopy (VASS-NMR) of liquid crystalline samples, but due to the mechanical fixation of the director of alignment no sample spinning is necessary. Also, in contrast to VASS-NMR, VA-NMR works for the full range of sample inclinations between 0° and 90°. Isotropic spectra are obtained at the magic angle. As a demonstration of the approach we measure ¹³C-RCSA values for strychnine in a stretched PDMS/CDCl₃ gel and show their usefulness for assignment purposes. In this context special care has been taken with respect to the exact calibration of chemical shift data, for which three approaches have been derived and tested.
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Affiliation(s)
- Grit Kummerlöwe
- Department Chemie, Lehrstuhl Organische Chemie II, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany
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Nath N, Suryaprakash N. Enantiodiscrimination and extraction of short and long range homo- and hetero-nuclear residual dipolar couplings by a spin selective correlation experiment. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.07.027] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Kummerlöwe G, McCord E, Cheatham S, Niss S, Schnell R, Luy B. Tunable Alignment for All Polymer Gel/Solvent Combinations for the Measurement of Anisotropic NMR Parameters. Chemistry 2010; 16:7087-9. [DOI: 10.1002/chem.201000108] [Citation(s) in RCA: 57] [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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Prabhu UR, Suryaprakash N. Application of z-COSY experiment and its variant for accurate chiral discrimination by (1)H NMR. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2010; 202:217-222. [PMID: 20005755 DOI: 10.1016/j.jmr.2009.11.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2009] [Revised: 11/11/2009] [Accepted: 11/13/2009] [Indexed: 05/28/2023]
Abstract
We report the application of z-COSY experiment and a band selected version of it by employing a selective 90 degrees pulse entitled BASE-z-COSY for precise chiral discrimination, quantification of enantiomeric excess and the analyses of the (1)H NMR spectra of chiral molecules aligned in the chiral liquid crystalline solvent poly-gamma-benzyl-l-glutamate (PBLG). We have demonstrated their applicability for obtaining very high resolution in the (1)H NMR spectra of small organic molecules. It is well known that the commonly employed z-COSY experiment disentangles the spectral complexity, provides pure phase spectra with high resolution, aids in the complete spectral analyses, in addition to yielding information on relative signs of the couplings. The BASE-z-COSY experiment possesses all these properties, permits the measure of enantiomeric excess, in addition to large saving of instrument time.
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Affiliation(s)
- Uday Ramesh Prabhu
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India
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Kataky R, Zawawi RM. Modification of the chiral selectivity of d-glucose oxidase and l-lactate oxidase in a collagen matrix. Phys Chem Chem Phys 2010; 12:9183-7. [DOI: 10.1039/c003933k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kummerlöwe G, Kiran M, Luy B. Covalently Cross-linked Gelatin Allows Chiral Distinction at Elevated Temperatures and in DMSO. Chemistry 2009; 15:12192-5. [DOI: 10.1002/chem.200902193] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Nath N, Baishya B, Suryaprakash N. Visualization of enantiomers using natural abundant (13)C-filtered single and double quantum selective refocusing experiments: Application to small chiral molecules. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2009; 200:101-108. [PMID: 19581115 DOI: 10.1016/j.jmr.2009.06.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2009] [Revised: 05/09/2009] [Accepted: 06/12/2009] [Indexed: 05/28/2023]
Abstract
The routine use of proton NMR for the visualization of enantiomers, aligned in the chiral liquid crystal solvent poly-gamma-benzyl-l-glutamate (PBLG), is restricted due to severe loss of resolution arising from large number of pair wise interaction of nuclear spins. In the present study, we have designed two experimental techniques for their visualization utilizing the natural abundance (13)C edited selective refocusing of single quantum (CH-SERF) and double quantum (CH-DQSERF) coherences. The methods achieve chiral discrimination and aid in the simultaneous determination of homonuclear couplings between active and passive spins and heteronuclear couplings between the excited protons and the participating (13)C spin. The CH-SERF also overcomes the problem of overlap of central transitions of the methyl selective refocusing (SERF) experiment resulting in better chiral discrimination. Theoretical description of the evolution of magnetization in both the sequences has been discussed using polarization operator formalism.
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Affiliation(s)
- Nilamoni Nath
- NMR Research Centre, Indian Institute of Science, Bangalore 560012, India
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Naumann C, Bubb WA, Chapman BE, Kuchel PW. Tunable-Alignment Chiral System Based on Gelatin for NMR Spectroscopy. J Am Chem Soc 2007; 129:5340-1. [PMID: 17417851 DOI: 10.1021/ja070348v] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christoph Naumann
- School of Molecular and Microbial Biosciences, University of Sydney, NSW 2006, Australia
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