排序方式: 共有8条查询结果,搜索用时 15 毫秒
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Kozetozhets I. V. Panasyuk G. P. Semenov E. A. Buzanov G. A. Avdeeva V. V. Danchevskaya M. N. Tsvetov N. S. Shapovalov S. S. Vasilev M. G. 《Russian Journal of General Chemistry》2022,91(1):S98-S105
Russian Journal of General Chemistry - Highly dispersed CaO has been synthesized by heating an aqueous solution of calcium nitrate and D-glucose up to 800°C. Calcium oxide is formed with an... 相似文献
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V. A. Lebedev V. I. Sal’nikov V. V. Tsvetov A. V. Bychkov Yu. P. Savochkin M. V. Kormilitsyn 《Russian Journal of Applied Chemistry》2008,81(11):1904-1908
Potentialities of low-temperature (300–500°C) chlorination to remove the aluminum cladding of fuel elements and separate uranium and aluminum were studied. 相似文献
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Nikita Tsvetov Elena Pasichnik Anna Korovkina Alevtina Gosteva 《Molecules (Basel, Switzerland)》2022,27(13)
Chamaenerion angustifolium (L.) Scop. (fireweed) is a perennial herbaceous plant of the Onagraceae family widely used in folk and scientific medicine. It is a promising source of bioactive components. One of the modern trends in extraction is the use of natural deep eutectic solvents (NADESs) combined with ultrasound-assisted extraction (UAE). However, works devoted to the extraction of biologically active substances from C. angustifolium using NADESs are scarce. The aim of this work is a comprehensive study of UAE of bioactive components from C. angustifolium using NADESs based on choline chloride and malonic, malic, tartaric, and citric acids. The antioxidative properties, total phenols, and flavonoids content were estimated for NADES-based extracts. The reference solvents were water and 90% v/v ethanol. Volatile extracted components were identified using GC-MS. The kinetics of the UAE were studied at 45 °C for 20–180 min with water added to 30 wt% NADES. The power of the ultrasound was 120 W, and the frequency was 40 kHz. It was found that NADES choline chloride + citric acid is more effective for the extraction of bioactive components. For this, NADES UAE conditions were optimized following a Box–Behnken design of the experiment and a response surface methodology. The temperature ranged from 30 to 60 °C, the time of extraction ranged from 20 to 60, and the addition of water ranged from 30 to 70 wt%. We established the optimal extraction conditions: temperature 58 °C, time of extraction 35 min, and 70 wt% water. The obtained results expand the knowledge about the use of NADES for the extraction of biologically active compounds from cheap and available plant raw materials. 相似文献
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Kozerozhets I. V. Panasyuk G. P. Semenov E. A. Buzanov G. A. Avdeeva V. V. Danchevskaya M. N. Tsvetov N. S. Shapovalov S. S. Vasil’ev M. G. 《Russian Journal of General Chemistry》2022,92(4):743-743
Russian Journal of General Chemistry - Erratum 相似文献
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Tsvetov Nikita Sadaeva Anna Toikka Maria Zvereva Irina Toikka Alexander 《Journal of Thermal Analysis and Calorimetry》2020,142(5):1977-1987
Journal of Thermal Analysis and Calorimetry - In this work, the new set of the data on the excess heat capacity (CPE ), density (ρ) and excess volumes (VE) for binary system... 相似文献
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Tsvetov Nikita Letyanina Irina Zvereva Irina Toikka Alexander 《Journal of Thermal Analysis and Calorimetry》2018,133(2):1149-1156
Journal of Thermal Analysis and Calorimetry - Excess molar enthalpies, H m E , for the ternary mixture n-propanol (n-PrOH) + n-propyl acetate (n-PrOAc) + water... 相似文献
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Alevtina N. Gosteva Mayya V. Kulikova Yulya P. Semushina Mariya V. Chudakova Nikita S. Tsvetov Vasilii V. Semushin 《Molecules (Basel, Switzerland)》2021,26(13)
Currently, the processes of obtaining synthetic liquid hydrocarbons and oxygenates are very relevant. Fischer-Tropsch synthesis (FTS) is the most important step in these processes. The products of thermal destruction in argon of the mixture [Co(NH3)6][Fe(CN)6] and Al(OH)3 were used as catalysts for CO hydrogenation. The resulting compositions were studied using powder X-ray diffraction, IR spectroscopy, elemental analysis, SEM micrographs. The specific surface area, pore and particle size distributions were determined. It was determined that the DCS-based catalysts were active in the high-temperature Fischer-Tropsch synthesis. The effect of aluminum in the catalyst composition on the distribution of reaction products was revealed. 相似文献
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