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Nemadodzi LE, Managa GM. 1H NMR-Based Metabolomics Profile of Green and Red Amaranthus Grown in Open Field versus Greenhouse Cultivation System. Metabolites 2023; 14:21. [PMID: 38248824 PMCID: PMC10819972 DOI: 10.3390/metabo14010021] [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: 11/25/2023] [Revised: 12/24/2023] [Accepted: 12/26/2023] [Indexed: 01/23/2024] Open
Abstract
Traditionally, indigenous African leafy vegetables such as Amaranthus, blackjack, jute mallow, cleome monophyla, and spider plants have been conventionally and organically grown as weeds in open fields. However, the lack of land space due to the increase in population has resulted in unconventional, modern, and advanced agricultural farming. The introduction of a greenhouse has recently become the second most popular growing system alongside shade net and glasshouse to increase productivity and meet consumers' demand. Several studies on Amaranthus species have solely focused on physiological parameters and nutritional composition, leaving a huge gap on their metabolomic profile of the leaves which is crucial to comprehend when growing Amaranthus species in different cropping systems. Therefore, the study aimed to determine the influence of different cropping systems on the release of metabolites of two commonly consumed Amaranthus species in South Africa. H1 -Nuclear Magnetic Resonance (NMR) tool was used to profile the untargeted metabolites of green (Amaranthus graecizans L.) and red (Amaranthus cruentus L.) species. A total of 12 metabolites-trehalose, betaine, glutamine, choline, sucrose, caprate, adenosine, asparagine, carnitine, caffeine, aspartate, and alanine-were detected in green amaranth grown in open fields. Except for caffeine, aspartate, and caprate, which were found in the green amaranth grown in open fields, all the other metabolites were detected in the greenhouse grown once. Interestingly, allantoin, which serves as an allelochemical, was the sole distinct metabolite detected in greenhouse cultivated green amaranth. On the contrary, seven similar metabolites were quantified in red amaranth grown in both open fields and greenhouses, apart from caffeine, which was only detected in greenhouse-cultivated red amaranth.
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Affiliation(s)
- Lufuno Ethel Nemadodzi
- Department of Agriculture and Animal Health, University of South Africa, Johannesburg 1709, South Africa
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2
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Krevert CS, Gunkel L, Haese C, Hunger J. Ion-specific binding of cations to the carboxylate and of anions to the amide of alanylalanine. Commun Chem 2022; 5:173. [PMID: 36697920 PMCID: PMC9814750 DOI: 10.1038/s42004-022-00789-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Accepted: 11/30/2022] [Indexed: 12/24/2022] Open
Abstract
Studies of ion-specific effects on oligopeptides have aided our understanding of Hofmeister effects on proteins, yet the use of different model peptides and different experimental sensitivities have led to conflicting conclusions. To resolve these controversies, we study a small model peptide, L-Alanyl-L-alanine (2Ala), carrying all fundamental chemical protein motifs: C-terminus, amide bond, and N-terminus. We elucidate the effect of GdmCl, LiCl, KCl, KI, and KSCN by combining dielectric relaxation, nuclear magnetic resonance (1H-NMR), and (two-dimensional) infrared spectroscopy. Our dielectric results show that all ions reduce the rotational mobility of 2Ala, yet the magnitude of the reduction is larger for denaturing cations than for anions. The NMR chemical shifts of the amide group are particularly sensitive to denaturing anions, indicative of anion-amide interactions. Infrared experiments reveal that LiCl alters the spectral homogeneity and dynamics of the carboxylate, but not the amide group. Interaction of LiCl with the negatively charged pole of 2Ala, the COO- group, can explain the marked cationic effect on dipolar rotation, while interaction of anions between the poles, at the amide, only weakly perturbs dipolar dynamics. As such, our results provide a unifying view on ions' preferential interaction sites at 2Ala and help rationalize Hofmeister effects on proteins.
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Affiliation(s)
- Carola Sophie Krevert
- grid.419547.a0000 0001 1010 1663Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Lucas Gunkel
- grid.419547.a0000 0001 1010 1663Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Constantin Haese
- grid.419547.a0000 0001 1010 1663Department of Molecular Electronics, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Johannes Hunger
- grid.419547.a0000 0001 1010 1663Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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3
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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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4
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Adachi T, Tsujimura S. Effects of electrolyte on the mediated electrocatalytic glucose oxidation reaction catalyzed by flavin adenine dinucleotide glucose dehydrogenase. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.04.145] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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5
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Krickl S, Touraud D, Bauduin P, Zinn T, Kunz W. Enzyme activity of horseradish peroxidase in surfactant-free microemulsions. J Colloid Interface Sci 2018; 516:466-475. [DOI: 10.1016/j.jcis.2018.01.077] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 01/22/2018] [Accepted: 01/22/2018] [Indexed: 11/28/2022]
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6
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Cuccovia IM, da Silva Lima F, Chaimovich H. Counting ions and other nucleophiles at surfaces by chemical trapping. Biophys Rev 2017; 9:617-631. [PMID: 28852984 PMCID: PMC5662041 DOI: 10.1007/s12551-017-0299-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Accepted: 07/27/2017] [Indexed: 12/30/2022] Open
Abstract
The interfaces of membranes and other aggregates are determined by the polarity, electrical charge, molecular volume, degrees of motional freedom and packing density of the head groups of the amphiphiles. These properties also determine the type of bound ion (ion selectivity) and its local density, i.e. concentration defined by choosing an appropriate volume element at the aggregate interface. Bulk and local ion concentrations can differ by orders of magnitude. The relationships between ion (or other compound) concentrations in the bulk solvent and in the interface are complex but, in some cases, well established. As the local ion concentration, rather than that in the bulk, controls a variety of properties of membranes, micelles, vesicles and other objects of theoretical and applied interests, measurement of local (interfacial, bound) ion concentrations is of relevance for understanding and characterizing such aggregates. Many experimental methods for estimating ion distributions between the bulk solution and the interface provide indirect estimates because they are based on concentration-dependent properties, rather than concentration measurements. Dediazoniation, i.e. the loss of N2, of a substituted diazophenyl derivative provides a tool for determining the number of nucleophiles (including neutral or negatively charged ions) surrounding the diazophenyl derivative prior to the dediazoniation event. This reaction, defined as chemical trapping, and the appropriate reference points obtained in bulk solution allow direct measurements of local concentrations of a variety of nucleophiles at the surface of membranes and other aggregates. Here we review our contributions of our research group to the use, and understanding, of this method and applications of chemical trapping to the description of local concentrations of ions and other nucleophiles in micelles, reverse micelles, vesicles and solvent mixtures. Among other results, we have shown that interfacial water determines micellar shape, zwitterionic vesicle-forming amphiphiles display ion selectivity and urea does not accumulate at micellar interfaces. We have also shown that reaction products can be predicted from the composition of the initial state, even in non-ideal solvent mixtures, supporting the usefulness of chemical trapping as a method to determine local concentrations. In addition, we have analysed the mechanism of dediazoniation, both on theoretical and experimental basis, and concluded that the formation of a free phenyl cation is not a necessary part of the reaction pathway.
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Affiliation(s)
- Iolanda Midea Cuccovia
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil.
| | - Filipe da Silva Lima
- Departamento de Química Fundamental, Centro de Ciências Exatas e da Natureza, Universidade Federal de Pernambuco, Recife, Brazil
| | - Hernan Chaimovich
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
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Gaiduk AP, Galli G. Local and Global Effects of Dissolved Sodium Chloride on the Structure of Water. J Phys Chem Lett 2017; 8:1496-1502. [PMID: 28267335 DOI: 10.1021/acs.jpclett.7b00239] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Determining how the structure of water is modified by the presence of salts is instrumental to understanding the solvation of biomolecules and, in general, the role played by salts in biochemical processes. However, the extent of hydrogen bonding disruption induced by salts remains controversial. We performed extensive first-principles simulations of solutions of a simple salt (NaCl) and found that, while the cation does not significantly change the structure of water beyond the first solvation shell, the anion has a further reaching effect, modifying the hydrogen-bond network even outside its second solvation shell. We found that a distinctive fingerprint of hydrogen bonding modification is the change in polarizability of water molecules. Molecular dipole moments are instead insensitive probes of long-range modifications induced by Na+ and Cl- ions. Though noticeable, the long-range effect of Cl- is expected to be too weak to affect solubility of large biomolecules.
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Affiliation(s)
- Alex P Gaiduk
- Institute for Molecular Engineering, The University of Chicago , Chicago, Illinois 60637, United States
| | - Giulia Galli
- Institute for Molecular Engineering, The University of Chicago , Chicago, Illinois 60637, United States
- Materials Science Division, Argonne National Laboratory , Argonne, Illinois 60439, United States
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8
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Johnson NO, Light TP, MacDonald G, Zhang Y. Anion–Caffeine Interactions Studied by 13C and 1H NMR and ATR–FTIR Spectroscopy. J Phys Chem B 2017; 121:1649-1659. [DOI: 10.1021/acs.jpcb.6b12150] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Nicolas O. Johnson
- Department of Chemistry and
Biochemistry, James Madison University, Harrisonburg, Virginia 22807, United States
| | - Taylor P. Light
- Department of Chemistry and
Biochemistry, James Madison University, Harrisonburg, Virginia 22807, United States
| | - Gina MacDonald
- Department of Chemistry and
Biochemistry, James Madison University, Harrisonburg, Virginia 22807, United States
| | - Yanjie Zhang
- Department of Chemistry and
Biochemistry, James Madison University, Harrisonburg, Virginia 22807, United States
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Zhao L, Pan L, Cao Z, Wang Q. Mutual Effects of Glycerol and Inorganic Salts on Their Hydration Abilities. J Phys Chem B 2016; 120:13112-13117. [DOI: 10.1021/acs.jpcb.6b08778] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lishan Zhao
- Department
of Physics, University of Science and Technology Beijing, Beijing 100083, China
- Institute
of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Liqing Pan
- Department
of Physics, University of Science and Technology Beijing, Beijing 100083, China
| | - Zexian Cao
- Institute
of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Qiang Wang
- Institute
of Physics, Chinese Academy of Sciences, Beijing 100190, China
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10
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11
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Enzymatic deglycosylation of flavonoids in deep eutectic solvents-aqueous mixtures: paving the way for sustainable flavonoid chemistry. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcatb.2016.04.010] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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12
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Novel Applications of Non Hofmeister Ion Specificity in Bubble Interactions. Curr Opin Colloid Interface Sci 2016. [DOI: 10.1016/j.cocis.2016.06.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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13
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Salis A, Monduzzi M. Not only pH. Specific buffer effects in biological systems. Curr Opin Colloid Interface Sci 2016. [DOI: 10.1016/j.cocis.2016.04.004] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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14
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He Z, Xie WJ, Liu Z, Liu G, Wang Z, Gao YQ, Wang J. Tuning ice nucleation with counterions on polyelectrolyte brush surfaces. SCIENCE ADVANCES 2016; 2:e1600345. [PMID: 27386581 PMCID: PMC4928907 DOI: 10.1126/sciadv.1600345] [Citation(s) in RCA: 89] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Accepted: 05/12/2016] [Indexed: 05/19/2023]
Abstract
Heterogeneous ice nucleation (HIN) on ionic surfaces is ubiquitous in a wide range of atmospheric aerosols and at biological interfaces. Despite its great importance in cirrus cloud formation and cryopreservation of cells, organs, and tissues, it remains unclear whether the ion-specific effect on ice nucleation exists. Benefiting from the fact that ions at the polyelectrolyte brush (PB)/water interface can be reversibly exchanged, we report the effect of ions on HIN on the PB surface, and we discover that the distinct efficiency of ions in tuning HIN follows the Hofmeister series. Moreover, a large HIN temperature window of up to 7.8°C is demonstrated. By establishing a correlation between the fraction of ice-like water molecules and the kinetics of structural transformation from liquid- to ice-like water molecules at the PB/water interface with different counterions, we show that our molecular dynamics simulation analysis is consistent with the experimental observation of the ion-specific effect on HIN.
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Affiliation(s)
- Zhiyuan He
- Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Wen Jun Xie
- Beijing National Laboratory for Molecular Sciences, Institute of Theoretical and Computational Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Zhenqi Liu
- Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Guangming Liu
- Department of Chemical Physics, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China
| | - Zuowei Wang
- School of Mathematical and Physical Sciences, University of Reading, Whiteknights, Reading RG6 6AX, UK
| | - Yi Qin Gao
- Beijing National Laboratory for Molecular Sciences, Institute of Theoretical and Computational Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
- Corresponding author. (J.W.); (Y.Q.G.)
| | - Jianjun Wang
- Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- Corresponding author. (J.W.); (Y.Q.G.)
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15
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Parsons DF, Salis A. The impact of the competitive adsorption of ions at surface sites on surface free energies and surface forces. J Chem Phys 2015; 142:134707. [DOI: 10.1063/1.4916519] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Drew F. Parsons
- School of Engineering and Information Technology, Murdoch University, 90 South St, Murdoch, WA 6150, Australia
- Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia
| | - Andrea Salis
- Department of Applied Mathematics, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia
- 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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16
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Carucci C, Haltenort P, Salazar M, Salis A, Magner E. Hofmeister Phenomena in Bioelectrochemistry: The Supporting Electrolyte Affects the Response of Glucose Electrodes. ChemElectroChem 2015. [DOI: 10.1002/celc.201402412] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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King JD, Liu H, He G, Orf GS, Blankenship RE. Chemical activation of the cyanobacterial orange carotenoid protein. FEBS Lett 2014; 588:4561-5. [DOI: 10.1016/j.febslet.2014.10.024] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Revised: 10/20/2014] [Accepted: 10/22/2014] [Indexed: 11/29/2022]
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18
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Salis A, Ninham BW. Models and mechanisms of Hofmeister effects in electrolyte solutions, and colloid and protein systems revisited. Chem Soc Rev 2014; 43:7358-77. [PMID: 25099516 DOI: 10.1039/c4cs00144c] [Citation(s) in RCA: 365] [Impact Index Per Article: 36.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Specific effects of electrolytes have posed a challenge since the 1880's. The pioneering work was that of Franz Hofmeister who studied specific salt induced protein precipitation. These effects are the rule rather the exception and are ubiquitous in chemistry and biology. Conventional electrostatic theories (Debye-Hückel, DLVO, etc.) cannot explain such effects. Over the past decades it has been recognised that additional quantum mechanical dispersion forces with associated hydration effects acting on ions are missing from theory. In parallel Collins has proposed a phenomenological set of rules (the law of matching water affinities, LMWA) which explain and bring to order the order of ion-ion and ion-surface site interactions at a qualitative level. The two approaches appear to conflict. Although the need for inclusion of quantum dispersion forces in one form or another is not questioned, the modelling has often been misleading and inappropriate. It does not properly describe the chemical nature (kosmotropic/chaotropic or hard/soft) of the interacting species. The success of the LMWA rules lies in the fact that they do. Here we point to the way that the two apparently opposing approaches might be reconciled. Notwithstanding, there are more challenges, which deal with the effect of dissolved gas and its connection to 'hydrophobic' interactions, the problem of water at different temperatures and 'water structure' in the presence of solutes. They take us to another dimension that requires the rebuilding of theoretical foundations.
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Affiliation(s)
- Andrea Salis
- Department of Chemical and Geological Science, University of Cagliari, Italy and CSGI.
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19
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Fameau AL, Zemb T. Self-assembly of fatty acids in the presence of amines and cationic components. Adv Colloid Interface Sci 2014; 207:43-64. [PMID: 24345730 DOI: 10.1016/j.cis.2013.11.017] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 11/18/2013] [Accepted: 11/21/2013] [Indexed: 11/27/2022]
Abstract
Fatty acids can self-assemble under various shapes in the presence of amines or cationic components. We assemble and compare these types of self-assembly leading toward a catanionic system either with a cationic surfactant or with an amine component playing the role of counter-ion. First, we focus on the molar ratio as a key driving parameter. Known and yet un-known values from other quantities governing the colloidal properties of these systems such as structural surface charge, osmotic pressure, molecular segregation, rigidity, in plane colloidal interactions and melting transition are discussed. We include also recent results obtained on the interfacial and foaming properties of these systems. We will highlight the specificity of these self-assemblies leading to unusual macroscopic properties rich of robust applications.
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20
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Zhang R, Zhuang W. Cation effect in the ionic solution optical Kerr effect measurements: A simulation study. J Chem Phys 2014; 140:054507. [PMID: 24511952 DOI: 10.1063/1.4863696] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Ruiting Zhang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, People's Republic of China
| | - Wei Zhuang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, People's Republic of China
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21
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Lutter JC, Wu TY, Zhang Y. Hydration of Cations: A Key to Understanding of Specific Cation Effects on Aggregation Behaviors of PEO-PPO-PEO Triblock Copolymers. J Phys Chem B 2013; 117:10132-41. [DOI: 10.1021/jp405709x] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jacob C. Lutter
- Department of Chemistry and
Biochemistry, James Madison University, Harrisonburg, Virginia 22807, United States
| | - Tsung-yu Wu
- Department of Chemistry and
Biochemistry, James Madison University, Harrisonburg, Virginia 22807, United States
| | - Yanjie Zhang
- Department of Chemistry and
Biochemistry, James Madison University, Harrisonburg, Virginia 22807, United States
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22
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Xue L, Zhao Y, Yu L, Sun Y, Yan K, Li Y, Huang X, Qu Y. Choline acetate enhanced the catalytic performance of Candida rogusa lipase in AOT reverse micelles. Colloids Surf B Biointerfaces 2013; 105:81-6. [DOI: 10.1016/j.colsurfb.2012.12.050] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2012] [Revised: 12/20/2012] [Accepted: 12/21/2012] [Indexed: 10/27/2022]
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23
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Müller W, Déjugnat C, Zemb T, Dufrêche JF, Diat O. How Do Anions Affect Self-Assembly and Solubility of Cetylpyridinium Surfactants in Water. J Phys Chem B 2013; 117:1345-56. [DOI: 10.1021/jp3093622] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Wolfram Müller
- Institut de Chimie Séparative
de Marcoule (ICSM),
UMR 5257 (CEA/CNRS/UM2/ENSCM), Bagnols-sur-Cèze, France
| | - Christophe Déjugnat
- Institut de Chimie Séparative
de Marcoule (ICSM),
UMR 5257 (CEA/CNRS/UM2/ENSCM), Bagnols-sur-Cèze, France
| | - Thomas Zemb
- Institut de Chimie Séparative
de Marcoule (ICSM),
UMR 5257 (CEA/CNRS/UM2/ENSCM), Bagnols-sur-Cèze, France
| | - Jean-François Dufrêche
- Institut de Chimie Séparative
de Marcoule (ICSM),
UMR 5257 (CEA/CNRS/UM2/ENSCM), Bagnols-sur-Cèze, France
| | - Olivier Diat
- Institut de Chimie Séparative
de Marcoule (ICSM),
UMR 5257 (CEA/CNRS/UM2/ENSCM), Bagnols-sur-Cèze, France
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24
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Medda L, Barse B, Cugia F, Boström M, Parsons DF, Ninham BW, Monduzzi M, Salis A. Hofmeister challenges: ion binding and charge of the BSA protein as explicit examples. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:16355-63. [PMID: 23126573 DOI: 10.1021/la3035984] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Experiments on bovine serum albumin (BSA) via potentiometric titration (PT) and electrophoretic light scattering (ELS) are used to study specific-ion binding. The effect is appreciable at a physiological concentration of 0.1 M. We found that anions bind to the protein surface at an acidic pH, where the protein carries a positive charge (Z(p) > 0), according to a Hofmeister series (Cl(-) < Br(-) < NO(3)(-) < I(-) < SCN(-)), as well as at the isoionic point (Z(p) = 0). The results obtained require critical interpretation. The measurements performed depend on electrostatic theories that ignore the very specific effects they are supposed to reveal. Notwithstanding this difficulty, we can still infer that different 1:1 sodium salts affect the BSA surface charge/pH curve because anions bind to the BSA surface with an efficiency which follows a Hofmeister series.
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Affiliation(s)
- Luca Medda
- 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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25
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Maiti S, Das K, Dutta S, Das PK. Striking Improvement in Peroxidase Activity of Cytochrome c by Modulating Hydrophobicity of Surface-Functionalized Gold Nanoparticles within Cationic Reverse Micelles. Chemistry 2012; 18:15021-30. [DOI: 10.1002/chem.201202398] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Indexed: 01/07/2023]
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26
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Enami S, Mishra H, Hoffmann MR, Colussi AJ. Hofmeister effects in micromolar electrolyte solutions. J Chem Phys 2012; 136:154707. [PMID: 22519343 DOI: 10.1063/1.4704752] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Affiliation(s)
- Shinichi Enami
- The Hakubi Center, Kyoto University, Kyoto 606-8302, Japan.
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27
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Kim H, Lee H, Lee G, Kim H, Cho M. Hofmeister anionic effects on hydration electric fields around water and peptide. J Chem Phys 2012; 136:124501. [DOI: 10.1063/1.3694036] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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Lo Nostro P, Ninham BW. Hofmeister phenomena: an update on ion specificity in biology. Chem Rev 2012; 112:2286-322. [PMID: 22251403 DOI: 10.1021/cr200271j] [Citation(s) in RCA: 659] [Impact Index Per Article: 54.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Pierandrea Lo Nostro
- Department of Chemistry and CSGI, University of Florence, 50019 Sesto Fiorentino (Firenze), Italy.
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29
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Kim H, Park S, Cho M. Rotational dynamics of thiocyanate ions in highly concentrated aqueous solutions. Phys Chem Chem Phys 2012; 14:6233-40. [DOI: 10.1039/c2cp23749k] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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30
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Ghosh M, Maiti S, Brahmachari S, Das PK. GNP confinement at the interface of cationic reverse micelles: influence in improving the lipase activity. RSC Adv 2012. [DOI: 10.1039/c2ra21237d] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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31
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Medda L, Salis A, Magner E. Specific ion effects on the electrochemical properties of cytochrome c. Phys Chem Chem Phys 2012; 14:2875-83. [DOI: 10.1039/c2cp23401g] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Salis A, Boström M, Medda L, Cugia F, Barse B, Parsons DF, Ninham BW, Monduzzi M. Measurements and theoretical interpretation of points of zero charge/potential of BSA protein. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:11597-11604. [PMID: 21834579 DOI: 10.1021/la2024605] [Citation(s) in RCA: 168] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The points of zero charge/potential of proteins depend not only on pH but also on how they are measured. They depend also on background salt solution type and concentration. The protein isoelectric point (IEP) is determined by electrokinetical measurements, whereas the isoionic point (IIP) is determined by potentiometric titrations. Here we use potentiometric titration and zeta potential (ζ) measurements at different NaCl concentrations to study systematically the effect of ionic strength on the IEP and IIP of bovine serum albumin (BSA) aqueous solutions. It is found that high ionic strengths produce a shift of both points toward lower (IEP) and higher (IIP) pH values. This result was already reported more than 60 years ago. At that time, the only available theory was the purely electrostatic Debye-Hückel theory. It was not able to predict the opposite trends of IIP and IEP with ionic strength increase. Here, we extend that theory to admit both electrostatic and nonelectrostatic (NES) dispersion interactions. The use of a modified Poisson-Boltzmann equation for a simple model system (a charge regulated spherical colloidal particle in NaCl salt solutions), that includes these ion specific interactions, allows us to explain the opposite trends observed for isoelectric point (zero zeta potential) and isoionic point (zero protein charge) of BSA. At higher concentrations, an excess of the anion (with stronger NES interactions than the cation) is adsorbed at the surface due to an attractive ionic NES potential. This makes the potential relatively more negative. Consequently, the IEP is pushed toward lower pH. But the charge regulation condition means that the surface charge becomes relatively more positive as the surface potential becomes more negative. Consequently, the IIP (measuring charge) shifts toward higher pH as concentration increases, in the opposite direction from the IEP (measuring potential).
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Affiliation(s)
- Andrea Salis
- Department of Chemical Science, University of Cagliari-CSGI and CNBS, Cittadella Universitaria, S.S. 554 bivio Sestu, 09042- Monserrato (CA), Italy.
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33
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Deyerle BA, Zhang Y. Effects of Hofmeister anions on the aggregation behavior of PEO-PPO-PEO triblock copolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:9203-10. [PMID: 21688819 DOI: 10.1021/la201463g] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The effects of a series of Hofmeister anions on the phase behaviors of a poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide) (PEO-PPO-PEO) triblock copolymer were investigated with an automated melting point system. Well hydrated anions and poorly hydrated anions interacted with the polymer differently and further affected the phase transition of the polymer. Poorly hydrated anions worked through changing the interfacial tension at the polymer/aqueous interface and in enhancing the polymer hydration by ion binding. The phase transition of the polymer in the presence of well hydrated anions correlated directly to the hydration entropy of the anions. As a consequence, the polymer showed a two-step phase transition in solutions containing poorly hydrated anions while displayed a single-step phase transition in the presence of well hydrated anions. The mechanisms of how ions interact with the polymer and further modulate its phase behaviors were discussed.
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Affiliation(s)
- Branden A Deyerle
- Department of Chemistry and Biochemistry, James Madison University, Harrisonburg, Virginia 22807, USA
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34
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Lee KK, Park KH, Kwon D, Choi JH, Son H, Park S, Cho M. Ion-pairing dynamics of Li+ and SCN− in dimethylformamide solution: Chemical exchange two-dimensional infrared spectroscopy. J Chem Phys 2011; 134:064506. [DOI: 10.1063/1.3552961] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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35
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Backes C, Schunk T, Hauke F, Hirsch A. Counterion effect on the aggregation of anionic perylene dyes and the influence on carbon nanotube dispersion efficiencies. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm02505d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Murgia S, Palazzo G, Mamusa M, Lampis S, Monduzzi M. Aerosol-OT in water forms fully-branched cylindrical direct micelles in the presence of the ionic liquid 1-butyl-3-methylimidazolium bromide. Phys Chem Chem Phys 2011; 13:9238-45. [DOI: 10.1039/c1cp20209j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Park K, Choi SR, Choi J, Park S, Cho M. Real‐Time Probing of Ion Pairing Dynamics with 2DIR Spectroscopy. Chemphyschem 2010; 11:3632-7. [DOI: 10.1002/cphc.201000595] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Kwang‐Hee Park
- Department of Chemistry, Korea University, Seoul 136‐701 (Korea), Fax: (+82) 2‐3290‐3121
| | - Seung Ryul Choi
- Department of Chemistry, Korea University, Seoul 136‐701 (Korea), Fax: (+82) 2‐3290‐3121
| | - Jun‐Ho Choi
- Department of Chemistry, Korea University, Seoul 136‐701 (Korea), Fax: (+82) 2‐3290‐3121
| | - Sungnam Park
- Department of Chemistry, Korea University, Seoul 136‐701 (Korea), Fax: (+82) 2‐3290‐3121
- Multidimensional Spectroscopy Laboratory, Korea Basic Science Institute, Seoul 136‐713 (Korea)
| | - Minhaeng Cho
- Department of Chemistry, Korea University, Seoul 136‐701 (Korea), Fax: (+82) 2‐3290‐3121
- Multidimensional Spectroscopy Laboratory, Korea Basic Science Institute, Seoul 136‐713 (Korea)
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38
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Chen X, Flores SC, Lim SM, Zhang Y, Yang T, Kherb J, Cremer PS. Specific anion effects on water structure adjacent to protein monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:16447-16454. [PMID: 20560589 DOI: 10.1021/la1015862] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Vibrational sum frequency spectroscopy (VSFS) was used to explore specific ion effects on interfacial water structure adjacent to a bovine serum albumin (BSA) monolayer adsorbed at the air/water interface. The subphase conditions were varied by the use of six different sodium salts and four different pH values. At pH 2 and 3, the protein layer was positively charged and it was found that the most chaotropic anions caused the greatest attenuation of water structure. The order of the salts followed an inverse Hofmeister series. On the other hand, when the protein layer was near its isoelectric point (pH 5), the most chaotropic anions caused the greatest increase in water structure, although the effect was weak. In this case, a direct Hofmeister series was obeyed. Finally, virtually no effect was observed when the protein layer was negatively charged with a subphase pH of 9. For comparison, similar experiments were run with positively charged, negatively charged, and zwitterionic surfactant monolayers. These experiments gave rise to nearly the identical results as the protein monolayer which suggested that specific anion effects are dominated by the charge state of the interfacial layer rather than its detailed chemical structure. In a final set of experiments, salt effects were examined with a monolayer made from an elastin-like polypeptide (ELP). The peptide consisted of 120 pentameric repeats of the sequence Val-Pro-Gly-Val-Gly. Data from this net neutral biopolymer followed a very weak, but direct Hofmeister series. This suggested that direct anion binding to the amide groups in the backbone of a polypeptide is quite weak in agreement with the BSA data. The results from the variously charged protein, surfactant, and polymer monolayers were compared with a modified Gouy-Chapman-Stern model. The agreement with this simple model was quite good.
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Affiliation(s)
- Xin Chen
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
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39
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Heyda J, Lund M, Ončák M, Slavíček P, Jungwirth P. Reversal of Hofmeister Ordering for Pairing of NH4+ vs Alkylated Ammonium Cations with Halide Anions in Water. J Phys Chem B 2010; 114:10843-52. [DOI: 10.1021/jp101393k] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Jan Heyda
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, and Center for Biomolecules and Complex Molecular Systems, Flemingovo nám. 2, 16610 Prague 6, Czech Republic, Department of Theoretical Chemistry, Lund University, P.O. Box 124, SE-22100 Lund, Sweden, and Department of Physical Chemistry, Institute of Chemical Technology, Technická 5, Prague 6, Czech Republic
| | - Mikael Lund
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, and Center for Biomolecules and Complex Molecular Systems, Flemingovo nám. 2, 16610 Prague 6, Czech Republic, Department of Theoretical Chemistry, Lund University, P.O. Box 124, SE-22100 Lund, Sweden, and Department of Physical Chemistry, Institute of Chemical Technology, Technická 5, Prague 6, Czech Republic
| | - Milan Ončák
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, and Center for Biomolecules and Complex Molecular Systems, Flemingovo nám. 2, 16610 Prague 6, Czech Republic, Department of Theoretical Chemistry, Lund University, P.O. Box 124, SE-22100 Lund, Sweden, and Department of Physical Chemistry, Institute of Chemical Technology, Technická 5, Prague 6, Czech Republic
| | - Petr Slavíček
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, and Center for Biomolecules and Complex Molecular Systems, Flemingovo nám. 2, 16610 Prague 6, Czech Republic, Department of Theoretical Chemistry, Lund University, P.O. Box 124, SE-22100 Lund, Sweden, and Department of Physical Chemistry, Institute of Chemical Technology, Technická 5, Prague 6, Czech Republic
| | - Pavel Jungwirth
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, and Center for Biomolecules and Complex Molecular Systems, Flemingovo nám. 2, 16610 Prague 6, Czech Republic, Department of Theoretical Chemistry, Lund University, P.O. Box 124, SE-22100 Lund, Sweden, and Department of Physical Chemistry, Institute of Chemical Technology, Technická 5, Prague 6, Czech Republic
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40
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Rosenlehner K, Schade B, Böttcher C, Jäger C, Clark T, Heinemann F, Hirsch A. Sodium Effect on Self-Organization of Amphiphilic Carboxylates: Formation of Structured Micelles and Superlattices. Chemistry 2010; 16:9544-54. [DOI: 10.1002/chem.201001150] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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41
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Abstract
The study of the interactions of salts and osmolytes with macromolecules in aqueous solution originated with experiments concerning protein precipitation more than 100 years ago. Today, these solutes are known to display recurring behavior for myriad biological and chemical processes. Such behavior depends both on the nature and concentration of the species in solution. Despite the generality of these effects, our understanding of the molecular-level details of ion and osmolyte specificity is still quite limited. Here, we review recent studies of the interactions between anions and urea with model macromolecular systems. A mechanism for specific ion effects is elucidated for aqueous systems containing charged and uncharged polymers, polypeptides, and proteins. The results clearly show that the effects of the anions are local and involve direct interactions with macromolecules and their first hydration shell. Also, a hydrogen-bonding mechanism is tested for the urea denaturation of proteins with some of these same systems. In that case, direct hydrogen bonding can be largely discounted as the key mechanism for urea stabilization of uncollapsed and/or unfolded structures.
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Affiliation(s)
- Yanjie Zhang
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, USA
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42
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Debnath S, Das D, Dutta S, Das PK. Imidazolium bromide-based ionic liquid assisted improved activity of trypsin in cationic reverse micelles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:4080-4086. [PMID: 20143862 DOI: 10.1021/la9040419] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The present work reports the imidazolium-based ionic liquids (ILs) assisted enhancement in activity of water-pool solubilized enzyme trypsin in cationic reverse micelles of CTAB. A set of imidazolium ILs (1-alkyl-3-methyl imidazolium bromides) were prepared with varying lengths of their side arm which results in the differential location of these organic salts in the reverse micelles. The different ILs offered varied activating effects on the biocatalyst. The activity of trypsin improved approximately 30-300% in the presence of 0.1-10 mM of different ILs in reverse micelles of CTAB. Trypsin showed approximately 300% (4-fold) increment in its activity in the presence of IL 2 (1-ethyl-3-methyl imidazolium bromide, EMIMBr) compared to that observed in the absence of IL in CTAB reverse micelles. The imidazolium moiety of the IL, resembling the histidine amino acid component of the catalytic triad of hydrolases and its Br(-) counterion, presumably increases the nucleophilicity of water in the vicinity of the enzyme by forming a hydrogen bond that facilitates the enzyme-catalyzed hydrolysis of the ester. However, the ILs with increasing amphiphilic character had little to no effect on the activity of trypsin due to their increased distance from the biocatalyst, as they tend to get localized toward the interfacial region of the aggregates. Dynamic light scattering experimentation was carried out in the presence of ILs to find a possible correlation between the trypsin activity and the size of the aggregates. In concurrence with the observed highest activity in the presence of IL 2, the circular dichroism (CD) spectrum of trypsin in CTAB reverse micelles doped with IL 2 exhibited the lowest mean residue ellipticity (MRE), which is closest to that of the native protein in aqueous buffer.
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Affiliation(s)
- Sisir Debnath
- Department of Biological Chemistry, Indian Association for the Cultivation of Science Jadavpur, Kolkata-700 032, India
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43
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Maiti S, Das D, Shome A, Das PK. Influence of Gold Nanoparticles of Varying Size in Improving the Lipase Activity within Cationic Reverse Micelles. Chemistry 2010; 16:1941-50. [DOI: 10.1002/chem.200901300] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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44
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Shechter I, Ramon O, Portnaya I, Paz Y, Livney YD. Microcalorimetric Study of the Effects of a Chaotropic Salt, KSCN, on the Lower Critical Solution Temperature (LCST) of Aqueous Poly(N-isopropylacrylamide) (PNIPA) Solutions. Macromolecules 2009. [DOI: 10.1021/ma9018312] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
| | - Ory Ramon
- Laboratory of Biopolymers and Food-Nanotechnology, Department of Biotechnology & Food Engineering
| | - Irina Portnaya
- Laboratory of Biopolymers and Food-Nanotechnology, Department of Biotechnology & Food Engineering
| | | | - Yoav D. Livney
- Laboratory of Biopolymers and Food-Nanotechnology, Department of Biotechnology & Food Engineering
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45
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Fedorov MV, Goodman JM, Kolombet VV, Schumm S, Socorro IM. Conformational changes of trialanine in sodium halide solutions: An in silico study. J Mol Liq 2009. [DOI: 10.1016/j.molliq.2008.10.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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46
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Das D, Das PK. Superior activity of structurally deprived enzyme-carbon nanotube hybrids in cationic reverse micelles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:4421-4428. [PMID: 19245221 DOI: 10.1021/la803753g] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In the present work, we report the superior activity of hydrophobically adsorbed enzymes onto single-walled carbon nanotubes (SWNTs) in the reverse micelles of cationic surfactants. Horseradish peroxidase and soybean peroxidase adsorbed onto SWNTs endure a notable loss in secondary structure and catalytic activity. This structurally and functionally deformed enzyme-SWNT when confined in CTAB reverse micelles showed approximately 7-9-fold enhancement in activity compared to that was in water and also importantly approximately 1500-3500 times higher activity than that of the enzymes in aqueous-organic biphasic mixtures. The activation observed for this nanobiocomposite is due to the (i) possible localization of enzyme-SWNT hybrid at the micellar interface; (ii) facile transport of substrates across the microscopic interface of reverse micelles; and (iii) greater local concentration of substrates at the augmented interfacial space in the presence of SWNT. This interfacial localization of the SWNT-protein hybrid was tested using FITC-tagged protein (BSA) by fluorescence spectroscopy. FTIR and CD spectroscopy established that the enzyme notably loses its native structure as it gets adsorbed onto the CNTs. However, this loss in the secondary structure is neither aggravated nor recovered when the enzyme-SWNT resides at the reverse micellar interface. So, localization of the surface-active peroxidase-CNT hybrids at the interface is the main reason for significant enzyme activation. The generality of the activation of the enzyme-CNT hybrid by reverse micelles was tested using amphiphiles with varying headgroup sizes, where an overall enhancement in activity was observed with an increase in headgroup size. Activation of this nanobiocomposite would find utmost importance in material science as the activity of structurally deprived enzyme in reverse micelles surpassed (approximately 1.7-fold) even the activity of the native enzyme in water.
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Affiliation(s)
- Dibyendu Das
- Department of Biological Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700 032, India
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47
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Klein R, Kellermeier M, Drechsler M, Touraud D, Kunz W. Solubilisation of stearic acid by the organic base choline hydroxide. Colloids Surf A Physicochem Eng Asp 2009. [DOI: 10.1016/j.colsurfa.2008.04.049] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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48
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Bilaničová D, Salis A, Ninham BW, Monduzzi M. Specific Anion Effects on Enzymatic Activity in Nonaqueous Media. J Phys Chem B 2008; 112:12066-72. [DOI: 10.1021/jp805451w] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dagmar Bilaničová
- Department of Chemical Sciences, University of Cagliari−CSGI Cittadella Monserrato, S.S. 554 Bivio Sestu, 09042 Monserrato, Italy, Department of Applied Mathematics, Australian National University, Canberra, Australia, and Department of Food Technology and Biotechnology, Slovak Technical University, Bratislava, Slovak Republic
| | - Andrea Salis
- Department of Chemical Sciences, University of Cagliari−CSGI Cittadella Monserrato, S.S. 554 Bivio Sestu, 09042 Monserrato, Italy, Department of Applied Mathematics, Australian National University, Canberra, Australia, and Department of Food Technology and Biotechnology, Slovak Technical University, Bratislava, Slovak Republic
| | - Barry W. Ninham
- Department of Chemical Sciences, University of Cagliari−CSGI Cittadella Monserrato, S.S. 554 Bivio Sestu, 09042 Monserrato, Italy, Department of Applied Mathematics, Australian National University, Canberra, Australia, and Department of Food Technology and Biotechnology, Slovak Technical University, Bratislava, Slovak Republic
| | - Maura Monduzzi
- Department of Chemical Sciences, University of Cagliari−CSGI Cittadella Monserrato, S.S. 554 Bivio Sestu, 09042 Monserrato, Italy, Department of Applied Mathematics, Australian National University, Canberra, Australia, and Department of Food Technology and Biotechnology, Slovak Technical University, Bratislava, Slovak Republic
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49
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Biswas R, Das AR, Pradhan T, Touraud D, Kunz W, Mahiuddin S. Spectroscopic Studies of Catanionic Reverse Microemulsion: Correlation with the Superactivity of Horseradish Peroxidase Enzyme in a Restricted Environment. J Phys Chem B 2008; 112:6620-8. [DOI: 10.1021/jp711368p] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Ranjit Biswas
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India, Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany, and Material Science Division, North−East Institute of Science and Technology, Jorhat 785006, Assam, India
| | - Arup R. Das
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India, Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany, and Material Science Division, North−East Institute of Science and Technology, Jorhat 785006, Assam, India
| | - Tuhin Pradhan
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India, Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany, and Material Science Division, North−East Institute of Science and Technology, Jorhat 785006, Assam, India
| | - Didier Touraud
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India, Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany, and Material Science Division, North−East Institute of Science and Technology, Jorhat 785006, Assam, India
| | - Werner Kunz
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India, Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany, and Material Science Division, North−East Institute of Science and Technology, Jorhat 785006, Assam, India
| | - Sekh Mahiuddin
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India, Institute of Physical and Theoretical Chemistry, University of Regensburg, D-93040 Regensburg, Germany, and Material Science Division, North−East Institute of Science and Technology, Jorhat 785006, Assam, India
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50
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Saum SH, Müller V. Regulation of osmoadaptation in the moderate halophile Halobacillus halophilus: chloride, glutamate and switching osmolyte strategies. SALINE SYSTEMS 2008; 4:4. [PMID: 18442383 PMCID: PMC2412884 DOI: 10.1186/1746-1448-4-4] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2008] [Accepted: 04/28/2008] [Indexed: 11/10/2022]
Abstract
The moderate halophile Halobacillus halophilus is the paradigm for chloride dependent growth in prokaryotes. Recent experiments shed light on the molecular basis of the chloride dependence that is reviewed here. In the presence of moderate salinities Halobacillus halophilus mainly accumulates glutamine and glutamate to adjust turgor. The transcription of glnA2 (encoding a glutamine synthetase) as well as the glutamine synthetase activity were identified as chloride dependent steps. Halobacillus halophilus switches its osmolyte strategy and produces proline as the main compatible solute at high salinities. Furthermore, Halobacillus halophilus also shifts its osmolyte strategy at the transition from the exponential to the stationary phase where proline is exchanged by ectoine. Glutamate was found as a "second messenger" essential for proline production. This observation leads to a new model of sensing salinity by sensing the physico-chemical properties of different anions.
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Affiliation(s)
- Stephan H Saum
- Molecular Microbiology & Bioenergetics, Institute of Molecular Biosciences, Goethe University Frankfurt, Frankfurt am Main, Germany.
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