Branched-chain dicationic ionic liquids for fatty acid methyl ester assessment by gas chromatography

Autor: Daniel W. Armstrong, Mohsen Talebi, Rahul A. Patil, Alain Berthod, Leonard M. Sidisky
Přispěvatelé: Dept Chem & Biochem, University of Texas at Arlington [Arlington], MilliporeSigma, Chromatography & Hyphenated Techniques - Chromatographie et techniques couplées, Institut des Sciences Analytiques (ISA), Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), The authors thankfully acknowledge financial support from the Welch Foundation (Y0026). A. Berthod thanks the French Centre National de la Recherche Scientifique (CNRS ISA UMR5180) for continuous support.
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Analytical and Bioanalytical Chemistry
Analytical and Bioanalytical Chemistry, Springer Verlag, 2018, 410 (19), pp.4633-4643. ⟨10.1007/s00216-017-0722-y⟩
ISSN: 1618-2642
1618-2650
DOI: 10.1007/s00216-017-0722-y⟩
Popis: Twelve bis- or dicationic ionic liquids (ILs) including eight based on imidazolium, a single one based on phosphonium, and three based on pyrrolidinium cationic units were prepared with the bis(trifluoromethyl sulfonyl) imide anion. The two identical cationic moieties were attached by different alkyl spacers having three or five carbons and differing alkyl substituents attached to the spacer. The SLB-IL111 column, as the most polar commercial stationary phase known, was included in the study for comparison. Isothermal separations of a rapeseed oil fatty acid methyl ester (FAME) sample were used to study and compare the 12 IL-based column performances and selectivities. The retention times of the most retained methyl esters of lignoceric (C24:0) and erucic (C22:1) acids were used to estimate the IL polarity. The phosphonium dicationic IL column was, by far, the least polar. Imidazolium-based dicationic IL columns were the most polar. Polarity and selectivity for the FAME separation were somewhat related. The separation of a 37-FAME standard mixture allowed the investigation of selectivity variations observed on the 12 IL-based columns under temperature gradients up to 230 °C. The remarkable selectivity of the IL-based columns is demonstrated by the detailed analysis of the cis/trans C18:1 isomers of a partially hydrogenated vegetable oil sample on 30-m columns, separations competing with that done following an "official method" performed on a 100-m column. Graphical abstract Separation of fatty acid methyl esters on a 30-m 3m
Databáze: OpenAIRE
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