Methods and Objects of Chemical Analysis最新文献_第6页

Enhanced Electrochemical Determination Of Riboflavin In Biological And Pharmaceutical Samples At Poly (Arginine) Modified Carbon Paste Electrode 聚精氨酸修饰碳糊电极强化电化学测定生物和药物样品中的核黄素

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Methods and Objects of Chemical Analysis Pub Date : 2019-01-01 DOI: 10.17721/moca.2019.216-223

Girish Tigari, J. G. Manjunatha, D. Ravishankar, G. Siddaraju

引用次数: 8

Simultaneous Kinetic Spectrophotometric Determination Of Ascorbic Acid And Cysteine With An Optical Probe By Mean Centering Of Ratio Kinetic Profiles Method 比例平均居中动力学谱法光学探针同时测定抗坏血酸和半胱氨酸

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Methods and Objects of Chemical Analysis Pub Date : 2019-01-01 DOI: 10.17721/moca.2019.163-170

A. Vishnikin, Yuliia V. Miekh, Y. Bazel, M. Al-Shwaiyat, G. O. Petrushina

引用次数: 0

Chemometric Approaches In Analysis Of Vegetable Oils As A Way To Improve An Efficiency Of Forensic Examination 化学计量学方法在植物油分析中的应用——提高法医鉴定效率

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Methods and Objects of Chemical Analysis Pub Date : 2019-01-01 DOI: 10.17721/moca.2019.192-199

V. Rudniev, E. Simakova-Yefremian, V. Khosha, V. Ostropilets

引用次数: 0

Intelligent Multisensor System For Analytical Control Of Sausages 香肠分析控制的智能多传感器系统

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Methods and Objects of Chemical Analysis Pub Date : 2019-01-01 DOI: 10.17721/moca.2019.57-72

A. Kalinichenko, L. U. Arseniyeva

{"title":"Intelligent Multisensor System For Analytical Control Of Sausages","authors":"A. Kalinichenko, L. U. Arseniyeva","doi":"10.17721/moca.2019.57-72","DOIUrl":"https://doi.org/10.17721/moca.2019.57-72","url":null,"abstract":"The new technique of intelligent analysis of chemical aroma patterns of boiled sausages obtained by the electronic nose for authentication and microbiological safety assessment is developed. The informativeness of features extracted from steady-state responses of the multisensor system and robustness of chemometric algorithms for solving the objectives of qualitative and quantitative analysis of sausage volatile compounds are investigated. The classification model was built using maximum response values as input vectors of an optimized probabilistic neural network, which allows obtaining a 100 % accuracy of different sample grades identification and detection samples adulterated with soy protein. The method of partial least squares regression and area values as features were used for regression modelling and prediction of QMAFAnM with a relative error less than 12 % for a microbiological safety assessment of previously identified sausages. The use of the robust analytical technique to assess authentication, adulteration, total bacterial count for one measurement using the electronic nose in combination with machine learning algorithms will allow to significantly reduce the measurement time and the cost of analysis, and avoid subjective estimation of the results.","PeriodicalId":18626,"journal":{"name":"Methods and Objects of Chemical Analysis","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67435495","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

Value Of The Index Of Chemical Oxygen Demand As Measure Of The Methanol Content In Return Underground Local-Water Of Oil And Gas Condensate Fields 化学需氧量指标作为衡量油气凝析田地下回水甲醇含量的价值

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Methods and Objects of Chemical Analysis Pub Date : 2019-01-01 DOI: 10.17721/moca.2019.73-78

E. A. Reshetnyak, N. N. Nemets, O. Chernyshova, V. M. Ostrovskaya

引用次数: 0

Іdentification Of Gasoline In Altered Mixture With Diesel Fuel Іdentification汽油与柴油混合物的变化

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Methods and Objects of Chemical Analysis Pub Date : 2019-01-01 DOI: 10.17721/moca.2019.102-112

V. Rudniev, O. Kliuiev, O. Uhrovetskyi

{"title":"Іdentification Of Gasoline In Altered Mixture With Diesel Fuel","authors":"V. Rudniev, O. Kliuiev, O. Uhrovetskyi","doi":"10.17721/moca.2019.102-112","DOIUrl":"https://doi.org/10.17721/moca.2019.102-112","url":null,"abstract":"The methodological approach to identification of gasoline with an admixture of diesel fuel was presented. The approach involves using of gas chromatography–mass-spectrometry analysis of altered mixture. An algorithm of gas chromatography profile treatment includes analysis of extracted ion chromatogram for searching of polyaromatic hydrocarbons with 2 to 4 aromatic ring, mostly naphthalene, anthracene, phenanthrene and pyrene derivatives. The complex of specified components can be used as indicator of gasoline presence in mixture in the case if its chromatographic profile by total ion chromatogram is typical for diesel fuel. Obtained results show in common high similarity of chromatographic profile of altered diesel fuel and gasoline with small admixture (0.25 vol.%) of diesel fuel. A wrong identification results may be obtained without taking into account presence of pointed polyaromatic hydrocarbons. Such complex cannot be found entirely in pure diesel fuel in initial or altered state because its components are below or about of limit of detection. Determined limit of detection for polyaromatic hydrocarbons (naphthalene, phenanthrene, anthracene, pyrene) is 1.8-2.2 μg/ml.","PeriodicalId":18626,"journal":{"name":"Methods and Objects of Chemical Analysis","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67433979","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 New Oxidative Derivatization Method For The Indirect Spectrofluorimetric Determination Of Prochlorperazine Maleate In Pharmaceutical Preparations 氧化衍生间接荧光光谱法测定药物制剂中马来酸丙氯哌嗪含量的新方法

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Methods and Objects of Chemical Analysis Pub Date : 2019-01-01 DOI: 10.17721/moca.2019.140-145

M. Blazheyevskiy, Yu. V. Skrypynets, A. Yegorova, V. Antonovich

引用次数: 0

Investigation Of Kinetic Regularities For Obtaining Methyl-1,3,4- Trimethylcyclohex-3-Encarboxylate By Reaction Of Diels-Alder Diels-Alder反应制备甲基-1,3,4-三甲基环己基-3-羧化酸酯的动力学规律研究

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Methods and Objects of Chemical Analysis Pub Date : 2019-01-01 DOI: 10.17721/moca.2019.208-215

I. Kostiv, R. Havryliv

{"title":"Investigation Of Kinetic Regularities For Obtaining Methyl-1,3,4- Trimethylcyclohex-3-Encarboxylate By Reaction Of Diels-Alder","authors":"I. Kostiv, R. Havryliv","doi":"10.17721/moca.2019.208-215","DOIUrl":"https://doi.org/10.17721/moca.2019.208-215","url":null,"abstract":"Kinetics of the reaction of the cycloaddition of 2,3-dimethylbuta-1,3-diene (DMB) and methylmethacrylate (MMA) by the Diels-Alder reaction was studied. Reaction rate constants k = 4.4∙10-6 l/(mol∙s) at T = 403 K; k = 10.0∙10-6 l/(mol∙s) at T = 413 K; k = 15.8∙10-6 l/(mol∙s) at T = 423 K; k = 19.4∙10-6 l/(mol∙s) at T = 433 K and the activation parameters of the reaction Eakt = 75.2 kJ/mol, ΔS = -146.8 J/(mol∙K), ΔH = 73.9 kJ/mol were determined. Influence of temperature, molar ratio of reagents on the yield of the target product was investigated. At temperature increase from 403 to 433 K, methyl-1,3,4-trimethylcyclohex-3-encarboxylate (MTMCHC) yield increases from 78 % to 92 %. With further increase in temperature, DMB boils and MMA remains in a liquid state, accordingly it is not expected that the target product yield will materially increase. An increase in the excess of DMB: МMA from 1:1 to 2.5:1 makes it possible to increase yield of MTMCHC from 65 % to 92 %. The production of methyl-1,3,4-trimethylcyclohex-3-encarboxylate at the optimal conditions was established: temperature of 423−433 K and molar ratio of reagents DMB:MMA = 1.5:1, the yield of MTMCHC reaches 89−92 % at productivity of 101−105 g/(l·h). Based on the obtained reaction rate constants and the activation parameters of the [4+2]-cyclic addition of 2,3-dimethylbuta-1,3-diene and methylmethacrylate, it was found that the reaction under study is subject to the kinetic law of the second order.","PeriodicalId":18626,"journal":{"name":"Methods and Objects of Chemical Analysis","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67434935","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

Semiconductor Sensor With Loaded SnO2 Nanoparticles For Early Warning Of Indoor Fires 用于室内火灾预警的负载SnO2纳米颗粒半导体传感器

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Methods and Objects of Chemical Analysis Pub Date : 2019-01-01 DOI: 10.17721/MOCA.2019.37-42

Nelly Maksymovyc, L. Oleksenko, G. Fedorenko, Ganna Arinarkhova

引用次数: 2

Cement Quality Control By Using Modern Radiation Methods Of Chemical Analysis In The Process Of Its Production 现代辐射化学分析方法在水泥生产过程中的质量控制

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Methods and Objects of Chemical Analysis Pub Date : 2019-01-01 DOI: 10.17721/MOCA.2019.15-20

Y. Kuchirka, E. Volodarsky

{"title":"Cement Quality Control By Using Modern Radiation Methods Of Chemical Analysis In The Process Of Its Production","authors":"Y. Kuchirka, E. Volodarsky","doi":"10.17721/MOCA.2019.15-20","DOIUrl":"https://doi.org/10.17721/MOCA.2019.15-20","url":null,"abstract":"An essential part of modern quality management system in cement production is state-of-the-art radiation measurement technologies based on methods of neutron activation, X-ray fluorescence and X-ray diffraction chemical analysis of substance. The high speed and accuracy of measuring the characteristics of raw materials and finished products can be achieved by their complex application, thereby ensuring an improving in the level of automation of cement production and the quality of cement in general. The main stages of the portlandcement production process by dry method are considered, including the keypoints of quality control of their implementation by applying mentioned radiation methods of chemical analysis of raw materials and completed product. The metrological problems of their practical implementation in continuous cement production are analyzed, in particular problems of uncertainty assessment, static and dynamic calibration and increase of accuracy of measuring systems that implement neutron activation analysis methods. Shown the directions of their improvement by the use of alternative neutron sources, methods of Monte Carlo N-Particle Transport Code for neutron activation analysis physical processes simulation and machine learning for the efficient processing of spectral characteristics of investigated substances.","PeriodicalId":18626,"journal":{"name":"Methods and Objects of Chemical Analysis","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67434378","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