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Susrisweta B, Veselý L, Štůsek R, Hauptmann A, Loerting T, Heger D. Investigating freezing-induced acidity changes in citrate buffers. Int J Pharm 2023; 643:123211. [PMID: 37422143 DOI: 10.1016/j.ijpharm.2023.123211] [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: 06/06/2023] [Revised: 07/04/2023] [Accepted: 07/05/2023] [Indexed: 07/10/2023]
Abstract
Citrate buffers are commonly utilized in the field of biomolecule stabilization. We investigate their applicability in the frozen state within a range of initial pHs (2.5 to 8.0) and concentrations (0.02 to 0.60 M). Citrate buffer solutions subjected to various cooling and heating temperatures are examined in terms of the freezing-induced acidity changes, revealing that citrate buffers acidify upon cooling. The acidity is assessed with sulfonephthalein molecular probes frozen in the samples. Optical cryomicroscopy combined with differential scanning calorimetry was employed to investigate the causes of the observed acidity changes. The buffers partly crystallize and partly vitrify in the ice matrix; these processes influence the resulting pH and allow designing the optimal storage temperatures in the frozen state. The freezing-induced acidification apparently depends on the buffer concentration; at each pH, we suggest pertinent concentration, at which freezing causes minimal acidification.
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Affiliation(s)
- Behera Susrisweta
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Lukáš Veselý
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | - Radim Štůsek
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic
| | | | - Thomas Loerting
- Institute of Physical Chemistry, University of Innsbruck, Innrain 52c, 6020 Innsbruck, Austria
| | - Dominik Heger
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic.
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2
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Toro-Mendoza J. ACS Omega: Writing a New Chapter in a One-Hundred-Year-Old Partnership between Latin America and the American Chemical Society. ACS OMEGA 2023; 8:10641-10642. [PMID: 37008111 PMCID: PMC10061528 DOI: 10.1021/acsomega.3c01437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
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3
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Yao Y, Alpert PA, Zuend A, Wang B. Does liquid-liquid phase separation impact ice nucleation in mixed polyethylene glycol and ammonium sulfate droplets? Phys Chem Chem Phys 2022; 25:80-95. [PMID: 36281770 DOI: 10.1039/d2cp04407b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Particles can undergo different phase transitions in the atmosphere including deliquescence, liquid-liquid phase separation (LLPS), melting, and freezing. In this study, phase transitions of particles/droplets containing polyethylene glycol with a molar mass of 400 g mol-1 (PEG400) and ammonium sulfate (AS), i.e., PEG400-AS particles/droplets, were investigated at different organic-to-inorganic dry mass ratios (OIRs) under typical tropospheric temperatures and water activities (aw). The investigated droplets (60-100 μm) with or without LLPS in the closed system froze through homogeneous ice nucleation. At temperatures lower than 200 K, multiple ice nucleation events were observed within the same individual droplets at low aw. Droplets with and without LLPS shared similar lambda values at the same OIR according to the lambda approach indicating they form ice through the same mechanism. A parameterization of lambda values was provided which can be used to predict freezing temperature of aqueous PEG400-AS droplets. We found that adding AS reduces the temperature dependence of aw in aqueous PEG400 droplets. Assuming incorrectly that aw is temperature-independent for a constant droplet composition leads to a deviation between the experimental determined ice nucleation rate coefficients for droplets at OIR > 1 and the predicted values by the water-activity-based ice nucleation theory. We proposed a parameterization of temperature dependence of aw to minimize the deviations of the measured melting temperatures and nucleation rate coefficients from the corresponding predictions for aqueous PEG400-AS system.
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Affiliation(s)
- Yao Yao
- State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China.,College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China.
| | - Peter A Alpert
- Laboratory of Environmental Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland
| | - Andreas Zuend
- Department of Atmospheric and Oceanic Sciences, McGill University, Montréal, Quebec, Canada
| | - Bingbing Wang
- State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China.,College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China.
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4
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Affiliation(s)
- Franz M Geiger
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - V Faye McNeill
- Departments of Chemical Engineering and Earth and Environmental Sciences, Columbia University, New York, New York 10027, United States
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5
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Geiger FM, McNeill VF, Orr-Ewing AJ. Virtual Issue in Atmospheric Chemistry Research. J Phys Chem A 2020; 124:5697-5699. [PMID: 32668907 DOI: 10.1021/acs.jpca.0c05353] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Franz M Geiger
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - V Faye McNeill
- Department of Chemical Engineering, Columbia University, New York, New York 10027, United States
| | - Andrew J Orr-Ewing
- School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
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6
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Moll CJ, Meister K, Versluis J, Bakker HJ. Freezing of Aqueous Carboxylic Acid Solutions on Ice. J Phys Chem B 2020; 124:5201-5208. [PMID: 32414235 PMCID: PMC7322724 DOI: 10.1021/acs.jpcb.9b10462] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
We study the properties of acetic
acid and propionic acid solutions
at the surface of monocrystalline ice with surface-specific vibrational
sum-frequency generation (VSFG) and heterodyne-detected vibrational
sum-frequency generation spectroscopy (HD-VSFG). When we decrease
the temperature toward the eutectic point of the acid solutions, we
observe the formation of a freeze concentrated solution (FCS) of the
carboxylic acids that is brought about by a freeze-induced phase separation
(FIPS). The freeze concentrated solution freezes on top of the ice
surface as we cool the system below the eutectic point. We find that
for freeze concentrated acetic acid solutions the freezing causes
a strong decrease of the VSFG signal, while for propionic acid an
increase and a blue-shift are observed. This different behavior points
at a distinct difference in molecular-scale behavior when cooling
below the eutectic point. We find that cooling of the propionic acid
solution below the eutectic point leads to the formation of hydrogen-bonded
dimers with an opposite alignment of the carboxylic acid O–H
groups.
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Affiliation(s)
- Carolyn J Moll
- AMOLF, Science Park 104, Amsterdam 1098 XG, The Netherlands
| | - Konrad Meister
- AMOLF, Science Park 104, Amsterdam 1098 XG, The Netherlands.,Max-Planck Institute for Polymer Research, Ackermannweg 10, Mainz D 55128, Germany.,University of Alaska Southeast, Juneau, Alaska 99801, United States
| | - Jan Versluis
- AMOLF, Science Park 104, Amsterdam 1098 XG, The Netherlands
| | - Huib J Bakker
- AMOLF, Science Park 104, Amsterdam 1098 XG, The Netherlands
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7
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John M, Choudhury T, Filimonov R, Kurvinen E, Saeed M, Mikkola A, Mänttäri M, Louhi-Kultanen M. Impurity separation efficiency of multi-component wastewater in a pilot-scale freeze crystallizer. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2019.116271] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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8
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Imrichová K, Veselý L, Gasser TM, Loerting T, Neděla V, Heger D. Vitrification and increase of basicity in between ice Ihcrystals in rapidly frozen dilute NaCl aqueous solutions. J Chem Phys 2019; 151:014503. [DOI: 10.1063/1.5100852] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Affiliation(s)
- Kamila Imrichová
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 62500 Brno, Czech Republic
- Institute of Scientific Instruments of the ASCR, v.v.i., Královopolská 147, 61264 Brno, Czech Republic
| | - Lukáš Veselý
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 62500 Brno, Czech Republic
| | - Tobias M. Gasser
- Institute of Physical Chemistry, University of Innsbruck, A-6020 Innsbruck, Austria
| | - Thomas Loerting
- Institute of Physical Chemistry, University of Innsbruck, A-6020 Innsbruck, Austria
| | - Vilém Neděla
- Institute of Scientific Instruments of the ASCR, v.v.i., Královopolská 147, 61264 Brno, Czech Republic
| | - Dominik Heger
- Department of Chemistry, Faculty of Science, Masaryk University, Kamenice 5, 62500 Brno, Czech Republic
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John M, Suominen M, Sormunen OV, Hasan M, Kurvinen E, Kujala P, Mikkola A, Louhi-Kultanen M. Purity and mechanical strength of naturally frozen ice in wastewater basins. WATER RESEARCH 2018; 145:418-428. [PMID: 30176505 DOI: 10.1016/j.watres.2018.08.063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 08/23/2018] [Accepted: 08/28/2018] [Indexed: 06/08/2023]
Abstract
A fairly clean ice cover can form over a contaminated water pond when the air-cooled surface of water freezes and impurities are efficiently expelled to the remaining water underneath. Natural freeze crystallization has recently been studied as a potential wastewater purification method with aqueous solutions on a laboratory scale. The effect of impurity inclusions on ice strength has been researched in model ice basins over the past few decades. It is of interest to discover how efficiently natural freeze separation works under real weather conditions before freezing can be utilized for wastewater treatment application. Herein, understanding the mechanical strength properties of naturally frozen wastewater (ice) is important when planning ice breaking and harvesting devices. This research implemented in-situ measurements of the flexural and compressive strength of ice in natural ice-covered environments of a freshwater lake, two peatlands and three mining site basins, and compares the determined strength with analyzed impurities of the ice. The results showed that despite varying ice growth conditions and initial water constituents, it was possible to deduce an evident yet simple relationship between mean ice strength and ice impurities: the more impure the ice is, the lower the value of strength is Based on this exploration, it was concluded that separation efficiencies, i.e. the impurity removal ratio between basin water and ice, from 65% up to 90% can be achieved by natural freezing.
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Affiliation(s)
- Miia John
- Department of Separation and Purification Technology, LUT School of Engineering Science, Lappeenranta University of Technology, P.O. Box 20, FI-53850 Lappeenranta, Finland.
| | - Mikko Suominen
- Department of Mechanical Engineering, School of Engineering, Aalto University, P.O. Box 15300, FI-00076 Aalto, Finland
| | - Otto-Ville Sormunen
- Department of Mechanical Engineering, School of Engineering, Aalto University, P.O. Box 15300, FI-00076 Aalto, Finland
| | - Mehdi Hasan
- Department of Separation and Purification Technology, LUT School of Engineering Science, Lappeenranta University of Technology, P.O. Box 20, FI-53850 Lappeenranta, Finland
| | - Emil Kurvinen
- Department of Mechanical Engineering, LUT School of Energy Systems, Lappeenranta University of Technology, P.O. Box 20, FI-53850 Lappeenranta, Finland
| | - Pentti Kujala
- Department of Mechanical Engineering, School of Engineering, Aalto University, P.O. Box 15300, FI-00076 Aalto, Finland
| | - Aki Mikkola
- Department of Mechanical Engineering, LUT School of Energy Systems, Lappeenranta University of Technology, P.O. Box 20, FI-53850 Lappeenranta, Finland
| | - Marjatta Louhi-Kultanen
- Department of Chemical and Metallurgical Engineering, School of Chemical Engineering, Aalto University, P.O. Box 16100, FI-00076 Aalto, Finland
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AlRyalat SA, Rawashdeh K, El khatib O, Yasin A, Alqadi F, Saleh N, Malkawi L, Hijjawi O, Alessa M. The change from an eponym to a representative name: Wegener to granulomatosis with polyangiitis. Scientometrics 2018. [DOI: 10.1007/s11192-018-2951-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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11
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Bogdan A. Ice Clouds: Atmospheric Ice Nucleation Concept versus the Physical Chemistry of Freezing Atmospheric Drops. J Phys Chem A 2018; 122:7777-7781. [PMID: 30282456 DOI: 10.1021/acs.jpca.8b07926] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Anatoli Bogdan
- Laboratory of Polymer Chemistry, Department of Chemistry , University of Helsinki , P.O. Box 55, FI-00014 Helsinki , Finland.,Department of Physics , University of Helsinki , P.O. Box 48, FI-00014 Helsinki , Finland
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12
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Theoretical modeling of the mechanism of aniline oxidation by singlet O2. Russ Chem Bull 2018. [DOI: 10.1007/s11172-018-2259-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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13
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Losey DJ, Ott EJE, Freedman MA. Effects of High Acidity on Phase Transitions of an Organic Aerosol. J Phys Chem A 2018; 122:3819-3828. [DOI: 10.1021/acs.jpca.8b00399] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Delanie J. Losey
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Emily-Jean E. Ott
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Miriam Arak Freedman
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
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14
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Kitada K, Suda Y, Takenaka N. Acceleration and Reaction Mechanism of the N-Nitrosation Reaction of Dimethylamine with Nitrite in Ice. J Phys Chem A 2017; 121:5383-5388. [PMID: 28662583 DOI: 10.1021/acs.jpca.7b03246] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Some reactions (e.g., oxidation of nitrite, denitrification of ammonium) are accelerated in freeze-concentrated solution (FCS) compared to those in aqueous solution. Ice is highly intolerant to impurities, and the ice excludes those that would accelerate reactions. Here we show the acceleration of the N-nitrosation reaction of dimethylamine (DMA) with nitrite to produce N-nitrosodimethylamine (NDMA) in FCS. NDMA is a carcinogenic compound, and this reaction is potentially accelerated in frozen fish/meat. The eaction rate of the N-nitrosation reaction becomes fastest at specific pH. This means that it is a third-order reaction. Theoretical pH values of the peak in the third-order reaction are higher than the experimental one. Freeze-concentration of acidic solution causes pH decrement; however, the freeze-concentration alone could not explain the difference of pH values. The theoretical value was obtained under the assumption that no solute took part in ice. However, solutes are incorporated in ice with a small distribution coefficient of solutes into ice. This small incorporation enhanced the decrement of pH values. Using the distribution coefficient of chloride and sodium ion and assuming those of nitrite and DMA to explain the enhancement, we succeeded in estimating the distribution coefficients of nitrite: 2 × 10-3 and DMA: 3 × 10-2.
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Affiliation(s)
- Kodai Kitada
- Laboratory of Environmental Materials Chemistry, Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University , 1-1 Gakuen-cho, Naka-ku, Sakai-shi, Osaka 599-8531, Japan
| | - Yusuke Suda
- Laboratory of Environmental Materials Chemistry, Department of Sustainable System Sciences, Graduate School of Humanities and Sustainable System Sciences, Osaka Prefecture University , 1-1 Gakuen-cho, Naka-ku, Sakai-shi, Osaka 599-8531, Japan
| | - Norimichi Takenaka
- Laboratory of Environmental Materials Chemistry, Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University , 1-1 Gakuen-cho, Naka-ku, Sakai-shi, Osaka 599-8531, Japan
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