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Rhamnolipid Self-Aggregation in Aqueous Media: A Long Journey toward the Definition of Structure–Property Relationships. Int J Mol Sci 2023; 24:ijms24065395. [PMID: 36982468 PMCID: PMC10048978 DOI: 10.3390/ijms24065395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 03/06/2023] [Accepted: 03/07/2023] [Indexed: 03/16/2023] Open
Abstract
The need to protect human and environmental health and avoid the widespread use of substances obtained from nonrenewable sources is steering research toward the discovery and development of new molecules characterized by high biocompatibility and biodegradability. Due to their very widespread use, a class of substances for which this need is particularly urgent is that of surfactants. In this respect, an attractive and promising alternative to commonly used synthetic surfactants is represented by so-called biosurfactants, amphiphiles naturally derived from microorganisms. One of the best-known families of biosurfactants is that of rhamnolipids, which are glycolipids with a headgroup formed by one or two rhamnose units. Great scientific and technological effort has been devoted to optimization of their production processes, as well as their physicochemical characterization. However, a conclusive structure–function relationship is far from being defined. In this review, we aim to move a step forward in this direction, by presenting a comprehensive and unified discussion of physicochemical properties of rhamnolipids as a function of solution conditions and rhamnolipid structure. We also discuss still unresolved issues that deserve further investigation in the future, to allow the replacement of conventional surfactants with rhamnolipids.
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2
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Specific electrolyte effects on hemoglobin in denaturing medium investigated through electro spray ionization mass spectrometry. J Inorg Biochem 2022; 234:111872. [DOI: 10.1016/j.jinorgbio.2022.111872] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 04/29/2022] [Accepted: 05/19/2022] [Indexed: 12/14/2022]
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3
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Lusci G, Pivetta T, Carucci C, Parsons DF, Salis A, Monduzzi M. BSA fragmentation specifically induced by added electrolytes: An electrospray ionization mass spectrometry investigation. Colloids Surf B Biointerfaces 2022; 218:112726. [PMID: 35914467 DOI: 10.1016/j.colsurfb.2022.112726] [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: 03/24/2022] [Revised: 07/16/2022] [Accepted: 07/24/2022] [Indexed: 10/16/2022]
Abstract
Biointerfaces are significantly affected by electrolytes according to the Hofmeister series. This work reports a systematic investigation on the effect of different metal chlorides, sodium and potassium bromides, iodides and thiocyanates, on the ESI/MS spectra of bovine serum albumin (BSA) in aqueous solution at pH = 2.7. The concentration of each salt was varied to maximize the quality of the ESI/MS spectrum, in terms of peak intensity and bell-shaped profile. The ESI/MS spectra of BSA in the absence and in the presence of salts showed a main protein pattern characterized by the expected mass of 66.5 kDa, except the case of BSA/RbCl (mass 65.3 kDa). In all systems we observed an additional pattern, characterized by at least three peaks with low intensity, whose deconvolution led to suggest the formation of a BSA fragment with a mass of 19.2 kDa. Only NaCl increased the intensity of the peaks of the main BSA pattern, while minimizing that of the fragment. NaCl addition seems to play a crucial role in stabilizing the BSA ionized interface against hydrolysis of peptide bonds, through different synergistic mechanisms. To quantify the observed specific electrolyte effects, two "Hofmeister" parameters (Hs and Ps) are proposed. They are obtained using the ratio of (BSA-Salt)/BSA peak intensities for both the BSA main pattern and for its fragment. SYNOPSIS: NaCl stabilizes BSA ion and almost prevents fragmentation due to denaturing pH.
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Affiliation(s)
- Gloria Lusci
- Dept. Chemical and Geological Science, University of Cagliari, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, Cagliari, Italy
| | - Tiziana Pivetta
- Dept. Chemical and Geological Science, University of Cagliari, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, Cagliari, Italy
| | - Cristina Carucci
- Dept. Chemical and Geological Science, University of Cagliari, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, Cagliari, Italy; Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), via della Lastruccia 3, 50019, Sesto Fiorentino (FI), Italy. Unità Operativa University of Cagliari, Cittadella Universitaria, SS 554 bivio Sestu, 09042 Monserrato (CA), Italy
| | - Drew Francis Parsons
- Dept. Chemical and Geological Science, University of Cagliari, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, Cagliari, Italy; Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), via della Lastruccia 3, 50019, Sesto Fiorentino (FI), Italy. Unità Operativa University of Cagliari, Cittadella Universitaria, SS 554 bivio Sestu, 09042 Monserrato (CA), Italy.
| | - Andrea Salis
- Dept. Chemical and Geological Science, University of Cagliari, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, Cagliari, Italy; Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), via della Lastruccia 3, 50019, Sesto Fiorentino (FI), Italy. Unità Operativa University of Cagliari, Cittadella Universitaria, SS 554 bivio Sestu, 09042 Monserrato (CA), Italy.
| | - Maura Monduzzi
- Dept. Chemical and Geological Science, University of Cagliari, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, Cagliari, Italy; Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), via della Lastruccia 3, 50019, Sesto Fiorentino (FI), Italy. Unità Operativa University of Cagliari, Cittadella Universitaria, SS 554 bivio Sestu, 09042 Monserrato (CA), Italy.
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4
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Parsons DF, Carucci C, Salis A. Buffer-specific effects arise from ionic dispersion forces. Phys Chem Chem Phys 2022; 24:6544-6551. [DOI: 10.1039/d2cp00223j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Buffer solutions do not simply regulate pH, but also change the properties of protein molecules. The zeta potential of lysozyme varies significantly at the same buffer concentration, in the order...
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5
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Zhang Y, Liao M, Guo J, Xu N, Xie X, Fan Q. The co-transport of Cd(Ⅱ) with nanoscale As 2S 3 in soil-packed column: Effects of ionic strength. CHEMOSPHERE 2022; 286:131628. [PMID: 34333186 DOI: 10.1016/j.chemosphere.2021.131628] [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: 05/27/2021] [Revised: 06/25/2021] [Accepted: 07/20/2021] [Indexed: 06/13/2023]
Abstract
To observe the co-transport of Cd(Ⅱ) with nanoscale As2S3 (nAs2S3) in a soil-packed column under different ionic strength (IS). A soil-packed column experiment with Cd(Ⅱ) and nAs2S3 was conducted. The results show that the transport of Cd(Ⅱ) was facilitated remarkably in the presence of nAs2S3, and nano-associated-Cd(Ⅱ) was the major migration type. However, the co-transport of Cd(Ⅱ) and nAs2S3 was affected by IS. The Cd(Ⅱ) concentration in the effluent to initial Cd(Ⅱ) concentration decreased from 38.75% to 29.95% and 22.28% as IS increased from 1 mM to 10 mM and 50 mM. When IS was 1 mm, 10 mm and 50 mm, the retention of nAs2S3 increased from 74.29% to 78.95% and 85.9% respectively. The agglomeration and sedimentation of nAs2S3 were the main reason for the rise of retention. Due to the increase of retention and reduction in adsorption capacity of nAs2S3 to Cd(Ⅱ), the ratio of migration in the form of nano-associated-Cd(Ⅱ) reduced from 53% (IS 1 mM) to 27.4% (IS 10 mM) and 18.2% (IS 50 mM). During the transport, the IS promoted desorption of Cd(Ⅱ) from nAs2S3 so that more soluble Cd was monitored in the effluent as IS increased. In general, these findings can provide references for controlling the risk caused by the co-transport of nAs2S3 and Cd(Ⅱ) in saline-alkali soil.
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Affiliation(s)
- Yuhao Zhang
- College of Environmental and Resource Science, Zhejiang University, Yuhangtang Road No.866, Hangzhou, 310058, China; Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Yuhangtang Road No.866, Hangzhou, 310058, China
| | - Min Liao
- College of Environmental and Resource Science, Zhejiang University, Yuhangtang Road No.866, Hangzhou, 310058, China; Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Yuhangtang Road No.866, Hangzhou, 310058, China.
| | - Jiawen Guo
- College of Environmental and Resource Science, Zhejiang University, Yuhangtang Road No.866, Hangzhou, 310058, China; Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Yuhangtang Road No.866, Hangzhou, 310058, China
| | - Na Xu
- College of Environmental and Resource Science, Zhejiang University, Yuhangtang Road No.866, Hangzhou, 310058, China; Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Yuhangtang Road No.866, Hangzhou, 310058, China
| | - Xiaomei Xie
- College of Environmental and Resource Science, Zhejiang University, Yuhangtang Road No.866, Hangzhou, 310058, China; National Demonstration Center for Experimental Environmental and Resources Education (Zhejiang University), Yuhangtang Road No.866, Hangzhou, 310058, China.
| | - Qiyan Fan
- College of Environmental and Resource Science, Zhejiang University, Yuhangtang Road No.866, Hangzhou, 310058, China; National Demonstration Center for Experimental Environmental and Resources Education (Zhejiang University), Yuhangtang Road No.866, Hangzhou, 310058, China
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6
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Ribeiro SS, Castro TG, Gomes CM, Marcos JC. Hofmeister effects on protein stability are dependent on the nature of the unfolded state. Phys Chem Chem Phys 2021; 23:25210-25225. [PMID: 34730580 DOI: 10.1039/d1cp02477a] [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
The interpretation of a salt's effect on protein stability traditionally discriminates low concentration regimes (<0.3 M), dominated by electrostatic forces, and high concentration regimes, generally described by ion-specific Hofmeister effects. However, increased theoretical and experimental studies have highlighted observations of the Hofmeister phenomena at concentration ranges as low as 0.001 M. Reasonable quantitative predictions of such observations have been successfully achieved throughout the inclusion of ion dispersion forces in classical electrostatic theories. This molecular description is also on the basis of quantitative estimates obtained resorting to surface/bulk solvent partition models developed for ion-specific Hofmeister effects. However, the latter are limited by the availability of reliable structures representative of the unfolded state. Here, we use myoglobin as a model to explore how ion-dependency on the nature of the unfolded state affects protein stability, combining spectroscopic techniques with molecular dynamic simulations. To this end, the thermal and chemical stability of myoglobin was assessed in the presence of three different salts (NaCl, (NH4)2SO4 and Na2SO4), at physiologically relevant concentrations (0-0.3 M). We observed mild destabilization of the native state induced by each ion, attributed to unfavorable neutralization and hydrogen-bonding with the protein side-chains. Both effects, combined with binding of Na+, Cl- and SO42- to the thermally unfolded state, resulted in an overall destabilization of the protein. Contrastingly, ion binding was hindered in the chemically unfolded conformation, due to occupation of the binding sites by urea molecules. Such mechanistic action led to a lower degree of destabilization, promoting surface tension effects that stabilized myoglobin according to the Hofmeister series. Therefore, we demonstrate that Hofmeister effects on protein stability are modulated by the heterogeneous physico-chemical nature of the unfolded state. Altogether, our findings evidence the need to characterize the structure of the unfolded state when attempting to dissect the molecular mechanisms underlying the effects of salts on protein stability.
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Affiliation(s)
- Sara S Ribeiro
- Centre of Chemistry, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
| | - Tarsila G Castro
- Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Cláudio M Gomes
- Biosystems and Integrative Sciences Institute, Faculdade de Ciências and Departamento de Química e Bioquímica, Universidade de Lisboa, 1749-016 Lisboa, Portugal
| | - João C Marcos
- Centre of Chemistry, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
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7
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Katana B, Takács D, Szerlauth A, Sáringer S, Varga G, Jamnik A, Bobbink FD, Dyson PJ, Szilagyi I. Aggregation of Halloysite Nanotubes in the Presence of Multivalent Ions and Ionic Liquids. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:11869-11879. [PMID: 34601883 PMCID: PMC8515846 DOI: 10.1021/acs.langmuir.1c01949] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 09/16/2021] [Indexed: 06/13/2023]
Abstract
Colloidal stability was investigated in two types of particle systems, namely, with bare (h-HNT) and polyimidazolium-functionalized (h-HNT-IP-2) alkali-treated halloysite nanotubes in solutions of metal salts and ionic liquids (ILs). The valence of the metal ions and the number of carbon atoms in the hydrocarbon chain of the IL cations (1-methylimidazolium (MIM+), 1-ethyl-3-methylimidazolium (EMIM+), 1-butyl-3-methylimidazolium (BMIM+), and 1-hexyl-3-methylimidazolium (HMIM+)) were altered in the measurements. For the bare h-HNT with a negative surface charge, multivalent counterions destabilized the dispersions at low values of critical coagulation concentration (CCC) in line with the Schulze-Hardy rule. In the presence of ILs, significant adsorption of HMIM+ took place on the h-HNT surface, leading to charge neutralization and overcharging at appropriate concentrations. A weaker affinity was observed for MIM+, EMIM+, and BMIM+, while they adsorbed on the particles to different extents. The order HMIM+ < BMIM+ < EMIM+ < MIM+ was obtained for the CCCs of h-HNT, indicating that HMIM+ was the most effective in the destabilization of the colloids. For h-HNT-IP-2 with a positive surface charge, no specific interaction was observed between the salt and the IL constituent cations and the particles, i.e., the determined charge and aggregation parameters were the same within experimental error, irrespective of the type of co-ions. These results clearly indicate the relevance of ion adsorption in the colloidal stability of the nanotubes and thus provide useful information for further design of processable h-HNT dispersions.
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Affiliation(s)
- Bojana Katana
- MTA-SZTE
Lendület Biocolloids Research Group, Interdisciplinary Excellence
Center, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary
| | - Dóra Takács
- MTA-SZTE
Lendület Biocolloids Research Group, Interdisciplinary Excellence
Center, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary
| | - Adél Szerlauth
- MTA-SZTE
Lendület Biocolloids Research Group, Interdisciplinary Excellence
Center, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary
| | - Szilárd Sáringer
- MTA-SZTE
Lendület Biocolloids Research Group, Interdisciplinary Excellence
Center, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary
| | - Gábor Varga
- Material
and Solution Structure Research Group, Department of Organic Chemistry, University of Szeged, H-6720 Szeged, Hungary
| | - Andrej Jamnik
- Faculty
of Chemistry and Chemical Technology, University
of Ljubljana, Večna pot 113, SI-1000 Ljubljana, Slovenia
| | - Felix D. Bobbink
- Institute
of Chemical Sciences and Engineering, École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Paul J. Dyson
- Institute
of Chemical Sciences and Engineering, École
Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Istvan Szilagyi
- MTA-SZTE
Lendület Biocolloids Research Group, Interdisciplinary Excellence
Center, Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary
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8
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The Anion Binding Affinity Determines the Strength of Anion Specificities of Thermosensitive Polymers. CHINESE JOURNAL OF POLYMER SCIENCE 2021. [DOI: 10.1007/s10118-021-2633-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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9
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A Hofmeister series perspective on the mixed micellization of cationic and non-ionic surfactants. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116205] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Blackwell R, Hemmerle A, Baer A, Späth M, Peukert W, Parsons D, Sengupta K, Smith AS. On the control of dispersion interactions between biological membranes and protein coated biointerfaces. J Colloid Interface Sci 2021; 598:464-473. [PMID: 33951546 DOI: 10.1016/j.jcis.2021.02.078] [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: 11/20/2020] [Revised: 02/03/2021] [Accepted: 02/17/2021] [Indexed: 11/28/2022]
Abstract
HYPOTHESIS Interaction of cellular membranes with biointerfaces is of vital importance for a number of medical devices and implants. Adhesiveness of these surfaces and cells is often regulated by depositing a layer of bovine serum albumin (BSA) or other protein coatings. However, anomalously large separations between phospholipid membranes and the biointerfaces in various conditions and buffers have been observed, which could not be understood using available theoretical arguments. METHODS Using the Lifshitz theory, we here evaluate the distance-dependent Hamaker coefficient describing the dispersion interaction between a biointerface and a membrane to understand the relative positioning of two surfaces. Our theoretical modeling is supported by experiments where the biointerface is represented by a glass substrate with deposited BSA and protein layers. These biointerfaces are allowed to interact with giant unilamellar vesicles decorated with polyethylene glycol (PEG) using PEG lipids to mimic cellular membranes and their pericellular coat. RESULTS We demonstrate that careful treatment of the van der Waals interactions is critical for explaining the lack of adhesiveness of the membranes with protein-decorated biointerfaces. We show that BSA alone indeed passivates the glass, but depositing an additional protein layer on the surface BSA, or producing multiple layers of proteins and BSA results in repulsive dispersion forces responsible for 100 nm large equilibrium separations between the two surfaces.
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Affiliation(s)
- Robert Blackwell
- PULS Group, Department of Physics and Interdisciplinary Center for Nanostructured Films, Friedrich-Alexander-Universität Erlangen-Nürnberg, IZNF, Cauerstrasse 3, 91058 Erlangen, Germany.
| | - Arnaud Hemmerle
- Aix-Marseille Université, Centre Interdisciplinaire de Nanosciences de Marseille, CNRS, UMR 7325, Campus de Luminy, 13288 Marseille cedex 9, France.
| | - Andreas Baer
- PULS Group, Department of Physics and Interdisciplinary Center for Nanostructured Films, Friedrich-Alexander-Universität Erlangen-Nürnberg, IZNF, Cauerstrasse 3, 91058 Erlangen, Germany.
| | - Matthias Späth
- PULS Group, Department of Physics and Interdisciplinary Center for Nanostructured Films, Friedrich-Alexander-Universität Erlangen-Nürnberg, IZNF, Cauerstrasse 3, 91058 Erlangen, Germany
| | - Wolfgang Peukert
- Institute of Particle Technology, Interdisciplinary Center for Functional Particle Systems, Friedrich-Alexander-Universität Erlangen-Nürnberg, Haberstrasse 9a, 91058 Erlangen, Germany.
| | - Drew Parsons
- Department of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria, 09042 Monserrato, CA, Italy; Discipline of Physics, Chemistry and Mathematics, College of Science Health Engineering and Education, Murdoch University, Murdoch, 6150 WA, Australia.
| | - Kheya Sengupta
- Aix-Marseille Université, Centre Interdisciplinaire de Nanosciences de Marseille, CNRS, UMR 7325, Campus de Luminy, 13288 Marseille cedex 9, France.
| | - Ana-Sunčana Smith
- PULS Group, Department of Physics and Interdisciplinary Center for Nanostructured Films, Friedrich-Alexander-Universität Erlangen-Nürnberg, IZNF, Cauerstrasse 3, 91058 Erlangen, Germany; Division of Physical Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia.
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11
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Lian L, Liu L, Ding Y, Hua Z, Liu G. Specific Anion Effects on Charged-Neutral Random Copolymers: Interplay between Different Anion-Polymer Interactions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:1697-1706. [PMID: 33499598 DOI: 10.1021/acs.langmuir.0c02907] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The study of ion specificities of charged-neutral random copolymers is of great importance for understanding specific ion effects on natural macromolecules. In the present work, we have investigated the specific anion effects on the thermoresponsive behavior of poly([2-(methacryloyloxy)ethyl trimethylammonium chloride]-co-N-isopropylacrylamide) [P(METAC-co-NIPAM)] random copolymers. Our study demonstrates that the anion specificities of the P(METAC-co-NIPAM) copolymers are dependent on their chemical compositions. The specific anion effects on the copolymers with high mole fractions of poly(N-isopropylacrylamide) (PNIPAM) are similar to those on the PNIPAM homopolymer. As the mole fraction of PNIPAM decreases to a certain value, a V-shaped anion series can be observed in terms of the anion-specific cloud point temperature of the copolymer, as induced by the interplay between different anion-polymer interactions. Our study also suggests that both the direct and the indirect anion-polymer interactions contribute to the anion specificities of the copolymers. This work would improve our understanding of the relationship between the ion specificities and the ion-macromolecule interactions for naturally occurring macromolecules.
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Affiliation(s)
- Leilei Lian
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Lvdan Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Yanwei Ding
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, P. R. China
| | - Zan Hua
- Biomass Molecular Engineering Center, Department of Materials Science and Engineering, Anhui Agricultural University, Hefei 230036, P. R. China
| | - Guangming Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China
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12
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Katana B, Takács D, Csapó E, Szabó T, Jamnik A, Szilagyi I. Ion Specific Effects on the Stability of Halloysite Nanotube Colloids-Inorganic Salts versus Ionic Liquids. J Phys Chem B 2020; 124:9757-9765. [PMID: 33076658 PMCID: PMC7660744 DOI: 10.1021/acs.jpcb.0c07885] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Revised: 10/09/2020] [Indexed: 11/30/2022]
Abstract
Charging and aggregation processes were studied in aqueous dispersions of halloysite nanotubes (HNTs) in the presence of monovalent inorganic electrolytes and ionic liquid (IL) constituents. The same type of co-ion (same sign of charge as HNT) was used in all systems, while the type of counterions (opposite sign of charge as HNT) was systematically varied. The affinity of the inorganic cations to the HNT surface influenced their destabilizing power leading to an increase in the critical coagulation concentration (CCC) of HNT dispersions in the Cs+ < K+ < Na+ order. This trend agrees with the classical Hofmeister series for negatively charged hydrophobic surfaces. For the IL cations, the CCCs increased in the order BMPY+ < BMPIP+ < BMPYR+ < BMIM+. An unexpectedly strong adsorption of BMPY+ cations on the HNT surface was observed giving rise to charge neutralization and reversal of the oppositely charged outer surface of HNT. The direct Hofmeister series was extended with these IL cations. The main aggregation mechanism was rationalized within the classical theory developed by Derjaguin, Landau, Verwey, and Overbeek, while ion specific effects resulted in remarkable variation in the CCC values. The results unambiguously proved that the hydration level of the surface and the counterions plays a crucial role in the formation of the ionic composition at the solid-liquid interface and consequently, in the colloidal stability of the HNT particles in both inorganic salt and IL solutions.
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Affiliation(s)
- Bojana Katana
- MTA-SZTE
Lendület Biocolloids Research Group and Interdisciplinary Excellence Center,
Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary
| | - Dóra Takács
- MTA-SZTE
Lendület Biocolloids Research Group and Interdisciplinary Excellence Center,
Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary
| | - Edit Csapó
- MTA-SZTE
Lendület Biocolloids Research Group and Interdisciplinary Excellence Center,
Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary
| | - Tamás Szabó
- MTA-SZTE
Lendület Biocolloids Research Group and Interdisciplinary Excellence Center,
Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary
| | - Andrej Jamnik
- Faculty
of Chemistry and Chemical Technology, University
of Ljubljana, SI-1000 Ljubljana, Slovenia
| | - Istvan Szilagyi
- MTA-SZTE
Lendület Biocolloids Research Group and Interdisciplinary Excellence Center,
Department of Physical Chemistry and Materials Science, University of Szeged, H-6720 Szeged, Hungary
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13
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Salis A, Cappai L, Carucci C, Parsons DF, Monduzzi M. Specific Buffer Effects on the Intermolecular Interactions among Protein Molecules at Physiological pH. J Phys Chem Lett 2020; 11:6805-6811. [PMID: 32787211 DOI: 10.1021/acs.jpclett.0c01900] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
BSA and lysozyme molecular motion at pH 7.15 is buffer-specific. Adsorption of buffer ions on protein surfaces modulates the protein surface charge and thus protein-protein interactions. Interactions were estimated by means of the interaction parameter kD obtained from plots of diffusion coefficients at different protein concentrations (Dapp = D0[1 + kDCprotein]) via dynamic light scattering and nuclear magnetic resonance. The obtained results agree with recent findings confirming doubts regarding the validity of the Henderson-Hasselbalch equation, which has traditionally provided a basis for understanding pH buffers of primary importance in solution chemistry, electrochemistry, and biochemistry.
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Affiliation(s)
- Andrea Salis
- Department of Chemical and Geological Sciences, University of Cagliari, and Centro NanoBiotecnologie Sardegna (CNBS), Cittadella Universitaria, SS 554 bivio Sestu, 09042 Monserrato (CA), Italy
- Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), Florence, Italy
- Unità Operativa University of Cagliari, Cagliari, Italy
| | - Luca Cappai
- Department of Chemical and Geological Sciences, University of Cagliari, and Centro NanoBiotecnologie Sardegna (CNBS), Cittadella Universitaria, SS 554 bivio Sestu, 09042 Monserrato (CA), Italy
| | - Cristina Carucci
- Department of Chemical and Geological Sciences, University of Cagliari, and Centro NanoBiotecnologie Sardegna (CNBS), Cittadella Universitaria, SS 554 bivio Sestu, 09042 Monserrato (CA), Italy
- Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), Florence, Italy
- Unità Operativa University of Cagliari, Cagliari, Italy
| | - Drew F Parsons
- Discipline of Chemistry and Physics, College of Science, Health, Engineering & Education, Murdoch University, 90 South Street, Murdoch, WA 6150, Australia
| | - Maura Monduzzi
- Department of Chemical and Geological Sciences, University of Cagliari, and Centro NanoBiotecnologie Sardegna (CNBS), Cittadella Universitaria, SS 554 bivio Sestu, 09042 Monserrato (CA), Italy
- Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), Florence, Italy
- Unità Operativa University of Cagliari, Cagliari, Italy
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14
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Carucci C, Raccis F, Salis A, Magner E. Specific ion effects on the enzymatic activity of alcohol dehydrogenase fromSaccharomyces cerevisiae. Phys Chem Chem Phys 2020; 22:6749-6754. [DOI: 10.1039/c9cp06800g] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The specific activity andVmax, but notKm, of alcohol dehydrogenase fromSaccharomyces cerevisiaeare ion specific.
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Affiliation(s)
- Cristina Carucci
- Department of Chemical Sciences
- Synthesis and Solid State Pharmaceutical Centre (SSPC) and Bernal Institute
- University of Limerick
- Limerick
- Ireland
| | - Francesco Raccis
- Department of Chemical Sciences
- Synthesis and Solid State Pharmaceutical Centre (SSPC) and Bernal Institute
- University of Limerick
- Limerick
- Ireland
| | - Andrea Salis
- Department of Chemical and Geological Sciences
- University of Cagliari
- CSGI & CNBS
- Cittadella Universitaria
- 09042 Monserrato (CA)
| | - Edmond Magner
- Department of Chemical Sciences
- Synthesis and Solid State Pharmaceutical Centre (SSPC) and Bernal Institute
- University of Limerick
- Limerick
- Ireland
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15
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Parsons DF, Salis A. A thermodynamic correction to the theory of competitive chemisorption of ions at surface sites with nonelectrostatic physisorption. J Chem Phys 2019; 151:024701. [DOI: 10.1063/1.5096237] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- Drew F. Parsons
- College of Science, Health, Engineering & Education, Murdoch University, 90 South St., Murdoch, WA 6150, Australia
| | - Andrea Salis
- Department of Chemical and Geological Sciences, University of Cagliari, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato, CA, Italy
- Consorzio Interuniversitario per lo Sviluppo dei Sistemi a Grande Interfase (CSGI), Unità Operativa Univ. Cagliari, Italy and Centro NanoBiotecnologie Sardegna (CNBS), Unità Operativa Univ. Cagliari,Italy
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16
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Gregory KP, Webber GB, Wanless EJ, Page AJ. Lewis Strength Determines Specific-Ion Effects in Aqueous and Nonaqueous Solvents. J Phys Chem A 2019; 123:6420-6429. [DOI: 10.1021/acs.jpca.9b04004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kasimir P. Gregory
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, New South Wales 2308, Australia
| | - Grant B. Webber
- School of Engineering, The University of Newcastle, Callaghan, New South Wales 2308, Australia
- Priority Research Centre for Advanced Particle Processing and Transport, The University of Newcastle, Callaghan, New South Wales 2308, Australia
| | - Erica J. Wanless
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, New South Wales 2308, Australia
- Priority Research Centre for Advanced Particle Processing and Transport, The University of Newcastle, Callaghan, New South Wales 2308, Australia
| | - Alister J. Page
- School of Environmental and Life Sciences, The University of Newcastle, Callaghan, New South Wales 2308, Australia
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17
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Liu G. Tuning the Properties of Charged Polymers at the Solid/Liquid Interface with Ions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:3232-3247. [PMID: 29806944 DOI: 10.1021/acs.langmuir.8b01158] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In conventional theories, where ions are treated as point charges, the properties of charged polymers can be tuned using ions via the ionic strength. However, this article will show that the properties of charged polymers at the solid/liquid interface, including charged polymer brushes and polyelectrolyte multilayers, can be tuned by ions beyond ionic strength effects. Ion specificity, multivalency, ionic hydrogen bonding, and ionic hydrophobicity/hydrophilicity are used to tune a range of properties of charged polymers at the solid/liquid interface such as hydration, conformation, stiffness, surface wettability, lubricity, adhesion, and protein adsorption. The ionic effects demonstrated here greatly broaden our understanding of the use of ions to tune the interfacial properties of charged polymers. It is anticipated that these ionic effects can be further expanded by incorporating new types of important ion-charged polymer interactions and can also be extended to neutral polymer systems.
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Affiliation(s)
- Guangming Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics , University of Science and Technology of China , Hefei , P. R. China 230026
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18
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Farooq U, Danish M, Lyu S, Brusseau ML, Gu M, Zaman WQ, Qiu Z, Sui Q. The impact of surface properties and dominant ions on the effectiveness of G-nZVI heterogeneous catalyst for environmental remediation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 651:1182-1188. [PMID: 30360250 PMCID: PMC6435274 DOI: 10.1016/j.scitotenv.2018.09.148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 09/10/2018] [Accepted: 09/11/2018] [Indexed: 05/14/2023]
Abstract
The surface properties of nanocomposites are influenced by the existence of inorganic species that may affect its performance for specific catalytic applications. The impact of different ionic species on particular catalytic activity had not been investigated to date. In this study, the surface charge (zeta potential) of graphene-oxide-supported nano zero valent iron (G-nZVI) was tested in definitive cationic (Na+, K+, Ca2+ and Mg2+) and anionic (Br-, Cl-, NO3-, SO42-, and HCO3-) environments. The efficiency of G-nZVI catalyst was inspected by measuring the generation of reactive oxygen species (ROS) for the degradation of 1,1,1-trichloroethane (TCA) in sodium percarbonate (SPC) system. Tests conducted using probe compounds confirmed the generation of OH and O2- radicals in the system. In addition, the experiments performed using scavenging agents certified that O2- were primary radicals responsible for TCA removal, along with prominent contribution from OH radicals. The study confirmed that G-nZVI catalytic capability for TCA degradation is notably affected by various cationic species. The presence of Ni2+ and Cu2+ significantly enhanced (94%), whereas Na+ and K+ had minor effects on TCA removal. Overall, the results indicated that groundwater ionic composition may have low impact on the effectiveness of G-nZVI-catalyzed peroxide TCA treatment.
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Affiliation(s)
- Usman Farooq
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200098, China
| | - Muhammad Danish
- Department of Chemical Engineering, University of Engineering and Technology, Lahore, Pakistan
| | - Shuguang Lyu
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200098, China.
| | - Mark L Brusseau
- Soil, Water and Environmental Science Department, School of Earth and Environmental Sciences, The University of Arizona, 429 Shantz Bldg., Tucson, AZ 85721, United States
| | - Mengbin Gu
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
| | - Waqas Qamar Zaman
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
| | - Zhaofu Qiu
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
| | - Qian Sui
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200098, China.
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19
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Zhu R, Baraniak MK, Jäkle F, Liu G. Anion Specificity in Dimethyl Sulfoxide-Water Mixtures Exemplified by a Thermosensitive Polymer. J Phys Chem B 2018; 122:8293-8300. [PMID: 30086631 DOI: 10.1021/acs.jpcb.8b06125] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
In the present work, we have investigated the anion-specific upper critical solution temperature (UCST) behavior of polymer-supported borinic acid (PBA) in dimethyl sulfoxide-water (DMSO-H2O) mixtures. An inverted V-shaped series CH3COO- < Cl- < salt-free > NO3- > ClO4- > SCN- is observed in terms of the anion-specific UCST of PBA in the DMSO-H2O mixtures. Both direct anion-polymer interactions and indirect solvent-mediated anion-polymer interactions are involved in the specific anion effect on the UCST behavior of PBA. The direct binding of anions to the PBA surface generates a salting-in effect on PBA, causing the UCST for the different types of anions to increase from chaotropic to kosmotropic anions due to the stronger binding of the more chaotropic anions. On the other hand, the indirect anionic polarization of hydrogen bonding between PBA and DMSO molecules also produces a salting-in effect on PBA, leading the UCST for the different types of anions to increase from kosmotropic to chaotropic anions because of the stronger capability of the more kosmotropic anions to polarize the hydrogen bonding. Thus, the dominating anion-PBA interactions change from the direct anion binding to the indirect anionic polarization of hydrogen bonding as the anions change from chaotropes to kosmotropes. The observed inverted V-shaped series suggests that the specific anion effect on the UCST behavior of PBA in the DMSO-H2O mixtures is determined by the combined effects of the binding of anions to the PBA surface and the anionic polarization of hydrogen bonding between PBA and DMSO molecules.
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Affiliation(s)
- Renwei Zhu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics , University of Science and Technology of China , Hefei , P. R. China 230026
| | - Monika K Baraniak
- Department of Chemistry , Rutgers University-Newark , 73 Warren Street , Newark , New Jersey 07102 , United States
| | - Frieder Jäkle
- Department of Chemistry , Rutgers University-Newark , 73 Warren Street , Newark , New Jersey 07102 , United States
| | - Guangming Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics , University of Science and Technology of China , Hefei , P. R. China 230026
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20
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Effect of Ionic Compounds of Different Valences on the Stability of Titanium Oxide Colloids. COLLOIDS AND INTERFACES 2018. [DOI: 10.3390/colloids2030032] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Titanium oxide particles of various morphologies have been prepared for applications of scientific or industrial interest in recent decades. Besides development of novel synthetic routes and solid-state characterization of the obtained particles, colloidal stability of titanium oxide dispersions was the focus of numerous research groups due to the high importance of this topic in applications in heterogeneous systems. The influence of dissolved ionic compounds, including monovalent salts, multivalent ions and polyelectrolytes, on the charging and aggregation behaviour of titanium oxide materials of spherical and elongated structures will be discussed in the present review.
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21
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Senske M, Constantinescu-Aruxandei D, Havenith M, Herrmann C, Weingärtner H, Ebbinghaus S. The temperature dependence of the Hofmeister series: thermodynamic fingerprints of cosolute-protein interactions. Phys Chem Chem Phys 2018; 18:29698-29708. [PMID: 27806138 DOI: 10.1039/c6cp05080h] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The Hofmeister series is a universal homologous series to rank ion-specific effects on biomolecular properties such as protein stability or aggregation propensity. Although this ranking is widely used, outliers and exceptions are discussed controversially and a molecular level understanding is still lacking. Studying the thermal unfolding equilibrium of RNase A, we here show that this ambiguity arises from the oversimplified approach to determine the ion rankings. Instead of measuring salt effects on a single point of the protein folding stability curve (e.g. the melting point Tm), we here consider the salt induced shifts of the entire protein 'stability curve' (the temperature dependence of the unfolding free energy change, ΔGu(T)). We found multiple intersections of these curves, pinpointing a widely ignored fact: the Hofmeister cation and anion rankings are temperature dependent. We further developed a novel classification scheme of cosolute effects based on their thermodynamic fingerprints, reaching beyond salt effects to non-electrolytes.
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Affiliation(s)
- Michael Senske
- Department of Physical Chemistry II, Ruhr-Universität Bochum, 44780 Bochum, Germany.
| | | | - Martina Havenith
- Department of Physical Chemistry II, Ruhr-Universität Bochum, 44780 Bochum, Germany.
| | - Christian Herrmann
- Department of Physical Chemistry I, Ruhr-Universität Bochum, 44780 Bochum, Germany.
| | - Hermann Weingärtner
- Department of Physical Chemistry II, Ruhr-Universität Bochum, 44780 Bochum, Germany.
| | - Simon Ebbinghaus
- Department of Physical Chemistry II, Ruhr-Universität Bochum, 44780 Bochum, Germany.
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22
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Senske M, Xu Y, Bäumer A, Schäfer S, Wirtz H, Savolainen J, Weingärtner H, Havenith M. Local chemistry of the surfactant's head groups determines protein stability in reverse micelles. Phys Chem Chem Phys 2018. [DOI: 10.1039/c8cp00407b] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Protein stability in reverse micelles is determined by local chemical interactions between the surfactant molecules and the protein groups.
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Affiliation(s)
- Michael Senske
- Department of Physical Chemistry II
- Ruhr-Universität Bochum
- 44780 Bochum
- Germany
| | - Yao Xu
- Department of Physical Chemistry II
- Ruhr-Universität Bochum
- 44780 Bochum
- Germany
| | - Alexander Bäumer
- Department of Physical Chemistry II
- Ruhr-Universität Bochum
- 44780 Bochum
- Germany
| | - Sarah Schäfer
- Department of Physical Chemistry II
- Ruhr-Universität Bochum
- 44780 Bochum
- Germany
| | - Hanna Wirtz
- Department of Physical Chemistry II
- Ruhr-Universität Bochum
- 44780 Bochum
- Germany
| | - Janne Savolainen
- Department of Physical Chemistry II
- Ruhr-Universität Bochum
- 44780 Bochum
- Germany
| | - Hermann Weingärtner
- Department of Physical Chemistry II
- Ruhr-Universität Bochum
- 44780 Bochum
- Germany
| | - Martina Havenith
- Department of Physical Chemistry II
- Ruhr-Universität Bochum
- 44780 Bochum
- Germany
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23
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Investigation of Hofmeister effects in ultra-dilute solutions at the water/silica interface using electrokinetic current generation. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.10.068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Ion specific hydration in nano-confined electrical double layers. J Colloid Interface Sci 2017; 506:263-270. [DOI: 10.1016/j.jcis.2017.07.039] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 07/11/2017] [Accepted: 07/13/2017] [Indexed: 11/15/2022]
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25
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Mazzini V, Craig VSJ. What is the fundamental ion-specific series for anions and cations? Ion specificity in standard partial molar volumes of electrolytes and electrostriction in water and non-aqueous solvents. Chem Sci 2017; 8:7052-7065. [PMID: 29147533 PMCID: PMC5637464 DOI: 10.1039/c7sc02691a] [Citation(s) in RCA: 81] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Accepted: 08/19/2017] [Indexed: 11/21/2022] Open
Abstract
The importance of electrolyte solutions cannot be overstated. Beyond the ionic strength of electrolyte solutions the specific nature of the ions present is vital in controlling a host of properties. Therefore ion specificity is fundamentally important in physical chemistry, engineering and biology. The observation that the strengths of the effect of ions often follows well established series suggests that a single predictive and quantitative description of specific-ion effects covering a wide range of systems is possible. Such a theory would revolutionise applications of physical chemistry from polymer precipitation to drug design. Current approaches to understanding specific-ion effects involve consideration of the ions themselves, the solvent and relevant interfaces and the interactions between them. Here we investigate the specific-ion effects trends of standard partial molar volumes and electrostrictive volumes of electrolytes in water and eleven non-aqueous solvents. We choose these measures as they relate to bulk properties at infinite dilution, therefore they are the simplest electrolyte systems. This is done to test the hypothesis that the ions alone exhibit a specific-ion effect series that is independent of the solvent and unrelated to surface properties. The specific-ion effects trends of standard partial molar volumes and normalised electrostrictive volumes examined in this work show a fundamental ion-specific series that is reproduced across the solvents, which is the Hofmeister series for anions and the reverse lyotropic series for cations, supporting the hypothesis. This outcome is important in demonstrating that ion specificity is observed at infinite dilution and demonstrates that the complexity observed in the manifestation of specific-ion effects in a very wide range of systems is due to perturbations of solvent, surfaces and concentration on the underlying fundamental series. This knowledge will guide a general understanding of specific-ion effects and assist in the development of a quantitative predictive theory of ion specificity.
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Affiliation(s)
- Virginia Mazzini
- Department of Applied Mathematics , Research School of Physics and Engineering , The Australian National University , Canberra , ACT 2601 , Australia .
| | - Vincent S J Craig
- Department of Applied Mathematics , Research School of Physics and Engineering , The Australian National University , Canberra , ACT 2601 , Australia .
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26
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Buffer formulation affects the interaction between lysozyme and polymeric nanoparticles. J Colloid Interface Sci 2017; 504:78-85. [DOI: 10.1016/j.jcis.2017.05.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 05/11/2017] [Accepted: 05/11/2017] [Indexed: 11/21/2022]
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27
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Diao Y, Han M, Lopez-Berganza JA, Valentino L, Marinas B, Espinosa-Marzal RM. Reconciling DLVO and non-DLVO Forces and Their Implications for Ion Rejection by a Polyamide Membrane. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:8982-8992. [PMID: 28771012 DOI: 10.1021/acs.langmuir.7b02306] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Recognizing the significance of surface interactions for ion rejection and membrane fouling in nanofiltration, we revise the theories of DLVO (named after Derjaguin, Landau, Verwey, and Overbeek) and non-DLVO forces in the context of polyamide active layers. Using an atomic force microscope, surface forces between polyamide active layers and a micrometer-large and smooth silica colloid were measured in electrolyte solutions of representative monovalent and divalent ions. While the analysis of DLVO forces, accounting for surface roughness, provides how surface charge of the active layer changes with electrolyte concentration, scrutiny of non-DLVO hydration forces gives molecular insight into the composition of the membrane-solution interface. Importantly, we report an expansion of the diffuse layer at high ionic strength, consistent with the recent development of the electrical double layer theory, but in contrast to the widely accepted phenomenon of aggregation in the secondary minimum. Further, the enhanced repulsion acting on modified membranes via polyelectrolyte adsorption can be quantitatively predicted by DLVO and non-DLVO forces. This work serves to solve past misunderstandings about the interaction forces acting on nanofiltration membranes, and it provides guidance for future work on the relation between surface properties and rejection mechanisms and fouling.
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Affiliation(s)
- Yijue Diao
- Civil and Environmental Engineering, University of Illinois at Urbana-Champaign , 205 North Matthews Avenue, Urbana, Illinois 61801, United States
| | - Mengwei Han
- Civil and Environmental Engineering, University of Illinois at Urbana-Champaign , 205 North Matthews Avenue, Urbana, Illinois 61801, United States
| | - Josue A Lopez-Berganza
- Civil and Environmental Engineering, University of Illinois at Urbana-Champaign , 205 North Matthews Avenue, Urbana, Illinois 61801, United States
| | - Lauren Valentino
- Civil and Environmental Engineering, University of Illinois at Urbana-Champaign , 205 North Matthews Avenue, Urbana, Illinois 61801, United States
| | - Benito Marinas
- Civil and Environmental Engineering, University of Illinois at Urbana-Champaign , 205 North Matthews Avenue, Urbana, Illinois 61801, United States
| | - Rosa M Espinosa-Marzal
- Civil and Environmental Engineering, University of Illinois at Urbana-Champaign , 205 North Matthews Avenue, Urbana, Illinois 61801, United States
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28
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Parsons DF, Duignan TT, Salis A. Cation effects on haemoglobin aggregation: balance of chemisorption against physisorption of ions. Interface Focus 2017. [PMID: 28630674 DOI: 10.1098/rsfs.2016.0137] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
A theoretical model of haemoglobin is presented to explain an anomalous cationic Hofmeister effect observed in protein aggregation. The model quantifies competing proposed mechanisms of non-electrostatic physisorption and chemisorption. Non-electrostatic physisorption is stronger for larger, more polarizable ions with a Hofmeister series Li+< K+< Cs+. Chemisorption at carboxylate groups is stronger for smaller kosmotropic ions, with the reverse series Li+ > K+ > Cs+. We assess aggregation using second virial coefficients calculated from theoretical protein-protein interaction energies. Taking Cs+ to not chemisorb, comparison with experiment yields mildly repulsive cation-carboxylate binding energies of 0.48 kBT for Li+ and 3.0 kBT for K+. Aggregation behaviour is predominantly controlled by short-range protein interactions. Overall, adsorption of the K+ ion in the middle of the Hofmeister series is stronger than ions at either extreme since it includes contributions from both physisorption and chemisorption. This results in stronger attractive forces and greater aggregation with K+, leading to the non-conventional Hofmeister series K+ > Cs+ ≈ Li+.
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Affiliation(s)
- Drew F Parsons
- School of Engineering and Information Technology, Murdoch University, 90 South Street, Murdoch, Western Australia 6150, Australia
| | - Timothy T Duignan
- Physical Science Division, Pacific Northwest National Laboratory, PO Box 999, Richland, WA 99352, USA
| | - Andrea Salis
- Department of Chemical and Geological Sciences, University of Cagliari-CSGI and CNBS Cittadella Universitaria, S.S. 554 bivio Sestu, 09042 Monserrato (CA), Italy
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29
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Cugia F, Sedda S, Pitzalis F, Parsons DF, Monduzzi M, Salis A. Are specific buffer effects the new frontier of Hofmeister phenomena? Insights from lysozyme adsorption on ordered mesoporous silica. RSC Adv 2016. [DOI: 10.1039/c6ra17356j] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Different 10 mM buffers at the same nominal pH affect specifically the adsorption of lysozyme on ordered mesoporous silica. It emerges that specific buffer effects should be considered within ‘Hofmeister phenomena’.
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Affiliation(s)
- Francesca Cugia
- Department of Chemical and Geological Sciences
- University of Cagliari-CSGI and CNBS
- Cittadella Universitaria
- 09042-Monserrato
- Italy
| | - Silvia Sedda
- Department of Chemical and Geological Sciences
- University of Cagliari-CSGI and CNBS
- Cittadella Universitaria
- 09042-Monserrato
- Italy
| | - Federica Pitzalis
- Department of Chemical and Geological Sciences
- University of Cagliari-CSGI and CNBS
- Cittadella Universitaria
- 09042-Monserrato
- Italy
| | - Drew F. Parsons
- School of Engineering and Information Technology
- Murdoch University
- Australia
| | - Maura Monduzzi
- Department of Chemical and Geological Sciences
- University of Cagliari-CSGI and CNBS
- Cittadella Universitaria
- 09042-Monserrato
- Italy
| | - Andrea Salis
- Department of Chemical and Geological Sciences
- University of Cagliari-CSGI and CNBS
- Cittadella Universitaria
- 09042-Monserrato
- Italy
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