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Indirect Determination of the Hydrogen Index of Small Volume Solutions by Digital Colorimetry 通过数字比色法间接测定小体积溶液的氢指数
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-10-16 DOI: 10.3103/S0027131424700330
K. V. Oskolok, O. V. Monogarova, A. V. Garmay, M. M. Ivanova
{"title":"Indirect Determination of the Hydrogen Index of Small Volume Solutions by Digital Colorimetry","authors":"K. V. Oskolok,&nbsp;O. V. Monogarova,&nbsp;A. V. Garmay,&nbsp;M. M. Ivanova","doi":"10.3103/S0027131424700330","DOIUrl":"10.3103/S0027131424700330","url":null,"abstract":"<p>A technique for the indirect determination of the hydrogen index of aqueous solutions of small volumes (ranging from microliters to hundreds of microliters) by digital colorimetry with the use of consumer optical raster imaging devices is proposed. Determining the pH does not require constant color scales or information about the concentration of the acid-base indicator in the solution. A prototype of a handheld pH analyzer, based on a smartphone, is developed for out-of-laboratory applications. The accuracy of the pH determination results is confirmed by the potentiometry and spectrophotometry techniques.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 5","pages":"311 - 317"},"PeriodicalIF":0.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443212","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
Fabrication and Thermoresponsive Properties of Thin Copolymer Films of N-Isopropylacrylamide and Acrylamide N-Isopropylacrylamide 和 Acrylamide 共聚物薄膜的制作和热致伸缩特性
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-10-16 DOI: 10.3103/S0027131424700329
N. S. Sopova, V. A. Timoshenko, V. E. Bochenkov
{"title":"Fabrication and Thermoresponsive Properties of Thin Copolymer Films of N-Isopropylacrylamide and Acrylamide","authors":"N. S. Sopova,&nbsp;V. A. Timoshenko,&nbsp;V. E. Bochenkov","doi":"10.3103/S0027131424700329","DOIUrl":"10.3103/S0027131424700329","url":null,"abstract":"<p>A new technique is proposed for obtaining thin films of a cross-copolymer of poly-<i>N</i>-isopropylacrylamide and acrylamide on glass and silicon surfaces. The technique is based on polymerization of individual monomers followed by the crosslinking of polymer chains during spin-coating onto a substrate. The effect of temperature on the hydrophobicity of the obtained films is studied. Reversible changes in the contact angle are demonstrated when the substrate temperature is varied above and below 35°C.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 5","pages":"307 - 310"},"PeriodicalIF":0.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443233","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
Application of Matrix Solid-Phase Dispersion Combined with Gas Chromatography-Mass Spectrometry for the Determination of Bisphenol A in Fresh-Water Fishes 应用基质固相分散结合气相色谱-质谱法测定淡水鱼类中的双酚 A
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-10-16 DOI: 10.3103/S0027131424700391
A. S. Gubin, A. A. Kushnir, P. T. Sukhanov
{"title":"Application of Matrix Solid-Phase Dispersion Combined with Gas Chromatography-Mass Spectrometry for the Determination of Bisphenol A in Fresh-Water Fishes","authors":"A. S. Gubin,&nbsp;A. A. Kushnir,&nbsp;P. T. Sukhanov","doi":"10.3103/S0027131424700391","DOIUrl":"10.3103/S0027131424700391","url":null,"abstract":"<p>Matrix solid-phase dispersion using a humate-based magnetic sorbent is proposed as an efficient method for the concentration of bisphenol A from fish muscular and hepatic tissue samples followed by the chromatography-mass spectrometry determination of an analyte prederivatized with acetic anhydride. Under the optimum concentration conditions (the stirring time is 10 min and the sorbent weight is 0.05 g), the recovery of bisphenol A upon single sorption reaches 85%. The percentage desorption exceeds 99% (the eluate is methanol, the time is 3 min, and the volume is 1 mL). The maximum enrichment factor is 718. The limit of the detection of bisphenol A is 0.15 μg/kg (on a dry basis) for muscular tissue and 0.25 μg/kg for liver.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 5","pages":"351 - 357"},"PeriodicalIF":0.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443181","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
Cryochemical Synthesis of Hybrid Nanoforms Based on Silver and Antibacterial Drug Dioxidine by the Low-Temperature Condensation of Vapor from the Gas Phase 通过气相蒸汽的低温凝结低温化学合成基于银和抗菌药物二氧六环的混合纳米形式
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-10-16 DOI: 10.3103/S0027131424700317
A. V. Soloviev, S. A. Gromova, Ya. A. Gromova, A. V. Shabatin, Yu. N. Morosov, T. I. Shabatina
{"title":"Cryochemical Synthesis of Hybrid Nanoforms Based on Silver and Antibacterial Drug Dioxidine by the Low-Temperature Condensation of Vapor from the Gas Phase","authors":"A. V. Soloviev,&nbsp;S. A. Gromova,&nbsp;Ya. A. Gromova,&nbsp;A. V. Shabatin,&nbsp;Yu. N. Morosov,&nbsp;T. I. Shabatina","doi":"10.3103/S0027131424700317","DOIUrl":"10.3103/S0027131424700317","url":null,"abstract":"<p>Hybrid nanoforms based on silver and the antibacterial drug dioxidine (2,3-bis-(hydroxymethyl)quinoxaline 1,4-di-<i>N</i>-oxide) are prepared by the method of joint cocondensation of metal and ligand vapors on a liquid nitrogen-cooled surface. The samples obtained are characterized by FTIR-, UV-Vis, and XPS-spectroscopy, as well as ТЕМ, SEM, and powder X-ray phase analysis (ХРА). It is shown that cryomodified nanoforms preferably consist of the anhydrous triclinic (T-phase) crystal phase of dioxidine. The dimensions of dioxidine particles ranged from 50 to 300 nm and the average size of doping silver nanoparticles is 15 ± 3 nm. The broadening of the diffraction patterns belonging to silver shows the transition of metallic silver to the nanoscale state. The FTIR results indicate hybrid nanoforms stabilized by the donor-acceptor interactions of surface silver atoms with the hydroxyl groups and with the donor N-atoms of quinoxaline cycles of dioxidine molecules.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 5","pages":"301 - 306"},"PeriodicalIF":0.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443170","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
The Structure and Dynamics of the Enzyme–Substrate Complex of N-Acetylaspartylglutamate Synthase According to the Computer Simulation Data 计算机模拟数据显示的 N-乙酰天冬氨酰谷氨酸合成酶酶-底物复合物的结构和动力学特征
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-10-16 DOI: 10.3103/S0027131424700238
I. V. Polyakov, A. V. Krivitskaya, M. G. Khrenova
{"title":"The Structure and Dynamics of the Enzyme–Substrate Complex of N-Acetylaspartylglutamate Synthase According to the Computer Simulation Data","authors":"I. V. Polyakov,&nbsp;A. V. Krivitskaya,&nbsp;M. G. Khrenova","doi":"10.3103/S0027131424700238","DOIUrl":"10.3103/S0027131424700238","url":null,"abstract":"<p><i>N</i>-Acetylaspartylglutamate (NAAG) is the most common dipeptide in brain cells, which is synthesized using the enzyme <i>N</i>-acetylaspartylglutamate synthase. In this study, we utilize bioinformatics methods to predict the protein structure based on the primary sequence of the coding gene, classical molecular dynamics to obtain a stable protein complex with <i>N</i>-acetylaspartate and glutamate ligands within the trajectory, and machine learning methods to analyze, describe, and select potential reactive and nonreactive conformations of the model system describing the enzyme–substrate complex. Molecular dynamics trajectories are obtained for a set of selected conformations within the framework of the method of combined quantum and classical molecular mechanics, and the active site of the protein–ligand complex and potential reaction mechanism are characterized.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 4","pages":"239 - 245"},"PeriodicalIF":0.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443229","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
Interaction of Copper Clusters with Dioxidine 铜簇与二氧六环的相互作用
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-10-16 DOI: 10.3103/S0027131424700226
A. Yu. Ermilov, A. V. Soloviev, Yu. N. Morosov, T. I. Shabatina
{"title":"Interaction of Copper Clusters with Dioxidine","authors":"A. Yu. Ermilov,&nbsp;A. V. Soloviev,&nbsp;Yu. N. Morosov,&nbsp;T. I. Shabatina","doi":"10.3103/S0027131424700226","DOIUrl":"10.3103/S0027131424700226","url":null,"abstract":"<p>The configurations of small copper clusters (Cu<sub>2</sub>, Cu<sub>3</sub>, Cu<sub>13</sub>) and their complexes including a complex containing a copper atom with dioxidine (Dx) are calculated by density functional theory modeling with B3LYP5 parametrization. The trends of the changes in the geometry configuration and metal cluster–dioxidine ligand interaction energy depending on the size of the metal cluster are assessed. The dissociation energy of the complexes increases with the metal cluster size but the maximum value (55.1 kcal/mol) is implemented for a Cu<sub>3</sub>–Dx complex. There is coordination of the metal atom to one or two oxygen atoms of the dioxidine molecule for all the complexes.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 4","pages":"233 - 238"},"PeriodicalIF":0.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443180","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
Modification of the Process of Cesium Separation from the Product of the High-Temperature Treatment of Spent Fuel with Molybdenum Trioxide 改进用三氧化钼高温处理乏燃料产品的铯分离工艺
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-10-16 DOI: 10.3103/S0027131424700378
V. A. Boldakov, S. S. Poglyad, A. S. Kornilov, O. S. Dmitrieva, V. N. Momotov, N. O. Pozigun, A. A. Telnova
{"title":"Modification of the Process of Cesium Separation from the Product of the High-Temperature Treatment of Spent Fuel with Molybdenum Trioxide","authors":"V. A. Boldakov,&nbsp;S. S. Poglyad,&nbsp;A. S. Kornilov,&nbsp;O. S. Dmitrieva,&nbsp;V. N. Momotov,&nbsp;N. O. Pozigun,&nbsp;A. A. Telnova","doi":"10.3103/S0027131424700378","DOIUrl":"10.3103/S0027131424700378","url":null,"abstract":"<p>The technological scheme of cesium extraction from spent fuel before hydrometallurgical reprocessing is developing in order to reduce the heat dissipation and specific activity of spent fuel. The scheme includes the joint high temperature treatment of spent fuel and molybdenum trioxide, flushing the product with an alkali solution to remove cesium, and then dissolving the fuel in nitric acid. Implementation of this technology will allow reducing the cooling time of the spent fuel and reduce the radiation impact on personnel, equipment, and technological environment. This article presents the results of the experimental substantiation of the choice of temperature of the high-temperature treatment, comparative analysis of the efficiency of flushing solutions of different compositions, and determining the duration of the cesium fractionation process. The research was conducted in laboratory conditions with the use of spent fuel imitators and radionuclide markers.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 5","pages":"338 - 344"},"PeriodicalIF":0.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443234","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
A Comparative Study of the Dynamic Behavior of Bacterial Photoregulated Adenylate Cyclases bPAC and OaPAC 细菌光调节腺苷酸环化酶 bPAC 和 OaPAC 的动态行为比较研究
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-10-16 DOI: 10.3103/S0027131424700251
M. S. Kuryshkina, A. M. Kulakova, A. A. Moskovsky, M. G. Khrenova
{"title":"A Comparative Study of the Dynamic Behavior of Bacterial Photoregulated Adenylate Cyclases bPAC and OaPAC","authors":"M. S. Kuryshkina,&nbsp;A. M. Kulakova,&nbsp;A. A. Moskovsky,&nbsp;M. G. Khrenova","doi":"10.3103/S0027131424700251","DOIUrl":"10.3103/S0027131424700251","url":null,"abstract":"<p>Photoregulated adenylate cyclases bPAC and OaPAC are compared using methods of classical molecular dynamics in the states before and after irradiation with light. The pathways of signal transduction from the photoreceptor domain to the catalytic domain are determined. The more pronounced acceleration of the catalytic reaction as a result of irradiation with light in the case of bPAC is determined both by a shift of the equilibrium towards a closed conformation and a more significant increase in the number of suboptimal pathways of allosteric signal transduction from one domain to another.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 4","pages":"257 - 261"},"PeriodicalIF":0.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443290","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
Non-Destructive Analysis of Tetracycline Drugs by the Digital Colormetric Method Using a Smartphone and the Photometrix Pro® Software 使用智能手机和 Photometrix Pro® 软件以数字比色法对四环素药物进行无损分析
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-10-16 DOI: 10.3103/S0027131424700354
V. G. Amelin, G. M. Beschastnova, Z. A. Ch. Shogah, A. V. Tretyakov, L. K. Kish
{"title":"Non-Destructive Analysis of Tetracycline Drugs by the Digital Colormetric Method Using a Smartphone and the Photometrix Pro® Software","authors":"V. G. Amelin,&nbsp;G. M. Beschastnova,&nbsp;Z. A. Ch. Shogah,&nbsp;A. V. Tretyakov,&nbsp;L. K. Kish","doi":"10.3103/S0027131424700354","DOIUrl":"10.3103/S0027131424700354","url":null,"abstract":"<p>A nondestructive analysis of tetracyclines in drugs by their own fluorescence using a smartphone and a device printed on a 3D printer is proposed. The possibility of using chemometric methods, which reduce the analysis time and visualize the obtained data, is shown. The dataset is processed by principal component analysis (PCA), hierarchical cluster analysis (HCA), partial least squares (PLS) regression, and least squares using the PhotoMetrix PRO<sup>®</sup> software. The use of chemometric methods of analysis to determine the concentration of the active substance and identify the manufacturer of medicinal products is considered.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 5","pages":"325 - 333"},"PeriodicalIF":0.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443182","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
Chemical Modification of Minerals Surfaces: Brief Sketch of Formation and Development 矿物表面的化学修饰：形成与发展简述
IF 0.7
Moscow University Chemistry Bulletin Pub Date : 2024-10-16 DOI: 10.3103/S0027131424700366
G. V. Lisichkin
{"title":"Chemical Modification of Minerals Surfaces: Brief Sketch of Formation and Development","authors":"G. V. Lisichkin","doi":"10.3103/S0027131424700366","DOIUrl":"10.3103/S0027131424700366","url":null,"abstract":"<p>This article succinctly outlines the key points of the emergence and development of methods for chemical modification of the surface of inorganic substrates. It is shown that the assumption of the presence of chemically active functional groups on such surfaces arose relatively recently, although the first experience of practical application was carried out in the middle of the 19th century. The main stages in the development of the chemistry of surface compounds are traced.</p>","PeriodicalId":709,"journal":{"name":"Moscow University Chemistry Bulletin","volume":"79 5","pages":"334 - 337"},"PeriodicalIF":0.7,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142443333","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
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