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Souna AJ, Motevaselian MH, Polster JW, Tran JD, Siwy ZS, Aluru NR, Fourkas JT. Beyond the electrical double layer model: ion-dependent effects in nanoscale solvent organization. Phys Chem Chem Phys 2024; 26:6726-6735. [PMID: 38323484 DOI: 10.1039/d3cp05712g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2024]
Abstract
The nanoscale organization of electrolyte solutions at interfaces is often described well by the electrical double-layer model. However, a recent study has shown that this model breaks down in solutions of LiClO4 in acetonitrile at a silica interface, because the interface imposes a strong structuring in the solvent that in turn determines the preferred locations of cations and anions. As a surprising consequence of this organisation, the effective surface potential changes from negative at low electrolyte concentration to positive at high electrolyte concentration. Here we combine previous ion-current measurements with vibrational sum-frequency-generation spectroscopy experiments and molecular dynamics simulations to explore how the localization of ions at the acetonitrile-silica interface depends on the sizes of the anions and cations. We observe a strong, synergistic effect of the cation and anion identities that can prompt a large difference in the ability of ions to partition to the silica surface, and thereby influence the effective surface potential. Our results have implications for a wide range of applications that involve electrolyte solutions in polar aprotic solvents at nanoscale interfaces.
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Affiliation(s)
- Amanda J Souna
- Department of Chemistry & Biochemistry, University of Maryland, College Park, MD 20742, USA
| | - Mohammad H Motevaselian
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61820, USA.
| | - Jake W Polster
- Department of Chemistry, University of California Irvine, Irvine, CA 92697, USA
| | - Jason D Tran
- Department of Chemistry & Biochemistry, University of Maryland, College Park, MD 20742, USA
| | - Zuzanna S Siwy
- Department of Chemistry, University of California Irvine, Irvine, CA 92697, USA
- Department of Physics and Astronomy, University of California Irvine, Irvine, CA 92697, USA
- Department of Biomedical Engineering, University of California Irvine, Irvine, CA 92697, USA
| | - Narayana R Aluru
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61820, USA.
- Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA
- Oden Institute for Computational Engineering and Sciences, The University of Texas at Austin, Austin, TX 78712, USA
| | - John T Fourkas
- Department of Chemistry & Biochemistry, University of Maryland, College Park, MD 20742, USA
- Institute for Physical Sciences and Technology, University of Maryland, College Park, MD 20742, USA
- Maryland Quantum Materials Center, University of Maryland, College Park, MD 20742, USA
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2
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Wijitwongwan RP, Ogawa M. NiFe Layered Double Hydroxides with Controlled Composition and Morphology for the Efficient Removal of Cr(VI) from Water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:1408-1417. [PMID: 38163296 DOI: 10.1021/acs.langmuir.3c03076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
A layered double hydroxide (LDH) composed of Ni2+ and Fe3+ with a Fe3+/(Ni2+ + Fe3+) ratio of 0.05, which is not commonly available, was successfully prepared by coprecipitation from an aqueous solution of glycerol containing nickel nitrate and iron nitrate. Precipitation using NaOH as a precipitating agent at room temperature or 120 °C under hydrothermal conditions gave products with micrometer-sized aggregates of nanometer-sized unshaped particles, while that using urea yielded LDHs with a foam-like porous architecture composed of platy particles with a size of 100-300 nm. The products were examined to remove Cr(VI) from an acidic (pH = 3) aqueous solution of K2Cr2O7 by adsorption and photocatalytic reduction. The foam-like porous NiFe-LDH exhibited the highest adsorbed amount (122 mg g-1) and rate (0.017 g mg-1 min-1) in the dark and the highest rate (0.012 min-1) of photocatalytic Cr(VI) reduction among the NiFe-LDHs prepared in the present study, which can be explained as a positive effect of the foam-like porous architecture. These performances were superior to those of other reported LDHs, showing the importance of the composition and the particle morphology to boost the removal of Cr(VI).
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Affiliation(s)
- Rattanawadee Ploy Wijitwongwan
- School of Energy Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), 555 Moo 1 Payupnai, Wangchan, Rayong 21210, Thailand
| | - Makoto Ogawa
- School of Energy Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), 555 Moo 1 Payupnai, Wangchan, Rayong 21210, Thailand
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Zhu F, Tan X, Zhao W, Feng L, He S, Wei L, Yang L, Wang K, Zhao Q. Efficiency assessment of ZVI-based media as fillers in permeable reactive barrier for multiple heavy metal-contaminated groundwater remediation. JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127605. [PMID: 34741938 DOI: 10.1016/j.jhazmat.2021.127605] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2021] [Revised: 10/11/2021] [Accepted: 10/23/2021] [Indexed: 05/27/2023]
Abstract
Four zero valent iron-based composites were prepared and applied as the reactive media of permeable reactive barriers. Batch tests and continuous-flow column experiments were conducted to assess the long-term performance of these composites for possible utilization as fillers for PRB. The experimental results of the batch tests revealed that in single-metal systems, the removal efficiency of Cu(Ⅱ), Co(Ⅱ), Cr(Ⅵ) and As(Ⅲ) could reach 98% at equilibrium. Equilibrium data showed that composites displayed different selectivity values in binary and quaternary-component systems. For the continuous tests, column filled with chitosan-zero valent iron-based composites, exhibited optimal removal efficiency and achieved average removal values of 98.84%, 88.28%, 95.65% and 87.10% for Cu(Ⅱ), Co(Ⅱ), Cr(Ⅵ) and As(Ⅲ) during the whole 30-day operation, respectively. Dynamic removal improvement of multiple metals was observed with further assembly media, with average removal of 99.11%, 90.05% and 87.34% for Cu(Ⅱ), Co(Ⅱ) and As(Ⅲ), respectively. Combined with superficial characteristic analysis, the functional groups distributed on the surface of composites played a key role in metal sorption. Moreover, the adsorbed Cu(Ⅱ), Co(Ⅱ) and Cr(Ⅵ) gradually transferred to the mobile phase when the operational periods were prolonged, while As(Ⅲ) became more stable.
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Affiliation(s)
- Fengyi Zhu
- School of Environment, Harbin Institute of Technology, Harbin 150090, China; State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), Harbin Institute of Technology, Harbin 150090, China
| | - Xuefei Tan
- College of Materials and Chemical Engineering, Heilongjiang Institute of Technology, Harbin 100050, China
| | - Weixin Zhao
- School of Environment, Harbin Institute of Technology, Harbin 150090, China; State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), Harbin Institute of Technology, Harbin 150090, China
| | - Likui Feng
- School of Environment, Harbin Institute of Technology, Harbin 150090, China; State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), Harbin Institute of Technology, Harbin 150090, China
| | - Shufei He
- School of Environment, Harbin Institute of Technology, Harbin 150090, China; State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), Harbin Institute of Technology, Harbin 150090, China
| | - Liangliang Wei
- School of Environment, Harbin Institute of Technology, Harbin 150090, China; State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), Harbin Institute of Technology, Harbin 150090, China.
| | - Lin Yang
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150090, China
| | - Kun Wang
- School of Environment, Harbin Institute of Technology, Harbin 150090, China; State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), Harbin Institute of Technology, Harbin 150090, China
| | - Qingliang Zhao
- School of Environment, Harbin Institute of Technology, Harbin 150090, China; State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), Harbin Institute of Technology, Harbin 150090, China
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Kon K, Uchida K, Fuku K, Yamanaka S, Wu B, Yamazui D, Iguchi H, Kobayashi H, Gambe Y, Honma I, Takaishi S. Electron-Conductive Metal-Organic Framework, Fe(dhbq)(dhbq = 2,5-Dihydroxy-1,4-benzoquinone): Coexistence of Microporosity and Solid-State Redox Activity. ACS APPLIED MATERIALS & INTERFACES 2021; 13:38188-38193. [PMID: 34353024 DOI: 10.1021/acsami.1c06571] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Redox-active metal-organic frameworks (MOFs) have great potential for use as cathode materials in lithium-ion batteries (LIBs) with large capacities because the organic ligands can undergo multiple-electron redox processes. However, most MOFs are electrical insulators, limiting their application as electrode materials. Here, we report an electron-conductive MOF with a 2,5-dihydroxy-1,4-benzoquinone (dhbq) ligand, Fe(dhbq). This compound had an electrical conductivity of 5 × 10-6 S cm-1 at room temperature due to d-π interactions between the Fe ion and the ligand and the permanent microporosity. Fe(dhbq) had an initial discharge capacity of 264 mA h g-1, corresponding to the two-electron redox process of dhbq.
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Affiliation(s)
- Kazuki Kon
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Kaiji Uchida
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Kentaro Fuku
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Shuntaro Yamanaka
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Bin Wu
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Daiki Yamazui
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Hiroaki Iguchi
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
| | - Hiroaki Kobayashi
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi 980-8577, Japan
| | - Yoshiyuki Gambe
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi 980-8577, Japan
| | - Itaru Honma
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Miyagi 980-8577, Japan
| | - Shinya Takaishi
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, Miyagi 980-8578, Japan
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5
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Patil KR, Surwade AD, Rajput PJ, Shaikh VR. Investigations of solute–solvent interactions in aqueous solutions of amino acids ionic liquids having the common nitrate as anion at different temperatures. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115546] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Limiting Partial Molar Volumes (V∞23) in Solvent (1) − [Solute (2) + Solute (3)] Systems and the Effects of Ionic Hydration on V∞23. J SOLUTION CHEM 2019. [DOI: 10.1007/s10953-019-00875-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Oberholzer P, Tervoort E, Bouzid A, Pasquarello A, Kundu D. Oxide versus Nonoxide Cathode Materials for Aqueous Zn Batteries: An Insight into the Charge Storage Mechanism and Consequences Thereof. ACS APPLIED MATERIALS & INTERFACES 2019; 11:674-682. [PMID: 30521309 DOI: 10.1021/acsami.8b16284] [Citation(s) in RCA: 75] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Aqueous Zn-ion batteries, which are being proposed as large-scale energy storage solutions because of their unparalleled safety and cost advantage, are composed of a positive host (cathode) material, a metallic zinc anode, and a mildly acidic aqueous electrolyte (pH ≈ 3-7). Typically, the charge storage mechanism is believed to be reversible Zn2+ (de)intercalation in the cathode host, with the exception of α-MnO2, for which multiple vastly different and contradicting mechanisms have been proposed. However, our present study, combining electrochemical, operando X-ray diffraction, electron microscopy in conjunction with energy-dispersive X-ray spectroscopy, and in situ pH evolution analyses on two oxide hosts-tunneled α-MnO2 and layered V3O7·H2O vis-à-vis two nonoxide hosts-layered VS2 and tunneled Zn3[Fe(CN)6]2, suggests that oxides and nonoxides follow two dissimilar charge storage mechanisms. While the oxides behave as dominant proton intercalation materials, the nonoxides undergo exclusive zinc intercalation. Stabilization of H+ on the hydroxyl-terminated oxide surface is revealed to facilitate the proton intercalation by a preliminary molecular dynamics simulation study. Proton intercalation for both oxides leads to the precipitation of layered double hydroxide (LDH)-Zn4SO4(OH)6·5H2O with a ZnSO4/H2O electrolyte and a triflate anion (CF3SO3-)-based LDH with a Zn(SO3CF3)2/H2O electrolyte-on the electrode surface. The LDH precipitation buffers the pH of the electrolytes to a mildly acidic value, sustaining the proton intercalation to deliver large specific capacities for the oxides. Moreover, we also show that the stability of the LDH precipitate is crucial for the rechargeability of the oxide cathodes, revealing a critical link between the charge storage mechanism and the performance of the oxide hosts in aqueous zinc batteries.
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Affiliation(s)
- Pascal Oberholzer
- Multifunctional Materials, Department of Materials , ETH Zurich , Vladimir Prelog Weg 5 , 8093 Zurich , Switzerland
| | - Elena Tervoort
- Multifunctional Materials, Department of Materials , ETH Zurich , Vladimir Prelog Weg 5 , 8093 Zurich , Switzerland
| | - Assil Bouzid
- Chaire de Simulation à l'Échelle Atomique (CSEA) , École Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne , Switzerland
| | - Alfredo Pasquarello
- Chaire de Simulation à l'Échelle Atomique (CSEA) , École Polytechnique Fédérale de Lausanne (EPFL) , CH-1015 Lausanne , Switzerland
| | - Dipan Kundu
- Multifunctional Materials, Department of Materials , ETH Zurich , Vladimir Prelog Weg 5 , 8093 Zurich , Switzerland
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8
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Assaf KI, Nau WM. The Chaotropic Effect as an Assembly Motif in Chemistry. Angew Chem Int Ed Engl 2018; 57:13968-13981. [PMID: 29992706 PMCID: PMC6220808 DOI: 10.1002/anie.201804597] [Citation(s) in RCA: 194] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 07/01/2018] [Indexed: 11/26/2022]
Abstract
Following up on scattered reports on interactions of conventional chaotropic ions (for example, I- , SCN- , ClO4- ) with macrocyclic host molecules, biomolecules, and hydrophobic neutral surfaces in aqueous solution, the chaotropic effect has recently emerged as a generic driving force for supramolecular assembly, orthogonal to the hydrophobic effect. The chaotropic effect becomes most effective for very large ions that extend beyond the classical Hofmeister scale and that can be referred to as superchaotropic ions (for example, borate clusters and polyoxometalates). In this Minireview, we present a continuous scale of water-solute interactions that includes the solvation of kosmotropic, chaotropic, and hydrophobic solutes, as well as the creation of void space (cavitation). Recent examples for the association of chaotropic anions to hydrophobic synthetic and biological binding sites, lipid bilayers, and surfaces are discussed.
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Affiliation(s)
- Khaleel I. Assaf
- Department of Life Sciences and ChemistryJacobs University BremenCampus Ring 128759BremenGermany
| | - Werner M. Nau
- Department of Life Sciences and ChemistryJacobs University BremenCampus Ring 128759BremenGermany
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9
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Affiliation(s)
- Khaleel I. Assaf
- Department of Life Sciences and Chemistry; Jacobs University Bremen; Campus Ring 1 28759 Bremen Deutschland
| | - Werner M. Nau
- Department of Life Sciences and Chemistry; Jacobs University Bremen; Campus Ring 1 28759 Bremen Deutschland
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10
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Śmiechowski M. Unusual Influence of Fluorinated Anions on the Stretching Vibrations of Liquid Water. J Phys Chem B 2018. [PMID: 29513989 DOI: 10.1021/acs.jpcb.7b11334] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Infrared (IR) spectroscopy is a commonly used and invaluable tool in the studies of solvation phenomena in aqueous solutions. Concurrently, ab initio molecular dynamics (AIMD) simulations deliver the solvation shell picture at a molecular detail level and allow for a consistent decomposition of the theoretical IR spectrum into underlying spatial correlations. Here, we demonstrate how the novel spectral decomposition techniques can extract important information from the computed IR spectra of aqueous solutions of BF4- and PF6-, interesting weakly coordinating anions that have been known for a long time to alter the IR spectrum of water in an unusual manner. The distance-dependent spectra of both ions are analyzed using the spectral similarity method that provides a quantitative picture of both the spectrum of the solute-affected solvent and the number of solvent molecules thus altered. We find, in accordance with previous experiments, a considerable blue shift of the νOH stretching band of liquid water by 264 cm-1 for BF4- and 306 cm-1 for PF6-, with the affected numbers being 3.7 and 4.2, respectively. Considering also the additional information on solute-solvent dipolar couplings delivered by radially and spatially resolved IR spectra, the computational IR spectroscopy based on AIMD simulations is shown to be a viable predictive tool with strong interpretative power.
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Affiliation(s)
- Maciej Śmiechowski
- Department of Physical Chemistry, Chemical Faculty , Gdańsk University of Technology , Narutowicza 11/12 , 80-233 Gdańsk , Poland
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Thorat AA, Forny L, Meunier V, Taylor LS, Mauer LJ. Effects of Chloride and Sulfate Salts on the Inhibition or Promotion of Sucrose Crystallization in Initially Amorphous Sucrose-Salt Blends. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:11259-11272. [PMID: 29182869 DOI: 10.1021/acs.jafc.7b04746] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The effects of salts on the stability of amorphous sucrose and its crystallization in different environments were investigated. Chloride (LiCl, NaCl, KCl, MgCl2, CaCl2, CuCl2, FeCl2, FeCl3, and AlCl3) and sulfate salts with the same cations (Na2SO4, K2SO4, MgSO4, CuSO4, Fe(II)SO4, and Fe(III)SO4) were studied. Samples (sucrose controls and sucrose:salt 1:0.1 molar ratios) were lyophilized, stored in controlled temperature and relative humidity (RH) conditions, and monitored for one month using X-ray diffraction. Samples were also analyzed by differential scanning calorimetry, microscopy, and moisture sorption techniques. All lyophiles were initially amorphous, but during storage the presence of a salt had a variable impact on sucrose crystallization. While all samples remained amorphous when stored at 11 and 23% RH at 25 °C, increasing the RH to 33 and 40% RH resulted in variations in crystallization onset times. The recrystallization time generally followed the order monovalent cations < sucrose < divalent cations < trivalent cations. The presence of a salt typically increased water sorption as compared to sucrose alone when stored at the same RH; however, anticrystallization effects were observed for sucrose combined with salts containing di- and trivalent cations in spite of the increased water content. The cation valency and hydration number played a major role in dictating the impact of the added salt on sucrose crystallization.
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Affiliation(s)
- Alpana A Thorat
- Department of Food Science, Purdue University , 745 Agriculture Mall Drive, West Lafayette, 9 Indiana 47907, United States
- Department of Industrial and Physical Pharmacy, Purdue University , 575 Stadium Mall Drive, West Lafayette, Indiana 47907, United States
| | - Laurent Forny
- Nestlé Research Center, Vers-chez-les-Blanc , Route du Jorat, 1005 Lausanne, Switzerland
| | - Vincent Meunier
- Nestlé Research Center, Vers-chez-les-Blanc , Route du Jorat, 1005 Lausanne, Switzerland
| | - Lynne S Taylor
- Department of Industrial and Physical Pharmacy, Purdue University , 575 Stadium Mall Drive, West Lafayette, Indiana 47907, United States
| | - Lisa J Mauer
- Department of Food Science, Purdue University , 745 Agriculture Mall Drive, West Lafayette, 9 Indiana 47907, United States
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Banipal TS, Kaur N, Kaur J, Komal, Banipal PK. Modulation of physicochemical and spectroscopic properties of l-serine and l-proline by propionate based food preservatives. Food Chem 2016; 209:220-7. [PMID: 27173555 DOI: 10.1016/j.foodchem.2016.04.056] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2015] [Revised: 04/14/2016] [Accepted: 04/17/2016] [Indexed: 11/25/2022]
Abstract
To have an insight into the effect of preservatives on various ingredients of processed items, it is important to study their thermodynamic, transport and spectroscopic properties in aqueous solutions to elucidate various solute-co-solute interactions. The densities, viscosities and enthalpies of dilution of l-serine and l-proline have been determined in water and in aqueous solutions of sodium propionate and calcium propionate at different temperatures. The derived parameters elucidate the changes in taste quality and hydration number of l-serine and l-proline in the presence of the studied preservatives. Predominance of dehydration effect has been observed from calorimetry and changes in chemical shifts from nuclear magnetic resonance spectroscopy also support the above results.
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Affiliation(s)
- Tarlok S Banipal
- Department of Chemistry, Guru Nanak Dev University, Amritsar 143005, Punjab, India.
| | - Navalpreet Kaur
- Department of Chemistry, Guru Nanak Dev University, Amritsar 143005, Punjab, India
| | - Jaspreet Kaur
- Department of Chemistry, Guru Nanak Dev University, Amritsar 143005, Punjab, India
| | - Komal
- Department of Chemistry, Guru Nanak Dev University, Amritsar 143005, Punjab, India
| | - Parampaul K Banipal
- Department of Chemistry, Guru Nanak Dev University, Amritsar 143005, Punjab, India
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14
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Banipal TS, Kaur N, Kaur A, Gupta M, Banipal PK. Effect of food preservatives on the hydration properties and taste behavior of amino acids: a volumetric and viscometric approach. Food Chem 2015; 181:339-46. [PMID: 25794759 DOI: 10.1016/j.foodchem.2015.02.061] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2014] [Revised: 02/13/2015] [Accepted: 02/14/2015] [Indexed: 10/23/2022]
Abstract
Thermodynamic and transport properties of aqueous solutions are very useful in the elucidation of solute-solvent and solute-solute interactions, which help to understand the hydration and taste behavior of solutes. The densities and viscosities of L-glycine, β-alanine and L-leucine have been determined in water and in aqueous solutions of sodium propionate (NaP) and calcium propionate (CaP) at temperatures 298.15 and 308.15K. From these data, apparent molar volumes (V2,ϕ), viscosity B-coefficients and corresponding transfer parameters (ΔtrV2,ϕo and ΔtrB) have been calculated. The dB/dT values suggest that L-glycine and β-alanine act as structure-breaker, while L-leucine acts as structure-maker both in water and in aqueous solutions of NaP and CaP. The decrease in hydration number and change in taste behavior have also been observed with increasing concentration of the cosolute.
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Affiliation(s)
- Tarlok S Banipal
- Department of chemistry, Guru Nanak Dev University, Amritsar 143005, Punjab, India.
| | - Navalpreet Kaur
- Department of chemistry, Guru Nanak Dev University, Amritsar 143005, Punjab, India
| | - Amanpreet Kaur
- Department of chemistry, Guru Nanak Dev University, Amritsar 143005, Punjab, India
| | - Mehak Gupta
- Department of chemistry, Guru Nanak Dev University, Amritsar 143005, Punjab, India
| | - Parampaul K Banipal
- Department of chemistry, Guru Nanak Dev University, Amritsar 143005, Punjab, India
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