Microfluidic Chip-Based Induced Phase Separation Extraction as a Fast and Efficient Miniaturized Sample Preparation Method

Yao Shen, Bo Chen, Han Zuilhof, Teris A. van Beek*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Induced phase separation extraction (IPSE) is an efficient sample clean-up technique that can replace liquid-liquid extraction (LLE). The purpose of this study was to miniaturize IPSE by carrying it out in a microfluidic chip. An IPSE chip was designed and evaluated for its ability to separate and purify samples on a microscale. The 5 × 2 cm chip was fed with a solution of polar to non-polar model compounds in acetonitrile-water (1:1). In the 100 µm wide and 40 µm deep microchannels, the sample solution was efficiently separated into two immiscible phases by adding a hydrophobic solvent as inducer. Analytes present in the sample solution each migrated to their own favorable phase upon phase separation. After optimization, extraction and fractionation were easily and efficiently achieved. The behavior of analytes with a pH-dependent partitioning could be influenced by adjusting the pH of the sample solution. Scutellaria baicalensis extract, used in Traditional Chinese Medicine (TCM), was successfully separated in aglycones and glycosides. In this microscale system, the sample and solvent consumption is reduced to microliters, while the time needed for the sample pretreatment is less than one minute. Additionally, the extraction efficiency can reach up to 98.8%, and emulsion formation is avoided.

Original languageEnglish
JournalMolecules (Basel, Switzerland)
Volume26
Issue number1
Early online date23 Dec 2020
DOIs
Publication statusPublished - 2021

Keywords

  • fast sample clean-up
  • green analytical chemistry
  • IPSE
  • low solvent consumption
  • microfluidics
  • miniaturization
  • on-chip separation
  • Scutellaria baicalensis
  • TCM
  • μLPME

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