Moscow University Chemistry Bulletin
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Sàng lọc nhanh rượu vang để xác định tổng hàm lượng các hợp chất hữu cơ chứa F-, Cl-, Br- và S Dịch bởi AI
Moscow University Chemistry Bulletin - Tập 68 - Trang 223-226 - 2013
Một phương pháp nhanh chóng và trực tiếp để xác định tổng hàm lượng các hợp chất hữu cơ chứa nguyên tố dị kim trong rượu vang trắng khô đã được phát triển. Phương pháp này bao gồm việc chiết xuất dung môi các hợp chất này, loại bỏ chất chiết ra ngoài phản ứng, chuyển đổi oxi hóa tổng hợp của các chất phân tích ở nhiệt độ cao, và phân tích toàn bộ thể tích chất hấp thụ bằng sắc ký ion. Giới hạn phá...... hiện toàn bộ
#rượu vang #hợp chất hữu cơ #nguyên tố dị kim #chiết xuất dung môi #sắc ký ion
Variability of nanosystems
Moscow University Chemistry Bulletin - - 2009
The mechanism of synchronization of molecular fluctuations operates on the surface of growing nanoparticles, increasing their scale up to macroscopic. The kinetic equation for the function of state distribution of nanoparticles therefore approaches the Fokker-Planck equation, which was established experimentally by the example of nanoparticles of different natures. In a number of suspensions and a...... hiện toàn bộ
Sorption-Fluorimetric Determination of Quinolones in Waste and Natural Waters with a Smartphone
Moscow University Chemistry Bulletin - Tập 76 - Trang 262-268 - 2021
A simple, affordable, and safe (green chemistry) method is proposed for determining 17 quinolone antibiotics in waste and natural waters by the sorption-fluorimetric method using a smartphone as an analyte signal recorder. The method is based on static sorption of quinolones by silica gel from aqueous solutions. When the sorbate is irradiated with ultraviolet light (365 nm), blue or turquoise fluo...... hiện toàn bộ
Spectrophotometric determination of orthophosphate ions for conducting indicator investigations in stratal waters
Moscow University Chemistry Bulletin - Tập 67 - Trang 109-121 - 2012
The methodologies for determining orthophosphate ions by spectrophotometry and flow-injection analysis for 1995–2011 in different features are briefly described in the paper. The method of the spectrophotometric determination of orthophosphate in the form of molybdophosphoric heteropolyacid via reduced ascorbic acid in the presence of potassium antimonyl tartrate has been modified. The method allo...... hiện toàn bộ
Study of the Chromium Distribution in New Materials Based on Tin Dioxide by Inductively Coupled Plasma–Mass Spectrometry
Moscow University Chemistry Bulletin - Tập 74 - Trang 10-13 - 2019
A new approach to determine additions of chromium and study its distribution in the bulk and on the surface of SnO2-based nanocrystalline semiconductor materials using inductively coupled plasma–mass spectrometry (ICP–MS) is proposed. Potassium rhodanide is proposed to be used for determining chromium on the surface without dissolving tin. In samples synthesized by the sol–gel method, 20–30% of ch...... hiện toàn bộ
A nearly complete system of average crystallographic ionic radii and its use for determining ionization potentials
Moscow University Chemistry Bulletin - Tập 63 - Trang 303-317 - 2009
Available systems of empirical (crystallographic) ionic radii are compared. All these systems turn out to be compatible if the O2− radius is taken to be 0.140 nm. The choice of the oxygen ionic radius is dictated by the equality of the metal ion-oxygen ion distances in oxide crystals and the metal ion-oxygen atom distances in crystal hydrates and concentrated aqueous solutions. In all systems of e...... hiện toàn bộ
PlyC, an enzyme lysing group A, C, and E streptococci: Specific features of inactivation and the stabilization by intramolecular chemical crosslinking
Moscow University Chemistry Bulletin - Tập 65 Số 3 - Trang 180-185 - 2010
The heat inactivation kinetics of PlyC lysin, an enzyme that lyses groups A, C, and E streptococcal cells, has been studied. It has been demonstrated that oligomeric PlyC is inactivated according to a dissociative mechanism in the temperature range of 37–41.5°C, pH 6–8, and enzyme concentrations of 0.3–160 μg/ml and at higher (42–50°C) or lower (35–22°C) temperatures, according to a monomolecular ...... hiện toàn bộ
Production of radionuclides for nuclear therapy and environmental studies
Moscow University Chemistry Bulletin - - 2009
This work is devoted to the production of the radionuclides used in nuclear medicine and as radiotracers for environmental research. Production methods for high LET radionuclides (67Ga, 77Br, 111In, 211At) that are promising for radioimmunotherapy are proposed. Production techniques for short-lived analogues of highly radiotoxic long-lived fission products (Tc, Se, Sr) are developed. The technique...... hiện toàn bộ
Phototransformations of methylsubstituted oxiranes’ radical cations in freonic matrices at 77 K
Moscow University Chemistry Bulletin - Tập 67 Số 2 - Trang 59-71 - 2012
Novel Adsorbents for Hydrophilic Chromatography Based on Silica Gel Covalently Modified with Poly(ethylene glycol)
Moscow University Chemistry Bulletin - Tập 76 - Trang 75-84 - 2021
Novel stationary phases based on aminopropyl silica gel covalently modified with poly(ethylene glycol) (PEG) with different matrix-to-polymer mass ratios are obtained. The chromatographic properties of the adsorbents are studied using the Tanaka test procedure for hydrophilic stationary phases (and by way of example of separating model mixtures of sugars, amino acids, and water-soluble vitamins). ...... hiện toàn bộ
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