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

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A Correction to this article was published on 04 June 2018

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Abstract

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.

Separation of fatty acid methyl esters on a 30-m 3m2C5(mpy)2. 2NTf2 branched-chain dicationic IL-based column. Branched chain dicationic ILs show great selectivity for separation of cis/trans, ω-3/ω-6, and detailed analysis of cis/trans fats.

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Change history

  • 04 June 2018

    The authors would like to call the reader’s attention to the fact that the original publication included some corrections needed to be addressed.

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Acknowledgements

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.

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Authors and Affiliations

  1. Department of Chemistry and Biochemistry, University of Texas at Arlington, 700 Planetarium place, Arlington, TX, 76019, USA

    Mohsen Talebi, Rahul A. Patil & Daniel W. Armstrong

  2. MilliporeSigma, Bellefonte, PA, 16823, USA

    Leonard M. Sidisky

  3. Institut des Sciences Analytiques, Université de Lyon 1, CNRS, 5 rue de la Doua, 69100, Villeurbanne, France

    Alain Berthod

Authors
  1. Mohsen Talebi
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  2. Rahul A. Patil
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  3. Leonard M. Sidisky
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  4. Alain Berthod
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  5. Daniel W. Armstrong
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Corresponding author

Correspondence to Daniel W. Armstrong.

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Conflict of interest

All the authors declare that they have no conflict of interest. The commercial SLB-IL111 and SP-2560 columns were provided by MilliporeSigma and Leonard M. Sidisky is an employee of MilliporeSigma.

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This article does not contain any studies with human or animal subjects.

Additional information

Published in the topical collection Ionic Liquids as Tunable Materials in (Bio)Analytical Chemistry with guest editors Jared L. Anderson and Kevin D. Clark.

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Talebi, M., Patil, R.A., Sidisky, L.M. et al. Branched-chain dicationic ionic liquids for fatty acid methyl ester assessment by gas chromatography. Anal Bioanal Chem 410, 4633–4643 (2018). https://doi.org/10.1007/s00216-017-0722-y

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  • DOI: https://doi.org/10.1007/s00216-017-0722-y

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