Faster Protocol for Endogenous Fatty Acid Esters of Hydroxy Fatty Acid (FAHFA) Measurements

Research output: Contribution to journalArticle


Fatty acid esters of hydroxy fatty acids (FAHFAs) are a recently discovered class of endogenous lipids with antidiabetic and anti-inflammatory activities. Interest in these lipids is due to their unique biological activites and the observation that insulin-resistant people have lower palmitic acid esters of hydroxystearic acid (PAHSA) levels, suggesting that a FAHFA deficiency may contribute to metabolic disease. Rigorous testing of this hypothesis will require the measurement of many clinical samples; however, current analytical workflows are too slow to enable samples to be analyzed quickly. Here we describe the development of a significantly faster workflow to measure FAHFAs that optimizes the fractionation and chromatography of these lipids. We can measure FAHFAs in 30 min with this new protocol versus 90 min using the older protocol with comparable performance in regioisomer detection and quantitation. We also discovered through this optimization that oleic acid esters of hydroxystearic acids (OAHSAs), another family of FAHFAs, have a much lower background signal than PAHSAs, which makes them easier to measure. Our faster workflow was able to quantify changes in PAHSAs and OAHSAs in mouse tissues and human plasma, highlighting the potential of this protocol for basic and clinical applications.


  • Matthew J. Kolar
  • Andrew T. Nelson
  • Tina Chang
  • Meric Erikci Ertunc
  • Mitchell P. Christy
  • Lena Ohlsson
  • Magnus Härröd
  • Barbara B. Kahn
  • Dionicio Siegel
  • Alan Saghatelian
External organisations
  • University of California, San Diego
  • Beth Israel Deaconess Medical Center
  • Salk Institute for Biological Studies
  • Harvard University
  • Härröd Research AB
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Medicinal Chemistry
Original languageEnglish
Pages (from-to)5358-5365
Number of pages8
JournalAnalytical Chemistry
Issue number8
Publication statusPublished - 2018 Apr 17
Publication categoryResearch