Physico-Chemical nanomaterials science

Application of Nano-functional silicas in extraction of vegetable raw materials
Raks V.1, Vasylchenko O.2, Myroniuk O.V.3, Sivolapov Р.V. 3
1Taras Shevchenko National University of Kyiv, Ukraine
2National Aviation University, Kyiv, Ukraine
3National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute” , Kyiv, Ukraine
E-mail: pavlo.sivolapov@gmail.com

Novel silica-based solid phase extraction (SPE) cartridges with surface-immobilized of polyoxyethylated isooctylphenolic, polyethylene glycol octadecyl ether and polyethylene glycol hexadecyl ether groups were tested for extraction of components from vegetable raw materials. According to differential thermal analysis data, the grafted layer of silica-based SPE - cartridges is stable in O2 flow up to 200 ºC. Its decomposition begins on exposure to O2 at 210–300 ºC. Silica-based SPE - cartridges with satisfactory densities (20-30 µmol·g-1) are thermally stable and can contribute to the materials, desirable for analytical application.  The purpose of the work was to analyze the methods used to find, isolate and identify polyol compounds from vegetable raw materials in recent years and compare with new approach using Nano-functional silicas.
Polyol compounds have a broad spectrum of action. They are used in the production of vitamin preparations, are involved in the regulation of intracellular calcium content, the transmission of hormonal signals, the catabolism of fats and the reduction of blood cholesterol, modulation of the activity of neurotransmitters. The most important biologically active polyol compounds are inositols. The main source from which inositols are derived is vegetable raw materials, namely alfalfa, as well as wheat sprouts, grapefruit, hazelnut and others. The paper deals with the extraction of polyols with organic and inorganic solvents, including in a Soxhlet apparatus, liquid pressure extraction, microwave extraction, and supercritical fluid extraction. The procedure of preliminary sample preparation and derivatization of polyols for their further separation and quantification is described. Modern chromatographic methods, that are used in the work with polyols, are analyzed. The possibility of using 1H nuclear magnetic resonance (NMR), 13C and 31P-NMR spectroscopy to identify the structure of polyol compounds, especially inositols, was demonstrated.