Orthogonality and Quality of GC × GC Separations for Complex Samples with Ionic Liquid Stationary Phases in First Dimension

2018 ◽  
Vol 82 (2) ◽  
pp. 615-624 ◽  
Author(s):  
M. V. Shashkov ◽  
V. N. Sidelnikov
Keyword(s):  
Ionic Liquid ◽  
Stationary Phases ◽  
Complex Samples

Separation of Fatty Acid Dimethyl Esters on an Ionic Liquid Gas Chromatographic Column

2020 ◽  
Author(s):  
R E Pauls ◽  
B Pease
Keyword(s):  
Ionic Liquid ◽  
Fatty Acid ◽  
Stationary Phases ◽  
Carbon Number ◽  
Fatty Acid Esters ◽  
Reaction Products ◽  
Isomer Separation ◽  
Metathesis Reaction ◽  
Polydimethyl Siloxane ◽  
Acid Esters

Abstract An ionic liquid (IL) 111 column was compared with other commonly employed stationary phases including polydimethyl siloxane and polyethylene glycol for the separation of fatty acid monomethyl and dimethyl esters. The fatty acid esters employed in this study were derived from metathesis reactions of vegetable oils both with and without olefins. The IL 111 column demonstrated enhanced performance compared with conventional columns for the separation of these esters. These advantages included significantly enhanced retention of dimethyl esters relative to monomethyl esters, excellent cis/trans isomer separation and the ability to analyze higher carbon number dimethyl esters. As a result, these columns are highly suited for the analysis of mixtures of mono- and dimethyl fatty acid esters found in lipid metathesis reaction products or to determine monofunctional impurities in samples of commercial dimethyl esters.

Application of Mobile Phases Containing Ionic Liquid for HPLC Analysis of Selected Isoquinoline Alkaloids

2017 ◽  
Vol 100 (6) ◽  
pp. 1652-1659 ◽  
Author(s):  
Anna Petruczynik ◽  
Justyna Misiurek ◽  
Tomasz Tuzimski ◽  
Monika Waksmundzka-Hajnos
Keyword(s):  
Ionic Liquid ◽  
Stationary Phases ◽  
Reversed Phase ◽  
System Efficiency ◽  
Organic Modifier ◽  
Optimal Conditions ◽  
Retention Behavior ◽  
Isoquinoline Alkaloids ◽  
Mobile Phases ◽  
Chemical Groups

Abstract An HPLC procedure on a polar reversed-phase column with mobile phases containing ionic liquid (IL) was developed for the analysis of selected alkaloids from different chemical groups. We aimed to obtain optimal conditions for the separation of alkaloids because widely used silica-based stationary phases exhibit a silanol effect, rendering analysis of basic analytes extremely difficult. Retention, separation selectivity, peak symmetry, and system efficiency were examined in various eluent systems containing different concentrations of IL and acetonitrile. The obtained results revealed substantial influence from the concentrations of IL, the organic modifier, and temperature on the retention behavior of the investigated alkaloids. The most selective and efficient chromatographic systems were applied for the analysis of several alkaloids in a plant extract.

Preparation of monodisperse porous polymeric ionic liquid microspheres and their application as stationary phases for HPLC

Talanta ◽  
2020 ◽  
Vol 208 ◽  
pp. 120462 ◽  
Author(s):  
Qiaohong Peng ◽  
Yue Wu ◽  
Hailin Cong ◽  
Youqing Shen ◽  
Khalid Mahmood ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Stationary Phases ◽  
Polymeric Ionic Liquid

Collection and identification of an unknown component from Eugenia uniflora essential oil exploiting a multidimensional preparative three-GC system employing apolar, mid-polar and ionic liquid stationary phases

2019 ◽  
Vol 218 ◽  
pp. 101-114 ◽  
Author(s):  
Danilo Sciarrone ◽  
Antonino Schepis ◽  
Gemma De Grazia ◽  
Archimede Rotondo ◽  
Filippo Alibrando ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Essential Oil ◽  
Structure Elucidation ◽  
Stationary Phases ◽  
Eugenia Uniflora ◽  
Unknown Component

MDGC-Prep is used in combination with NMR, GC-FTIR and GC-MS analyses for the structure elucidation of an unknown component from Eugenia uniflora L. essential oil.

scholarly journals Pressure-Driven Micro-Casting for Electrode Fabrication and Its Applications in Wear Grain Detections

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3710 ◽  
Author(s):  
E Cheng ◽  
Ben Xing ◽  
Shanshan Li ◽  
Chengzhuang Yu ◽  
Junwei Li ◽  
...  
Keyword(s):  
Microfluidic Device ◽  
Microelectrode Array ◽  
Engine Oil ◽  
Width Ratio ◽  
Biological Applications ◽  
Robust Method ◽  
Complex Samples ◽  
Abrasive Particles ◽  
Electrode Fabrication

The microelectrode is an essential and vital part in microsensors that are largely used in industrial, chemical, and biological applications. To obtain desired microelectrodes in great quality, it is also of great necessity and significance to develop a robust method to fabricate the microelectrode pattern. This work developed a four-terminal differential microelectrode that aims at recognizing microparticles in fluids. This microelectrode pair consisted of a high height–width ratio microelectrode array fabricated using a pre-designed microelectrode pattern (a micro-scale channel) and melted liquid metal. The surface treatment of microelectrodes was also investigated to reveal its impacts on the continuality of melting metal and the quality of the fabricated microelectrode patterns. To evaluate the performance of micro-casting fabricated electrodes, a microfluidic device was packaged using a microelectrode layer and a flow layer. Then impedance cytometer experiments were performed using sample fluids with polymer particles in two different sizes in diameter (5 μm and 10 μm). In addition, engine oil was tested on the microelectrodes as complex samples. The number of abrasive particles in the engine oil can be collected from the developed microfluidic device for further analysis.

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