name
Prudnikov Sergey Mikhailovich
Scholastic degree
•
Academic rank
professor
Honorary rank
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Organization, job position
• Krasnodar Research Institute of Agricultural Products Storage and Processing
главный научный сотрудник отдела контроля качества и стандартизации
Research interests
Разработка экологически безопасных экспресс-способов оценки качества и идентификации растительного сырья и продуктов его переработки, в том числе с применением метода ядерно-магнитной релаксации
Web site url
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Current rating (overall rating of articles)
0
TOP5 co-authors
Articles count: 3
Сформировать список работ, опубликованных в Научном журнале КубГАУ
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Description
To determine the mass fraction of linolenic acid in flax seed oil the authors developed a rapid method based on the pulse method of nuclear magnetic resonance with the use of NMR analyzers low resolution. This method has some significant advantages compared with the known method on the basis of chromatographic method for the determination of the mass fraction of linolenic acid in the oil extracted from the seeds of flax, namely, does not require additional sample preparation (extracting oil by solvent), eliminates the use of toxic chemicals, requires a much lower investment of time to conduct a single analysis, highly automated, and eliminates the influence of human factor on the research results. The method is based on the revealed correlation between the weighted average time spin-spin relaxation of protons contained in the triacylglycerols of the oil of the flax seed, and a mass fraction of linolenic acid in the seed oil at a temperature of 23ºc. In article results of research of influence of temperature on the weighted average time spin-spin relaxation of protons contained in the flax seed oil. Installed directly proportional linear relationship between the temperature of flax seeds and measured the average time spin-spin relaxation of protons oil contained in the flax seeds with the correlation coefficient is 0,930, the temperature change of the sample of seeds at 1 ° C leads to the change of the coefficient is 0.011 kt. The developed methodaccuracy in the temperature range from 20 to 26 ºC
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DEVELOPMENT OF ECOLOGICALLY SAFE EXPRESS-METHOD FOR QUALITY EVALUATION OF SOYBEAN LECITHINS
Description
The article presents data, on the basis of which we have concluded that the oil and phospholipids contained in soy lecithins, the degree of unsaturation of fatty acids differ significantly from oil and phospholipids contained in sunflower lecithins, with differences in the degree of unsaturation of fatty acids of oil and phospholipids contained in sunflower and soy lecithins, leads to differences in the content of resonating protons, and, consequently, the level of amplitude values of NMR signals of protons of the investigated lecithins. It is established that the values of the amplitudes of the NMR signals of protons of each of the four components of sunflower lecithins differ from the values of the amplitudes of the NMR signals of protons the component of soy lecithins, which confirms the differences in the composition and content of fatty acids lecithins studied. Considering quantitative characteristic of mass fraction of substances insoluble in acetone, i.e. phospholipids, is the sum of the amplitudes of the NMR signals of protons of the third (A3) and fourth (A4) component, was built the graphical dependence of the mass fraction of substances insoluble in acetone, from the value of (A3+A4)/ASIS, % which is described by the equation (correlation coefficient R2 =0,9911) of the following form: y=0,8177x +2.52. Based on these data, we have developed a rapid method of determining the mass fraction of substances insoluble in acetone, soy lecithin, eliminating the use of toxic organic solvents, is environmentally safe, which is protected by RF patent for the invention
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Description
In recent decades, Russia has increased the demand for high oleic sunflower oil and, consequently, for the raw material from which it is derived – high oleic sunflower seeds. Currently existing methods of control of mass fraction of oleic acid in the seed oil of sunflower, have significant drawbacks, due to which sharply raises the question of the development of the Express methods of control of mass fraction of oleic acid. The study presents the results of determining the mass fraction of oleic acid in the oil of sunflower seeds, obtained by known methods (GC and ri), and developed a method based on NMR. The developed method of determining the mass fraction of oleic acid in sunflower seed oil has a number of advantages compared with the known: is not destructive (does not require the extraction of oil from seeds), does not require special sample preparation excludes the use of toxic chemicals, the analysis duration is 5 minutes, ensuring high representativeness of the sample, and the simplicity and automation of the analysis process reduces the requirements for qualifications of laboratory personnel. The developed method of determining the mass fraction of oleic acid in the oil of sunflower seeds can be carried out simultaneously with the determination of oil and moisture content of seeds on commercially available analyzers, but I hope it 1006М, which is currently applied at more than 250 companies of oil and fat industry
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