Proton Magnetic Resonance Study of the Water Lattice Distortions in Aqueous Alkali Halide Solutions.

Bergqvist, M. S.; Forslind, E; Lukkari, Sakari; Block-Bolten, A.; Toguri, J. M.; Flood, H.

doi:10.3891/acta.chem.scand.16-2069

Cited by 32 publications

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“…This apparent drift most likely reflects the salt effect on the water signal. The chemical shift displacement of the water resonance in aqueous alkali halide solutions have in fact been measured for a range of electrolytes using coaxial glass tubing, and the reported shift displacement in 1 M KC1 is -0.063 ppm (Bergqvist & Forslind, 1962). Thus, after correcting the chemical shift of the water resonance by this value, there is within the error limits no salt-induced change in the average backbone chemical shifts of the two mutants.…”

Section: Resultsmentioning

confidence: 97%

Binding of Ca2+ to Calbindin D9k: Structural Stability and Function at High Salt Concentration

Kesvatera¹,

Jönsson²,

Thulin³

et al. 1994

Biochemistry

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Calcium binding constants of wild-type calbindin D9k and mutant forms with one, two, and three neutralized negative charges in the vicinity of the Ca2+ binding sites are determined at varying KCl concentrations from 2 mM to 1 M. The results indicate that the added salt does not cause significant structural changes in calbindin D9k and, along with site-directed mutagenesis, can be used as a well-controlled means for modulating electrostatic interactions. The lack of structural changes at high salt concentrations is also supported by two-dimensional 1H NMR data. High salt concentrations are observed to substantially reduce the cooperativity of calcium binding to calbindin D9k. This suggests that the cooperativity is strongly dependent on electrostatic interactions. The data have been used to test a dielectric continuum model for protein electrostatics using a macroscopic dielectric constant of water throughout the system. Excellent agreement between experiment and Monte Carlo simulations is observed for the whole set of data covering changes in the binding constant of more than 6 orders of magnitude. A simplified theoretical treatment using the Kirkwood-Tanford formula, based on the Debye-Hückel approximation, yields an almost equally good agreement with the experiment.

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Section: Resultsmentioning

confidence: 97%

Binding of Ca2+ to Calbindin D9k: Structural Stability and Function at High Salt Concentration

Kesvatera¹,

Jönsson²,

Thulin³

et al. 1994

Biochemistry

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“…Proton magnetic resonance which has been used to investigate the solvation behavior of ions in aqueous solutions (1)(2)(3)(4) has bcen extended t o non-aqueous media as well (5). Recently 1,3-dimethylethyleneiirea (DMEU) has been investigated with regard t o somc of its fundamental properties (0) and to the behavior of electrolytes therein (7,8).…”

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confidence: 99%

Nuclear magnetic resonance study of electrolytes in 1,3-dimethylethyleneurea

Rosenfarb¹,

Caruso²

1976

Can. J. Chem.

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JOSEPH ROSENFARB and JOSEPH A . CARUSO. Can. J. Chem. 54, 3492 (1976). A series of lithium, sotlium. potassium, and ammonium salts were investigated by proton magnetic resonance spectroscopy in 1,3-di1nethyIethylene~~rea. a relatively new non-aqueous solvent of high polarity and moderately high dielectric constant. The salts were found to shift the solvent proton peaks linearly as a function of salt concentration. Thiosulfate, perchlorate, and iodide salts shifted the solvent peaks downfield while tetraphenylborate salts uniquely shifted the peaks upfield indicating an ~~n u s u a l type of solvation behavior for the tetraphenyiborates in this solvent.JOSEPH ROSENFARB et JOSEPH A. CARUSO. Can. J. Chem. 54, 3192 (1976). On a CtudiC par rmil du proton dans la dimCt11y-1-1.3 ethylkne urke un solvant non aqueux relativement nouveau de haute polarit6 et de constante dieiectrique modCree, une sCrie de sels de lithium, de sodium, de potassium et d'ammonium. On a trouve que les sels dkplacent les signaux des protons du solvant d'une f a~o n lineaire en fonction de la concentration du sel. Les sels du thiosulfate. du perchlorate et de l'iodure deplacent les pics du solvant vers les bas champs alors que les sels du tCtraphinylborate sont les seuk B tiiplacer les pics vers les hauts champs; ces resultats indiquent un type particulier de colnportemene desolvatation des iCtraphenylborates dans ce solvant.[Traduit par le journal]Proton magnetic resonance which has been used to investigate the solvation behavior of ions in aqueous solutions (1-4) has bcen extended t o non-aqueous media as well (5). Recently 1,3-dimethylethyleneiirea (DMEU) has been investigated with regard t o somc of its fundamental properties (0) and to the behavior of electrolytes therein (7,8). It was found that DMEU is a solvent of high polarity (4.09 in dioxane) (9), moderately high dielectric constant (37.6 at 1 MHz) (6). and possesses good dissociative power towards electrolytes, comparable to that of hr-methyl-2-pyrrolidone and methanol. Particularl!~ interesting kvas the property that sodium and potassiu:~~ salts were isoconducting in DMEU (7). Therefore further study into the nature of solvation in DMEU was indicated.cipitates were thoroughly washed with deionized water, dried, and recrystallized from acetone with water portions. All salts were finely ground and dried in the appropriate manner (5, 7, 10).DMEU was freshly prepared as previously described (6) and had a specific conductance of about 5 X ohm-' ~111-1. MeasurenzetztsChemical shift data were obtained using a Varian A-60 nmr spectrometer. Tetramethylsilane ( 5 ' ; ) was used as an internal reference from which peak shifts were calculated. Since an internal reference was used. no bulk diamagnetic correctio~s were applied (11). Shift data were reproducible to t 0.3 Hz or 0.005 ppm.Results and Discussion A number of alkali halides, tetraalkylammonium salts, and multivalent salts have been investigated in aqueous solution (1,12). It was Experimentalobserved that a downfield (negative) shift of...

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“…by W Drost-Hansen and others [ 18 ]. Erik Forslind was a pioneer on NMR in Sweden and studied water and its electrolyte solutions by conventional 1 H NMR [ 19 , 20 ].…”

Section: Electrolyte Solutions: Large Ions Bind To Hydrophobic Sitesmentioning

confidence: 99%

From surfactant to cellulose and DNA self-assembly. A 50-year journey

Lindman

2016

Colloid Polym Sci

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Surfactants have been the basis for applications in several industrial sectors for a long time. However, fundamental research was 50 years ago still limited to a small number of academic groups and even basic aspects were controversial. The field has since undergone an enormous expansion and the improved understanding has laid the basis of numerous new products as well as been the basis of important parts of nano-science and -technology.The present author has during 50 years in academia devoted most of his research to amphiphilic compounds, including both surfactants and polymers. Hereby, I had the privilege of following a very exciting development. In 2015, I had the honour to receive the Life-time Achievement Award of IACIS, the International Association of Colloid and Interface Scientists. IACIS organizes since the 1970s a tri-annual symposium, typically the best attended in the field. For the first time since 2000, it was in 2015 organized in Europe, namely Mainz, Germany. This treatise is based on my award lecture in Mainz, which covered developments from my first research as a new Ph D student in Stockholm to current work as an emeritus and visiting professor. Interestingly, discoveries in my very early work contributed to solving problems in now on-going research. Håkan Wennerström kindly wrote a quite comprehensive paper about my achievements a few years ago (Adv Colloid Interf Sci 205:1–8, [1]). In writing the present paper, I have strived at covering mainly topics not treated in detail by Håkan. In fact, I will emphasize very much our early studies as well as our studies of surfactant self-assembly by NMR and in particular look at the developments of our research and connections between different research topics.

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Proton Magnetic Resonance Study of the Water Lattice Distortions in Aqueous Alkali Halide Solutions.

Cited by 32 publications

References 0 publications

Binding of Ca2+ to Calbindin D9k: Structural Stability and Function at High Salt Concentration

Binding of Ca2+ to Calbindin D9k: Structural Stability and Function at High Salt Concentration

Nuclear magnetic resonance study of electrolytes in 1,3-dimethylethyleneurea

From surfactant to cellulose and DNA self-assembly. A 50-year journey

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