тонкослойная хроматография

Thin-layer chromatography (TLC) has been used to study the infl uence of a number of factors (the nature of the stationary phase, the nature and concentration of the organic solvents and surfactants, the pH of the buff er solution) on the chromatographic characteristics of B vitamins: B1 (thiamine), B6 (pyridoxine), B12 (cyanocobalamin). The stationary phases were plates with polar (Sorbfi l on a polymer (highperformance plates, HTLC) and aluminum substrates), weakly polar (Polyamide-6), and nonpolar (RP-18 on an aluminum substrate) sorbents.

The influence of a number of factors on the chromatographic properties of statins (atorvastatin, rosuvastatin, simvastatin) in normal-phase and reverse-phase chromatography modes has been studied by the method of the thin-layer chromatography (TLC) in order to select the most effective analytical systems for the total and separate determination of statins in pharmaceuticals. The study has been performed by ascending TLC on commercial plates with polar, weakly polar, and nonpolar phases.

The results of the study of the influence of various surfactants, cyclodextrins, and ions of Europium on the antibiotics separation according to the method of the thin layer chromatography in medical products are presented.

Методом тонкослойной хроматографии изучены хроматографические свойства некоторых антиоксидантов полифенольной природы – кверцетина и рутина – в циклодекстриновых подвижных фазах при варьировании природы неподвижной фазы, природы и концентрации циклодекстринов, а также природы и концентрации модификаторов циклодекстриновых подвижных фаз (органического растворителя и сильного электролита). Найдены оптимальные хроматографические системы и условия их применения в ТСХ исследуемых флавоноидов.

Методом тонкослойной хроматографии изучены хроматографи-
ческие свойства лекарственных препаратов кортикостероидных
гормонов в водно-органических, циклодекстриновых и мицел-
лярных подвижных фазах при варьировании природы неподвиж-
ной фазы, природы и концентрации растворителя в подвижной
фазе, природы и концентрации циклодекстринов и поверхност-
но-активных веществ. Найдены оптимальные хроматографиче-
ские системы и условия их применения в ТСХ кортикостероидов.
Полученные результаты подтверждены методом ВЭЖХ.
 

A comprehensive method for meldonium analysis, based on a combination of magnetic solid-phase concentration of the analyte on magnetite nanoparticles modified with cetylammonium bromide (CTAB) cations and its subsequent analysis by thin-layer chromatography (TLC) were developed in the process of study. The influence of a number of factors on meldonium sorption was studied, namely: pH, sorbent mass, sorption and mixing times; optimal extraction conditions were determined.