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Updated: Apr 23, 2026

The Terroir Concept Interpreted through Grape Berry Metabolomics and Transcriptomics
Published on: October 5, 2016
Study of isobaric grape seed proanthocyanidins by MALDI-TOF MS
Fabiola De Marchi1, Roberta Seraglia, Laura Molin
1CRA-VIT, Viale XXVIII aprile 26, 31015, Conegliano, Treviso, Italy.
Abstract:
Positive matrix-assisted laser desorption ionization (MALDI) spectra of grape seed raw extracts show the signals of putative proanthocyanidin (PA) oligomers, including those of several sodium and potassium adducts with the same nominal molecular weight. As a result, the MALDI time-of-flight profiles are characterized by several isobaric signals from different PAs. The presence of isobaric PA adducts was studied by sodium and potassium exchange experiments on the seed extracts of six grape varieties. This approach was effective in differentiating PAs with isobaric signals, and 15 different PAs were identified in the MALDI spectra of all samples.
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