TY - JOUR

T1 - Imidazolium Ionic Liquids in Microemulsion Electrokinetic Chromatography for Separation of Polyphenol Antioxidants

AU - Kartsova, Liudmila

AU - Moskvichev, Danil

AU - Bessonova, Elena

AU - Peshkova, Maria

N1 - Kartsova, L., Moskvichev, D., Bessonova, E. et al. Imidazolium Ionic Liquids in Microemulsion Electrokinetic Chromatography for Separation of Polyphenol Antioxidants. Chromatographia 83, 1001–1008 (2020). https://doi.org/10.1007/s10337-020-03921-z

PY - 2020/8/1

Y1 - 2020/8/1

N2 - Analytical prospects of ionic liquids as the components of the microemulsion for polyphenols separation by microemulsion electrokinetic chromatography are explored. Imidazolium-based hydrophilic ionic liquid 1-hexadecyl-3-methylimidazolium chloride was used as a surfactant and hydrophobic ionic liquids 1-hexyl-3-methylimidazolium tetrafluoroborate and 1-hexyl-3-methylimidazolium bis(trifluormethylsulfonyl)imide were used as the oil phase. It was shown that the addition of ionic liquids into the microemulsion leads to a significant increase in the number of theoretical plates for catechins separation (in the range 200–650 ×103) in both cases. It was established that the use of hydrophobic ionic liquids 1-hexyl-3-methylimidazolium tetrafluoroborate and 1-hexyl-3-methylimidazolium bis(trifluormethylsulfonyl)imide increases the sensitivity and selectivity of the polyphenols separation compared to 1-hexadecyl-3-methylimidazolium chloride. The following composition of microemulsion was found to be optimal for the selective electrophoretic separation of catechins with ionic liquids as the oil phase: 0.6% (w/v) sodium dodecyl sulphate, 0.7% (w/v) 1-hexyl-3-methylimidazolium tetrafluoroborate, 1.6% (w/v) 1-butanol, 5 mM phosphate buffer solution, pH = 7. The conditions for the electrophoretic separation of catechins with microemulsion electrokinetic chromatography were used to determine polyphenols in tea samples.

AB - Analytical prospects of ionic liquids as the components of the microemulsion for polyphenols separation by microemulsion electrokinetic chromatography are explored. Imidazolium-based hydrophilic ionic liquid 1-hexadecyl-3-methylimidazolium chloride was used as a surfactant and hydrophobic ionic liquids 1-hexyl-3-methylimidazolium tetrafluoroborate and 1-hexyl-3-methylimidazolium bis(trifluormethylsulfonyl)imide were used as the oil phase. It was shown that the addition of ionic liquids into the microemulsion leads to a significant increase in the number of theoretical plates for catechins separation (in the range 200–650 ×103) in both cases. It was established that the use of hydrophobic ionic liquids 1-hexyl-3-methylimidazolium tetrafluoroborate and 1-hexyl-3-methylimidazolium bis(trifluormethylsulfonyl)imide increases the sensitivity and selectivity of the polyphenols separation compared to 1-hexadecyl-3-methylimidazolium chloride. The following composition of microemulsion was found to be optimal for the selective electrophoretic separation of catechins with ionic liquids as the oil phase: 0.6% (w/v) sodium dodecyl sulphate, 0.7% (w/v) 1-hexyl-3-methylimidazolium tetrafluoroborate, 1.6% (w/v) 1-butanol, 5 mM phosphate buffer solution, pH = 7. The conditions for the electrophoretic separation of catechins with microemulsion electrokinetic chromatography were used to determine polyphenols in tea samples.

KW - Imidazolium ionic liquids

KW - Microemulsion

KW - Microemulsion electrokinetic chromatography

KW - Polyphenols

KW - GREEN TEA CATECHINS

KW - MODIFIERS

KW - SURFACTANTS

KW - CAFFEINE

KW - MEEKC

KW - BLACK

KW - CYCLODEXTRINS

KW - LIPOPHILICITY

UR - http://www.scopus.com/inward/record.url?scp=85087041361&partnerID=8YFLogxK

U2 - 10.1007/s10337-020-03921-z

DO - 10.1007/s10337-020-03921-z

M3 - Article

AN - SCOPUS:85087041361

VL - 83

SP - 1001

EP - 1008

JO - Chromatographia

JF - Chromatographia

SN - 0009-5893

IS - 8

ER -