Amphiphilic selectivity of guanidinium-based ionic liquid stationary phase for structural and positional isomers

The investigated GBIL stationary phase exhibits high selectivity for a wide ranging polarity of analytes and shows advantages over the conventional polar stationary phase.

An in situ growth approach to the fabrication of zeolite imidazolate framework-90 bonded capillary column for gas chromatography separation

Zeolite imidazolate framework-90 (ZIF-90) bonded capillary column was fabricated via an in situ growth approach. The prepared ZIF-90 bonded capillary column acts as a weak polar stationary phase and gave baseline separation of apolar and polar compounds.

Essential Oil of Flowers of Anaphalis contorta, an Aromatic and Medicinal Plant from India

The hydro-distilled essential oil of dried flowers of Anaphalis contorta Hook f. has been examined by means of gas chromatography-mass spectrometry (GC- MS). The oil constituents were identified according to their mass spectra and their relative retention indices determined on a non-polar stationary phase capillary column. Fifty-one constituents have been identified representing 97.0% of the total oil. The major constituents were β-caryophyllene (19.2%), γ- curcumene (17.5%), δ-cadinene (10.2%), labda-7,14-dien-13-ol (4.8%), epi-α-cadinol (4.3%), bulnesol (4.3%), α-cadinol (3.8%), β-bisabolol (3.7%) and labda-8,14-dien-13-ol (3.3%). The oil was rich in sesquiterpene hydrocarbons (60.5%), followed by oxygenated sesquiterpenes (26.6%), oxygenated diterpenes (8.1%) and diterpene hydrocarbons (1.8%).