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Samsoen S, Dudognon É, Le Fer G, Fournier D, Woisel P, Affouard F. Impact of the polymer dispersity on the properties of curcumin/polyvinylpyrrolidone amorphous solid dispersions. Int J Pharm 2024; 653:123895. [PMID: 38346598 DOI: 10.1016/j.ijpharm.2024.123895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 01/20/2024] [Accepted: 02/07/2024] [Indexed: 02/19/2024]
Abstract
Amorphous solid dispersions (ASD) are known to enhance the absorption of poorly water-soluble drugs. In this work we synthesise well-defined Polyvinylpyrrolidone (PVP) to establish the impact of dispersity and chain-end functionality on the physical properties of Curcumin (CUR)/PVP ASD. Thermodynamic characterisation of synthesised PVP emphasises a strong effect of the dispersity on the glass transition temperature (Tg), 50 °C higher for synthesised PVP than for commercial PVP K12 of same molar mass. This increase of Tg affects the thermodynamic properties of CUR/PVP ASD successfully formulated up to 70 wt% of CUR by milling or solvent evaporation. The evolution of both the Tg and CUR solubility values versus CUR content points out the development of fairly strong CUR-PVP interactions that strengthen the antiplasticising effect of PVP on the Tg of ASD. However, for ASD formulated with commercial PVP this effect is counterbalanced at low CUR content by a plasticising effect due to the shortest PVP chains. Moreover, the overlay of the phase and state diagrams highlights the strong impact of the polymer dispersity on the stability of CUR/PVP ASD. ASD formulated with low dispersity PVP are stable on larger temperature and concentration ranges than those formulated with PVP K12.
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Affiliation(s)
- Simon Samsoen
- Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, F-59000, Lille, France
| | - Émeline Dudognon
- Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, F-59000, Lille, France.
| | - Gaëlle Le Fer
- Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, F-59000, Lille, France.
| | - David Fournier
- Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, F-59000, Lille, France
| | - Patrice Woisel
- Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, F-59000, Lille, France
| | - Frédéric Affouard
- Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, F-59000, Lille, France
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2
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Cordeiro T, Matos I, Danède F, Sotomayor JC, Fonseca IM, Corvo MC, Dionísio M, Viciosa MT, Affouard F, Correia NT. Evidence of Strong Guest-Host Interactions in Simvastatin Loaded in Mesoporous Silica MCM-41. Pharmaceutics 2023; 15:pharmaceutics15051320. [PMID: 37242562 DOI: 10.3390/pharmaceutics15051320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 04/15/2023] [Accepted: 04/20/2023] [Indexed: 05/28/2023] Open
Abstract
A rational design of drug delivery systems requires in-depth knowledge not only of the drug itself, in terms of physical state and molecular mobility, but also of how it is distributed among a carrier and its interactions with the host matrix. In this context, this work reports the behavior of simvastatin (SIM) loaded in mesoporous silica MCM-41 matrix (average pore diameter ~3.5 nm) accessed by a set of experimental techniques, evidencing that it exists in an amorphous state (X-ray diffraction, ssNMR, ATR-FTIR, and DSC). The most significant fraction of SIM molecules corresponds to a high thermal resistant population, as shown by thermogravimetry, and which interacts strongly with the MCM silanol groups, as revealed by ATR-FTIR analysis. These findings are supported by Molecular Dynamics (MD) simulations predicting that SIM molecules anchor to the inner pore wall through multiple hydrogen bonds. This anchored molecular fraction lacks a calorimetric and dielectric signature corresponding to a dynamically rigid population. Furthermore, differential scanning calorimetry showed a weak glass transition that is shifted to lower temperatures compared to bulk amorphous SIM. This accelerated molecular population is coherent with an in-pore fraction of molecules distinct from bulklike SIM, as highlighted by MD simulations. MCM-41 loading proved to be a suitable strategy for a long-term stabilization (at least three years) of simvastatin in the amorphous form, whose unanchored population releases at a much higher rate compared to the crystalline drug dissolution. Oppositely, the surface-attached molecules are kept entrapped inside pores even after long-term release assays.
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Affiliation(s)
- Teresa Cordeiro
- LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Inês Matos
- LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Florence Danède
- Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, F-59000 Lille, France
| | - João C Sotomayor
- LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Isabel M Fonseca
- LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - Marta C Corvo
- i3N|Cenimat, Materials Science Department, NOVA School of Science and Technology, NOVA University, 2829-516 Caparica, Portugal
| | - Madalena Dionísio
- LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - María Teresa Viciosa
- Centro de Química Estrutural, Institute of Molecular Sciences, Department of Chemical Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal
| | - Frédéric Affouard
- Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, F-59000 Lille, France
| | - Natália T Correia
- Univ. Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, F-59000 Lille, France
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3
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Guerain M, Affouard F, Henaff C, Dejoie C, Danède F, Siepman J, Siepman F, Willart JF. Structure determination of riboflavin by synchrotron high-resolution powder X-ray diffraction. Acta Crystallogr C Struct Chem 2021; 77:800-806. [PMID: 34864723 DOI: 10.1107/s2053229621012171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 11/16/2021] [Indexed: 11/10/2022] Open
Abstract
The crystal structure of the stable form of vitamin B2 or riboflavin (C17H20N4O6) was solved using high-resolution powder X-ray diffraction (PXRD). The high-resolution PXRD pattern of riboflavin was recorded at room temperature at the European Synchrotron Radiation Facility (Grenoble, France). The starting structural model was generated using a Monte Carlo simulated annealing method. The final structure was obtained through Rietveld refinement. The positions of the H atoms belonging to hydroxy groups were estimated from computational energy minimizations. The symmetry is orthorhombic with the space group P212121 and the following lattice parameters: a = 20.01308, b = 15.07337 and c = 5.31565 Å.
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Affiliation(s)
- Mathieu Guerain
- Université de Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, F-59000 Lille, France
| | - Frédéric Affouard
- Université de Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, F-59000 Lille, France
| | - Charline Henaff
- Université de Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, F-59000 Lille, France
| | - Catherine Dejoie
- European Synchrotron Radiation Facility, 71 avenue des Martyrs, 38000 Grenoble, France
| | - Florence Danède
- Université de Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, F-59000 Lille, France
| | - Juergen Siepman
- Université de Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - Florence Siepman
- Université de Lille, Inserm, CHU Lille, U1008, F-59000 Lille, France
| | - Jean François Willart
- Université de Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité Matériaux et Transformations, F-59000 Lille, France
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4
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Koperwas K, Tu W, Affouard F, Adrjanowicz K, Kaskosz F, Paluch M. Pressure Dependence of the Crystallization Rate for the S-Enantiomer and a Racemic Mixture of Ibuprofen. Cryst Growth Des 2021; 21:7075-7086. [PMID: 34880715 PMCID: PMC8641391 DOI: 10.1021/acs.cgd.1c00980] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 10/15/2021] [Indexed: 06/13/2023]
Abstract
This paper examines the pressure effect on the crystallization rate of the pharmaceutically active enantiomerically pure S-enantiomer and the racemic mixture of the well-known drug ibuprofen. Performed experimental studies revealed that at ambient pressure S-ibuprofen crystallizes faster than the racemic mixture. When the pressure increases, the crystallization rate slows down for both systems, but interestingly it is more apparent in the case of the S-enantiomer. It is found that this experimentally observed trend can be understood based on the predictions of the classical nucleation theory. We suggest that the solid-liquid interfacial free energy is the main reason for the observed variations in S- and RS-ibuprofen's stability behaviors. Employing a special method of computational studies, i.e., the capillary fluctuation method, we show that the increase in pressure affects the solid-liquid interfacial free energy for S- and RS-ibuprofen in an entirely different way. Importantly, the detected differences correspond to the experimentally observed variations in the overall crystallization rates.
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Affiliation(s)
- Kajetan Koperwas
- Institute
of Physics, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland
- Silesian
Center for Education and Interdisciplinary Research SMCEBI, 75 Pułku Piechoty 1a, 41-500 Chorzów, Poland
| | - Wenkang Tu
- Institute
of Physics, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland
- Silesian
Center for Education and Interdisciplinary Research SMCEBI, 75 Pułku Piechoty 1a, 41-500 Chorzów, Poland
| | - Frédéric Affouard
- Université
de Lille, CNRS, INRAE, Centrale Lille, UMR 8207 - UMET - Unité
Matériaux et Transformations, F-59000 Lille, France
| | - Karolina Adrjanowicz
- Institute
of Physics, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland
- Silesian
Center for Education and Interdisciplinary Research SMCEBI, 75 Pułku Piechoty 1a, 41-500 Chorzów, Poland
| | - Filip Kaskosz
- Institute
of Physics, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland
- Silesian
Center for Education and Interdisciplinary Research SMCEBI, 75 Pułku Piechoty 1a, 41-500 Chorzów, Poland
| | - Marian Paluch
- Institute
of Physics, University of Silesia in Katowice, 75 Pułku Piechoty 1, 41-500 Chorzów, Poland
- Silesian
Center for Education and Interdisciplinary Research SMCEBI, 75 Pułku Piechoty 1a, 41-500 Chorzów, Poland
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5
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Atawa B, Couvrat N, Affouard F, Correia NT, Coquerel G, Saiter-Fourcin A. Impact of chirality on the amorphous state of conglomerate forming systems: a case study of N-acetyl-α-methylbenzylamine. Phys Chem Chem Phys 2021; 23:24282-24293. [PMID: 34672303 DOI: 10.1039/d1cp03843e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present work aims at addressing the issue of molecular handedness in glassy and liquid states and its impact on heterogeneous equilibrium. For this purpose, we evaluated the glass forming ability (GFA), crystallization propensity, molecular mobility and hydrogen bonding structure of a chiral conglomerate forming system, N-acetyl-α-methylbenzylamine (Nac-MBA), at various enantiomeric excesses (ees) using experimental and computational techniques. We revealed that the rich relaxational landscape (Debye (D), α, βJG and ϒ) and the temperature dependence of the time scale of each process were insensitive to chirality. The most remarkable impact of chirality was expressed on the GFA and the recrystallization of heterochiral arrangements. In fact the GFA increases with decreasing ee, while the crystallization propensity increases with increasing ee. The counter enantiomer acted as a disruptor of crystallization and favored the glass formation upon cooling. The molecular dynamics simulation (MDS) results on the architecture of chiral sequences showed that homochiral sequences were more favorable when compared to heterochiral ones in the liquid state. However, this predisposition to form homochiral sequences in the liquid state was not the precursor of the future crystalline structure, since the liquid or the glassy system recrystallizes as heterochiral sequences. As per our understanding the crystallization was mostly controlled by the mean free migration path of an enantiomer to build homochiral or heterochiral sequences. In the present case, it seems that the mean free migration path achieved by an enantiomer for heterochiral sequences is shorter compared to homochiral arrangements in such a way that the crystallization of the metastable racemic compound is kinetically more favorable.
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Affiliation(s)
- Bienvenu Atawa
- Normandie Univ, UNIROUEN, INSA Rouen, CNRS, GPM, 76000 Rouen, France.,Normandie Univ, Univ Rouen Normandie, SMS-EA3233, Place Emile Blonde, 76130 Mont-Saint-Aignan, France.,Univ-Lyon, Université Lyon 1, Ingénierie des Matériaux Polymères, CNRS UMR 5223, 69622 Villeurbanne, France.
| | - Nicolas Couvrat
- Normandie Univ, Univ Rouen Normandie, SMS-EA3233, Place Emile Blonde, 76130 Mont-Saint-Aignan, France
| | - Frédéric Affouard
- Univ Lille, CNRS, INRA, ENSCL, UMR 8207, UMET, Unité Matériaux et Transformations, F59000 Lille, France
| | - Natália T Correia
- Univ Lille, CNRS, INRA, ENSCL, UMR 8207, UMET, Unité Matériaux et Transformations, F59000 Lille, France
| | - Gérard Coquerel
- Normandie Univ, Univ Rouen Normandie, SMS-EA3233, Place Emile Blonde, 76130 Mont-Saint-Aignan, France
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6
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Bama JA, Dudognon E, Affouard F. Impact of Low Concentration of Strongly Hydrogen-Bonded Water Molecules on the Dynamics of Amorphous Terfenadine: Insights from Molecular Dynamics Simulations and Dielectric Relaxation Spectroscopy. J Phys Chem B 2021; 125:11292-11307. [PMID: 34590855 DOI: 10.1021/acs.jpcb.1c06087] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The impact of low water concentration of strongly hydrogen-bonded water molecules on the dynamical properties of amorphous terfenadine (TFD) is investigated through complementary molecular dynamics (MD) simulations and dielectric relaxation spectroscopy (DRS) experiments. In this article, we especially highlight the important role played by some residual water molecules in the concentration of 1-2% (w/w) trapped in the TFD glassy matrix, which are particularly difficult to remove experimentally without a specific heating/drying process. From MD computations and analyses of the hydrogen bonding (HB) interactions, different categories of water molecules are revealed and particularly the presence of strongly HB water molecules. These latter localize themselves in small pockets in empty spaces existing in between the TFD molecules due to the poor packing of the glassy state and preferentially interact with the polar groups close to the flexible central part of the TFD molecules. We present a simple model which rationalizes at the molecular scale the effect of these strongly HB water molecules on dynamics and how they give rise to a supplementary relaxation process (namely process S) which is detected for the first time in the glassy state of TFD annealed at room temperature while this process is completely absent in a non-annealed glass. It also explains how this supplementary relaxation is coupled with the intramolecular motion (namely process γ) of the very flexible central part of the TFD molecule. The present findings help to understand more generally the microscopic origin of the secondary relaxations often detected by DRS in the glassy states of molecular compounds for which the exact nature is still debated.
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Affiliation(s)
- Jeanne-Annick Bama
- University Lille, CNRS, INRAE, Centrale Lille, UMR 8207-UMET-Unité Matériaux et Transformations, Lille F-59000, France
| | - Emeline Dudognon
- University Lille, CNRS, INRAE, Centrale Lille, UMR 8207-UMET-Unité Matériaux et Transformations, Lille F-59000, France
| | - Frédéric Affouard
- University Lille, CNRS, INRAE, Centrale Lille, UMR 8207-UMET-Unité Matériaux et Transformations, Lille F-59000, France
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7
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Guerain M, Derollez P, Roca-Paixão L, Dejoie C, Correia NT, Affouard F. Structure determination of a new cocrystal of carbamazepine and DL-tartaric acid by synchrotron powder X-ray diffraction. Acta Crystallogr C Struct Chem 2020; 76:225-230. [PMID: 32132279 DOI: 10.1107/s2053229620000868] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 01/23/2020] [Indexed: 11/10/2022]
Abstract
The crystal structure of a new cocrystal of carbamazepine (systematic name: 5H-dibenzo[b,f]azepine-5-carboxamide, C15H12N2O) and DL-tartaric acid (C4H6O6), obtained by liquid-assisted grinding, was solved by powder X-ray diffraction (PXRD). The high-resolution PXRD pattern of this new phase was recorded at room temperature thanks to synchrotron experiments at the European Synchrotron Radiation Facility (Grenoble, France). The starting structural model was generated by a Monte-Carlo simulated annealing method. The final structure was obtained through Rietveld refinement and an energy minimization simulation was used to estimate the H-atom positions. The stability of the proposed structure as a function of temperature was also assessed from molecular dynamics simulations. The symmetry is monoclinic (space group P21/c) and contains eight molecules per unit cell, namely, four DL-tartaric acid and four carbamazepine molecules.
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Affiliation(s)
- Mathieu Guerain
- Université Lille, CNRS, INRA, ENSCL, UMR 8207-UMET-Unité Matériaux et Transformations, F-59650 Villeneuve d'Ascq, France
| | - Patrick Derollez
- Université Lille, CNRS, INRA, ENSCL, UMR 8207-UMET-Unité Matériaux et Transformations, F-59650 Villeneuve d'Ascq, France
| | - Luisa Roca-Paixão
- Université Lille, CNRS, INRA, ENSCL, UMR 8207-UMET-Unité Matériaux et Transformations, F-59650 Villeneuve d'Ascq, France
| | - Catherine Dejoie
- European Synchrotron Radiation Facility, 71 avenue des Martyrs, 38000 Grenoble, France
| | - Natália T Correia
- Université Lille, CNRS, INRA, ENSCL, UMR 8207-UMET-Unité Matériaux et Transformations, F-59650 Villeneuve d'Ascq, France
| | - Frédéric Affouard
- Université Lille, CNRS, INRA, ENSCL, UMR 8207-UMET-Unité Matériaux et Transformations, F-59650 Villeneuve d'Ascq, France
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8
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Kiselev M, Idrissi A, Affouard F. The problems of solvation, complex formation and crystallization challenging the development of smart materials. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.112197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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9
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Dudognon E, Bama JA, Affouard F. Molecular Mobility of Terfenadine: Investigation by Dielectric Relaxation Spectroscopy and Molecular Dynamics Simulation. Mol Pharm 2019; 16:4711-4724. [PMID: 31589458 DOI: 10.1021/acs.molpharmaceut.9b00877] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The molecular mobility of an amorphous active pharmaceutical ingredient, terfenadine, was carefully investigated by dielectric relaxation spectroscopy and molecular dynamics simulation for the first time. Comprehensive characterization on a wide frequency (10-2 to 109 Hz) and temperature (300 K) range highlights the fragile nature of this good glass-former (m = 112) and the relatively large nonexponentiality of the main relaxation (βKWW = 0.53 ± 0.01). In the glassy state, a particularly broad secondary relaxation of intramolecular origin is evidenced. Terfenadine is a flexible molecule, and from molecular dynamics simulation, a clear link is established between the flexibility of the central part of the molecule (carrying, on the one side, the nitrogen group, and on the other side, the OH group) and the distribution of dipole moments, which explains that broadness. Terfenadine is one of the very few cases for which the molecular mobility of the glass obtained by the quench of the melt or by milling can be compared. From the present study, no major difference in terms of molecular mobility is found between these two glasses. However, terfenadine amorphized by milling (for 1-20 h) clearly shows a lower stability than the quenched liquid as we observed its recrystallization upon heating. Interestingly, it is shown that this recrystallization upon heating is not complete and that the 1-2% of the remaining amorphous phase has an original behavior. Indeed, it exhibits an enhanced main mobility induced by an autoconfinement effect created by the surrounding crystalline phase.
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Affiliation(s)
- Emeline Dudognon
- Univ. Lille , CNRS, INRA, ENSCL, UMR 8207-UMET-Unité Matériaux Et Transformations , F-59000 Lille , France
| | - Jeanne-Annick Bama
- Univ. Lille , CNRS, INRA, ENSCL, UMR 8207-UMET-Unité Matériaux Et Transformations , F-59000 Lille , France
| | - Frédéric Affouard
- Univ. Lille , CNRS, INRA, ENSCL, UMR 8207-UMET-Unité Matériaux Et Transformations , F-59000 Lille , France
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10
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Atawa B, Correia NT, Couvrat N, Affouard F, Coquerel G, Dargent E, Saiter A. Molecular mobility of amorphous N-acetyl-α-methylbenzylamine and Debye relaxation evidenced by dielectric relaxation spectroscopy and molecular dynamics simulations. Phys Chem Chem Phys 2019; 21:702-717. [DOI: 10.1039/c8cp04880k] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Molecular mobility of NAC-MBA molecule is described by means of DRS, FSC and MD simulations.
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11
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Abstract
A combination of the excess enthalpy with the fusion entropy of the pure coformer is suggested to be of interest for coformers screening in order to form a multicomponent system with a given API (cocrystal/co-amorphous).
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Affiliation(s)
- Luisa Roca-Paixão
- Univ. Lille
- CNRS
- INRA
- ENSCL
- UMR 8207 – UMET – Unité Matériaux et Transformations
| | - Natália T. Correia
- Univ. Lille
- CNRS
- INRA
- ENSCL
- UMR 8207 – UMET – Unité Matériaux et Transformations
| | - Frédéric Affouard
- Univ. Lille
- CNRS
- INRA
- ENSCL
- UMR 8207 – UMET – Unité Matériaux et Transformations
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12
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Bourdet A, Esposito A, Thiyagarajan S, Delbreilh L, Affouard F, Knoop RJI, Dargent E. Molecular Mobility in Amorphous Biobased Poly(ethylene 2,5-furandicarboxylate) and Poly(ethylene 2,4-furandicarboxylate). Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00108] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Aurélie Bourdet
- Groupe de Physique des Matériaux, Normandie Univ, UNIROUEN Normandie, INSA Rouen, CNRS, 76000 Rouen, France
| | - Antonella Esposito
- Groupe de Physique des Matériaux, Normandie Univ, UNIROUEN Normandie, INSA Rouen, CNRS, 76000 Rouen, France
| | | | - Laurent Delbreilh
- Groupe de Physique des Matériaux, Normandie Univ, UNIROUEN Normandie, INSA Rouen, CNRS, 76000 Rouen, France
| | - Frédéric Affouard
- UMET, UMR CNRS 8207, Université Lille 1, 59655 Villeneuve d’Ascq, France
| | - Rutger J. I. Knoop
- Wageningen Food & Biobased Research, P.O. Box 17, 6700 AA Wageningen, The Netherlands
| | - Eric Dargent
- Groupe de Physique des Matériaux, Normandie Univ, UNIROUEN Normandie, INSA Rouen, CNRS, 76000 Rouen, France
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13
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Valdès LC, Gerges J, Mizuguchi T, Affouard F. Crystallization tendencies of modelled Lennard-Jones liquids with different attractions. J Chem Phys 2018; 148:014501. [DOI: 10.1063/1.5004659] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Affiliation(s)
- L.-C. Valdès
- Unité Matériaux et Transformations (UMET), UMR CNRS 8207, UFR de Physique, BAT P5, Université Lille 1, 59655 Villeneuve d’Ascq, France
| | - J. Gerges
- Unité Matériaux et Transformations (UMET), UMR CNRS 8207, UFR de Physique, BAT P5, Université Lille 1, 59655 Villeneuve d’Ascq, France
| | - T. Mizuguchi
- Unité Matériaux et Transformations (UMET), UMR CNRS 8207, UFR de Physique, BAT P5, Université Lille 1, 59655 Villeneuve d’Ascq, France
- Institute for the Promotion of University Strategy, Kyoto Institute of Technology, Kyoto 606-8585, Japan
| | - F. Affouard
- Unité Matériaux et Transformations (UMET), UMR CNRS 8207, UFR de Physique, BAT P5, Université Lille 1, 59655 Villeneuve d’Ascq, France
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14
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Ottou Abe MT, Viciosa MT, Correia NT, Affouard F. Impact of chirality on peculiar ibuprofen molecular dynamics: hydrogen bonding organization and syn vs. anti carboxylic group conformations. Phys Chem Chem Phys 2018; 20:29528-29538. [PMID: 30457612 DOI: 10.1039/c8cp04837a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Impact of chirality (R and S enantiomers) on syn vs. anti carboxylic group conformations, hydrogen bond dimers and peculiar ibuprofen molecular dynamics.
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Affiliation(s)
| | - María Teresa Viciosa
- CQFM and IN,CQE
- Instituto Superior Técnico
- Universidade de Lisboa
- 1049-001 Lisboa
- Portugal
| | - Natália T. Correia
- Univ. Lille
- CNRS
- INRA
- ENSCL
- UMR 8207 – UMET – Unité Matériaux et Transformations
| | - Frédéric Affouard
- Univ. Lille
- CNRS
- INRA
- ENSCL
- UMR 8207 – UMET – Unité Matériaux et Transformations
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15
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Lerbret A, Affouard F. Molecular Packing, Hydrogen Bonding, and Fast Dynamics in Lysozyme/Trehalose/Glycerol and Trehalose/Glycerol Glasses at Low Hydration. J Phys Chem B 2017; 121:9437-9451. [PMID: 28920435 DOI: 10.1021/acs.jpcb.7b07082] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Water and glycerol are well-known to facilitate the structural relaxation of amorphous protein matrices. However, several studies evidenced that they may also limit fast (∼picosecond-nanosecond, ps-ns) and small-amplitude (∼Å) motions of proteins, which govern their stability in freeze-dried sugar mixtures. To determine how they interact with proteins and sugars in glassy matrices and, thereby, modulate their fast dynamics, we performed molecular dynamics (MD) simulations of lysozyme/trehalose/glycerol (LTG) and trehalose/glycerol (TG) mixtures at low glycerol and water concentrations. Upon addition of glycerol and/or water, the glass transition temperature, Tg, of LTG and TG mixtures decreases, the molecular packing of glasses is improved, and the mean-square displacements (MSDs) of lysozyme and trehalose either decrease or increase, depending on the time scale and on the temperature considered. A detailed analysis of the hydrogen bonds (HBs) formed between species reveals that water and glycerol may antiplasticize the fast dynamics of lysozyme and trehalose by increasing the total number and/or the strength of the HBs they form in glassy matrices.
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Affiliation(s)
- Adrien Lerbret
- Univ. Bourgogne Franche-Comté, AgroSup Dijon, UMR A 02.102, PAM, Procédés Alimentaires et Microbiologiques, F-21000 Dijon, France
| | - Frédéric Affouard
- Univ. Lille, CNRS, UMR 8207, UMET, Unité Matériaux Et Transformations, F-59000 Lille, France
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16
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Ottou Abe MT, Correia NT, Ndjaka JMB, Affouard F. A comparative study of ibuprofen and ketoprofen glass-forming liquids by molecular dynamics simulations. J Chem Phys 2016; 143:164506. [PMID: 26520526 DOI: 10.1063/1.4933430] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this paper, structural and dynamical properties of ibuprofen and ketoprofen glass-forming liquids have been investigated by means of molecular dynamics simulations. Molecular mobility of both materials is analyzed with respect to the different inter-molecular linear/cyclic hydrogen bonding associations. For ibuprofen, the dominant organization is found to be composed of small hydrogen bonding aggregates corresponding to cyclic dimers through the carboxyl group. For ketoprofen, the propensity of cyclic dimers is significantly reduced by the formation of hydrogen bonds with the ketone oxygen of the molecule altering the hydrogen bond (HB) associating structures that can be formed and thus molecular dynamics. The issue of the presence/absence of the peculiar low frequency Debye-type process in dielectric relaxation spectroscopy (DRS) data in these materials is addressed. Results obtained from simulations confirm that the Debye process originates from the internal cis-trans conversion of the -COOH carboxyl group. It is shown that the specific intermolecular HB structures associated to a given profen control the main dynamical features of this conversion, in particular its separation from the α-process, which make it detectable or not from DRS. For ibuprofen, the possible role of the -CCCO torsion motion, more "local" than the -COOH motion since it is less influenced by the intermolecular HBs, is suggested in the microscopic origin of the quite intense secondary γ-relaxation process detected from DRS.
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Affiliation(s)
- M T Ottou Abe
- Unité Matériaux et Transformation (UMET), UMR CNRS 8207, UFR de Physique, BAT P5, Université Lille 1, 59655 Villeneuve d'Ascq, France
| | - N T Correia
- Unité Matériaux et Transformation (UMET), UMR CNRS 8207, UFR de Physique, BAT P5, Université Lille 1, 59655 Villeneuve d'Ascq, France
| | - J M B Ndjaka
- Département de Physique, Faculté des Sciences, Université de Yaoundé I, B.P. 812, Yaoundé, Cameroun
| | - F Affouard
- Unité Matériaux et Transformation (UMET), UMR CNRS 8207, UFR de Physique, BAT P5, Université Lille 1, 59655 Villeneuve d'Ascq, France
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17
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Gerges J, Affouard F. Predictive Calculation of the Crystallization Tendency of Model Pharmaceuticals in the Supercooled State from Molecular Dynamics Simulations. J Phys Chem B 2015; 119:10768-83. [DOI: 10.1021/acs.jpcb.5b05557] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. Gerges
- Unité
Matériaux
et Transformations (UMET), UMR CNRS 8207, UFR de Physique, BAT P5, Université de Lille 1, 59655 Villeneuve d’ascq, France
| | - F. Affouard
- Unité
Matériaux
et Transformations (UMET), UMR CNRS 8207, UFR de Physique, BAT P5, Université de Lille 1, 59655 Villeneuve d’ascq, France
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18
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Rodrigues AC, Viciosa MT, Danède F, Affouard F, Correia NT. Molecular Mobility of Amorphous S-Flurbiprofen: A Dielectric Relaxation Spectroscopy Approach. Mol Pharm 2013; 11:112-30. [DOI: 10.1021/mp4002188] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A. C. Rodrigues
- REQUIMTE/CQFB, Departamento de Química, Faculdade
de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
| | - M. T. Viciosa
- CQFM − Centro
de Química-Física Molecular and IN − Institute
of Nanoscience and Nanotechnology, Instituto Superior Técnico, Universidade de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
| | - F. Danède
- Unité Matériaux et Transformation (UMET), UMR CNRS
8207, UFR de Physique, BAT P5, Université Lille 1, 59655 Villeneuve d’Ascq, France
| | - F. Affouard
- Unité Matériaux et Transformation (UMET), UMR CNRS
8207, UFR de Physique, BAT P5, Université Lille 1, 59655 Villeneuve d’Ascq, France
| | - N. T. Correia
- REQUIMTE/CQFB, Departamento de Química, Faculdade
de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
- Unité Matériaux et Transformation (UMET), UMR CNRS
8207, UFR de Physique, BAT P5, Université Lille 1, 59655 Villeneuve d’Ascq, France
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19
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Lerbret A, Affouard F, Hédoux A, Krenzlin S, Siepmann J, Bellissent-Funel MC, Descamps M. How strongly does trehalose interact with lysozyme in the solid state? Insights from molecular dynamics simulation and inelastic neutron scattering. J Phys Chem B 2012; 116:11103-16. [PMID: 22894179 DOI: 10.1021/jp3058096] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Therapeutic proteins are usually conserved in glassy matrixes composed of stabilizing excipients and a small amount of water, which both control their long-term stability, and thus their potential use in medical treatments. To shed some light on the protein-matrix interactions in such systems, we performed molecular dynamics (MD) simulations on matrixes of (i) the model globular protein lysozyme (L), (ii) the well-known bioprotectant trehalose (T), and (iii) the 1:1 (in weight) lysozyme/trehalose mixture (LT), at hydration levels h of 0.0, 0.075, and 0.15 (in g of water/g of protein or sugar). We also supplemented these simulations with complementary inelastic neutron scattering (INS) experiments on the L, T, and LT lyophilized (freeze-dried) samples. The densities and free volume distributions indicate that trehalose improves the molecular packing of the LT glass with respect to the L one. Accordingly, the low-frequency vibrational densities of states (VDOS) and the mean square displacements (MSDs) of lysozyme reveal that it is less flexible-and thus less likely to unfold-in the presence of trehalose. Furthermore, at low contents (h = 0.075), water systematically stiffens the vibrational motions of lysozyme and trehalose, whereas it increases their MSDs on the nanosecond (ns) time scale. This stems from the hydrogen bonds (HBs) that lysozyme and trehalose form with water, which, interestingly, are stronger than the ones they form with each other but which, nonetheless, relax faster on the ns time scale, given the larger mobility of water. Moreover, lysozyme interacts preferentially with water in the hydrated LT mixtures, and trehalose appears to slow down significantly the relaxation of lysozyme-water HBs. Overall, our results suggest that the stabilizing efficiency of trehalose arises from its ability to (i) increase the number of HBs formed by proteins in the dry state and (ii) make the HBs formed by water with proteins stable on long (>ns) time scales.
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Affiliation(s)
- Adrien Lerbret
- Unité Matériaux Et Transformations, UMR CNRS 8207, Université Lille Nord de France, USTL, 59655 Villeneuve d'Ascq, France.
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20
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Derollez P, Guinet Y, Affouard F, Danède F, Carpentier L, Hédoux A. Structure determination of L-arabinitol by powder X-ray diffraction. Acta Crystallogr B Struct Sci 2012; 68:407-11. [PMID: 22810910 DOI: 10.1107/s0108768112019994] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2012] [Accepted: 05/03/2012] [Indexed: 11/10/2022]
Abstract
Powder X-ray diffraction patterns of the commercial phase of L-arabinitol were recorded with a laboratory diffractometer. The starting structural model was found by a Monte-Carlo simulated annealing method. The final structure was obtained through Rietveld refinements with soft restraints on the interatomic bond lengths and bond angles. H atoms of hydroxyl groups were localized by minimization of the crystalline energy. The cell is triclinic with the space group P1 and contains two molecules. The crystalline cohesion is achieved by an important network of O—H...O hydrogen bonds.
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21
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Sengupta S, Vasconcelos F, Affouard F, Sastry S. Dependence of the fragility of a glass former on the softness of interparticle interactions. J Chem Phys 2012; 135:194503. [PMID: 22112088 DOI: 10.1063/1.3660201] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
We study the influence of the softness of the interparticle interactions on the fragility of a glass former by considering three model binary mixture glass formers. The interaction potential between particles is a modified Lennard-Jones type potential, with the repulsive part of the potential varying with an inverse power q of the interparticle distance, and the attractive part varying with an inverse power p. We consider the combinations (12,11) (model I), (12,6) (model II), and (8,5) (model III) for (q,p) such that the interaction potential becomes softer from model I to III. We evaluate the kinetic fragilities from the temperature variation of diffusion coefficients and relaxation times, and a thermodynamic fragility from the temperature variation of the configurational entropy. We find that the kinetic fragility increases with increasing softness of the potential, consistent with previous results for these model systems, but at variance with the thermodynamic fragility, which decreases with increasing softness of the interactions, as well as expectations from earlier results. We rationalize our results by considering the full form of the Adam-Gibbs relation, which requires, in addition to the temperature dependence of the configurational entropy, knowledge of the high temperature activation energies in order to determine fragility. We show that consideration of the scaling of the high temperature activation energy with the liquid density, analyzed in recent studies, provides a partial rationalization of the observed behavior.
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Affiliation(s)
- Shiladitya Sengupta
- Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur Campus, Bangalore 560 064, India
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22
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Abstract
We have combined incoherent quasielastic neutron scattering experiments and atomistic molecular simulations to investigate the microscopic dynamics of glycerol moving away from the hydrodynamic limit. We relate changes in the momentum transfer (Q) dependence of the relaxation time to distinct changes of the single-particle dynamics. Going from small to large values of Q, a first crossover at about 0.5 Å(-1) is related to the coupling of the translational diffusion dynamics to the non-Debye structural relaxation, while the second crossover at a Q-value near the main diffraction peak is associated with the Gaussian to non-Gaussian crossover of the short-time molecular dynamics, related to the decaging processes. We offer an unprecedented extension of previous studies on polymeric systems towards the case of the typical low-molecular-weight glass-forming system glycerol.
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Affiliation(s)
- R Busselez
- Institute of Physics of Rennes, CNRS-University of Rennes 1, UMR 6251, F-35042 Rennes, France
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23
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Affiliation(s)
- F. Affouard
- Unité Matériaux et Transformation (UMET), UMR CNRS 8207, UFR de Physique, BAT P5, Université Lille 1, 59655 Villeneuve d’Ascq, France
| | - Natália T. Correia
- REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal
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24
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Seo JA, Hédoux A, Guinet Y, Paccou L, Affouard F, Lerbret A, Descamps M. Thermal denaturation of beta-lactoglobulin and stabilization mechanism by trehalose analyzed from Raman spectroscopy investigations. J Phys Chem B 2010; 114:6675-84. [PMID: 20411964 DOI: 10.1021/jp1006022] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The thermal denaturation process of beta-lactoglobulin has been analyzed in the 20-100 degrees C temperature range by Raman spectroscopy experiments simultaneously performed in the region of amide modes (800-1800 cm(-1)) and in the low-frequency range (10-350 cm(-1)). The analysis of amide modes reveals a two-step thermal denaturation process in the investigated temperature range. The first step corresponds to the dissociation of dimers associated with an increase of flexibility of the tertiary structure. In the second step, large conformational changes are detected in the secondary structure and described as a loss of alpha-helix structures and a concomitant formation of beta-sheets. Raman investigations in the low-frequency range provide important information on the origin of the denaturation process through the analysis of the solvent dynamics and its coupling with that of the protein. The softening of the tetrahedral structure of water induces the dissociation of dimers and makes the tertiary structure softer, leading to the water penetration in the protein interior. The methodology based on Raman investigations of amide modes and in the low-frequency region was used to analyze the mechanism of beta-lactoglobulin thermostabilization by trehalose. The main effect of trehalose is determined to be related to its capabilities to distort the tetrahedral organization of water molecules.
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Affiliation(s)
- Jeong-Ah Seo
- Unité Matériaux Et Transformations, UMR CNRS 8207, Université de Lille 1, 59655 Villeneuve d Ascq Cédex, France
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25
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Magazù S, Migliardo F, Affouard F, Descamps M, Telling MTF. Study of the relaxational and vibrational dynamics of bioprotectant glass-forming mixtures by neutron scattering and molecular dynamics simulation. J Chem Phys 2010. [DOI: 10.1063/1.3407428] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
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26
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Derollez P, Dudognon E, Affouard F, Danède F, Correia NT, Descamps M. Ab initio structure determination of phase II of racemic ibuprofen by X-ray powder diffraction. Acta Crystallogr B Struct Sci 2010; 66:76-80. [DOI: 10.1107/s0108768109047363] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2009] [Accepted: 11/09/2009] [Indexed: 11/10/2022]
Abstract
Annealing of the quenched ibuprofen at 258 K yielded a new crystalline form, called phase II. Powder X-ray diffraction patterns of this phase II were recorded with a laboratory diffractometer equipped with an INEL G3000 goniometer and a curved position-sensitive detector CPS120. The starting structural model was found by a Monte-Carlo simulated annealing method. The final structure was obtained through Rietveld refinements with rigid-body constraints for the phenyl group and soft restraints on the other interatomic bond lengths and bond angles. The cell volume is 5% larger than that of the conventional phase I at 258 K. It is also shown that the orientation of the propanoic acid group is drastically changed with respect to phase I, leading to strong modifications of the orientation of the O—H...O hydrogen bonds with respect to the chains of dimers. These structural considerations could explain the metastable character of this phase II.
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27
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Lerbret A, Affouard F, Bordat P, Hédoux A, Guinet Y, Descamps M. Low-frequency vibrational properties of lysozyme in sugar aqueous solutions: A Raman scattering and molecular dynamics simulation study. J Chem Phys 2009; 131:245103. [DOI: 10.1063/1.3273218] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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28
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Hédoux A, Willart JF, Paccou L, Guinet Y, Affouard F, Lerbret A, Descamps M. Thermostabilization mechanism of bovine serum albumin by trehalose. J Phys Chem B 2009; 113:6119-26. [PMID: 19385694 DOI: 10.1021/jp900330r] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Thermal denaturation of bovine serum albumin (BSA) is analyzed from differential scanning calorimetry (DSC) and Raman spectroscopy investigations. DSC curves exhibit a marked dependence on protein concentration. BSA thermal denaturation becomes broader and bimodal, and the temperature of denaturation increases with increasing protein concentration. Raman scattering investigations simultaneously carried out in the low-frequency range (10-350 cm(-1)) and in the amide I band region (1500-1800 cm(-1)) indicate that the denaturation process is described as a biphasic process independent of protein concentration. The dependence of the protein stability upon the protein concentration can be interpreted from the coupling of protein and solvent dynamics. The confrontation of previous results obtained from Raman investigations on lysozyme (LYS) and the present study of BSA brings out significant information on protein dynamics and the coupling of protein and hydration-water dynamics in relation with the solvent accessible surface area. Contrary to LYS, the modification of the dynamics of hydration water by the protein is clearly observed on BSA. The influence of trehalose on the protein dynamics was analyzed. We found that trehalose reduces the dynamic fluctuations of polar side chains at the protein-solvent interface. The mechanism of thermostabilization by trehalose is related to the reduction of the exposure of hydrophobic groups of BSA to the water molecules, and to a strengthening of intermolecular O-H interactions in the hydrogen-bond network of water, leading to the stabilization of the tertiary structure.
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Affiliation(s)
- Alain Hédoux
- Laboratoire de Dynamique et Structure des Materiaux Moleculaires, UMR CNRS 8024, UFR de Physique, Universite de Lille 1, Bat. P5, 59 655 Villeneuve d'Ascq Cedex, France
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29
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Affouard F, Descamps M, Valdes LC, Habasaki J, Bordat P, Ngai KL. Breakdown of the Stokes–Einstein relation in Lennard-Jones glassforming mixtures with different interaction potential. J Chem Phys 2009. [DOI: 10.1063/1.3204063] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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31
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Busselez R, Lefort R, Ji Q, Affouard F, Morineau D. Molecular dynamics simulation of nanoconfined glycerol. Phys Chem Chem Phys 2009; 11:11127-33. [DOI: 10.1039/b911859d] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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32
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Magazù S, Maisano G, Migliardo F, Galli G, Benedetto A, Morineau D, Affouard F, Descamps M. Characterization of molecular motions in biomolecular systems by elastic incoherent neutron scattering. J Chem Phys 2008; 129:155103. [DOI: 10.1063/1.2989804] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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33
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Brás AR, Noronha JP, Antunes AMM, Cardoso MM, Schönhals A, Affouard F, Dionísio M, Correia NT. Molecular Motions in Amorphous Ibuprofen As Studied by Broadband Dielectric Spectroscopy. J Phys Chem B 2008; 112:11087-99. [DOI: 10.1021/jp8040428] [Citation(s) in RCA: 136] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ana R. Brás
- Requimte, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal, Federal Institute of Materials Research and Testing (BAM), Unter den Eichen 87, D-12205 Berlin, Germany, and Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UMR CNRS 8024, UFR de Physique, BAT P5, Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq, France
| | - João P. Noronha
- Requimte, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal, Federal Institute of Materials Research and Testing (BAM), Unter den Eichen 87, D-12205 Berlin, Germany, and Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UMR CNRS 8024, UFR de Physique, BAT P5, Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq, France
| | - Alexandra M. M. Antunes
- Requimte, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal, Federal Institute of Materials Research and Testing (BAM), Unter den Eichen 87, D-12205 Berlin, Germany, and Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UMR CNRS 8024, UFR de Physique, BAT P5, Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq, France
| | - Maria M. Cardoso
- Requimte, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal, Federal Institute of Materials Research and Testing (BAM), Unter den Eichen 87, D-12205 Berlin, Germany, and Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UMR CNRS 8024, UFR de Physique, BAT P5, Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq, France
| | - Andreas Schönhals
- Requimte, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal, Federal Institute of Materials Research and Testing (BAM), Unter den Eichen 87, D-12205 Berlin, Germany, and Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UMR CNRS 8024, UFR de Physique, BAT P5, Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq, France
| | - Frédéric Affouard
- Requimte, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal, Federal Institute of Materials Research and Testing (BAM), Unter den Eichen 87, D-12205 Berlin, Germany, and Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UMR CNRS 8024, UFR de Physique, BAT P5, Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq, France
| | - Madalena Dionísio
- Requimte, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal, Federal Institute of Materials Research and Testing (BAM), Unter den Eichen 87, D-12205 Berlin, Germany, and Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UMR CNRS 8024, UFR de Physique, BAT P5, Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq, France
| | - Natália T. Correia
- Requimte, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal, Federal Institute of Materials Research and Testing (BAM), Unter den Eichen 87, D-12205 Berlin, Germany, and Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UMR CNRS 8024, UFR de Physique, BAT P5, Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq, France
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Hédoux A, Ionov R, Willart JF, Lerbret A, Affouard F, Guinet Y, Descamps M, Prévost D, Paccou L, Danéde F. Evidence of a two-stage thermal denaturation process in lysozyme: a Raman scattering and differential scanning calorimetry investigation. J Chem Phys 2007; 124:14703. [PMID: 16409047 DOI: 10.1063/1.2139087] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Raman spectroscopy (in the low-frequency range and the amide I band region) and modulated differential scanning calorimetry investigations have been used to analyze temperature-induced structural changes in lysozyme dissolved in 1H2O and 2H2O in the thermal denaturation process. Low-frequency Raman data reveal a change in tertiary structure without concomitant unfolding of the secondary structure. Calorimetric data show that this structural change is responsible for the configurational entropy change associated with the strong-to-fragile liquid transition and correspond to about 1/3 of the native-denaturated transition enthalpy. This is the first stage of the thermal denaturation which is a precursor of the secondary structure change and is determined to be strongly dependent on the stability of the hydrogen-bond network in water. Low-frequency Raman spectroscopy provides information on the flexibility of the tertiary structure (in the native state and the transient folding state) in relation to the fragility of the mixture. The unfolding of the secondary structure appears as a consequence of the change in the tertiary structure and independent of the solvent. Protein conformational stability is directly dependent on the stability of the native tertiary structure. The structural transformation of tertiary structure can be detected through the enhanced 1H/2H exchange inhibited in native proteins. Taking into account similar features reported in the literature observed for different proteins it can be considered that the two-stage transformation observed in lysozyme dissolved in water is a general mechanism for the thermal denaturation of proteins.
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Affiliation(s)
- A Hédoux
- Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UMR CNRS 8024, UFR de Physique Bâtiment P5, 59655 Villeneuve d'Ascq Cedex, France.
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Lerbret A, Bordat P, Affouard F, Hédoux A, Guinet Y, Descamps M. How Do Trehalose, Maltose, and Sucrose Influence Some Structural and Dynamical Properties of Lysozyme? Insight from Molecular Dynamics Simulations. J Phys Chem B 2007; 111:9410-20. [PMID: 17629322 DOI: 10.1021/jp071946z] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The influence of three well-known disaccharides, namely, trehalose, maltose, and sucrose, on some structural and dynamical properties of lysozyme has been investigated by means of molecular dynamics computer simulations in the 37-60 wt % concentration range. The effects of sugars on the protein conformation are found to be relatively weak, in agreement with the preferential hydration of lysozyme. Conversely, sugars seem to increase significantly the relaxation times of the protein. These effects are shown to be correlated to the fractional solvent accessibilities of lysozyme residues and further support the slaving of protein dynamics. Moreover, a significant increase in the relaxation times of lysozyme, sugars, and water molecules is observed within the studied concentration range and may result from the percolation of the hydrogen-bond network of sugar molecules. This percolation appears to be of primary importance to explain the influence of sugars on the dynamical properties of lysozyme and water.
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Affiliation(s)
- A Lerbret
- Department of Food Science, Cornell University, Stocking Hall, Ithaca, New York 14853, USA.
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Lerbret A, Bordat P, Affouard F, Descamps M, Migliardo F. How homogeneous are the trehalose, maltose, and sucrose water solutions? An insight from molecular dynamics simulations. J Phys Chem B 2007; 109:11046-57. [PMID: 16852346 DOI: 10.1021/jp0468657] [Citation(s) in RCA: 176] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The structural properties resulting from the reciprocal influence between water and three well-known homologous disaccharides, namely, trehalose, maltose, and sucrose, in aqueous solutions have been investigated in the 4-66 wt % concentration range by means of molecular dynamics computer simulations. Hydration numbers clearly show that trehalose binds to a larger number of water molecules than do maltose or sucrose, thus affecting the water structure to a deeper extent. Two-dimensional radial distribution functions of trehalose solutions definitely reveal that water is preferentially localized at the hydration sites found in the trehalose dihydrate crystal, this tendency being enhanced when increasing trehalose concentration. Over a rather wide concentration range (4-49 wt %), the fluctuations of the radius of gyration and of the glycosidic dihedral angles of trehalose indicate a higher flexibility with respect to maltose and sucrose. At sugar concentrations between 33 and 66 wt %, the mean sugar cluster size and the number of sugar-sugar hydrogen bonds formed within sugar clusters reveal that trehalose is able to form larger clusters than sucrose but smaller than maltose. These features suggest that trehalose-water mixtures would be more homogeneous than the two others, thus reducing both desiccation stresses and ice formation.
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Affiliation(s)
- A Lerbret
- Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UMR CNRS 8024, Université Lille I, 59655 Villeneuve d'Ascq Cedex, France.
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Hédoux A, Willart JF, Ionov R, Affouard F, Guinet Y, Paccou L, Lerbret A, Descamps M. Analysis of sugar bioprotective mechanisms on the thermal denaturation of lysozyme from Raman scattering and differential scanning calorimetry investigations. J Phys Chem B 2007; 110:22886-93. [PMID: 17092040 DOI: 10.1021/jp061568i] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Sugar-induced thermostabilization of lysozyme was analyzed by Raman scattering and modulated differential scanning calorimetry investigations, for three disaccharides (maltose, sucrose, and trehalose) characterized by the same chemical formula (C(12)H(22)O(11)). This study shows that trehalose is the most effective in stabilizing the folded secondary structure of the protein. The influence of sugars on the mechanism of thermal denaturation was carefully investigated by Raman scattering experiments carried out both in the low-frequency range and in the amide I band region. It was determined that the thermal stability of the hydrogen-bond network of water, highly dependent on the presence of sugars, contributes to the stabilization of the native tertiary structure and inhibits the first stage of denaturation, that is, the transformation of the tertiary structure into a highly flexible state with intact secondary structure. It was found that trehalose exhibits exceptional capabilities to distort the tetra-bonded hydrogen-bond network of water and to strengthen intermolecular O-H interactions responsible for the stability of the tertiary structure. Trehalose was also observed to be the best stabilizer of the folded secondary structure, in the transient tertiary structure, leading to a high-temperature shift of the unfolding process (the second stage of denaturation). This was interpreted from the consideration that the transient tertiary structure is less flexible and inhibits the solvent accessibility around the hydrophobic groups of lysozyme.
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Affiliation(s)
- A Hédoux
- Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UMR CNRS 8024, Université de Lille 1, UFR de Physique, Bat. P5, 59 655 Villeneuve d'Ascq Cedex, France.
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Affouard F, Cochin E, Danède F, Decressain R, Descamps M, Haeussler W. Onset of slow dynamics in difluorotetrachloroethane glassy crystal. J Chem Phys 2005; 123:084501. [PMID: 16164306 DOI: 10.1063/1.1990111] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Complementary neutron spin-echo and x-ray experiments and molecular-dynamics simulations have been performed on difluorotetrachloroethane (CFCl2-CFCl2) glassy crystal. Static, single-molecule reorientational dynamics and collective dynamics properties are investigated. Our results confirm the strong analogy between molecular liquids and plastic crystals. The orientational disorder is characterized at different temperatures and a change in the nature of rotational dynamics is observed. A careful check of the rotational diffusion model is performed using self-angular correlation functions Cl with high l values and compared to results obtained on molecular liquids composed of A-B dumbbells. Below the crossover temperature at which slow dynamics emerge, we show that some scaling predictions of the mode coupling theory hold and that alpha-relaxation times and nonergodicity parameters are controlled by the nontrivial static correlations.
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Affiliation(s)
- F Affouard
- Laboratoire de Dynamique et Structure des Matériaux Moléculaires, Centre National de la Recherche Scientifique (CNRS) Unité Mixte de Recherche (UMR) 8024, Université Lille 1, 59655 Villeneuve d'Ascq Cedex, France.
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Lefebvre J, Willart JF, Caron V, Lefort R, Affouard F, Danède F. Structure determination of the 1/1 α/β mixed lactose by X-ray powder diffraction. Acta Crystallogr B Struct Sci 2005; 61:455-63. [PMID: 16041096 DOI: 10.1107/s0108768105017064] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2005] [Accepted: 05/30/2005] [Indexed: 11/11/2022]
Abstract
The mixed form of α/β lactose was obtained by heating amorphous α-lactose at 443 K. NMR spectroscopy determined the stoichiometry of this mixed compound to be 1/1. The X-ray powder diffraction pattern was recorded at room temperature with a sensitive curved detector (CPS 120). The structure was solved by real-space methods (simulated annealing) followed by Rietveld refinements with soft constraints on bond lengths and bond angles. The H atoms of the hydroxyl groups were localized by minimization of the crystalline energy. The cell of 1/1 α/β lactose is triclinic with the space group P1 and contains two molecules (one molecule of each anomer). The crystalline cohesion is achieved by networks of O—H...O hydrogen bonds. The width of the Bragg peaks is interpreted through a microstructural approach in terms of isotropic strain effects and anisotropic size effects.
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Affiliation(s)
- Jacques Lefebvre
- Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UMR CNRS 8024, UFR de Physique, Bâtiment P5, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq CEDEX, France.
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Affouard F, Descamps M. Analogy of the slow dynamics between the supercooled liquid and supercooled plastic crystal states of difluorotetrachloroethane. Phys Rev E Stat Nonlin Soft Matter Phys 2005; 72:012501. [PMID: 16090015 DOI: 10.1103/physreve.72.012501] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2005] [Indexed: 05/03/2023]
Abstract
Slow dynamics of difluorotetrachloroethane in both supercooled plastic crystal and supercooled liquid states have been investigated with molecular dynamics simulations. The temperature and wave-vector dependence of collective dynamics in both states are probed using coherent dynamical scattering functions S (Q,t). Our results confirm the strong analogy between molecular liquids and plastic crystals for which alpha-relaxation times and nonergodicity parameters are controlled by the nontrivial static correlations S (Q), as predicted by the mode coupling theory.
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Affiliation(s)
- F Affouard
- Laboratoire de Dynamique et Structure des Matériaux Moléculaires, CNRS UMR 8024, Université Lille I, Villeneuve d'Ascq, France
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Derollez P, Correia NT, Danède F, Capet F, Affouard F, Lefebvre J, Descamps M. Ab initio structure determination of the high-temperature phase of anhydrous caffeine by X-ray powder diffraction. Acta Crystallogr B 2005; 61:329-34. [PMID: 15914898 DOI: 10.1107/s010876810500546x] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2004] [Accepted: 02/18/2005] [Indexed: 11/10/2022]
Abstract
The high-temperature phase I of anhydrous caffeine was obtained by heating and annealing the purified commercial form II at 450 K. This phase I can be maintained at low temperature in a metastable state. A powder X-ray diffraction pattern was recorded at 278 K with a laboratory diffractometer equipped with an INEL curved position-sensitive detector CPS120. Phase I is dynamically orientationally disordered (the so-called plastic phase). The Rietveld refinements were achieved with rigid-body constraints. It was assumed that on each site, a molecule can adopt three preferential orientations with equal occupation probability. Under a deep undercooling of phase I, below 250 K, the metastable state enters in a glassy crystal state.
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Affiliation(s)
- Patrick Derollez
- Laboratoire de Dynamique et Structure des Matériaux Moléculaires (UMR CNRS 8024), UFR de Physique, Bâtiment P5, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq CEDEX, France.
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Lerbret A, Bordat P, Affouard F, Guinet Y, Hédoux A, Paccou L, Prévost D, Descamps M. Influence of homologous disaccharides on the hydrogen-bond network of water: complementary Raman scattering experiments and molecular dynamics simulations. Carbohydr Res 2005; 340:881-7. [PMID: 15780254 DOI: 10.1016/j.carres.2005.01.036] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2004] [Accepted: 01/28/2005] [Indexed: 10/25/2022]
Abstract
A comparative investigation of trehalose, sucrose, and maltose in water solution has been performed using Raman scattering experiments and Molecular Dynamics simulations. From the analysis of the O-H stretching region in the [2500,4000] cm(-1) Raman spectral range, which includes for the first time the contribution of 'free' water, and the statistical distribution of water HB probabilities from MD simulations, this study confirms the privileged interaction of trehalose with water above a peculiar threshold weight concentration of about 30%. The role of the hydration number of sugars--found higher for trehalose--on the destructuring effect of the water hydrogen bond network is also addressed. The analysis of the water O-H-O bending spectral range [1500,1800] cm(-1) reveals a change of the homogeneity of water molecules influenced by sugars, but the three investigated sugars are found to behave similarly.
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Affiliation(s)
- Adrien Lerbret
- Laboratoire de Dynamique et Structure des Matériaux Moléculaires, CNRS UMR 8024, Université Lille I, 59655 Villeneuve d'Ascq Cedex, France.
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Bordat P, Affouard F, Descamps M, Ngai KL. Does the interaction potential determine both the fragility of a liquid and the vibrational properties of its glassy state? Phys Rev Lett 2004; 93:105502. [PMID: 15447415 DOI: 10.1103/physrevlett.93.105502] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2004] [Indexed: 05/24/2023]
Abstract
By performing molecular dynamics simulations of binary Lennard-Jones systems with three different potentials, we show that the increase of anharmonicity and capacity for intermolecular coupling of the potential is the cause of (i) the increase of kinetic fragility and nonexponentiality in the liquid state, and (ii) the T(g)-scaled temperature dependence of the nonergodicity parameter determined by the vibrations at low temperatures in the glassy state. Naturally, these parameters correlate with each other, as observed experimentally by T. Scopigno et al. [Science 302, 849 (2003)]
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Affiliation(s)
- Patrice Bordat
- Laboratoire de Dynamique et Structure des Matériaux Moléculaires, UMR 8024, Université Lille I, 59655 Villeneuve d'Ascq cedex, France
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Affouard F, Descamps M. Molecular dynamics simulation of norbornene plastic crystal. J Mol Struct 2003. [DOI: 10.1016/s0022-2860(02)00669-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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48
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Affouard F, Descamps M. Is there something of mode coupling theory in orientationally disordered crystals? Phys Rev Lett 2001; 87:035501. [PMID: 11461564 DOI: 10.1103/physrevlett.87.035501] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2000] [Indexed: 05/23/2023]
Abstract
Molecular dynamics simulations have been performed on the orientationally disordered crystal chloroadamantane. We stress that universal behavior, relatively well described by the mode coupling theory, is shared by systems whose dynamics are almost completely controlled by translations or rotations. This investigation also shows the existence of a second remarkable dynamical crossover at the temperature Tx>Tc, consistent with a previous NMR and molecular dynamics study [F. Affouard et al., Europhys. Lett. 53, 611 (2001)]. This allows us to support clearly the existence of a "landscape-influenced" regime as recently proposed [S. Sastry et al., Nature 393, 554 (1998)].
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Affiliation(s)
- F Affouard
- Laboratoire de Dynamique et Structure des Matériaux Moléculaires, CNRS ESA 8024, Université Lille I, 59655 Villeneuve d'Ascq Cedex, France
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Affouard F, Kröger M, Hess S. Molecular dynamics of model liquid crystals composed of semiflexible molecules. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 1996; 54:5178-5186. [PMID: 9965698 DOI: 10.1103/physreve.54.5178] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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