Recent Applications of Mass Spectrometry in the Study of Grape and Wine Polyphenols

Figure 6

Collisionally induced fragmentation patterns of [M−H]⁻ ions of trans-resveratrol at 𝑚/𝑧 227 (compound 1) considering that the deprotonation reaction occurred on the phenol moiety (Scheme 1a), and of [M−H]⁻ ions of trans-resveratrol (R = H, compound 1) and piceatannol at 𝑚/𝑧 243 (R = OH, compound 2) considering that the deprotonation reaction occurred on the resorcinol moiety (Scheme 1b), [25].