Direct flow injection profiling of acyl glycerols from food products using isopropanol as solvent.

This work proposes a novel method for the direct flow injection profiling of acyl glycerols in edible oils and fats without preliminary extraction and consequent reconstitution in the injection solvent. The work exploits the outstanding performance of high-resolution mass spectrometry to target unique elemental compositions even in the most complex matrices. The performance of isopropanol as the unique solvent for both the solubilization and analysis of acyl glycerols was investigated in comparison with other classical methods involving preliminary extractions, sample recovery and analysis. The calibrations of two triglyceride standards (triolein and trilinolenin) were successfully performed in presence and absence of oil matrix. As final application, the effects on the acyl glycerol fraction of a heat treatment on three different fat samples (extra virgin olive oil, lard oil and fat from dry cured ham - speck) were monitored. The proposed method is therefore suitable for a rapid evaluation of acyl glycerol fractions in food lipid samples.