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Ono T, Ito Y, Ota M, Takebayashi Y, Furuya T, Inomata H. Difference in aqueous solution structure at 293.2 and 473.2 K between ethanol and ethylene glycol via molecular dynamics. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Ignatov I, Huether F, Neshev N, Kiselova-Kaneva Y, Popova TP, Bankova R, Valcheva N, Ignatov AI, Angelcheva M, Angushev I, Baiti S. Research of Water Molecules Cluster Structuring during Haberlea rhodopensis Friv. Hydration. PLANTS (BASEL, SWITZERLAND) 2022; 11:2655. [PMID: 36235522 PMCID: PMC9572004 DOI: 10.3390/plants11192655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Accepted: 10/04/2022] [Indexed: 06/16/2023]
Abstract
Gesneriaceae plant family is comprised of resurrection species, namely Boea hygrometrica and Paraboea rufescens, that are native to the Southeast Asia and Haberlea rhodopensis, Ramonda myconi, and Ramonda serbica, which are mainly found in the Balkan Peninsula. Haberlea rhodopensis is known to be able to survive extreme and prolonged dehydration. Study was carried out after the dried plant Haberlea rhodopensis Friv. had been hydrated and had reached its fresh state. Two juice samples were collected from the plant blossom: The first sample was prepared with 1% filtered water through a patented EVOdrop device. Then the sample was saturated with hydrogen with EVOdrop booster to a concentration of 1.2 ppm, pH = 7.3, ORP = -390 mV. This first sample was prepared with filtered tap water from Sofia, Bulgaria. The second sample, which was a control one, was developed with tap water from Sofia, Bulgaria, consisting of 1% solutions of Haberlea rhodopensis. A study revealed that during the drying process in H. rhodopensis the number of free water molecules decreases, and water dimers are formed. The aim of our study was to determine the number of water molecules in clusters in 1% solutions of hydrated H. rhodopensis plants. Results were analyzed according to the two types of water used in the experiment. Th EVOdrop device is equipped with an ultranano membrane and rotating jet nozzle to create a vortex water and saturation thanks to a second device EVObooster to obtain hydrogen-rich water. In the current study Hydrogen-rich water is referred to as Hydrogen EVOdrop Water (HEW). Research was conducted using the following methods-spectral methods non-equilibrium energy spectrum (NES) and differential non-equilibrium energy spectrum (DNES), mathematical models, and study of the distribution of water molecules in water clusters. In a licensed Eurotest Laboratory, the research of tap water before and after flowing through the EVOdrop device was proven. Studies have been carried out on the structuring of water molecule clusters after change of hydrogen bond energies. The restructuring comes with rearrangement of water molecules by the energy levels of hydrogen bonds. Local extrema can be observed in the spectrum with largest amount of water molecules. The structural changes were tested using the NES and DNES spectral methods. The conducted research proved that the application of EVOdrop device and EVObooster changes the parameters of water to benefit hydration and health.
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Affiliation(s)
- Ignat Ignatov
- Scientific Research Center of Medical Biophysics (SRCMB), 1111 Sofia, Bulgaria
| | | | - Nikolai Neshev
- Faculty of Physics, Sofia University “St. Kliment Ohridski”, 1000 Sofia, Bulgaria
| | - Yoana Kiselova-Kaneva
- Department of Biochemistry, Molecular Medicine and Nutrigenomics, Medical University-Varna, 9002 Varna, Bulgaria
| | - Teodora P. Popova
- Faculty of Veterinary Medicine, University of Forestry, 10 Kl. Ohridski Blvd., 1756 Sofia, Bulgaria
| | - Ralitsa Bankova
- Department of Internal Noncommunicable Diseases, Pathology and Pharmacology, Faculty of Veterinary Medicine, University of Forestry, 10 Kl. Ohridski Blvd., 1756 Sofia, Bulgaria
| | - Nedyalka Valcheva
- Faculty of Agriculture, Department Biochemistry, Microbiology, Physics, Trakia University, 6000 Stara Zagora, Bulgaria
| | | | - Mariana Angelcheva
- Department of Kinesitherapy and Rehabilitation, National Sports Academy “B. Levski”, 1700 Sofia, Bulgaria
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Temleitner L, Hattori T, Abe J, Nakajima Y, Pusztai L. Pressure-Dependent Structure of Methanol-Water Mixtures up to 1.2 GPa: Neutron Diffraction Experiments and Molecular Dynamics Simulations. Molecules 2021; 26:molecules26051218. [PMID: 33668744 PMCID: PMC7956270 DOI: 10.3390/molecules26051218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 02/18/2021] [Accepted: 02/22/2021] [Indexed: 11/16/2022] Open
Abstract
Total scattering structure factors of per-deuterated methanol and heavy water, CD3OD and D2O, have been determined across the entire composition range as a function of pressure up to 1.2 GPa, by neutron diffraction. The largest variations due to increasing pressure were observed below a scattering variable value of 5 Å−1, mostly as shifts in terms of the positions of the first and second maxima. Molecular dynamics computer simulations, using combinations of all-atom potentials for methanol and various water force fields, were conducted at the experimental pressures with the aim of interpreting neutron diffraction results. The peak-position shifts mentioned above could be qualitatively reproduced by simulations, although in terms of peak intensities, the accord between neutron diffraction and molecular dynamics was much less satisfactory. However, bearing in mind that increasing pressure must have a profound effect on repulsive forces between neighboring molecules, the agreement between experiment and computer simulation can certainly be termed as satisfactory. In order to reveal the influence of changing pressure on local intermolecular structure in these “simplest of complex” hydrogen-bonded liquid mixtures, simulated structures were analyzed in terms of hydrogen bond-related partial radial distribution functions and size distributions of hydrogen-bonded cyclic entities. Distinct differences between pressure-dependent structures of water-rich and methanol-rich composition regions were revealed.
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Affiliation(s)
- László Temleitner
- Wigner Research Centre for Physics, Konkoly Thege út 29-33, H-1121 Budapest, Hungary;
| | - Takanori Hattori
- J-PARC Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan;
| | - Jun Abe
- Neutron Science and Technology Center CROSS, 162-1, Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1106, Japan;
| | - Yoichi Nakajima
- Department of Physics, Kumamoto University, Kurokami 2-39-1, Kumamoto 860-8555, Japan;
| | - László Pusztai
- Wigner Research Centre for Physics, Konkoly Thege út 29-33, H-1121 Budapest, Hungary;
- International Research Organization for Advanced Science and Technology (IROAST), Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan
- Correspondence:
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Dwivedi S, Mata J, Mushrif SH, Chaffee AL, Tanksale A. Molecular Clustering in Formaldehyde-Methanol-Water Mixtures Revealed by High-Intensity, High-q Small-Angle Neutron Scattering. J Phys Chem Lett 2021; 12:480-486. [PMID: 33373259 DOI: 10.1021/acs.jpclett.0c03515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Methanol-Water (mw) mixtures, with or without a solute, display a nonideal thermodynamic behavior, typically attributed to the structure of the microphase. However, experimental observation of the microphase structures at the molecular length scale has been a challenge. We report the presence of molecular clusters in mw and formaldehyde-methanol-water (fmw) mixtures using small-angle neutron scattering (SANS) experiments and molecular dynamics (MD) simulations. Hydrophobic clusters of methanol in mw and formaldehyde-methanol in fmw mixtures were observed at low methanol compositions (xm ≤ 0.3). A three-dimensional hydrogen-bonded network of water with the solute is observed at xm = 0.5. Linear chains of methanol surrounding the formaldehyde and water molecules were observed at high methanol compositions (xm ≥ 0.7). The calculated size of the molecular clusters (r ≈ 0.5 nm, spherical) from the SANS data and their volume fraction closely matched the MD simulation results.
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Affiliation(s)
- Swarit Dwivedi
- Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia
| | - Jitendra Mata
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234, Australia
| | - Samir H Mushrif
- Department of Chemical and Materials Engineering, University of Alberta, 9211-116 Street, Edmonton, Alberta T6G 1H9, Canada
| | - Alan L Chaffee
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Akshat Tanksale
- Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia
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