1
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Hervø-Hansen S, Polák J, Tomandlová M, Dzubiella J, Heyda J, Lund M. Salt Effects on Caffeine across Concentration Regimes. J Phys Chem B 2023; 127:10253-10265. [PMID: 38058160 DOI: 10.1021/acs.jpcb.3c01085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/08/2023]
Abstract
Salts affect the solvation thermodynamics of molecules of all sizes; the Hofmeister series is a prime example in which different ions lead to salting-in or salting-out of aqueous proteins. Early work of Tanford led to the discovery that the solvation of molecular surface motifs is proportional to the solvent accessible surface area (SASA), and later studies have shown that the proportionality constant varies with the salt concentration and type. Using multiscale computer simulations combined with vapor-pressure osmometry on caffeine-salt solutions, we reveal that this SASA description captures a rich set of molecular driving forces in tertiary solutions at changing solute and osmolyte concentrations. Central to the theoretical work is a new potential energy function that depends on the instantaneous surface area, salt type, and concentration. Used in, e.g., Monte Carlo simulations, this allows for a highly efficient exploration of many-body interactions and the resulting thermodynamics at elevated solute and salt concentrations.
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Affiliation(s)
- Stefan Hervø-Hansen
- Division of Computational Chemistry, Department of Chemistry, Lund University, Lund SE 221 00, Sweden
- Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Jakub Polák
- Department of Physical Chemistry, University of Chemistry and Technology, Technická 5, Praha 6, Prague CZ-16628, Czech Republic
| | - Markéta Tomandlová
- Department of Physical Chemistry, University of Chemistry and Technology, Technická 5, Praha 6, Prague CZ-16628, Czech Republic
| | - Joachim Dzubiella
- Physikalisches Institut, Albert-Ludwigs Universität Freiburg, Hermann-Herder-Straße 3, Freiburg Im Breisgau D-79104, Germany
| | - Jan Heyda
- Department of Physical Chemistry, University of Chemistry and Technology, Technická 5, Praha 6, Prague CZ-16628, Czech Republic
| | - Mikael Lund
- Division of Computational Chemistry, Department of Chemistry, Lund University, Lund SE 221 00, Sweden
- Lund Institute of Advance Neutron and X-ray Science (LINXS), Lund SE 223 70, Sweden
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2
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Shen Y, Xiao Y, Edkins RM, Youngs TGA, Hughes TL, Tellam J, Edkins K. Elucidating the hydrotropism behaviour of aqueous caffeine and sodium benzoate solution through NMR and neutron total scattering analysis. Int J Pharm 2023; 647:123520. [PMID: 37858637 DOI: 10.1016/j.ijpharm.2023.123520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 10/13/2023] [Accepted: 10/16/2023] [Indexed: 10/21/2023]
Abstract
Hydrotropism is a convenient way to increase the solubility of drugs by up to several orders of magnitude, and even though it has been researched for decades with both experimental and simulation methods, its mechanism is still unknown. Here, we use caffeine/sodium benzoate (CAF-SB) as model system to explore the behaviour of caffeine solubility enhancement in water through NMR spectroscopy and neutron total scattering. 1H NMR shows strong interaction between caffeine and sodium benzoate in water. Neutron total scattering combined with empirical potential structure refinement, a systematic method to study the solution structure, reveals π-stacking between caffeine and the benzoate anion as well as Coulombic interactions with the sodium cation. The strongest hydrogen bond interaction in the system is between benzoate and water, which help dissolve CAF-SB complex and increase the solubility of CAF in water. Besides, the stronger interaction between CAF and water and the distortion of water structure are further mechanisms of the CAF solubility enhancement. It is likely that the variety of mechanisms for hydrotropism shown in this system can be found for other hydrotropes, and NMR spectroscopy and neutron total scattering can be used as complementary techniques to generate a holistic picture of hydrotropic solutions.
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Affiliation(s)
- Yichun Shen
- School of Health Sciences, University of Manchester, Stopford Building, Oxford Road, Manchester M13 9PT, UK
| | - Yitian Xiao
- School of Health Sciences, University of Manchester, Stopford Building, Oxford Road, Manchester M13 9PT, UK
| | - Robert M Edkins
- Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295, Cathedral Street, Glasgow, G1 1XL, UK
| | - Tristan G A Youngs
- ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Oxford, Didcot, OX11 0QX, UK
| | - Terri-Louise Hughes
- ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Oxford, Didcot, OX11 0QX, UK
| | - James Tellam
- ISIS Deuteration Facility, STFC Rutherford Appleton Laboratory, Harwell Oxford, Didcot, OX11 0QX, UK
| | - Katharina Edkins
- School of Health Sciences, University of Manchester, Stopford Building, Oxford Road, Manchester M13 9PT, UK.
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3
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Shen Y, Cruz-Cabeza AJ, Azzouz O, Edkins K. Using Prenucleation Aggregation of Caffeine-Benzoic Acid as a Rapid Indication of Co-crystallization from Solutions. Mol Pharm 2023; 20:1942-1950. [PMID: 36942815 DOI: 10.1021/acs.molpharmaceut.2c00829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
Abstract
Co-crystal design is a convenient way to remedy the poor biopharmaceutical properties of drugs. Most studies focus on experimental co-crystal screening or computational prediction, but hardly any work has been done toward fast, efficient, and reliable prediction of solution crystallization for co-crystal formation. Here, we study the caffeine-benzoic acid co-crystal system, due to its reported difficulty to crystallize from the solution phase. With this work, we investigate whether there is a link between prenucleation aggregation in solution and co-crystal formation and how to harness this for crystallization prediction. 1H and 13C NMR spectroscopy is used to study the prenucleation interaction between caffeine and benzoic acid in methanol, acetone, and acetonitrile as examples of common solvents. In this system, crystallization from methanol leads to no co-crystallization, from acetone to concomitant crystallization of co-crystal and caffeine, and from acetonitrile to pure co-crystal formation from solution. Strong heteromeric dimers were found to exist in all three solvents. Ternary phase diagrams were defined and a solution-accessible co-crystal region was found for all solvents. For this system, the prenucleation clusters found in solution could be linked to the crystallization of the co-crystal. Crystallization from DMSO did not yield the co-crystal and there were no detectable prenucleation aggregates. NMR spectroscopy to probe dimers in solution can thus be used as a fast, reliable, and promising tool to predict co-crystallization from specific solvents and to screen for suitable solvents for manufacturing and scale-up.
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Affiliation(s)
- Yichun Shen
- School of Health Sciences, University of Manchester, Manchester M13 9PT, U.K
| | | | - Ossama Azzouz
- School of Health Sciences, University of Manchester, Manchester M13 9PT, U.K
| | - Katharina Edkins
- School of Health Sciences, University of Manchester, Manchester M13 9PT, U.K
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4
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Hervø-Hansen S, Heyda J, Lund M, Matubayasi N. Anion-cation contrast of small molecule solvation in salt solutions. Phys Chem Chem Phys 2022; 24:3238-3249. [PMID: 35044392 PMCID: PMC8809138 DOI: 10.1039/d1cp04129k] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Accepted: 12/24/2021] [Indexed: 11/21/2022]
Abstract
The contributions from anions and cations from salt are inseparable in their perturbation of molecular systems by experimental and computational methods, rendering it difficult to dissect the effects exerted by the anions and cations individually. Here we investigate the solvation of a small molecule, caffeine, and its perturbation by monovalent salts from various parts of the Hofmeister series. Using molecular dynamics and the energy-representation theory of solvation, we estimate the solvation free energy of caffeine and decompose it into the contributions from anions, cations, and water. We also decompose the contributions arising from the solute-solvent and solute-ions interactions and that from excluded volume, enabling us to pin-point the mechanism of salt. Anions and cations revealed high contrast in their perturbation of caffeine solvation, with the cations salting-in caffeine via binding to the polar ketone groups, while the anions were found to be salting-out via perturbations of water. In agreement with previous findings, the perturbation by salt is mostly anion dependent, with the magnitude of the excluded-volume effect found to be the governing mechanism. The free-energy decomposition as conducted in the present work can be useful to understand ion-specific effects and the associated Hofmeister series.
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Affiliation(s)
- Stefan Hervø-Hansen
- Division of Theoretical Chemistry, Department of Chemistry, Lund University, Lund SE 221 00, Sweden.
| | - Jan Heyda
- Department of Physical Chemistry, University of Chemistry and Technology, Prague CZ-16628, Czech Republic.
| | - Mikael Lund
- Division of Theoretical Chemistry, Department of Chemistry, Lund University, Lund SE 221 00, Sweden.
- Lund Institute for Advanced Neutron and X-ray Science (LINXS), Lund University, Lund, Sweden
| | - Nobuyuki Matubayasi
- Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.
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5
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Abstract
Caffeine is not only a widely consumed active stimulant, but it is also a model molecule commonly used in pharmaceutical sciences. In this work, by performing quartz-crystal microbalance and neutron reflectometry experiments we investigate the interaction of caffeine molecules with a model lipid membrane. We determined that caffeine molecules are not able to spontaneously partition from an aqueous environment, enriched in caffeine, into a bilayer. Caffeine could be however included in solid-supported lipid bilayers if present with lipids during self-assembly. In this case, thanks to surface-sensitive techniques, we determined that caffeine molecules are preferentially located in the hydrophobic region of the membrane. These results are highly relevant for the development of new drug delivery vectors, as well as for a deeper understanding of the membrane permeation role of purine molecules.
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Affiliation(s)
- Letizia Tavagnacco
- CNR-ISC and Department of Physics, Sapienza University of Rome, Piazzale A. Moro 2, 00185 Rome, Italy
| | - Giacomo Corucci
- Institut Laue-Langevin, 71 avenue des Martyrs, 38000 Grenoble, France
| | - Yuri Gerelli
- Department of Life and Environmental Sciences, Marche Polytechnic University, Via Brecce Bianche, 60121 Ancona, Italy
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6
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Di Gioacchino M, Bruni F, Imberti S, Ricci MA. Hydration of Carboxyl Groups: A Route toward Molecular Recognition? J Phys Chem B 2020; 124:4358-4364. [PMID: 32352785 PMCID: PMC8007097 DOI: 10.1021/acs.jpcb.0c03609] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
On Earth, water plays
an active role in cellular life, over several
scales of distance and time. At a nanoscale, water drives macromolecular
conformation through hydrophobic forces and at short times acts as
a proton donor/acceptor providing charge carriers for signal transmission.
At longer times and larger distances, water controls osmosis, transport,
and protein mobility. Neutron diffraction experiments augmented by
computer simulation, show that the three-dimensional shape of the
hydration shell of carboxyl and carboxylate groups belonging to different
molecules is characteristic of each molecule. Different hydration
shells identify and distinguish specific sites with the same chemical
structure. This experimental evidence suggests an active role of water
also in controlling, modulating, and mediating chemical reactions
involving carboxyl and carboxylate groups.
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Affiliation(s)
- Michael Di Gioacchino
- Dipartimento di Scienze, Universitá degli Studi Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy
| | - Fabio Bruni
- Dipartimento di Scienze, Universitá degli Studi Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy
| | - Silvia Imberti
- UKRI-STFC, ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Harwell Campus, Chilton, Didcot OX11 0QX, U.K
| | - Maria Antonietta Ricci
- Dipartimento di Scienze, Universitá degli Studi Roma Tre, via della Vasca Navale 84, 00146 Roma, Italy
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7
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Di Fonzo S, Amato J, D'Aria F, Caterino M, D'Amico F, Gessini A, Brady JW, Cesàro A, Pagano B, Giancola C. Ligand binding to G-quadruplex DNA: new insights from ultraviolet resonance Raman spectroscopy. Phys Chem Chem Phys 2020; 22:8128-8140. [PMID: 32246758 DOI: 10.1039/d0cp01022g] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
G-Quadruplexes (G4s) are noncanonical nucleic acid structures involved in the regulation of several biological processes of many organisms. The rational design of G4-targeting molecules developed as potential anticancer and antiviral therapeutics is a complex problem intrinsically due to the structural polymorphism of these peculiar DNA structures. The aim of the present work is to show how Ultraviolet Resonance Raman (UVRR) spectroscopy can complement other techniques in providing valuable information about ligand/G4 interactions in solution. Here, the binding of BRACO-19 and Pyridostatin - two of the most potent ligands - to selected biologically relevant G4s was investigated by polarized UVRR scattering at 266 nm. The results give new insights into the binding mode of these ligands to G4s having different sequences and topologies by performing an accurate analysis of peaks assigned to specific groups and their changes upon binding. Indeed, the UVRR data not only show that BRACO-19 and Pyridostatin interact with different G4 sites, but also shed light on the ligand and G4 chemical groups really involved in the interaction. In addition, UVRR results complemented by circular dichroism data clearly indicate that the binding mode of a ligand can also depend on the conformation(s) of the target G4. Overall, these findings demonstrate the utility of using UVRR spectroscopy in the investigation of G4s and G4-ligand interactions in solution.
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Affiliation(s)
- Silvia Di Fonzo
- Elettra-Sincrotrone Trieste S. C. p. A., Science Park, Trieste, I-34149, Italy.
| | - Jussara Amato
- Department of Pharmacy, University of Naples Federico II, Naples, I-80131, Italy.
| | - Federica D'Aria
- Department of Pharmacy, University of Naples Federico II, Naples, I-80131, Italy.
| | - Marco Caterino
- Department of Pharmacy, University of Naples Federico II, Naples, I-80131, Italy.
| | - Francesco D'Amico
- Elettra-Sincrotrone Trieste S. C. p. A., Science Park, Trieste, I-34149, Italy.
| | - Alessandro Gessini
- Elettra-Sincrotrone Trieste S. C. p. A., Science Park, Trieste, I-34149, Italy.
| | - John W Brady
- Department of Food Science, Cornell University, Ithaca, New York, NY 14853, USA
| | - Attilio Cesàro
- Elettra-Sincrotrone Trieste S. C. p. A., Science Park, Trieste, I-34149, Italy. and Department of Chemical and Pharmaceutical Sciences, University of Trieste, Trieste, I-34127, Italy
| | - Bruno Pagano
- Department of Pharmacy, University of Naples Federico II, Naples, I-80131, Italy.
| | - Concetta Giancola
- Department of Pharmacy, University of Naples Federico II, Naples, I-80131, Italy.
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8
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Imberti S, McLain SE, Rhys NH, Bruni F, Ricci MA. Role of Water in Sucrose, Lactose, and Sucralose Taste: The Sweeter, The Wetter? ACS OMEGA 2019; 4:22392-22398. [PMID: 31909321 PMCID: PMC6941182 DOI: 10.1021/acsomega.9b02794] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Accepted: 11/15/2019] [Indexed: 05/16/2023]
Abstract
Natural sugars combine energy supply and, except a few cases, a pleasant taste. On the other hand, exaggerated consumption may impact population health. This has busted the research for the synthesis of increasingly cheaper artificial sweeteners, with low energy content and intense taste. Here, we suggest that studies of the hydration properties of three disaccharides, namely, the natural sucrose and lactose and the artificial sucralose, may explain the difference by orders of magnitude among their sweetness. This is done by analyzing via Monte Carlo simulations the neutron diffraction differential cross sections of aqueous solutions of the three sugars and their isotopes. Our results show that the strength of the sugar-water hydrogen bond interaction is one of the factors influencing sweetness, another being the number of water molecules within the first neighboring shell of the sugar whether bonded or not.
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Affiliation(s)
- Silvia Imberti
- UKRI-STFC,
ISIS Neutron and Muon Source, Rutherford
Appleton Laboratory, Harwell Campus, OX11 0QX Didcot, United Kingdom
- E-mail: ,
| | - Sylvia E. McLain
- Department
of Chemistry, School of Life Sciences, University
of Sussex, Falmer, BN1 9RH Brighton, United Kingdom
| | - Natasha H. Rhys
- Department
of Physics, King’s College London, WC2R 2LS London, United Kingdom
| | - Fabio Bruni
- Dipartimento
di Scienze, Sezione di Nanoscienze, Università
degli Studi “Roma Tre”, Via della Vasca Navale 84, 00146 Roma, Italy
| | - Maria Antonietta Ricci
- Dipartimento
di Scienze, Sezione di Nanoscienze, Università
degli Studi “Roma Tre”, Via della Vasca Navale 84, 00146 Roma, Italy
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9
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Reddy V, Saharay M. Solubility of Caffeine in Supercritical CO 2: A Molecular Dynamics Simulation Study. J Phys Chem B 2019; 123:9685-9691. [PMID: 31617358 DOI: 10.1021/acs.jpcb.9b08351] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The extraction of caffeine from green tea leaves and cocoa beans is a common industrial process for the production of decaffeinated beverages and pharmaceuticals. The choice of the solvent critically determines the yield of this extraction process. Being an environmentally benign and recyclable solvent, supercritical carbon dioxide (scCO2) has emerged as the most desirable green solvent for caffeine extraction. The present study investigates the solvation properties of caffeine in scCO2 at two different temperatures (318 and 350 K) using molecular dynamics simulations. Unlike in water, the caffeine molecules in scCO2 do not aggregate to form clusters due to relatively stronger caffeine-CO2 interactions. A well-structured scCO2 solvent shell envelops each caffeine molecule as a result of strong electron-donor-acceptor (EDA) and hydrogen-bonding interactions between these two species. Upon heating, although marginal site-specific changes in the distribution of nearest CO2 around caffeine are observed, the overall distribution is retained. At a higher temperature, the caffeine-CO2 hydrogen-bonding interactions are weakened, while their EDA interactions become relatively stronger. The results underscore the importance of the interplay of these interactions in determining stable solvent structures and solubility of caffeine in scCO2.
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Affiliation(s)
- Vishwanath Reddy
- Department of Physics, University College of Science , Osmania University , Hyderabad 500007 , Telangana , India
| | - Moumita Saharay
- Department of Physics, University College of Science , Osmania University , Hyderabad 500007 , Telangana , India
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10
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11
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Gurina DL, Golubev VA. Features of Structural Solvation of Methylxanthines in Carbon Tetrachloride–Methanol Binary Mixtures: Molecular Dynamics Simulation. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2019. [DOI: 10.1134/s0036024419010102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Jones CD, Walker M, Xiao Y, Edkins K. Pre-nucleation aggregation based on solvent microheterogeneity. Chem Commun (Camb) 2019; 55:4865-4868. [DOI: 10.1039/c9cc01455a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The microheterogeneous region of aqueous acetonitrile leads to preferred localisation and aggregation of caffeine and theophylline on the interface.
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Affiliation(s)
| | - Martin Walker
- Department of Chemistry
- Durham University
- Durham DH1 3LE
- UK
| | - Yitian Xiao
- School of Pharmacy
- Queen's University Belfast
- Belfast BT9 7BL
- UK
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13
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Basma NS, Headen TF, Shaffer MSP, Skipper NT, Howard CA. Local Structure and Polar Order in Liquid N-Methyl-2-pyrrolidone (NMP). J Phys Chem B 2018; 122:8963-8971. [DOI: 10.1021/acs.jpcb.8b08020] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Nadir S. Basma
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, U.K
- Department of Physics and Astronomy, University College London, London WC1E 6BT, U.K
| | - Thomas F. Headen
- ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Harwell Campus, Didcot OX11 0QX, Oxfordshire, U.K
| | - Milo S. P. Shaffer
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, U.K
| | - Neal T. Skipper
- Department of Physics and Astronomy, University College London, London WC1E 6BT, U.K
| | - Christopher A. Howard
- Department of Physics and Astronomy, University College London, London WC1E 6BT, U.K
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14
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Bruni F, Di Mino C, Imberti S, McLain SE, Rhys NH, Ricci MA. Hydrogen Bond Length as a Key To Understanding Sweetness. J Phys Chem Lett 2018; 9:3667-3672. [PMID: 29920095 DOI: 10.1021/acs.jpclett.8b01280] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Neutron diffraction experiments have been performed to investigate and compare the structure of the hydration shell of three monosaccharides, namely, fructose, glucose, and mannose. It is found that despite their differences with respect to many thermodynamical quantities, bioprotective properties against environmental stresses, and taste, the influence of these monosaccharides on the bulk water solvent structure is virtually identical. Conversely, these sugars interact with the neighboring water molecules by forming H bonds of different length and strength. Interestingly, the sweetness of these monosaccharides, along with that of the disaccharide trehalose, is correlated with the length of these H bonds. This suggests that the small differences in stereochemistry between the different sugars determine a relevant change in polarity, which has a fundamental impact on the behavior of these molecules in vivo.
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Affiliation(s)
- F Bruni
- Dipartimento di Scienze, Sezione di Nanoscienze , Università degli Studi "Roma Tre" , Via della Vasca Navale 84 , 00146 Roma , Italy
| | - C Di Mino
- Dipartimento di Scienze, Sezione di Nanoscienze , Università degli Studi "Roma Tre" , Via della Vasca Navale 84 , 00146 Roma , Italy
| | - S Imberti
- ISIS Neutron and Muon Source, STFC, Rutherford Appleton Laboratory , Harwell Campus , Didcot , Oxfordshire OX11 0QX , United Kingdom
| | - S E McLain
- Department of Biochemistry , University of Oxford , South Park Road , Oxford , Oxfordshire OX1 3QU , United Kingdom
| | - N H Rhys
- Department of Biochemistry , University of Oxford , South Park Road , Oxford , Oxfordshire OX1 3QU , United Kingdom
| | - M A Ricci
- Dipartimento di Scienze, Sezione di Nanoscienze , Università degli Studi "Roma Tre" , Via della Vasca Navale 84 , 00146 Roma , Italy
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15
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Tavagnacco L, Mason PE, Neilson GW, Saboungi ML, Cesàro A, Brady JW. Molecular Dynamics and Neutron Scattering Studies of Mixed Solutions of Caffeine and Pyridine in Water. J Phys Chem B 2018; 122:5308-5315. [PMID: 29092394 DOI: 10.1021/acs.jpcb.7b07798] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Insight into the molecular interactions of homotactic and heterotactic association of caffeine and pyridine in aqueous solution is given on the basis of both experimental and simulation studies. Caffeine is about 5 times more soluble in a 3 m aqueous pyridine solution than it is in pure water (an increase from ∼0.1 m to 0.5 m). At this elevated concentration the system becomes suitable for neutron scattering study. Caffeine-pyridine interactions were studied by neutron scattering and molecular dynamics simulations, allowing a detailed characterization of the spatial and orientational structure of the solution. It was found that while pyridine-caffeine interactions are not as strong as caffeine-caffeine interactions, the pyridine-caffeine interactions still significantly disrupted caffeine-caffeine stacking. The alteration of the caffeine-caffeine stacking, occasioned by the presence of pyridine molecules in solution and the consequent formation of heterotactic interactions, leads to the experimentally detected increase in caffeine solubility.
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Affiliation(s)
- Letizia Tavagnacco
- Department of Food Science , Cornell University , Ithaca , New York 14853 , United States.,Department of Chemical and Pharmaceutical Sciences , University of Trieste , Via Giorgieri 1 , I-34127 Trieste , Italy
| | - Philip E Mason
- Institute of Organic Chemistry and Biochemistry , Academy of Sciences of the Czech Republic and Center for Biomolecules and Complex Molecular Systems , 16610 Prague 6 , Czech Republic
| | - George W Neilson
- H. H. Wills Physics Laboratory , University of Bristol , Bristol BS8 1TL , United Kingdom
| | - Marie-Louise Saboungi
- IMPMC-Université Pierre et Marie Curie and CNRS , 4 Place Jussieu , F-75252 Paris , France.,Functional Nano & Soft Materials Laboratory (FUNSOM) , Soochow University , Suzhou 215123 , China
| | - Attilio Cesàro
- Department of Chemical and Pharmaceutical Sciences , University of Trieste , Via Giorgieri 1 , I-34127 Trieste , Italy.,Elettra-Sincrotrone Trieste S.C.p.A ., Strada Statale 14 Km 163.5, Area Science Park , I-34149 Trieste , Italy
| | - John W Brady
- Department of Food Science , Cornell University , Ithaca , New York 14853 , United States
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16
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Rhys NH, Bruni F, Imberti S, McLain SE, Ricci MA. Glucose and Mannose: A Link between Hydration and Sweetness. J Phys Chem B 2017; 121:7771-7776. [DOI: 10.1021/acs.jpcb.7b03919] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- N. H. Rhys
- Department
of Biochemistry, University of Oxford, South Park Road, Oxford, Oxfordshire OX1 3QU, United Kingdom
| | - F. Bruni
- Dipartimento
di Scienze, Sezione di Nanoscienze, Università degli Studi “Roma Tre”, Via della Vasca Navale 84, 00146 Roma, Italy
| | - S. Imberti
- ISIS
Neutron and Muon source, STFC, Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - S. E. McLain
- Department
of Biochemistry, University of Oxford, South Park Road, Oxford, Oxfordshire OX1 3QU, United Kingdom
| | - M. A. Ricci
- Dipartimento
di Scienze, Sezione di Nanoscienze, Università degli Studi “Roma Tre”, Via della Vasca Navale 84, 00146 Roma, Italy
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17
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Duboué-Dijon E, Mason PE, Fischer HE, Jungwirth P. Changes in the hydration structure of imidazole upon protonation: Neutron scattering and molecular simulations. J Chem Phys 2017. [DOI: 10.1063/1.4982937] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Affiliation(s)
- Elise Duboué-Dijon
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nam. 2, 16610 Prague 6, Czech Republic
| | - Philip E. Mason
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nam. 2, 16610 Prague 6, Czech Republic
| | - Henry E. Fischer
- Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France
| | - Pavel Jungwirth
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nam. 2, 16610 Prague 6, Czech Republic
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18
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Steinke N, Genina A, Lorenz CD, McLain SE. Salt Interactions in Solution Prevent Direct Association of Urea with a Peptide Backbone. J Phys Chem B 2017; 121:1866-1876. [DOI: 10.1021/acs.jpcb.6b12542] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nicola Steinke
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, U.K
| | - Anna Genina
- Department of Physics, King’s College London, London SE1 9NH, U.K
| | | | - Sylvia E. McLain
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, U.K
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19
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Johnson NO, Light TP, MacDonald G, Zhang Y. Anion–Caffeine Interactions Studied by 13C and 1H NMR and ATR–FTIR Spectroscopy. J Phys Chem B 2017; 121:1649-1659. [DOI: 10.1021/acs.jpcb.6b12150] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Nicolas O. Johnson
- Department of Chemistry and
Biochemistry, James Madison University, Harrisonburg, Virginia 22807, United States
| | - Taylor P. Light
- Department of Chemistry and
Biochemistry, James Madison University, Harrisonburg, Virginia 22807, United States
| | - Gina MacDonald
- Department of Chemistry and
Biochemistry, James Madison University, Harrisonburg, Virginia 22807, United States
| | - Yanjie Zhang
- Department of Chemistry and
Biochemistry, James Madison University, Harrisonburg, Virginia 22807, United States
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20
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Rogers BA, Thompson TS, Zhang Y. Hofmeister Anion Effects on Thermodynamics of Caffeine Partitioning between Aqueous and Cyclohexane Phases. J Phys Chem B 2016; 120:12596-12603. [DOI: 10.1021/acs.jpcb.6b07760] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Bradley A. Rogers
- Department of Chemistry and
Biochemistry, James Madison University, Harrisonburg, Virginia 22807, United States
| | - Tye S. Thompson
- Department of Chemistry and
Biochemistry, James Madison University, Harrisonburg, Virginia 22807, United States
| | - Yanjie Zhang
- Department of Chemistry and
Biochemistry, James Madison University, Harrisonburg, Virginia 22807, United States
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21
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Tavagnacco L, Gerelli Y, Cesàro A, Brady JW. Stacking and Branching in Self-Aggregation of Caffeine in Aqueous Solution: From the Supramolecular to Atomic Scale Clustering. J Phys Chem B 2016; 120:9987-96. [PMID: 27579545 DOI: 10.1021/acs.jpcb.6b06980] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The dynamical and structural properties of caffeine solutions at the solubility limit have been investigated as a function of temperature by means of MD simulations, static and dynamic light scattering, and small angle neutron scattering experiments. A clear picture unambiguously supported by both experiment and simulation emerges: caffeine self-aggregation promotes the formation of two distinct types of clusters: linear aggregates of stacked molecules, formed by 2-14 caffeine molecules depending on the thermodynamic conditions and disordered branched aggregates with a size in the range 1000-3000 Å. While the first type of association is well-known to occur under room temperature conditions for both caffeine and other purine systems, such as nucleotides, the presence of the supramolecular aggregates has not been reported previously. MD simulations indicate that branched structures are formed by caffeine molecules in a T-shaped arrangement. An increase of the solubility limit (higher temperature but also higher concentration) broadens the distribution of cluster sizes, promoting the formation of stacked aggregates composed by a larger number of caffeine molecules. Surprisingly, the effect on the branched aggregates is rather limited. Their internal structure and size do not change considerably in the range of solubility limits investigated.
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Affiliation(s)
- Letizia Tavagnacco
- Department of Food Science, Stocking Hall, Cornell University , Ithaca, New York 14853, United States.,Elettra-Sincrotrone Trieste S.C.p.A. , Strada Statale 14 Km 163.5, Area Science Park, I-34149 Trieste, Italy
| | - Yuri Gerelli
- Institut Laue-Langevin , 71, avenue des Martyrs, 38000 Grenoble, France
| | - Attilio Cesàro
- Elettra-Sincrotrone Trieste S.C.p.A. , Strada Statale 14 Km 163.5, Area Science Park, I-34149 Trieste, Italy.,Department of Chemical and Pharmaceutical Sciences, University of Trieste , Via Giorgieri 1, I-34127 Trieste, Italy
| | - John W Brady
- Department of Food Science, Stocking Hall, Cornell University , Ithaca, New York 14853, United States
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22
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Steinke N, Gillams RJ, Pardo LC, Lorenz CD, McLain SE. Atomic scale insights into urea–peptide interactions in solution. Phys Chem Chem Phys 2016; 18:3862-70. [DOI: 10.1039/c5cp06646h] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Investigations on the β-turn forming peptide, GPG, suggest that urea denatures proteins by replacing water molecules and subsequently weakening the peptide bonds as a possible mechanism of protein denaturation by urea.
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Affiliation(s)
- Nicola Steinke
- Department of Biochemistry
- University of Oxford
- Oxford OX1 3QU
- UK
| | | | - Luis Carlos Pardo
- Departament de Física i Enginyeria Nuclear
- Escola Tècnica Superior d'Enginyeria Industrial de Barcelona (ETSEIB)
- Universitat Politècnica de Catalunya
- 08028 Barcelona
- Catalonia, Spain
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23
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Sridhar A, Johnston AJ, Varathan L, McLain SE, Biggin PC. The solvation structure of alprazolam. Phys Chem Chem Phys 2016; 18:22416-25. [DOI: 10.1039/c6cp02645a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Alprazolam is a benzodiazepine that is commonly prescribed for the treatment of anxiety and other related disorders.
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24
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Tavagnacco L, Di Fonzo S, D’Amico F, Masciovecchio C, Brady JW, Cesàro A. Stacking of purines in water: the role of dipolar interactions in caffeine. Phys Chem Chem Phys 2016; 18:13478-86. [DOI: 10.1039/c5cp07326j] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Concentration dependence of the NCE and the dephasing time show that caffeine molecules aggregate at 80 °C by planar stacking with a relevant contribution of dipole interactions.
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Affiliation(s)
- L. Tavagnacco
- Elettra-Sincrotrone Trieste S.C.p.A
- I-34149 Trieste
- Italy
- Lab. of Physical and Macromolecular Chemistry
- Department of Chemical and Pharmaceutical Sciences
| | - S. Di Fonzo
- Elettra-Sincrotrone Trieste S.C.p.A
- I-34149 Trieste
- Italy
| | - F. D’Amico
- Elettra-Sincrotrone Trieste S.C.p.A
- I-34149 Trieste
- Italy
| | | | - J. W. Brady
- Department of Food Science
- Stocking Hall
- Cornell University
- Ithaca
- USA
| | - A. Cesàro
- Elettra-Sincrotrone Trieste S.C.p.A
- I-34149 Trieste
- Italy
- Lab. of Physical and Macromolecular Chemistry
- Department of Chemical and Pharmaceutical Sciences
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