4 research outputs found
New insights into the search of meat quality biomarkers assisted by Orbitrap Tribrid untargeted metabolite analysis and chemometrics
Metabolite profiles of normal and defective dry, firm and dark (DFD) meat extracts with known ultimate pH
(pHu) values were determined by Orbitrap Tribrid ID-X untargeted analysis coupled to chemometrics. An
intelligent MS3 AcquireXTM workflow firstly approached the unambiguous characterization of detected features
that were subsequently quantified by a complementary MS1 study of biological replicates. Chemometric research
revealed how threonylphenylalanine (overexpressed in normal meats) together to tetradecadienoyl- and
hydroxydodecanoyl-carnitines (both overexpressed in DFD meats) appropriately grouped meat groups assayed.
Robustness of such biomarkers was confirmed through a time-delayed study of a blind set of samples (unknown
pHu) and evidenced limitations of pHu as an isolated parameter for accurate meat quality differentiation. Other
acyl-carnitines also characterized DFD samples, suggesting interferences induced by pre-slaughter stress (PSS) on
lipid catabolism that would explain accumulation of such intermediate metabolites. Results achieved can ease
understanding of biochemical mechanisms underlying meat quality defects