1
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Kitaoka H, Yokoyama Y, Sakka T, Nishi N. Salting-out and Competitive Adsorption of Ethanol into Lipid Bilayer Membranes: Conflicting Effects of Salts on Ethanol-Membrane Interactions Studied by Molecular Dynamics Simulations. J Phys Chem B 2024. [PMID: 39046846 DOI: 10.1021/acs.jpcb.4c03399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2024]
Abstract
Small amphiphilic molecules, such as ethanol, disturb the structure of lipid bilayer membranes to increase the membrane permeability, which is important for applications such as drug delivery, disinfection, and fermentation. To investigate how and the extent to which coexisting salts affect membrane disturbance, we performed molecular dynamics (MD) simulations on lipid bilayer membranes composed of zwitterionic lipids in aqueous ethanol solutions containing 0-631 mM NaCl, KCl, and KI salts. The addition of salts at low concentrations induced cationic adsorption on the lipid membrane, which competes with ethanol adsorption, thereby reducing the hydrogen bonds between ethanol and lipid molecules. This competitive adsorption mitigated the membrane disturbance and decreased the permeation of ethanol molecules into the membrane. In contrast, higher salt concentrations enhanced the membrane disturbance and permeability, which was caused by the salting-out of ethanol from the aqueous phase to the lipid bilayer. These conflicting effects appearing at different concentrations were stronger with the chloride salts than with the iodide salt. Among the two chloride salts, NaCl and KCl, the latter showed a greater enhancement in ethanol permeation at high concentrations. This seeming anti-Hofmeister salting-out behavior resulted from greater Na+ adsorption, preventing the ethanol-lipid interactions.
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Affiliation(s)
- Haru Kitaoka
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
| | - Yuko Yokoyama
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
- iCaNS, Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Tetsuo Sakka
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
- iCaNS, Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Naoya Nishi
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
- iCaNS, Institute of Advanced Energy, Kyoto University, Uji, Kyoto 611-0011, Japan
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2
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Higuchi Y, Saleh MA, Anada T, Tanaka M, Hishida M. Rotational Dynamics of Water near Osmolytes by Molecular Dynamics Simulations. J Phys Chem B 2024; 128:5008-5017. [PMID: 38728154 DOI: 10.1021/acs.jpcb.3c08470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2024]
Abstract
The behavior of water molecules around organic molecules has attracted considerable attention as a crucial factor influencing the properties and functions of soft matter and biomolecules. Recently, it has been suggested that the change in protein stability upon the addition of small organic molecules (osmolytes) is dominated by the change in the water dynamics caused by the osmolyte, where the dynamics of not only the directly interacting water molecules but also the long-range hydration layer affect the protein stability. However, the relation between the long-range structure of hydration water in various solutions and the water dynamics remains unclear at the molecular level. We performed density-functional tight-binding molecular dynamics simulations to elucidate the varying rotational dynamics of water molecules in 15 osmolyte solutions. A positive correlation was observed between the rotational relaxation time and our proposed normalized parameter obtained by dividing the number of hydrogen bonds between water molecules by the number of nearest-neighbor water molecules. For the 15 osmolyte solutions, an increase or a decrease in the value of the normalized parameter for the second hydration shell tended to result in water molecules with slow and fast rotational dynamics, respectively, thus illustrating the importance of the second hydration shell for the rotational dynamics of water molecules. Our simulation results are anticipated to advance the current understanding of water dynamics around organic molecules and the long-range structure of water molecules.
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Affiliation(s)
- Yuji Higuchi
- Research Institute for Information Technology, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Md Abu Saleh
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, Fukuoka 819-0395, Japan
| | - Takahisa Anada
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, Fukuoka 819-0395, Japan
- Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka 819-0395, Japan
| | - Masaru Tanaka
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, Fukuoka 819-0395, Japan
- Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka 819-0395, Japan
| | - Mafumi Hishida
- Department of Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan
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3
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Wang Z, Zhou J, Ji H, Liu J, Zhou Y, Qian T, Yan C. Principles and Design of Biphasic Self-Stratifying Batteries Toward Next-Generation Energy Storage. Angew Chem Int Ed Engl 2024; 63:e202320258. [PMID: 38456300 DOI: 10.1002/anie.202320258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 02/25/2024] [Accepted: 03/07/2024] [Indexed: 03/09/2024]
Abstract
Large-scale energy storage devices play pivotal roles in effectively harvesting and utilizing green renewable energies (such as solar and wind energy) with capricious nature. Biphasic self-stratifying batteries (BSBs) have emerged as a promising alternative for grid energy storage owing to their membraneless architecture and innovative battery design philosophy, which holds promise for enhancing the overall performance of the energy storage system and reducing operation and maintenance costs. This minireview aims to provide a timely review of such emerging energy storage technology, including its fundamental design principles, existing categories, and prototype architectures. The challenges and opportunities of this undergoing research topic will also be systematically highlighted and discussed to provide guidance for the subsequent R&D of superior BSBs while conducive to bridging the gap for their future practical application.
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Affiliation(s)
- Zhenkang Wang
- Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou, 213164, P. R. China
- Key Laboratory of Core Technology of High Specific Energy Battery and Key Materials for Petroleum and Chemical Industry, College of Energy, Soochow University, Suzhou, Jiangsu, 215006, P. R. China
| | - Jinqiu Zhou
- College of Chemistry and Chemical Engineering, Nantong University, Nantong, Jiangsu, 226019, P. R. China
| | - Haoqing Ji
- Key Laboratory of Core Technology of High Specific Energy Battery and Key Materials for Petroleum and Chemical Industry, College of Energy, Soochow University, Suzhou, Jiangsu, 215006, P. R. China
| | - Jie Liu
- College of Chemistry and Chemical Engineering, Nantong University, Nantong, Jiangsu, 226019, P. R. China
| | - Yang Zhou
- Key Laboratory of Core Technology of High Specific Energy Battery and Key Materials for Petroleum and Chemical Industry, College of Energy, Soochow University, Suzhou, Jiangsu, 215006, P. R. China
| | - Tao Qian
- College of Chemistry and Chemical Engineering, Nantong University, Nantong, Jiangsu, 226019, P. R. China
| | - Chenglin Yan
- Advanced Catalysis and Green Manufacturing Collaborative Innovation Center, Changzhou University, Changzhou, 213164, P. R. China
- Key Laboratory of Core Technology of High Specific Energy Battery and Key Materials for Petroleum and Chemical Industry, College of Energy, Soochow University, Suzhou, Jiangsu, 215006, P. R. China
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4
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Judd KD, Mendes de Oliveira D, Urbina AS, Ben-Amotz D. Influence of H +, OH - and salts on hydrophobic self-assembly. Chem Sci 2024; 15:6378-6384. [PMID: 38699259 PMCID: PMC11062122 DOI: 10.1039/d3sc06995h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Accepted: 03/26/2024] [Indexed: 05/05/2024] Open
Abstract
In spite of the ubiquity of acid/base ions and salts in biological systems, their influence on hydrophobic self-assembly remains an open question. Here we use a combined experimental and theoretical strategy to quantify the influence of H+ and OH-, as well as salts containing Li+, Na+, Cl- and Br-, on the hydrophobic self-assembly of micelles composed of neutral oily 1,2-hexanediol surfactants. The distributions of aggregate sizes, both below and above the critical micelle concentration (CMC), are determined using Raman multivariate curve resolution (Raman-MCR) spectroscopy to quantify the multi-aggregation chemical potential surface (MCPS) that drives self-assembly. The results reveal that ions have little influence on the formation of hydrophobic contact dimers but can significantly drive high-order self assembly. Moreover, the hydration-shells of oily solutes are found to expel the above salt ions and OH-, but to attract H+, with wide-ranging implications.
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Affiliation(s)
- Kenneth D Judd
- Department of Chemistry, Purdue University West Lafayette IN 47907 USA
| | | | - Andres S Urbina
- Department of Chemistry, Purdue University West Lafayette IN 47907 USA
| | - Dor Ben-Amotz
- Department of Chemistry, Purdue University West Lafayette IN 47907 USA
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5
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Tan X, Zhang J, Cao F, Liu Y, Yang H, Zhou Q, Li X, Wang R, Li Z, Hu H, Zhao Q, Wu M. Salt Effect Engineering Single Fe-N 2P 2-Cl Sites on Interlinked Porous Carbon Nanosheets for Superior Oxygen Reduction Reaction and Zn-Air Batteries. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2306599. [PMID: 38224212 DOI: 10.1002/advs.202306599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 12/04/2023] [Indexed: 01/16/2024]
Abstract
Developing efficient metal-nitrogen-carbon (M-N-C) single-atom catalysts for oxygen reduction reaction (ORR) is significant for the widespread implementation of Zn-air batteries, while the synergic design of the matrix microstructure and coordination environment of metal centers remains challenges. Herein, a novel salt effect-induced strategy is proposed to engineer N and P coordinated atomically dispersed Fe atoms with extra-axial Cl on interlinked porous carbon nanosheets, achieving a superior single-atom Fe catalyst (denoted as Fe-NP-Cl-C) for ORR and Zn-air batteries. The hierarchical porous nanosheet architecture can provide rapid mass/electron transfer channels and facilitate the exposure of active sites. Experiments and density functional theory (DFT) calculations reveal the distinctive Fe-N2P2-Cl active sites afford significantly reduced energy barriers and promoted reaction kinetics for ORR. Consequently, the Fe-NP-Cl-C catalyst exhibits distinguished ORR performance with a half-wave potential (E1/2) of 0.92 V and excellent stability. Remarkably, the assembled Zn-air battery based on Fe-NP-Cl-C delivers an extremely high peak power density of 260 mW cm-2 and a large specific capacity of 812 mA h g-1, outperforming the commercial Pt/C and most reported congeneric catalysts. This study offers a new perspective on structural optimization and coordination engineering of single-atom catalysts for efficient oxygen electrocatalysis and energy conversion devices.
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Affiliation(s)
- Xiaojie Tan
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao, 266580, China
| | - Jinqiang Zhang
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, SA, 5005, Australia
| | - Fengliang Cao
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao, 266580, China
| | - Yachao Liu
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao, 266580, China
| | - Hao Yang
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao, 266580, China
| | - Qiang Zhou
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao, 266580, China
| | - Xudong Li
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao, 266580, China
| | - Rui Wang
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao, 266580, China
| | - Zhongtao Li
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao, 266580, China
| | - Han Hu
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao, 266580, China
| | - Qingshan Zhao
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao, 266580, China
| | - Mingbo Wu
- State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, College of New Energy, China University of Petroleum (East China), Qingdao, 266580, China
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6
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González-Jiménez M, Liao Z, Williams EL, Wynne K. Lifting Hofmeister's Curse: Impact of Cations on Diffusion, Hydrogen Bonding, and Clustering of Water. J Am Chem Soc 2024; 146:368-376. [PMID: 38124370 PMCID: PMC10786029 DOI: 10.1021/jacs.3c09421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 12/11/2023] [Accepted: 12/12/2023] [Indexed: 12/23/2023]
Abstract
Water plays a role in the stability, reactivity, and dynamics of the solutes that it contains. The presence of ions alters this capacity by changing the dynamics and structure of water. However, our understanding of how and to what extent this occurs is still incomplete. Here, a study of the low-frequency Raman spectra of aqueous solutions of various cations by using optical Kerr-effect spectroscopy is presented. This technique allows for the measurement of the changes that ions cause in both the diffusive dynamics and the vibrations of the hydrogen-bond structure of water. It is found that when salts are added, some of the water molecules become part of the ion solvation layers, while the rest retain the same diffusional properties as those of pure water. The slowing of the dynamics of the water molecules in the solvation shell of each ion was found to depend on its charge density at infinite dilution conditions and on its position in the Hofmeister series at higher concentrations. It is also observed that all cations weaken the hydrogen-bond structure of the solution and that this weakening depends only on the size of the cation. Finally, evidence is found that ions tend to form amorphous aggregates, even at very dilute concentrations. This work provides a novel approach to water dynamics that can be used to better study the mechanisms of solute nucleation and crystallization, the structural stability of biomolecules, and the dynamic properties of complex solutions, such as water-in-salt electrolytes.
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Affiliation(s)
| | - Zhiyu Liao
- School of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K.
| | | | - Klaas Wynne
- School of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K.
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7
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Hervø-Hansen S, Lin D, Kasahara K, Matubayasi N. Free-energy decomposition of salt effects on the solubilities of small molecules and the role of excluded-volume effects. Chem Sci 2024; 15:477-489. [PMID: 38179544 PMCID: PMC10763565 DOI: 10.1039/d3sc04617f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Accepted: 11/20/2023] [Indexed: 01/06/2024] Open
Abstract
The roles of cations and anions are different in the perturbation on solvation, and thus, the analyses of the separated contributions from cations and anions are useful to establish molecular pictures of ion-specific effects. In this work, we investigate the effects of cations, anions, and water separately in the solvation of n-alcohols and n-alkanes by free-energy decomposition. By utilising energy-representation theory of solvation, we address the contributions arising from the direct solute-solvent interactions and the excluded-volume effects. It is found that the change in solvation of n-alcohols and n-alkanes upon addition of salt depends primarily on the anion species. The direct interaction between the anion and solute is in agreement with the Setschenow coefficient in terms of the ranking of salting-in and salting-out for n-alkanes, which corresponds to the extent of accumulation of the anion on the solute surface. For each of the n-alcohols and n-alkanes examined, the excluded-volume component in the Setschenow coefficient is well correlated to the (total) Setschenow coefficient when the salt effects are concerned. The ranking of the excluded-volume component in the variation of the salt species is parallel to the water contribution, which is correlated further to the change in the water density upon the addition of the salt.
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Affiliation(s)
- Stefan Hervø-Hansen
- Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University Toyonaka Osaka 560-8531 Japan
| | - Daoyang Lin
- Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University Toyonaka Osaka 560-8531 Japan
| | - Kento Kasahara
- Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University Toyonaka Osaka 560-8531 Japan
| | - Nobuyuki Matubayasi
- Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University Toyonaka Osaka 560-8531 Japan
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8
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Zhu J, Zhao Z, Li X, Wei Y. Structural and dynamical properties of concentrated alkali- and alkaline-earth metal chloride aqueous solutions. J Chem Phys 2023; 159:214503. [PMID: 38054516 DOI: 10.1063/5.0178123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Accepted: 11/12/2023] [Indexed: 12/07/2023] Open
Abstract
Concentrated ionic aqueous electrolytes possess a diverse array of applications across various fields, particularly in the field of energy storage. Despite extensive examination, the intricate relationships and numerous physical mechanisms underpinning diverse phenomena remain incompletely understood. Molecular dynamics simulations are employed to probe the attributes of aqueous solutions containing LiCl, NaCl, KCl, MgCl2, and CaCl2, spanning various solute fractions. The primary emphasis of the simulations is on unraveling the intricate interplay between these attributes and the underlying physical mechanisms. The configurations of cation-Cl- and Cl--Cl- pairs within these solutions are disclosed. As the solute fraction increases, consistent trends manifest regardless of solute type: (i) the number of hydrogen bonds formed by the hydration water surrounding ions decreases, primarily attributed to the growing presence of counter ions in proximity to the hydration water; (ii) the hydration number of ions exhibits varying trends influenced by multiple factor; and (iii) the diffusion of ions slows down, attributed to the enhanced confinement and rebound of cations and Cl- ions from the surrounding atoms, concurrently coupled with the changes in ion vibration modes. In our analysis, we have, for the first time, clarified the reasons behind the slowing down of the diffusion of the ions with increasing solute fraction. Our research contributes to a better understanding and manipulation of the attributes of ionic aqueous solutions and may help designing high-performance electrolytes.
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Affiliation(s)
- Jianzhuo Zhu
- Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
| | - Zhuodan Zhao
- Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
| | - Xingyuan Li
- Key Laboratory for Microstructural Material Physics of Hebei Province, School of Science, Yanshan University, Qinhuangdao 066004, China
| | - Yong Wei
- School of Information Science and Engineering, Yanshan University, Qinhuangdao 066004, China
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9
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Roterman I, Konieczny L. Protein Is an Intelligent Micelle. ENTROPY (BASEL, SWITZERLAND) 2023; 25:850. [PMID: 37372194 DOI: 10.3390/e25060850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Revised: 03/22/2023] [Accepted: 04/28/2023] [Indexed: 06/29/2023]
Abstract
Interpreting biological phenomena at the molecular and cellular levels reveals the ways in which information that is specific to living organisms is processed: from the genetic record contained in a strand of DNA, to the translation process, and then to the construction of proteins that carry the flow and processing of information as well as reveal evolutionary mechanisms. The processing of a surprisingly small amount of information, i.e., in the range of 1 GB, contains the record of human DNA that is used in the construction of the highly complex system that is the human body. This shows that what is important is not the quantity of information but rather its skillful use-in other words, this facilitates proper processing. This paper describes the quantitative relations that characterize information during the successive steps of the "biological dogma", illustrating a transition from the recording of information in a DNA strand to the production of proteins exhibiting a defined specificity. It is this that is encoded in the form of information and that determines the unique activity, i.e., the measure of a protein's "intelligence". In a situation of information deficit at the transformation stage of a primary protein structure to a tertiary or quaternary structure, a particular role is served by the environment as a supplier of complementary information, thus leading to the achievement of a structure that guarantees the fulfillment of a specified function. Its quantitative evaluation is possible via using a "fuzzy oil drop" (FOD), particularly with respect to its modified version. This can be achieved when taking into account the participation of an environment other than water in the construction of a specific 3D structure (FOD-M). The next step of information processing on the higher organizational level is the construction of the proteome, where the interrelationship between different functional tasks and organism requirements can be generally characterized by homeostasis. An open system that maintains the stability of all components can be achieved exclusively in a condition of automatic control that is realized by negative feedback loops. This suggests a hypothesis of proteome construction that is based on the system of negative feedback loops. The purpose of this paper is the analysis of information flow in organisms with a particular emphasis on the role of proteins in this process. This paper also presents a model introducing the component of changed conditions and its influence on the protein folding process-since the specificity of proteins is coded in their structure.
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Affiliation(s)
- Irena Roterman
- Department of Bioinformatics and Telemedicine, Jagiellonian University-Medical College, Medyczna 7, 30-688 Kraków, Poland
| | - Leszek Konieczny
- Chair of Medical Biochemistry, Jagiellonian University-Medical College, Kopernika 7, 31-034 Kraków, Poland
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10
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Mun SB, Cho BG, Jin SR, Lim CR, Yun YS, Cho CW. Adsorption of organic micropollutants on yeast: Batch experiment and modeling. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 334:117507. [PMID: 36809737 DOI: 10.1016/j.jenvman.2023.117507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 01/31/2023] [Accepted: 02/10/2023] [Indexed: 06/18/2023]
Abstract
Yeast is ubiquitous and may act as a solid phase in natural aquatic systems, which may affect the distribution of organic micropollutants (OMs). Therefore, it is important to understand the adsorption of OMs on yeast. Therefore, in this study, a predictive model for the adsorption values of OMs on the yeast was developed. For that, an isotherm experiment was performed to estimate the adsorption affinity of OMs on yeast (i.e., Saccharomyces cerevisiae). Afterwards, quantitative structure-activity relationship (QSAR) modeling was performed for the purpose of developing a prediction model and explaining the adsorption mechanism. For the modeling, empirical and in silico linear free energy relationship (LFER) descriptors were applied. The isotherm results showed that yeast adsorbs a wide range of OMs, but the magnitude of Kd strongly depends on the types of OMs. The measured log Kd values of the tested OMs ranged from -1.91 to 1.1. Additionally, it was confirmed that the Kd measured in distilled water is comparable to that measured in real anaerobic or aerobic wastewater (R2 = 0.79). In QSAR modeling, the Kd value could be predicted by the LFER concept with an R2 of 0.867 by empirical descriptors and an R2 of 0.796 by in silico descriptors. The adsorption mechanisms of yeast for OMs were identified in individual correlations between log Kd and each descriptor: Dispersive interaction, hydrophobicity, hydrogen-bond donor, and cationic Coulombic interaction of OMs attract the adsorption, while the hydrogen-bond acceptor and anionic Coulombic interaction of OMs act as repulsive forces. The developed model can be used as an efficient method to estimate OM adsorption to yeast at a low level of concentration.
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Affiliation(s)
- Se-Been Mun
- Department of Integrative Food, Bioscience and Biotechnology, Chonnam National University, Yongbong-ro 77, Buk-gu, 61186 Gwangju, Republic of Korea
| | - Bo-Gyeon Cho
- Department of Integrative Food, Bioscience and Biotechnology, Chonnam National University, Yongbong-ro 77, Buk-gu, 61186 Gwangju, Republic of Korea
| | - Se-Ra Jin
- Department of Integrative Food, Bioscience and Biotechnology, Chonnam National University, Yongbong-ro 77, Buk-gu, 61186 Gwangju, Republic of Korea
| | - Che-Ryong Lim
- School of Chemical Engineering Jeonbuk National University 567 Beakje-dearo, Deokjin-gu, Jeonju, Jeonbuk 561-756, South Korea
| | - Yeoung-Sang Yun
- School of Chemical Engineering Jeonbuk National University 567 Beakje-dearo, Deokjin-gu, Jeonju, Jeonbuk 561-756, South Korea.
| | - Chul-Woong Cho
- Department of Integrative Food, Bioscience and Biotechnology, Chonnam National University, Yongbong-ro 77, Buk-gu, 61186 Gwangju, Republic of Korea; Department of Bioenergy Science and Technology, Chonnam National University, Gwangju, South Korea.
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11
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Wise PK, Slipchenko LV, Ben-Amotz D. Ion-Size Dependent Adsorption Crossover on the Surface of a Water Droplet. J Phys Chem B 2023; 127:4658-4665. [PMID: 37186591 DOI: 10.1021/acs.jpcb.3c01797] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
The adsorption of ionic and neutral spherical solutes on the surface of a liquid water droplet are investigated using molecular dynamics simulations and theoretical analyses. The results reveal a crossover in the sign of the adsorption free energy as a function of ion size, with ions larger than iodide predicted to be increasingly surface active. Adsorption free energies are decomposed into competing energetic and entropic contributions arising from direct solute-water interaction energy and its fluctuations. The entropically driven surface activity of large ions is predicted to increase with ion size, while small ions are typically driven away from the interface by a more delicate balance of energetic and entropic contributions, with a nonmonotonic ion size dependence linked to the ion's hydration-shell structure and stability. The physical interpretation of the results is illuminated by comparisons with dielectric linear response and cavity formation predictions and implications to interfacial acidity and enhanced chemical reactivity are discussed.
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Affiliation(s)
- Patrick K Wise
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Lyudmila V Slipchenko
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Dor Ben-Amotz
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
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12
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Wei T, Ran T, Zhao W, Dai B. A Flocculation–Adsorption Self-Coupled System for Wastewater Treatment with the Aim of Water Reuse. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c03108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Affiliation(s)
- Tingting Wei
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi832003, China
| | - Tingmin Ran
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi832003, China
| | - Wei Zhao
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi832003, China
| | - Bin Dai
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi832003, China
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13
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Cerdeiriña CA. Water's Unusual Thermodynamics in the Realm of Physical Chemistry. J Phys Chem B 2022; 126:6608-6613. [PMID: 36001372 PMCID: PMC9797112 DOI: 10.1021/acs.jpcb.2c05274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
While it is known since the early work by Edsall, Frank and Evans, Kauzmann, and others that the thermodynamics of solvation of nonpolar solutes in water is unusual and has implications for the thermodynamics of protein folding, only recently have its connections with the unusual temperature dependence of the density of solvent water been illuminated. Such density behavior is, in turn, one of the manifestations of a nonstandard thermodynamic pattern contemplating a second, liquid-liquid critical point at conditions of temperature and pressure at which water exists as a deeply supercooled liquid. Recent experimental and computational work unambiguously points toward the existence of such a critical point, thereby providing concrete answers to the questions posed by the 1976 pioneering experiments by Speedy and Angell and the associated "liquid-liquid transition hypothesis" posited in 1992 by Stanley and co-workers. Challenges of this phenomenology to the branch of Statistical Mechanics remain.
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Abstract
Hydrogen bond charge transfer in water may have far-reaching chemical implications.
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Affiliation(s)
- Dor Ben-Amotz
- Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA
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Asakereh I, Lee K, Francisco OA, Khajehpour M. Hofmeister Effects of Group II Cations as Seen in the Unfolding of Ribonuclease A. Chemphyschem 2022; 23:e202100884. [PMID: 35421259 DOI: 10.1002/cphc.202100884] [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: 12/14/2021] [Revised: 04/14/2022] [Indexed: 11/06/2022]
Abstract
This work studies the effects of alkaline-earth cation addition upon the unfolding free energy of a model protein, pancreatic Ribonuclease A (RNase A) by DSC analysis. RNase A was chosen because it: a) does not specifically bind Mg 2+ , Ca 2+ and Sr 2+ cations and b) maintains its structural integrity throughout a large pH range. We have measured and compared the effects of NaCl, MgCl 2 , CaCl 2 and SrCl 2 addition on the melting point of RNase A. Our results show that even though the addition of group II cations to aqueous solvent reduces the solubility of nonpolar residues (and enhances the hydrophobic effect), their interactions with the amide moieties are strong enough to "salt-them-in" the solvent, thereby causing an overall reduction in protein stability. We demonstrate that amide-cation interactions are a major contributor to the observed "Hofmeister Effects" of group II cations in protein folding. Our analysis suggests that protein folding "Hofmeister Effects" of group II cations, are mostly the aggregate sum of how cation addition simultaneously salts-out hydrophobic moieties through increasing the cavitation free energy, while promoting the salting-in of amide moieties through contact pair formation.
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Affiliation(s)
- Iman Asakereh
- University of Manitoba, Chemistry, Dept of Chemistry, University of Manitob, Winnipeg, R3T2N2, Winnipeg, CANADA
| | - Katherine Lee
- University of Manitoba, Chemistry, Dept of Chemistry, University of Manitob, Winnipeg, R3T2N2, Winnipeg, CANADA
| | - Olga A Francisco
- University of Manitoba, Chemistry, Dept of Chemistry, University of Manitob, Winnipeg, R3T2N2, Winnipeg, CANADA
| | - Mazdak Khajehpour
- University of Manitoba, Chemistry, Dept of Chemistry, University of Manitob, R3T2N2, Winnipeg, CANADA
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Bredt AJ, Kim Y, Mendes de Oliveira D, Urbina AS, Slipchenko LV, Ben-Amotz D. Expulsion of Hydroxide Ions from Methyl Hydration Shells. J Phys Chem B 2022; 126:869-877. [PMID: 35077175 DOI: 10.1021/acs.jpcb.1c08420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The affinity of hydroxide ions for methyl hydration shells is assessed using a combined experimental and theoretical analysis of tert-butyl alcohol (TBA) dissolved in pure water and aqueous NaOH and NaI. The experimental results are obtained using Raman multivariate curve resolution (Raman-MCR) and a new three-component total least squares (Raman-TLS) spectral decomposition strategy used to highlight vibrational perturbations resulting from interactions between TBA and aqueous ions. The experiments are interpreted and extended with the aid of effective fragment potential molecular dynamics (EFP-MD) simulations, as well as Kirkwood-Buff calculations and octanol/water partition measurements, to relate TBA-ion distribution functions to TBA solubility changes. The combined experimental and simulation results reveal that methyl group hydration shells more strongly expel hydroxide than iodide anions, whose populations near the methyl groups of TBA are predicted to be correlated with sodium counterion localization near the TBA hydroxyl group.
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Affiliation(s)
- Aria J Bredt
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Yongbin Kim
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | | | - Andres S Urbina
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Lyudmila V Slipchenko
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Dor Ben-Amotz
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
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Martins AC, Benfica J, Perez-Sanchez G, Shimizu S, Sintra T, Schaeffer N, Coutinho JAP. Assessing the hydrotropic effect in the presence of electrolytes: competition between solute salting-out and salt-induced hydrotrope aggregation. Phys Chem Chem Phys 2022; 24:21645-21654. [DOI: 10.1039/d2cp00749e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Water solubility enhancement is a long-standing challenge in a multitude of chemistry-related fields. Hydrotropy is a simple and efficient method to improve the solubility of hydrophobic molecules in aqueous media....
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Okamoto R, Koga K. Theory of Gas Solubility and Hydrophobic Interaction in Aqueous Electrolyte Solutions. J Phys Chem B 2021; 125:12820-12831. [PMID: 34756051 DOI: 10.1021/acs.jpcb.1c08050] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Ion-specific effects on the solubility of nonpolar solutes and on the solute-solute hydrophobic interaction in aqueous electrolyte solutions are studied on the basis of a continuum theory that incorporates the excluded volume of the molecules using the four-component (water, cations, anions, and solutes) Boublı́k-Mansoori-Carnahan-Starling-Leland model and ion hydration (electrostriction) using the Born model. We examine how the ordering of ions in the salt effect on the solubility as measured by the Sechenov coefficient KS changes with varying sizes of ions and solutes. Our calculation reproduces the general trend of experimentally measured KS and also provides insight into the irregular behavior of KS for lithium ion. The correlation between KS and the salt effect on the hydrophobic interaction that has been pointed out earlier is accounted for by an explicit connection between KS and the salt-enhanced-association coefficient CI in the expansion of the second osmotic virial coefficient B(ns) = B(0) - CIns + ··· in powers of the salt density ns at fixed pressure and temperature. The quadratic relation CI≈KS2/4 is derived for ions and solutes that are not very large.
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Affiliation(s)
- Ryuichi Okamoto
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
| | - Kenichiro Koga
- Research Institute for Interdisciplinary Science, Okayama University, Okayama 700-8530, Japan
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