Trans-Piceatannol

Fig. 9C.6 Chemical structures of stilbenes trani-resveratrol (1), ais-resveratrol (2), froni-piceid (3), cii-piceid (4), ironi-piceatannol (5), frani-pterostilbene (6), trani-5-viniferin (7), trans- s-vinifeiin (8), a-viniferin (9), hopeaphenol (10)...

C14H11N02 trans-1-nitro-2-(2-phenylvinyl)benzene 4264-29-3 25.00 1.2172 2 26986 C14H1204 piceatannol 10083-24-6 25.00 1.2428 2... 

Figure 2.25 Chromatogram relative to the hydroxystilbenes analysis in a grape skins extract recorded at wavelength 325 nm. 1. piceatannol glucoside 2. trans-resveratrol glucoside 3. piceatannol 4. traws-resveratrol (F. Grippi, personal communication)...

Figure 6.8. 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 la), and of [M-H]- ions of frara-resveratrol (R = H) and piceatannol at m/z 243 (R = OH, compound 2) considering that the deprotonation reaction occurred on the resorcinol moiety (Scheme lb). (Reprinted from Rapid Communications in Mass Spectrometry 22, Stella et al., Collisionally induced fragmentation of [M-H]" species of resveratrol and piceatannol investigated by deuterium labelling and accurate mass measurements, p. 3869, Copyright 2008, with permission from John Wiley Sons, Ltd.)...

Stilbenes are minor compounds in grapes. However, their importance is due to the fact that grape is the main source of stilbenes in diet. Stilbenes are essentially located in grape skin [36, 37] but have also been reported in grape seeds [38] and grape stem [39] (Fig. 83.2g). The main stilbenes in grape are resveratrol (trans and cis) and piceid (trans and cis), but some others have also been described piceatannol, astringin, pterostilbene, s-viniferin, and 8-viniferin [40]. 

---