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Lebedevа, N. Sh.; V’yugin, A. I.; Михайловский, К. В.

doi:10.1023/a:1026373406523

Cited by 8 publications

(12 citation statements)

References 7 publications

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“…[12] Molecular complex formation of the studied porphyrins with BSA was studied by isothermal titration calorimetry using a differential automatic titration calorimeter. [13] Calculation of thermodynamic characteristics of the complex formation has been reported by us in work. [14] Results and Discussion…”

Section: Methodsmentioning

confidence: 99%

Thermodynamic Aspects of Binding Proteins with Porphyrins. Spectral and Thermochemical Approaches

Lebedevа¹,

Gubarev²,

Lyubimtsev³

et al. 2017

MHC

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Section: Methodsmentioning

confidence: 99%

Thermodynamic Aspects of Binding Proteins with Porphyrins. Spectral and Thermochemical Approaches

Lebedevа¹,

Gubarev²,

Lyubimtsev³

et al. 2017

MHC

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“…A highly sensitive automatic differential titration calorimeter designed for detecting the low heat effects of endo-and exothermic processes [15] was used to measure the heats of fatty acid adsorption on magnetite surface. The sensitivity of this calorimeter was 0.1098-0.0910 V/W that made it possible to perform the titration in dilute solutions with a titrant concentration below 10 -6 mol/l.…”

Section: Methodsmentioning

confidence: 99%

Adsorption of fatty acids from solutions in organic solvents on the surface of finely dispersed magnetite: 2. Heats of oleic, linoleic, and linolenic acid adsorption from carbon tetrachloride and hexane

2004

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Differential and integral heats of oleic, linoleic, and linolenic acid adsorption on the surface of finely dispersed magnetite from solutions in carbon tetrachloride and hexane are measured by the calorimetric method. The thermodynamic parameters of the adsorption for the systems under examination are calculated from the obtained experimental data. It is discovered that, at low concentrations, the volume filling of micropores in the particle aggregates of the adsorbent occurs with the formation of ordered adsorbate structures in the pores. At high concentrations, the fatty acids are adsorbed in mesopores and on the outer surface of the adsorbent. It is shown that, at high concentrations, the key contributions to the integral heat of adsorption are made by the endothermic processes of desolvation of adsorbates and the adsorbent surface, as well as by the competitive adsorption of solvent and fatty acid molecules on the active sites of the adsorbent surface.

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“…Heat effects of interactions in the systems under study were measured using automated differential titration calorimeter. Its design, parameters, and calibration are described in [15]. An aqueous solution of 18-crown-6 ( 2-3 × 10 -3 mol/dm 3 ) was placed in calorimetric cell and an aqueous solution of monosaccharide (0.2-0.3 mol/dm 3 ) was placed in injection syringer (the dose volume was 7.64 × 10 -5 dm 3 ).…”

mentioning

confidence: 99%

Complexation of D-Xylose and L-Arabinose with 18-Crown-6 in Aqueous Solutions: Calorimetric, Densimetric, and Viscometric Studies

2005

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Saccharides participate in the most vitally important biochemical processes involving the formation of molecular complexes. As components of glycoproteins and glycolipids, saccharides perform the receptor functions on a surface of the cell membranes as receptor with respect to medicines [1,2], viruses and bacteria [3,4]. Saccharides also participate in formation of enzyme-substrate complexes [5] and determine the antigen-antibody interactions [5,6]. All these processes include recognition of the reagent structure in the course of complex formation.The selective interactions of mono-and oligosaccharides with compounds of different nature and structure in solutions are of interest today [7][8][9][10][11]. The analysis of the literature data shows that these interactions occur due to noncovalent forces (van der Waals and electrostatic interactions, hydrogen bonds, etc.). The authors of [7][8][9] concluded that capability of saccharides to form complexes is determined by their structures. However, in many cases, the nature of intermolecular interactions in saccharide complexes, their peculiar features, and the role of a solvent in these processes remain still unclear. Some disaccharides were shown to give thermodynamically stable and entropystabilized complexes with 1,4,7,10,13,16-hexaoxacyclooctadecane ( 18-crown-6 ) [12,13].This paper reports the results of integrated study of interactions of two pentoses (D-xylose and L-arabinose) with 18-crow-6 in water at 298.15 K. Crown ethers are known to be models of cyclic antibiotics and enzymes [14]. Therefore, the study of complexation of monosaccharides with crown ethers is of special interest.EXPERIMENTAL 18-Crown-6 (ICN Biomedicals Co.), D-xylose, and L-arabinose (Fluka) with purity > 99% were used as received. All reagents were dried before experiments in vacuum at 323 K (crown ether) and 343 K (monosaccharides) for several days. The solutions were prepared using freshly twice-distilled degassed water by gravimetric method.Calorimetric titration. Heat effects of interactions in the systems under study were measured using automated differential titration calorimeter. Its design, parameters, and calibration are described in [15]. An aqueous solution of 18-crown-6 ( 2-3 × 10 -3 mol/dm 3 ) was placed in calorimetric cell and an aqueous solution of monosaccharide (0.2-0.3 mol/dm 3 ) was placed in injection syringer (the dose volume was 7.64 × 10 -5 dm 3 ). The procedure of calorimetric experiment and details of data collection and processing were similar to those in [12,13]. The titration curves of the systems under investigation at 289.15 K are presented in Fig. 1.Densimetry. The density of the studied solutions was measured on a magnetic-float densimeter with a design similar to that used in [16,17]. The values of a float volume and solenoid constant were found from calibration of a system against water ( ρ 298.15 (H 2 O) = 997.04 kg/m 3 [18]) using set of weights. The weight of platinum rings was chosen such that the working current was 0.05 ≤ i ≤ 0.13 A. The current wa...

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Untitled

Cited by 8 publications

References 7 publications

Thermodynamic Aspects of Binding Proteins with Porphyrins. Spectral and Thermochemical Approaches

Thermodynamic Aspects of Binding Proteins with Porphyrins. Spectral and Thermochemical Approaches

Adsorption of fatty acids from solutions in organic solvents on the surface of finely dispersed magnetite: 2. Heats of oleic, linoleic, and linolenic acid adsorption from carbon tetrachloride and hexane

Complexation of D-Xylose and L-Arabinose with 18-Crown-6 in Aqueous Solutions: Calorimetric, Densimetric, and Viscometric Studies

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