Journal of the Belarusian State University. Chemistry最新文献_第2页

Fluorescent properties and protein-ligand interactions of boron dipyrromethene molecular rotor 二吡咯甲烷硼分子转子的荧光特性及蛋白质与配体的相互作用

Journal of the Belarusian State University. Chemistry Pub Date : 2022-04-07 DOI: 10.33581/2520-257x-2022-1-61-71

A. Dudko, M. Horetski, N. Frolova, Y. Faletrov, V. Shkumatov

引用次数: 0

Properties of nickel – tin coatings deposited from aqueous and non-aqueous electrolytes 水和非水电解质沉积镍锡涂层的性能

Journal of the Belarusian State University. Chemistry Pub Date : 2022-04-06 DOI: 10.33581/2520-257x-2022-1-72-82

A. Kudaka, T. N. Vorobyova

引用次数: 0

Fluorescein dihexanoate as a profluorescent marker for monitoring of hydrolytic descruction of polylactide-based materials 二己酸荧光素作为监测聚乳酸基材料水解破坏的前荧光标记物

Journal of the Belarusian State University. Chemistry Pub Date : 2022-04-06 DOI: 10.33581/2520-257x-2022-1-53-60

D. Belov, Y. Faletrov, P. Yakovets, V. Shkumatov

引用次数: 0

Influence of 3-acetyl-5-hydroxy-2-methylindole on glioma cell proliferation and metabolism 3-乙酰基-5-羟基-2-甲基吲哚对胶质瘤细胞增殖和代谢的影响

Journal of the Belarusian State University. Chemistry Pub Date : 2022-03-30 DOI: 10.33581/2520-257x-2022-1-43-52

J. Panada, V. Klopava, T. Kulahava, Y. Faletrov, M. Horetski, N. Frolova, S. Koran, E. Fomina, V. Shkumatov

引用次数: 0

Extraction of anabolic steroids with aqueous-organic mixtures from hexanic solutions 水-有机混合物萃取己烷溶液中的合成代谢类固醇

Journal of the Belarusian State University. Chemistry Pub Date : 2022-03-23 DOI: 10.33581/2520-257x-2022-1-31-42

S. Leschev, Y. Pakhadnia, Aliaksandr A. Ahabalayeu, M. Zayats

{"title":"Extraction of anabolic steroids with aqueous-organic mixtures from hexanic solutions","authors":"S. Leschev, Y. Pakhadnia, Aliaksandr A. Ahabalayeu, M. Zayats","doi":"10.33581/2520-257x-2022-1-31-42","DOIUrl":"https://doi.org/10.33581/2520-257x-2022-1-31-42","url":null,"abstract":"The extraction of anabolic steroids (1,4-androstadiene-3,17-dione; 17α-methyltestosterone; 19-norethiocholanolone; 4-hydroxytestosterone; 4-androstene-3,17-dione; 5α-androstane-3β,17β-diol; dehydroepiandrosterone; calusterone; clostebol; methandienone; methyldienolone; nandrolone; testosterone; epitestosterone; tibolone; 19-norandrostenedione; 1-methylene-5α-androstan-3α-ol-17-one) by aqueous-organic mixtures from hexane solutions was studied at the temperature (20 ± 1) °C. Based on the experimental data obtained, the partition ratios of anabolic steroids were calculated, which were used to optimise the standard sample preparation procedure in the process of determining the compounds under study in biologically active dietary supplements and specialised sports nutrition. It was found that the most effective and selective extractants from hydrocarbon solutions are water-acetonitrile mixtures containing from 10 to 20 % by volume of water. An extraction technique has been developed for sample preparation of biologically active dietary supplements for subsequent gas chromatographic determination of anabolic steroids in them using a triple quadrupole mass spectrometric detector. The proposed method is characterised by a standard deviation of 10–15 % and a detection limit about 10 μg/kg of biologically active dietary supplements, which makes it possible to reliably determine impurities of prohibited anabolic steroids in them.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85366332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermodynamic properties of temozolomide in crystalline and gaseous aggregate states 替莫唑胺结晶和气态聚集态的热力学性质

Journal of the Belarusian State University. Chemistry Pub Date : 2022-03-22 DOI: 10.33581/2520-257x-2022-1-18-30

Y. N. Yurkshtovich, A. Blokhin

{"title":"Thermodynamic properties of temozolomide in crystalline and gaseous aggregate states","authors":"Y. N. Yurkshtovich, A. Blokhin","doi":"10.33581/2520-257x-2022-1-18-30","DOIUrl":"https://doi.org/10.33581/2520-257x-2022-1-18-30","url":null,"abstract":"Temozolomide (4-methyl-5-oxo-2,3,4,6,8-pentazabicyclo[4,3,0]nona-2,7,9-triene-9-carboxamide) is an active component of antitumor immunosuppressive alkylating drugs, and it used largely for the treatment of various types of malignant tumors, including malignant gliomas that are difficult to treat by surgery (glioblastoma multiforme and anaplastic astrocytoma). Wide field of temozolomide application dictates the need for its comprehensive thermodynamic study. In this work temperature dependance of the temozolomide heat capacity was obtained using the adiabatic calorimetry method and the standard thermodynamic functions of crystalline temozolomide were calculated in the temperature range 80–370 K. Standard thermodynamic functions of the temozolomide in the ideal gas state were calculated using the statistical thermodynamics approach in the temperature range 0–1000 K. To obtain the standard internal energy and enthalpies of combustion and formation of crystalline temozolomide at T = 298.15 K the combustion bomb calorimetry was used. Standard enthalpy of formation of the gaseous temozolomide was calculated in the framework of the isodesmic reactions method using quantum chemical computing. To calculate standard sublimation enthalpy of temozolomide the electrostatic potential model was applied. The results obtained can find application in solving problems of optimisation of temozolomide production processes and to validate experimentally obtained values of thermodynamic properties of the temozolomide.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85560306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Aggregative stability of colloidal 3D and 2D silver nanoparticles, stabilised by 11-mercaptoundecanoic acid, in the presence of singly charged cations 胶体三维和二维银纳米颗粒的聚集稳定性，由11-巯基十四酸稳定，在单电荷阳离子存在下

Journal of the Belarusian State University. Chemistry Pub Date : 2022-03-16 DOI: 10.33581/2520-257x-2022-1-3-17

P. Malakhovsky, Alexey V. Rashkevich, E. A. Minakov, M. Artemyev

{"title":"Aggregative stability of colloidal 3D and 2D silver nanoparticles, stabilised by 11-mercaptoundecanoic acid, in the presence of singly charged cations","authors":"P. Malakhovsky, Alexey V. Rashkevich, E. A. Minakov, M. Artemyev","doi":"10.33581/2520-257x-2022-1-3-17","DOIUrl":"https://doi.org/10.33581/2520-257x-2022-1-3-17","url":null,"abstract":"We studied the aggregative stability of colloidal silver quasi-spherical nanoparticles and two-dimensional nanoplates, stabilised by 11-mercaptoundecanoic acid, in the presence of phosphate buffers containing different singly charged cations (Li+ , Na+ , K+ , Cs+) and tris-HCl at pH 8.0 and concentration 0.02 mol/L which mimics the carbodiimide conjugation conditions of nanoparticles with biomolecules. Aggregation of silver nanoplates occurs in the presence of Na-phosphate buffer whereas at the same conditions the quasi-spherical nanoparticles retain colloidal stability. The difference in colloidal stability between 3D and 2D silver nanoparticles is due to the increase of the apparent acid dissociation constant on the nanoplates’ basal faces and the subsequent increase in specific bridging interactions nanoparticle – cation – nanoparticle which can be eliminated by introducing of non-ionic spacer (11-mercapto-1-undecanol) in the ligand layer. Silver nanoplates with mixed ligand layer have increased colloidal stability across the pH.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73822393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sampling and concentration of polycyclic aromatic hydrocarbons from exhaust gases from a plant for synthesis of carbon nanomaterials 从碳纳米材料合成厂的废气中取样和浓缩多环芳烃

Journal of the Belarusian State University. Chemistry Pub Date : 2021-09-22 DOI: 10.33581/2520-257x-2021-2-62-73

S. M. Leschev, T. Henarava

{"title":"Sampling and concentration of polycyclic aromatic hydrocarbons from exhaust gases from a plant for synthesis of carbon nanomaterials","authors":"S. M. Leschev, T. Henarava","doi":"10.33581/2520-257x-2021-2-62-73","DOIUrl":"https://doi.org/10.33581/2520-257x-2021-2-62-73","url":null,"abstract":"Currently, there is an increase in the production of carbon nanomaterials in the world, which is associated with their unique physical and mechanical properties and their use in various fields of science, industry and technology. Investigation of the chemical composition of waste gases from a propane-butane mixture pyrolysis unit during the synthesis of carbon nanomaterials is of scientific and applied value, since it allows one to study both the chemistry of the pyrolysis process of hydrocarbon mixtures and determine the degree of toxicity of waste gas from pyrolysis units. The quantitative determination of polycyclic aromatic hydrocarbons in the gaseous products of pyrolysis of a propane-butane mixture during the synthesis of carbon nanomaterials has shown that when sampling with a small amount of the Supelpak-2 adsorbent, which is widely used in international and domestic methods, efficient capture of multinuclear aromatic hydrocarbons is not ensured. Therefore, an important research issue is the development of a simple and effective method for sampling polycyclic aromatic hydrocarbons with their subsequent GC-MS analysis. The principal essence of the technique is the impregnation of two fiberglass filters with an organic low-volatile solvent – diethylene glycol, tetraethylene glycol or dimethyl sulfoxide. The latter is characterised by the highest extracting power in relation to polycyclic aromatic hydrocarbons. The developed technique makes it possible to increase the efficiency of capturing multinuclear aromatic hydrocarbons (with four or more rings in a molecule) to 96–98 % compared to a solid adsorbent under equal conditions (pyrolysis conditions, weight of adsorbent equal with filters impregnated with a solvent), where the degree of their extraction is 1–5 %. The established values of the degree of recovery of the measured components are explained by the high extracting ability of dimethyl sulfoxide in relation to multinuclear aromatic hydrocarbons.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88190669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantum chemical study of NO reduction mechanism on Ag /Al2O3 catalysts Ag /Al2O3催化剂上NO还原机理的量子化学研究

Journal of the Belarusian State University. Chemistry Pub Date : 2021-09-22 DOI: 10.33581/2520-257x-2021-2-17-24

Ekaterina G. Ragoyja, V. Matulis, O. Ivashkevich

{"title":"Quantum chemical study of NO reduction mechanism on Ag /Al2O3 catalysts","authors":"Ekaterina G. Ragoyja, V. Matulis, O. Ivashkevich","doi":"10.33581/2520-257x-2021-2-17-24","DOIUrl":"https://doi.org/10.33581/2520-257x-2021-2-17-24","url":null,"abstract":"It was shown that N2O content among NO reduction products increases with an increase of the silver concentration in the catalyst because the nature of the catalytic centers changes and leads to a subsequent change in the mechanism of the reaction. Two reaction mechanisms were proposed and studied by means of quantum chemistry: a two-stage mechanism that proceeds via NO dimer formation on catalysts with high (above 2 wt. %) silver concentration and a parallel mechanism with isocyanates involved on catalysts with low (below 2 wt. %) silver concentration. It was demonstrated that on catalysts with high silver concentration mechanism that involves stepwise NO reduction via N2O to N2 is realised. Moreover, the final stage is complicated by the fact that formed intermediates and N2O are likely to desorb from the catalyst surface. In the case of catalysts with low silver concentration, the formation of both products (N2O and N2) proceeds in parallel and the lower activation barriers of the reaction leading to N2, as well as the thermodynamic profitability of its formation, lead to the predominance of the target product. The competition between the proposed mechanisms was studied in the case of catalytic centers represented by silver dimers. It was shown that activation barriers of reaction proceeding via NO dimer formation are lower than the corresponding barriers of the reaction with isocyanates involved, which confirms the prevalent realisation of the first process and the predominance of N2O among the final products. The obtained results explain the experimental data and are significant for further modelling of the mechanism of nitrogen oxides catalytic reduction considering the Al2O3 support.","PeriodicalId":17303,"journal":{"name":"Journal of the Belarusian State University. Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73076591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and study of thermostable composites based on solid magnesium phosphate and calcium phosphate binders 固体磷酸镁-磷酸钙复合材料的制备与研究

Journal of the Belarusian State University. Chemistry Pub Date : 2021-09-22 DOI: 10.33581/2520-257x-2021-2-50-61

Natalia Apanasevich, K. Lapko, Alexander N. Kudlash, A. Sokal, Yury D. Kliaulin, K. Vishnevskii

引用次数: 0