The authors of this study (purchase required) used an untargeted chemometric screening approach, LC-Q-Orbitrap MS analysis, to identify discriminatory markers between organic and conventional milks. Putative markers were then verified by targeted analysis. In the targeted strategy, they used UPLC-MS/MS to quantify three markers. They propose the peptide of Thr-Ala-Val and D-biotin as distinguishing markers for organic, vs conventional, Jersey milk. They propose trimethylamine N-oxide as a metabolite marker for organic, vs conventional, Yak milk. They do not state which aspect of husbandry differences might be responsible for differences in these markers.
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