title: Evaluation of a gas chromatography method for azelaic acid determination in selected biological samples.
abstract: BACKGROUND
  Azelaic acid (AzA) is the best known dicarboxilic acid to have pharmaceutical benefits and clinical applications and also to be associated with some diseases pathophysiology.
  
  
  METHODS
  We extracted and methylesterified AzA and determined its concentration in human plasma obtained from healthy individuals and also in mice fed AzA containing diet for three months.
  
  
  RESULTS
  AzA was detected in Gas Chromatography (GC) and confirmed by Liquid chromatography mass spectrometry (LCMS), and gas chromatography mass spectrometry (GCMC). Our results have shown that AzA can be determined efficiently in selected biological samples by GC method with 1nM limit of detection (LoD) and the limit of quantification (LoQ); was established at 50nM. Analytical Sensitivity as assayed by hexane demonstrated an analytical sensitivity at 0.050nM. The method has demonstrated 8-10% CV batch repeatability across the sample types and 13-18.9% CV for the Within-Lab Precision analysis. The method has shown that AzA can efficiently be recovered from various sample preparation including liver tissue homogenate (95%) and human plasma (97%).
  
  
  CONCLUSIONS
  Because of its simplicity and lower limit of quantification, the present method provides a useful tool for determining AzA in various biological sample preparations.
authors.affiliation: Department of Laboratory and Nutritional Sciences, University of Massachusetts, Lowell, MA, USA.
authors.forename: Mahdi
authors.initials: M
authors.lastname: Garelnabi
authors.forename: Dmitry
authors.initials: D
authors.lastname: Litvinov
authors.forename: Sampath
authors.initials: S
authors.lastname: Parthasarathy