1
|
Klitou P, Parisi E, Bordignon S, Bravetti F, Rosbottom I, Dell’Aera M, Cuocci C, Chierotti MR, Altomare A, Simone E. Navigating the Complex Solid Form Landscape of the Quercetin Flavonoid Molecule. CRYSTAL GROWTH & DESIGN 2023; 23:6034-6045. [PMID: 37547879 PMCID: PMC10401642 DOI: 10.1021/acs.cgd.3c00584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Revised: 07/01/2023] [Indexed: 08/08/2023]
Abstract
Quercetin, a naturally occurring bioflavonoid substance widely used in the nutraceutical and food industries, exists in various solid forms that can have different physicochemical properties, thus impacting this compound's performance in various applications. In this work, we will clarify the complex solid-form landscape of this molecule. Two elusive isostructural solvates of quercetin were obtained from ethanol and methanol. The obtained crystals were characterized experimentally, but the crystallographic structure could not be solved due to their high instability. Nevertheless, the desolvated structure resulting from a high-temperature treatment (or prolonged storage at ambient conditions) of both these two labile crystals was characterized and solved via powder X-ray diffraction and solid-state nuclear magnetic resonance (SSNMR). This anhydrous crystal structure was compared with another anhydrous quercetin form obtained in our previous work, indicating that, at least, two different anhydrous polymorphs of quercetin exist. Navigating the solid-form landscape of quercetin is essential to ensure accurate control of the functional properties of food, nutraceutical, or pharmaceutical products containing crystal forms of this substance.
Collapse
Affiliation(s)
- Panayiotis Klitou
- School
of Food Science and Nutrition, Food Colloids and Bioprocessing Group, University of Leeds, Leeds LS2 9JT, UK
| | - Emmanuele Parisi
- Department
of Applied Science and Technology (DISAT), Politecnico di Torino, Torino I-10129, Italy
| | - Simone Bordignon
- Dipartimento
di Chimica I.F.M, Università degli
Studi di Torino, Via P. Giuria 7, Torino I-10125, Italy
| | - Federica Bravetti
- Dipartimento
di Chimica I.F.M, Università degli
Studi di Torino, Via P. Giuria 7, Torino I-10125, Italy
| | - Ian Rosbottom
- School
of Chemical and Process Engineering, University
of Leeds, Woodhouse
Lane Leeds LS2 9JT, UK
| | - Marzia Dell’Aera
- Institute
of Crystallography IC − CNR, via Amendola 122/O, Bari I-70126, Italy
| | - Corrado Cuocci
- Institute
of Crystallography IC − CNR, via Amendola 122/O, Bari I-70126, Italy
| | - Michele R. Chierotti
- Dipartimento
di Chimica I.F.M, Università degli
Studi di Torino, Via P. Giuria 7, Torino I-10125, Italy
| | - Angela Altomare
- Institute
of Crystallography IC − CNR, via Amendola 122/O, Bari I-70126, Italy
| | - Elena Simone
- School
of Food Science and Nutrition, Food Colloids and Bioprocessing Group, University of Leeds, Leeds LS2 9JT, UK
- Department
of Applied Science and Technology (DISAT), Politecnico di Torino, Torino I-10129, Italy
| |
Collapse
|
2
|
Uyeki SC, Pacheco CM, Simeral ML, Hafner JH. The Raman Active Vibrations of Flavone and Quercetin: The Impact of Conformers and Hydrogen Bonding on Fingerprint Modes. J Phys Chem A 2023; 127:1387-1394. [PMID: 36735995 DOI: 10.1021/acs.jpca.2c06718] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The detection and analysis of flavonoids by Raman spectroscopy are of interest in many fields, including medicinal chemistry, food science, and astrobiology. Spectral interpretation would benefit from better identification of the fingerprint vibrational peaks of different flavonoids and how they are affected by intermolecular interactions. The Raman spectra of two flavonoids, flavone and quercetin, were investigated through comparisons between spectra recorded from pure powders and spectra calculated with time dependent density functional theory (TDDFT). For both flavone and quercetin, 17 peaks were assigned to specific molecular vibrations. Both flavonoids were found to have a split peak between 1250-1350 cm-1 that is not predicted by TDDFT calculations on isolated molecules. In each case, it is shown that the addition of hydrogen bonded molecules arranged based on crystal structures reproduces the split peaks. These peaks were due to a stretching vibration of the bond between benzopyrone and phenyl rings and represent a characteristic spectral feature of flavonoids. Spectra of pollen grains from Quercus virginiana were also recorded and exhibit several peaks that correspond to the quercetin spectrum.
Collapse
Affiliation(s)
- S Campbell Uyeki
- Department of Physics & Astronomy, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Charles M Pacheco
- Department of Physics & Astronomy, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Mathieu L Simeral
- Department of Physics & Astronomy, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| | - Jason H Hafner
- Department of Physics & Astronomy, Rice University, 6100 Main Street, Houston, Texas 77005, United States.,Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, United States
| |
Collapse
|
3
|
Li Z, Zhou J, Zhang X, Wu S, Gong J. Exploring the influence of crystal packing on the optical-physical property of quercetin-based binary and ternary solid forms. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.107983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
4
|
Optical absorption measurements and optoelectronic DFT calculations for ethanol solvated quercetin and anhydrous/hydrated quercetin crystals. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
5
|
Energy of the CH⋯O H-bonds and others specific contacts in the quercetin molecule: QM/QTAIM approximation formulas. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113456] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
6
|
Grosu IG, Filip X, Miclăuș MO, Filip C. Hydrogen-Mediated Noncovalent Interactions in Solids: What Can NMR Crystallography Tell About? Molecules 2020; 25:E3757. [PMID: 32824749 PMCID: PMC7463941 DOI: 10.3390/molecules25163757] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 08/15/2020] [Accepted: 08/16/2020] [Indexed: 12/18/2022] Open
Abstract
Hydrogen atoms play a crucial role in the aggregation of organic (bio)molecules through diverse number of noncovalent interactions that they mediate, such as electrostatic in proton transfer systems, hydrogen bonding, and CH-π interactions, to mention only the most prominent. To identify and adequately describe such low-energy interactions, increasingly sensitive methods have been developed over time, among which quantum chemical computations have witnessed impressive advances in recent years. For reaching the present state-of-the-art, computations had to rely on a pool of relevant experimental data, needed at least for validation, if not also for other purposes. In the case of molecular crystals, the best illustration for the synergy between computations and experiment is given by the so-called NMR crystallography approach. Originally designed to increase the confidence level in crystal structure determination of organic compounds from powders, NMR crystallography is able now to offer also a wealth of information regarding the noncovalent interactions that drive molecules to pack in a given crystalline pattern or another. This is particularly true for the noncovalent interactions which depend on the exact location of labile hydrogen atoms in the system: in such cases, NMR crystallography represents a valuable characterization tool, in some cases complementing even the standard single-crystal X-ray diffraction technique. A concise introduction in the field is made in this mini-review, which is aimed at providing a comprehensive picture with respect to the current accuracy level reached by NMR crystallography in the characterization of hydrogen-mediated noncovalent interactions in organic solids. Different types of practical applications are illustrated with the example of molecular crystals studied by our research group, but references to other representative developments reported in the literature are also made. By summarizing the major concepts and methodological progresses, the present work is also intended to be a guide to the practical potential of this relatively recent analytical tool for the scientists working in areas where crystal engineering represents the main approach for rational design of novel materials.
Collapse
Affiliation(s)
| | | | | | - Claudiu Filip
- National Institute for R&D of Isotopic and Molecular Technologies, 400293 Cluj, Romania; (I.G.G.); (X.F.); (M.O.M.)
| |
Collapse
|
7
|
Hodgkinson P. NMR crystallography of molecular organics. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2020; 118-119:10-53. [PMID: 32883448 DOI: 10.1016/j.pnmrs.2020.03.001] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 02/25/2020] [Accepted: 03/13/2020] [Indexed: 06/11/2023]
Abstract
Developments of NMR methodology to characterise the structures of molecular organic structures are reviewed, concentrating on the previous decade of research in which density functional theory-based calculations of NMR parameters in periodic solids have become widespread. With a focus on demonstrating the new structural insights provided, it is shown how "NMR crystallography" has been used in a spectrum of applications from resolving ambiguities in diffraction-derived structures (such as hydrogen atom positioning) to deriving complete structures in the absence of diffraction data. As well as comprehensively reviewing applications, the different aspects of the experimental and computational techniques used in NMR crystallography are surveyed. NMR crystallography is seen to be a rapidly maturing subject area that is increasingly appreciated by the wider crystallographic community.
Collapse
Affiliation(s)
- Paul Hodgkinson
- Department of Chemistry, Durham University, Stockton Road, Durham DH1 3LE, UK.
| |
Collapse
|
8
|
Dudek MK, Paluch P, Śniechowska J, Nartowski KP, Day GM, Potrzebowski MJ. Crystal structure determination of an elusive methanol solvate – hydrate of catechin using crystal structure prediction and NMR crystallography. CrystEngComm 2020. [DOI: 10.1039/d0ce00452a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
A useful short-cut was developed to limit the number of molecular conformations that need to be regarded in crystal structure prediction calculations, which led to the crystal structure determination of new methanol solvate – hydrate of catechin.
Collapse
Affiliation(s)
- Marta K. Dudek
- Centre of Molecular and Macromolecular Studies of Polish Academy of Sciences
- 90-363 Lodz
- Poland
| | - Piotr Paluch
- Centre of Molecular and Macromolecular Studies of Polish Academy of Sciences
- 90-363 Lodz
- Poland
| | - Justyna Śniechowska
- Centre of Molecular and Macromolecular Studies of Polish Academy of Sciences
- 90-363 Lodz
- Poland
| | - Karol P. Nartowski
- Department of Drug Form Technology
- Wroclaw Medical University
- 50-556 Wroclaw
- Poland
| | - Graeme M. Day
- Computational Systems Chemistry
- School of Chemistry
- University of Southampton
- UK
| | - Marek J. Potrzebowski
- Centre of Molecular and Macromolecular Studies of Polish Academy of Sciences
- 90-363 Lodz
- Poland
| |
Collapse
|
9
|
Pereira AB, Silva AMD, Barroca MJ, Marques MPM, Braga SS. Physicochemical properties, antioxidant action and practical application in fresh cheese of the solid inclusion compound γ-cyclodextrin·quercetin, in comparison with β-cyclodextrin·quercetin. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2017.04.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
|
10
|
Brovarets’ OO, Hovorun DM. Conformational diversity of the quercetin molecule: a quantum-chemical view. J Biomol Struct Dyn 2019; 38:2817-2836. [DOI: 10.1080/07391102.2019.1656671] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Ol’ha O. Brovarets’
- Department of Molecular and Quantum Biophysics, Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
| | - Dmytro M. Hovorun
- Department of Molecular and Quantum Biophysics, Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
- Department of Molecular Biotechnology and Bioinformatics, Institute of High Technologies, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
| |
Collapse
|
11
|
Brovarets’ OO, Hovorun DM. Conformational transitions of the quercetin molecule via the rotations of its rings: a comprehensive theoretical study. J Biomol Struct Dyn 2019; 38:2865-2883. [DOI: 10.1080/07391102.2019.1645734] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Ol’ha O. Brovarets’
- Department of Molecular and Quantum Biophysics, Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
- Department of Pharmacology, Bohomolets National Medical University, Kyiv, Ukraine
| | - Dmytro M. Hovorun
- Department of Molecular and Quantum Biophysics, Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine, Kyiv, Ukraine
- Department of Molecular Biotechnology and Bioinformatics, Institute of High Technologies, Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
- Department of Pathophysiology, Bohomolets National Medical University, Kyiv, Ukraine
| |
Collapse
|
12
|
Zilka M, Yates JR, Brown SP. An NMR crystallography investigation of furosemide. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2019; 57:191-199. [PMID: 30141257 PMCID: PMC6492277 DOI: 10.1002/mrc.4789] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Revised: 07/16/2018] [Accepted: 08/06/2018] [Indexed: 05/04/2023]
Abstract
This paper presents an NMR crystallography study of three polymorphs of furosemide. Experimental magic-angle spinning (MAS) solid-state NMR spectra are reported for form I of furosemide, and these are assigned using density-functional theory (DFT)-based gauge-including projector augmented wave (GIPAW) calculations. Focusing on the three known polymorphs, we examine the changes to the NMR parameters due to crystal packing effects. We use a recently developed formalism to visualise which regions are responsible for the chemical shielding of particular sites and hence understand the variation in NMR parameters between the three polymorphs.
Collapse
Affiliation(s)
- Miri Zilka
- Department of PhysicsUniversity of WarwickCoventryUnited Kingdom
| | | | - Steven P. Brown
- Department of PhysicsUniversity of WarwickCoventryUnited Kingdom
| |
Collapse
|
13
|
Grüninger H, Schmutzler A, Siegel R, Armstrong K, Frost DJ, Senker J. Quantitative description of 1H SQ and DQ coherences for the hydroxyl disorder within hydrous ringwoodite. Phys Chem Chem Phys 2018; 20:15098-15105. [PMID: 29799049 DOI: 10.1039/c8cp00863a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Proton-containing point defects in solid materials are important for a variety of properties ranging from ionic transport over thermal conductivity up to compressibility. Ultrafast magic-angle spinning techniques nowadays offer high-resolution solid-state NMR spectra, even for 1H, and thus open up possibilities to study the underlying defect chemistry. Nevertheless, disorder within such defects again leads to heavy spectral overlap of 1H resonances, which prevents quantitative analysis of defect concentrations, if several defect types are present. Here, we present a strategy to overcome this limitation by simulating the 1H lineshape as well as 1H-1H double-quantum buildup curves, which we then validate against the experimental data in a joint cost function. To mimic the local structural disorder, we use molecular dynamics simulations at the DFT level. It turned out to be advantageous for the joint refinement to put the computational effort into the structural optimisation to derive accurate proton positions and to use empirical correlations for the relation between isotropic and anisotropic 1H chemical shifts and structural elements. The expressiveness of this approach is demonstrated on ringwoodite's (γ-Mg2SiO4) OH defect chemistry containing four different defect types in octahedral and tetrahedral voids with both pure Mg and mixed Si and Mg cation environments. Still, we determine the ratio for each defect type with an accuracy of about 5% as a result of the minimization of the joint cost function. We expect that our approach is generally applicable for local proton disorder and might prove to be a valuable alternative to the established AIRSS and Monte Carlo methods, respectively.
Collapse
Affiliation(s)
- Helen Grüninger
- Anorganische Chemie III, University of Bayreuth, Universitätsstr. 30, 95447 Bayreuth, Germany.
| | | | | | | | | | | |
Collapse
|
14
|
Aqueous injection of quercetin: An approach for confirmation of its direct in vivo cardiovascular effects. Int J Pharm 2018; 541:224-233. [DOI: 10.1016/j.ijpharm.2018.02.036] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 02/14/2018] [Accepted: 02/19/2018] [Indexed: 02/07/2023]
|
15
|
Cîrcu M, Filip C. Closer to the polydopamine structure: new insights from a combined 13C/1H/2H solid-state NMR study on deuterated samples. Polym Chem 2018. [DOI: 10.1039/c8py00633d] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
13C/1H/2H ss-NMR on deuterated samples provide strong experimental evidence for the most probable monomer connectivity, π–π stacking, and the water dynamics in polydopamine.
Collapse
Affiliation(s)
- Monica Cîrcu
- National Institute for Research and Development of Isotopic and Molecular Technologies
- 400293 Cluj-Napoca
- Romania
| | - Claudiu Filip
- National Institute for Research and Development of Isotopic and Molecular Technologies
- 400293 Cluj-Napoca
- Romania
| |
Collapse
|
16
|
Optimized multi-step NMR-crystallography approach for structural characterization of a stable quercetin solvate. J Pharm Biomed Anal 2017; 138:22-28. [DOI: 10.1016/j.jpba.2017.01.047] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 01/20/2017] [Accepted: 01/22/2017] [Indexed: 11/19/2022]
|
17
|
Siskos MG, Choudhary MI, Gerothanassis IP. Hydrogen Atomic Positions of O-H···O Hydrogen Bonds in Solution and in the Solid State: The Synergy of Quantum Chemical Calculations with ¹H-NMR Chemical Shifts and X-ray Diffraction Methods. Molecules 2017; 22:E415. [PMID: 28272366 PMCID: PMC6155303 DOI: 10.3390/molecules22030415] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Revised: 02/27/2017] [Accepted: 03/03/2017] [Indexed: 12/21/2022] Open
Abstract
The exact knowledge of hydrogen atomic positions of O-H···O hydrogen bonds in solution and in the solid state has been a major challenge in structural and physical organic chemistry. The objective of this review article is to summarize recent developments in the refinement of labile hydrogen positions with the use of: (i) density functional theory (DFT) calculations after a structure has been determined by X-ray from single crystals or from powders; (ii) ¹H-NMR chemical shifts as constraints in DFT calculations, and (iii) use of root-mean-square deviation between experimentally determined and DFT calculated ¹H-NMR chemical shifts considering the great sensitivity of ¹H-NMR shielding to hydrogen bonding properties.
Collapse
Affiliation(s)
- Michael G Siskos
- Section of Organic Chemistry & Biochemistry, Department of Chemistry, University of Ioannina, Ioannina GR-45110, Greece.
| | - M Iqbal Choudhary
- H.E.J. Research Institute of Chemistry, International Center for Biological and Chemical Sciences, University of Karachi, Karachi 75270, Pakistan.
| | - Ioannis P Gerothanassis
- Section of Organic Chemistry & Biochemistry, Department of Chemistry, University of Ioannina, Ioannina GR-45110, Greece.
- H.E.J. Research Institute of Chemistry, International Center for Biological and Chemical Sciences, University of Karachi, Karachi 75270, Pakistan.
| |
Collapse
|
18
|
Trendafilova I, Szegedi A, Mihály J, Momekov G, Lihareva N, Popova M. Preparation of efficient quercetin delivery system on Zn-modified mesoporous SBA-15 silica carrier. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 73:285-292. [PMID: 28183610 DOI: 10.1016/j.msec.2016.12.063] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 11/16/2016] [Accepted: 12/13/2016] [Indexed: 01/09/2023]
Abstract
Mesoporous silica material type SBA-15 was modified with different amounts of Zn (2 and 4wt.%) by incipient wetness impregnation method in ethanol. The parent, Zn-modified and quercetin loaded samples, were characterized by XRD, N2 physisorption, TEM, thermal gravimetric analysis, UV-vis and FT-IR spectroscopies and in vitro release of quercetin at pH5.5 which is typical of dermal formulations. By this loading method anhydrous quercetin was formed on the silica carrier It was found that the different hydrate forms of quercetin (dihydrate, monohydrate, anhydrite) significantly influence the physico-chemical properties of the delivery system. It was found that hydrate forms of quercetin can be differentiated by XRD and by FT-IR spectroscopic methods. Thus, by evaluating the interaction of the drug with the silica carrier the changes due to its hydration state always have to be taken into account. Formation of Zn-quercetin complex was evidenced on zinc modified SBA-15 silica by FT-IR spectroscopy. High quercetin loading capacity (over 40wt.%) could be achieved on the parent and Zn-containing SBA-15 samples. The in-vitro release process at pH=5.5 showed slower quercetin release from Zn-modified SBA-15 samples compared to the parent one. Additionally, the comparative cytotoxic experiments evidenced that quercetin encapsulated in Zn-modified silica carriers has superior antineoplastic potential against HUT-29 cells compared to free drug. Zn-modified SBA-15 silica particles could be promising carriers for dermal delivery of quercetin.
Collapse
Affiliation(s)
- Ivalina Trendafilova
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Agnes Szegedi
- Research Centre for Natural Sciences, Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences, 1117 Budapest, Magyar Tudósok Krt. 2, Hungary
| | - Judith Mihály
- Research Centre for Natural Sciences, Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences, 1117 Budapest, Magyar Tudósok Krt. 2, Hungary
| | - Georgi Momekov
- Faculty of Pharmacy, Medical University of Sofia, 1000 Sofia, Bulgaria
| | - Nadejda Lihareva
- Institute of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Margarita Popova
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
| |
Collapse
|
19
|
|
20
|
Halo M, Ferrari AM, Berlier G, Miletto I, Casassa S. Experimental and first-principles IR characterization of quercetin adsorbed on a silica surface. Theor Chem Acc 2016. [DOI: 10.1007/s00214-016-1854-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
21
|
Abstract
Interest in molecular crystals has grown thanks to their relevance to pharmaceuticals, organic semiconductor materials, foods, and many other applications. Electronic structure methods have become an increasingly important tool for modeling molecular crystals and polymorphism. This article reviews electronic structure techniques used to model molecular crystals, including periodic density functional theory, periodic second-order Møller-Plesset perturbation theory, fragment-based electronic structure methods, and diffusion Monte Carlo. It also discusses the use of these models for predicting a variety of crystal properties that are relevant to the study of polymorphism, including lattice energies, structures, crystal structure prediction, polymorphism, phase diagrams, vibrational spectroscopies, and nuclear magnetic resonance spectroscopy. Finally, tools for analyzing crystal structures and intermolecular interactions are briefly discussed.
Collapse
Affiliation(s)
- Gregory J O Beran
- Department of Chemistry, University of California , Riverside, California 92521, United States
| |
Collapse
|
22
|
Highly sensitive solid forms discrimination on the whole tablet of the active ingredients in quercetin dietary supplements by NMR crystallography approaches. J Pharm Biomed Anal 2016; 124:274-280. [PMID: 26970982 DOI: 10.1016/j.jpba.2016.03.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 02/26/2016] [Accepted: 03/01/2016] [Indexed: 11/22/2022]
Abstract
Similarly to synthetic drugs, the exact crystalline form of active ingredients in solid formulations of dietary supplements may directly influence the dissolution rate, bioavailability, and stability of the final product, but this information is usually not provided by manufacturers. Working on the examples of two commercial quercetin dietary supplements a quick, reliable, and sensitive method is introduced for quercetin solid forms discrimination directly on the marketed products, without the need for prior sample preparation. It exploits the complementarity between solid-state Nuclear Magnetic Resonance (ss-NMR) and Powder X-Ray Diffraction (PXRD), which proved essential for performing a complete and accurate solid-state characterization of the two commercial products, and for obtaining new insights into the complex quercetin solid-forms landscape. The method can be readily generalized also to other dietary supplements based on bio-flavonoids/polyphenols.
Collapse
|
23
|
Caddeo C, Díez-Sales O, Pons R, Carbone C, Ennas G, Puglisi G, Fadda AM, Manconi M. Cross-linked chitosan/liposome hybrid system for the intestinal delivery of quercetin. J Colloid Interface Sci 2016; 461:69-78. [DOI: 10.1016/j.jcis.2015.09.013] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Revised: 09/04/2015] [Accepted: 09/04/2015] [Indexed: 10/23/2022]
|
24
|
Lüdeker D, Brunklaus G. NMR crystallography of ezetimibe co-crystals. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2015; 65:29-40. [PMID: 25541425 DOI: 10.1016/j.ssnmr.2014.11.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Revised: 11/06/2014] [Accepted: 11/18/2014] [Indexed: 06/04/2023]
Abstract
An efficient, simplified protocol for solvent-drop assisted co-crystal preparation of ezetimibe (a drug for the treatment of primary hypercholesterolemia) with both imidazole and l-proline has been derived. The structures of the white powders were successfully solved via "NMR crystallography" combining solid-state NMR, powder X-ray diffraction and DFT chemical shift computations. Detailed insights into the likely crystallization mechanism were obtained from competition experiments, where efficient co-crystallization was feasible using ezetimibe monohydrate as precursor indicating that the crystal water acts as "molecular catalyst". It was also found that co-crystallization of imidazole is favored over l-proline, thus suggesting a clear preference of neutral hydrogen bonds compared to charge-assisted motifs.
Collapse
Affiliation(s)
- David Lüdeker
- Institut für Physikalische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstr. 28, D-48149 Münster, Germany
| | - Gunther Brunklaus
- Institut für Physikalische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstr. 28, D-48149 Münster, Germany.
| |
Collapse
|
25
|
Filip X, Filip C. Can the conformation of flexible hydroxyl groups be constrained by simple NMR crystallography approaches? The case of the quercetin solid forms. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2015; 65:21-28. [PMID: 25465481 DOI: 10.1016/j.ssnmr.2014.10.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Revised: 10/08/2014] [Accepted: 10/23/2014] [Indexed: 06/04/2023]
Abstract
Hydrogen atoms in systems with many flexible hydroxyl side-groups are difficult to be exactly located from experimental X-Ray diffraction and/or solid-state NMR data, thus often leading to wrong conclusions with respect to the hydrogen bonding network established in crystal lattice. A simple computational method is proposed in the present work to tackle this problem, which may be readily incorporated in conventional NMR crystallography protocols. The method is based on ranking all possible conformations of the flexible hydroxyls according to their lattice energy in crystalline environments. Its effectiveness is investigated on two distinct solid forms of quercetin, for which only two out of the five hydroxyl side-groups can be well constrained from experimental/theoretical data. For this purpose, first-principle quantum-mechanical computations were combined with calculations at the molecular mechanics (MM) level of theory, and previous ss-NMR and X-Ray diffraction data. To assess accuracy in ranking the identified conformers, tests have been performed first on quercetin dihydrate, for which an X-Ray single-crystal structure is available. The possibility of applying this method in a real NMR crystallography context has been investigated finally on anhydrous quercetin, for which only powder X-Ray crystal structure has been reported so far.
Collapse
Affiliation(s)
- Xenia Filip
- National Institute for R&D of Isotopic and Molecular Technologies, P.O. Box 700, 400293 Cluj, Romania
| | - Claudiu Filip
- National Institute for R&D of Isotopic and Molecular Technologies, P.O. Box 700, 400293 Cluj, Romania.
| |
Collapse
|
26
|
Garino C, Borfecchia E, Gobetto R, van Bokhoven JA, Lamberti C. Determination of the electronic and structural configuration of coordination compounds by synchrotron-radiation techniques. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.03.027] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
27
|
Li X, Bond AD, Johansson KE, Van de Streek J. Distinguishing tautomerism in the crystal structure of (Z)-N-(5-ethyl-2,3-dihydro-1,3,4-thiadiazol-2-ylidene)-4-methylbenzenesulfonamide using DFT-D calculations and (13)C solid-state NMR. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2014; 70:784-9. [PMID: 25093360 PMCID: PMC4174016 DOI: 10.1107/s2053229614015356] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Accepted: 06/30/2014] [Indexed: 12/18/2022]
Abstract
The crystal structure of (Z)-N-(5-ethyl-2,3-dihydro-1,3,4-thiadiazol-2-ylidene)-4-methylbenzenesulfonamide contains an imine tautomer, rather than the previously reported amine tautomer. The tautomers can be distinguished using dispersion-corrected density functional theory calculations and by comparison of calculated and measured 13C solid-state NMR spectra. The crystal structure of the title compound, C11H13N3O2S2, has been determined previously on the basis of refinement against laboratory powder X-ray diffraction (PXRD) data, supported by comparison of measured and calculated 13C solid-state NMR spectra [Hangan et al. (2010 ▶). Acta Cryst. B66, 615–621]. The molecule is tautomeric, and was reported as an amine tautomer [systematic name: N-(5-ethyl-1,3,4-thiadiazol-2-yl)-p-toluenesulfonamide], rather than the correct imine tautomer. The protonation site on the molecule’s 1,3,4-thiadiazole ring is indicated by the intermolecular contacts in the crystal structure: N—H⋯O hydrogen bonds are established at the correct site, while the alternative protonation site does not establish any notable intermolecular interactions. The two tautomers provide essentially identical Rietveld fits to laboratory PXRD data, and therefore they cannot be directly distinguished in this way. However, the correct tautomer can be distinguished from the incorrect one by previously reported quantitative criteria based on the extent of structural distortion on optimization of the crystal structure using dispersion-corrected density functional theory (DFT-D) calculations. Calculation of the 13C SS-NMR spectrum based on the correct imine tautomer also provides considerably better agreement with the measured 13C SS-NMR spectrum.
Collapse
Affiliation(s)
- Xiaozhou Li
- Department of Pharmacy, University of Copenhagen, Universitetsparken 2, Copenhagen DK-2100, Denmark
| | - Andrew D Bond
- Department of Pharmacy, University of Copenhagen, Universitetsparken 2, Copenhagen DK-2100, Denmark
| | - Kristoffer E Johansson
- Department of Pharmacy, University of Copenhagen, Universitetsparken 2, Copenhagen DK-2100, Denmark
| | - Jacco Van de Streek
- Department of Pharmacy, University of Copenhagen, Universitetsparken 2, Copenhagen DK-2100, Denmark
| |
Collapse
|
28
|
Baldrighi M, Bartesaghi D, Cavallo G, Chierotti MR, Gobetto R, Metrangolo P, Pilati T, Resnati G, Terraneo G. Polymorphs and co-crystals of haloprogin: an antifungal agent. CrystEngComm 2014. [DOI: 10.1039/c4ce00367e] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Haloprogin is a widely used antifungal agent. Here we report the first polymorphs and halogen-bonded co-crystals ever described.
Collapse
Affiliation(s)
- Michele Baldrighi
- NFMLab-Laboratory of Nanostructured Fluorinated Materials (NFMLab)
- Department of Chemistry, Materials, and Chemical Engineering “Giulio Natta”
- Politecnico di Milano
- 20131 Milan, Italy
| | - Davide Bartesaghi
- NFMLab-Laboratory of Nanostructured Fluorinated Materials (NFMLab)
- Department of Chemistry, Materials, and Chemical Engineering “Giulio Natta”
- Politecnico di Milano
- 20131 Milan, Italy
| | - Gabriella Cavallo
- NFMLab-Laboratory of Nanostructured Fluorinated Materials (NFMLab)
- Department of Chemistry, Materials, and Chemical Engineering “Giulio Natta”
- Politecnico di Milano
- 20131 Milan, Italy
| | | | - Roberto Gobetto
- Department of Chemistry
- Università di Torino
- 10125 Torino, Italy
| | - Pierangelo Metrangolo
- NFMLab-Laboratory of Nanostructured Fluorinated Materials (NFMLab)
- Department of Chemistry, Materials, and Chemical Engineering “Giulio Natta”
- Politecnico di Milano
- 20131 Milan, Italy
| | - Tullio Pilati
- NFMLab-Laboratory of Nanostructured Fluorinated Materials (NFMLab)
- Department of Chemistry, Materials, and Chemical Engineering “Giulio Natta”
- Politecnico di Milano
- 20131 Milan, Italy
| | - Giuseppe Resnati
- NFMLab-Laboratory of Nanostructured Fluorinated Materials (NFMLab)
- Department of Chemistry, Materials, and Chemical Engineering “Giulio Natta”
- Politecnico di Milano
- 20131 Milan, Italy
| | - Giancarlo Terraneo
- NFMLab-Laboratory of Nanostructured Fluorinated Materials (NFMLab)
- Department of Chemistry, Materials, and Chemical Engineering “Giulio Natta”
- Politecnico di Milano
- 20131 Milan, Italy
| |
Collapse
|
29
|
Miclaus M, Grosu IG, Filip X, Tripon C, Filip C. Optimizing structure determination from powders of crystalline organic solids with high molecular flexibility: the case of lisinopril dihydrate. CrystEngComm 2014. [DOI: 10.1039/c3ce41890a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|