-
Article
Characteristics of the Anomalous Temperature Dependence of Gas Chromatographic Retention Indices of Polar Compounds on Packed Columns with a Nonpolar Phase
Anomalies observed earlier in the gas chromatographic indices of retention (RIs) of polar compounds (e.g., dimethylformamide) in nonpolar capillary columns are confirmed for packed columns. The anomalies consi...
-
Article
Headspace Gas Chromatographic Analysis of Volatile Components of Common Tansy (Tanacetum vulgare L.) and Its Preparations
Direct headspace gas chromatographic analysis with flame ionization and mass spectrometric detection was used to identify and quantify volatile organic compounds (VOCs) in the headspace of the medicinal plant ...
-
Article
Planar microchromatographic columns for gas chromatography
The adsorption and selective properties of aluminum-based planar microcolumns filled with the Carbopack B adsorbent are studied. The effect of geometrical parameters of the columns on their chromatographic pro...
-
Article
Gas chromatography parameters of volatile compounds in growths and pharmaceuticals of Milk Thistle (Silybum marianum L.)
Based on a gas chromatography investigation of volatile compounds in growths and pharmaceuticals of Milk Thistle (Silybum marianum L.), chances for the assessment of the identity of raw materials and fitodrug wer...
-
Article
Subcritical water extraction of biologically active substances from milk thistle seed (Silybum murianum L.)
A method of subcritical water extraction (SCWE) of biologically active substances from milk thistle seed (Silybum marianum L.) that makes it possible to obtain aqueous extracts without using organic solvents is s...
-
Article
New methods for determining the volumetric flow rate in the column and the retention time of the unretained substance in gas chromatography
New methods for calculating the mean volumetric flow rate of the carrier gas and the retention time of the unretained substance in the column under conditions of gas chromatography were proposed. The methods a...
-
Article
Influence of flow parameters of the mobile phase on the retention and thermodynamic characteristics of sorption in gas-liquid chromatography
The influence of the flow parameters of the mobile phase (flow rate and mean pressure in the column) on the retention and thermodynamic characteristics of sorption in gas-liquid chromatography is studied exper...
-
Article
Analysis of Mixtures Containing Unknown Components by Gas Chromatography: Determination of Molecular Mass
New methods are proposed for the gas-chromatographic determination of the molecular masses of unknown components in complex mixtures within one cycle of analysis. The methods are based on the use of complex ch...
-
Article
Averaging the pressure and flow rate of the carrier gas in a gas chromatographic column
A systematic derivation of corresponding equations shows that averaging the pressure and the flow rate of the mobile phase in a gas chromatographic column over the column length and over the time that an unret...
-
Article
Chromatographic determination of solvent composition in deoiling and dewaxing processes
A rapid method has been developed and recommended for use in refinery laboratories, for the analysis of solvents used in deoiling and dewaxing processes; the instrument used in this analysis is a USSR-manufact...
-
Article
Catalytic combustion detector for chromatographic analysis of flue gases
