^#.^t6: Ionic Liquid Additives to Mobile Phases

2013 ◽  
pp. 112-125
Keyword(s):  
Ionic Liquid ◽  
Mobile Phases

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.

scholarly journals Flavonoids in Different Parts of Lysimachia clethroides Duby Extracted by Ionic Liquid: Analysis by HPLC and Antioxidant Activity Assay

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Jin-feng Wei ◽  
Zhi-juan Zhang ◽  
Li-li Cui ◽  
Wen-yi Kang
Keyword(s):  
Antioxidant Activity ◽  
Ionic Liquid ◽  
Phosphoric Acid ◽  
Ultrasound Assisted Extraction ◽  
Column Temperature ◽  
Extraction Solvent ◽  
Mobile Phases ◽  
Assisted Extraction ◽  
Lysimachia Clethroides ◽  
Optimized Conditions

To establish methods for simultaneous determination of isoquercitrin, astragalin in leaves, quercetin, and kaempferol in flowers of Lysimachia clethroides Duby, respectively, the methods were ultrasound-assisted extraction combined with RP-HPLC, and ionic liquid was used as the extraction solvent. Meanwhile, the antioxidant activity of the different extracts of L. clethroides was evaluated. Purospher STAR RP-C18 column (4.6 mm × 250 mm, 5 μm) was used for analysis. The flow rate was 0.6 mL·min−1, and the column temperature was 25°C. The detection wavelength was 360 nm. The mobile phases a and b consisted of acetonitrile-0.4% phosphoric acid (18 : 82, v/v), methanol (A), and 0.4% phosphoric acid (B), respectively. Linear ranges were 0.068~1.64, 0.060~1.44, 0.0080~0.19, and 0.0077~0.18 μg for isoquercitrin, astragalin, quercetin, and kaempferol, respectively. The average recoveries of the four constituents were 99.17%, 98.39%, 100.68%, and 98.81%, respectively. The antioxidant activity of the extracts was detected by DPPH, ABTS, and FRAP. Under the optimized conditions, all the test solutions showed a certain antioxidant activity and the ionic liquid extracts were better than that of extract of methanol. Ionic liquid used as the extraction solvent had the potential to extract active ingredients efficiently from L. clethroides, and this method improved the antioxidant activity with accurate and reliable results.

Liquid chromatography with alkylammonium formate ionic liquid mobile phases and fluorescence detection

2018 ◽  
Vol 1559 ◽  
pp. 128-135 ◽  
Author(s):  
Neil D. Danielson ◽  
Fotouh R. Mansour ◽  
Ling Zhou ◽  
Casey V. Connell ◽  
Erin M. Dotlich ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Liquid Chromatography ◽  
Fluorescence Detection ◽  
Mobile Phases

Soft ionic liquid based resistive memory characteristics in a two terminal discrete polydimethylsiloxane cylindrical microchannel

2020 ◽  
Vol 8 (38) ◽  
pp. 13368-13374
Author(s):  
Muhammad Umair Khan ◽  
Gul Hassan ◽  
Jinho Bae
Keyword(s):  
Ionic Liquid ◽  
Acrylic Acid ◽  
Sodium Hydroxide ◽  
Sodium Salt ◽  
Resistive Memory ◽  
Cylindrical Microchannel ◽  
Memory Characteristics ◽  
Poly Acrylic Acid

This paper proposes a novel soft ionic liquid (IL) electrically functional device that displays resistive memory characteristics using poly(acrylic acid) partial sodium salt (PAA-Na+:H2O) solution gel and sodium hydroxide (NaOH) in a thin polydimethylsiloxane (PDMS) cylindrical microchannel.

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