Elucidations on the Structures of Some Putative Flavonoids identified in Post ‐Harvest Withered Grapes (V. vinifera L.) by Quadrupole/Time‐Of‐Flight Mass Spectrometry

AbstractGrape dehydration is an oenological process used for production of high ‐quality reinforced and sweet wines. High‐resolution mass spectrometry (UHPLC/QTOF) was used to deepen the characterization of some flavonoids previously proposed in Corvina and Raboso Piave withered grapes. By performing atargeted data analysis workflow and orthogonal identification approaches (MS/MS,in ‐silico fragmentation, calculation of putative retention time) elucidation on the structures of six compounds previously proposed, was achieved (taxifolin ‐pentoside, two tetrahydroxyflavanone‐hexoside derivatives, a tetrahydroxy‐dimethoxyflavanone‐hexoside derivative, a pentahydroxyflavone, and peonidin‐O‐pentoside), and the structures of four putative new grape flavonoids were characterized (dihydromyricetin‐O‐hexoside, taxifolin di‐O‐hexoside, isorhamnetin, a pinoquercetin isomer). Findings enlarge the panorama of flavonoids in grape and of their possible biosynthetic pathways.

Source: Journal of Mass Spectrometry - August 3, 2020 Category: Chemistry Authors: Mirko De Rosso, Annarita Panighel, Antonio Dalla Vedova, Riccardo Flamini Tags: SPECIAL ISSUE ‐ RESEARCH ARTICLE Source Type: research