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

Table 1

LC retention times (RTs), maximum adsorption UV-Vis wavelengths, and mass spectra data of flavonols identified in Petit Verdot grape skins.

Flavonol	HPLC RT (min)	𝜆max (nm)	[M − H]^+ and product ion (m/z)
Myricetin-3-glucuronide	13.9	257(sh), 261, 301(sh), 353	495, 319
Myricetin-3-glucoside	14.5	257(sh), 262, 298(sh), 355	481, 319
Quercetin-3-glucuronide	18.0	257, 265(sh), 299(sh), 354	479, 303
Quercetin-3-glucoside	18.8	256, 265(sh), 295(sh), 354	465, 303
Laricitrin-3-glucoside	19.9	256, 265(sh), 301(sh), 357	495, 333
Kaempferol-3-glucoside	22.6	265, 298(sh), 320(sh), 348	449, 287
Isorhamnetin-3-glucoside	24.3	255, 265(sh), 297(sh), 354	479, 317
Syringetin-3-glucoside	24.9	255, 265(sh), 300(sh), 357	509, 347
Laricitrin-3-galactoside	19.4	256, 265(sh), 302(sh), 357	495, 333
Kaempferol-3-galactoside	21.1	266, 292(sh), 320(sh), 348	449, 287
Kaempferol-3-glucuronide	21.9	265, 290(sh), 320(sh), 348	463, 287
Quercetin-3-(6-acetyl)glucoside	22.9	257, 265(sh), 295(sh), 352	517, 303
Syringetin-3-(6-acetyl)glucoside	30.4	255, 265(sh), 298(sh), 358	517, 347