Rapid Determination of Edible Oils by Laser Desorption Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

KeyWord:laser desorption ionization  FTICR-MS  triacylglycerols  principal components analysis

Abstract:

      A fast and direct method was established for the qualitative analysis of triacylglycerols(TAGs) in edible oils using laser desorption ionization Fourier transform ion cyclotron resonance mass spectrometry(LDI-FTICR-MS).In the conditions of 45%laser power,100 Hz laser frequency and 100 laser shots,stable and repeatable signals with relative standard deviations(RSDs) less than 10%were obtained via this method.Using MS results and fragmented information,different kinds of edible oils could be directly distinguished from each other.34 different kinds of edible oils were clearly classified by principal component analysis(PCA) and clustering analysis at a confidence level of 95%.5%canola doped in olive could be identified directly using this method.In addition,according to the slopes of linear curves,which kinds of oil was doped in olive oil could be preliminarily predicted.These results indicated that LDI-FTICR-MS had the potential for rapid analyzing and screening edible oils.