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Marczak W. Is Passynski's Approach to Hydration Numbers Consistent with Thermodynamics? Molecules 2024; 29:4214. [PMID: 39275062 PMCID: PMC11397611 DOI: 10.3390/molecules29174214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2024] [Revised: 08/30/2024] [Accepted: 09/01/2024] [Indexed: 09/16/2024] Open
Abstract
Hydrophilic and hydrophobic phenomena occur in aqueous solutions. Despite the complex nature of the molecular interactions, the propensity of molecules and ions to hydration is sometimes characterized by a single "hydration number". Passynski's method for determining the hydration numbers in dilute aqueous solutions belongs to the group of methods based on the analysis of the isentropic compressibility of a mixture. Isentropic compressibility is a thermodynamic material constant; thus, the paper deals with Passynski's approach discussed in terms of thermodynamics. First, Passynski's assumptions were applied to the volume of the mixture. Subsequent strict thermodynamic derivation led to a formula for the hydration number which resembled that of Onori rather than the original one. Passynski's number turned out to be inconsistent with the thermodynamics and mechanics of fluids. This is a rather purely empirical measure of the slope of the dependence of isentropic compressibility on the solute mole fraction in a dilute aqueous solution. Being the quotient of the slope and the isentropic compressibility of pure water, Pasynski's numbers are more convenient to analyze and discuss than the slopes themselves. Conclusions about molecular interactions based on these numbers must be treated with considerable caution.
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Affiliation(s)
- Wojciech Marczak
- Faculty of Science and Technology, Jan Dlugosz University, Al. Armii Krajowej 13/15, 42-200 Częstochowa, Poland
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Nizomov Z, Asozoda M, Nematov D. Characteristics of Nanoparticles in Aqueous Solutions of Acetates and Sulfates of Single and Doubly Charged Cations. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2022. [DOI: 10.1007/s13369-022-07128-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Zetterholm SG, Verville GA, Boutwell L, Boland C, Prather JC, Bethea J, Cauley J, Warren KE, Smith SA, Magers DH, Hammer NI. Noncovalent Interactions between Trimethylamine N-Oxide (TMAO), Urea, and Water. J Phys Chem B 2018; 122:8805-8811. [PMID: 30165021 DOI: 10.1021/acs.jpcb.8b04388] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Trimethylamine N-oxide (TMAO) and urea are two important osmolytes with their main significance to the biophysical field being in how they uniquely interact with proteins. Urea is a strong protein destabilizing agent, whereas TMAO is known to counteract urea's deleterious effects. The exact mechanisms by which TMAO stabilizes and urea destabilizes folded proteins continue to be debated in the literature. Although recent evidence has suggested that urea binds directly to amino acid side chains to make protein folding less thermodynamically favored, it has also been suggested that urea acts indirectly to denature proteins by destabilizing the surrounding hydrogen bonding water networks. Here, we elucidate the molecular level mechanism of TMAO's unique ability to counteract urea's destabilizing nature by comparing Raman spectroscopic frequency shifts to the results of electronic structure calculations of microsolvated molecular clusters. Experimental and computational data suggest that the addition of TMAO into an aqueous solution of urea induces blue shifts in urea's H-N-H symmetric bending modes, which is evidence for direct interactions between the two cosolvents.
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Affiliation(s)
- Sarah G Zetterholm
- Department of Chemistry and Biochemistry , Mississippi College , P.O. Box 4036, Clinton , Mississippi 39058 , United States
| | - Genevieve A Verville
- Department of Chemistry and Biochemistry , University of Mississippi , P.O. Box 1848, University , Mississippi 38655 , United States
| | - Leeann Boutwell
- Department of Chemistry and Biochemistry , Mississippi College , P.O. Box 4036, Clinton , Mississippi 39058 , United States
| | - Christopher Boland
- Department of Chemistry and Biochemistry , University of Mississippi , P.O. Box 1848, University , Mississippi 38655 , United States
| | - John C Prather
- Department of Chemistry and Biochemistry , University of Mississippi , P.O. Box 1848, University , Mississippi 38655 , United States
| | - Jonathan Bethea
- Department of Chemistry and Biochemistry , Mississippi College , P.O. Box 4036, Clinton , Mississippi 39058 , United States
| | - Jordan Cauley
- Department of Chemistry and Biochemistry , University of Mississippi , P.O. Box 1848, University , Mississippi 38655 , United States.,Department of Chemistry and Biochemistry , Mississippi College , P.O. Box 4036, Clinton , Mississippi 39058 , United States
| | - Kayla E Warren
- Department of Chemistry and Biochemistry , University of Mississippi , P.O. Box 1848, University , Mississippi 38655 , United States
| | - Shelley A Smith
- Department of Chemistry and Biochemistry , Mississippi College , P.O. Box 4036, Clinton , Mississippi 39058 , United States
| | - David H Magers
- Department of Chemistry and Biochemistry , Mississippi College , P.O. Box 4036, Clinton , Mississippi 39058 , United States
| | - Nathan I Hammer
- Department of Chemistry and Biochemistry , University of Mississippi , P.O. Box 1848, University , Mississippi 38655 , United States
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Affiliation(s)
- Udo Kaatze
- Drittes Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany
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Differences in physico-chemical properties and behavior of urea and 1,1,3,3-tetramethylurea in the mixture of water with N , N -dimethylformamide at temperature range T = (293.15–308.15) K. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.09.096] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Agieienko V, Horinek D, Buchner R. Hydration and self-aggregation of a neutral cosolute from dielectric relaxation spectroscopy and MD simulations: the case of 1,3-dimethylurea. Phys Chem Chem Phys 2017; 19:219-230. [DOI: 10.1039/c6cp07407c] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
1,3-Dimethylurea irrotationally binds 1–2H2O molecules close to its carbonyl and impedes dynamics of ca. 40 H2O molecules by methyl substituents.
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Affiliation(s)
- Vira Agieienko
- Department of Physical Chemistry
- Kazan Federal University
- 420008 Kazan
- Russia
- Department of Inorganic Chemistry
| | - Dominik Horinek
- Institut für Physikalische und Theoretische Chemie
- Universität Regensburg
- D-93040 Regensburg
- Germany
| | - Richard Buchner
- Institut für Physikalische und Theoretische Chemie
- Universität Regensburg
- D-93040 Regensburg
- Germany
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Fujihara A, Itsuki K, Shimada N, Maruyama A, Sagawa N, Shikata T, Yusa SI. Preparation of ureido group bearing polymers and their upper critical solution temperature in water. ACTA ACUST UNITED AC 2016. [DOI: 10.1002/pola.28183] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Ami Fujihara
- Department of Applied Chemistry; University of Hyogo; Himeji Hyogo 671-2280 Japan
| | - Kohei Itsuki
- Department of Applied Chemistry; University of Hyogo; Himeji Hyogo 671-2280 Japan
| | - Naohiko Shimada
- Department of Life Science and Technology; Tokyo Institute of Technology; Nagatsuta, Midori Yokohama 226-8501 Japan
| | - Atsushi Maruyama
- Department of Life Science and Technology; Tokyo Institute of Technology; Nagatsuta, Midori Yokohama 226-8501 Japan
| | - Naoya Sagawa
- Department of Symbiotic Science of Environment and Natural Resources; The United Graduate School of Agriculture; Tokyo University of Agriculture and Technology; Fuchu Tokyo 183-8509 Japan
| | - Toshiyuki Shikata
- Department of Symbiotic Science of Environment and Natural Resources; The United Graduate School of Agriculture; Tokyo University of Agriculture and Technology; Fuchu Tokyo 183-8509 Japan
- Division of Natural Resources and Eco-Materials; Graduate School of Agriculture; Tokyo University of Agriculture and Technology; Fuchu Tokyo 183-8509 Japan
| | - Shin-Ichi Yusa
- Department of Applied Chemistry; University of Hyogo; Himeji Hyogo 671-2280 Japan
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