Practical considerations for preparing polymerized phospholipid bilayer capillary coatings for protein separations

Seid M. Adem, Elisabeth Mansfield, John P. Keogh, Henry K. Hall, Craig A. Aspinwall

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Phosphorylcholine (PC) based phospholipid bilayers have proven useful as capillary coating materials due to their inherent resistance to non-specific protein adsorption. The primary limitation of this important class of capillary coatings remains the limited long-term chemical and physical stability of the coatings. Recently, a method for increasing phospholipid coating stability in fused silica capillaries via utilization of polymerized, synthetic phospholipids was reported. Here, we expand upon these studies by investigating polymerized lipid bilayer capillary coatings with respect to separation performance including run-to-run, day-to-day and column-to-column reproducibility and long-term stability. In addition, the effects of pH and capillary inner diameter on polymerized phospholipid coated capillaries were investigated to identify optimized coating conditions. The coatings are stabilized for protein separations across a wide range of pH values (4.0-9.3), a unique property for capillary coating materials. Additionally, smaller inner diameter capillaries (≤50. μm) were found to yield marked enhancements in coating stability and reproducibility compared to wider bore capillaries, demonstrating the importance of capillary size for separations employing polymerized phospholipid coatings.

Original languageEnglish (US)
Pages (from-to)93-98
Number of pages6
JournalAnalytica Chimica Acta
Volume772
DOIs
StatePublished - Apr 15 2013

Keywords

  • Bis-SorbPC
  • Capillary coating
  • Phospholipids
  • Polymerized lipid bilayer

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

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