Research Article
Adsorption of Polyphenols from Almond Blanching Water by Macroporous Resin
Table 2
Phenolic compounds identified by UPLC-DAD/ESI-MSn in almond skin extracts.
| Peak | Suggested structure | (min) | [M-H]- (m/z) | MS2 (m/z) | UVmax (nm) |
| 1 | (Epi)catechin digallate | 1.5 | 593 | 441; 315; 289 | 277 | 2 | Protocatechuic dihexose | 1.9 | 477 | 323; 225; 153 | 277 | 3 | Vanillic acid dihexose | 2 | 491 | 323; 167 | 256; 288 | 4 | Vanillic acid hexose | 2.2 | 329 | 167 | 254; 291 | 5 | Vanillic acid dihexose | 3 | 491 | 323; 167 | 279 | 6 | 3-O-caffeoylquinic | 2.9 | 353 | 191 | 211; 344 | 7 | (Epi)catechin dihexose | 3.2 | 613 | 289 | 280 | 8 | B-type dimer | 4 | 577 | 289 | 280 | 9 | 4-p-Coumaroylquinic acid | 4.2 | 337 | 163; 191 | 308 | 10 | Catechin | 4.6 | 289 | 245 | 280 | 11 | Chlorogenic acid | 4.75 | 353 | 191; 179 | 325 | 12 | B-type trimer | 5.3 | 865 | 577 | 280 | 13 | B-type tetramer | 5.6 | 1153 | 289; 865 | 280 | 14 | B-type dimer | 6.25 | 577 | 289 | 280 | 15 | Epicatechin | 7 | 289 | 245; 205 | 279 | 16 | Kaempferol-3-O-rutinoside | 10 | 593 | 285 | 347 | 17 | Isorhamnetin-3-O-rutinoside | 10.2 | 623 | 315 | 346 | 18 | Isorhamnetin-3-O-glucoside | 10.3 | 477 | 315 | 346 | 19 | Kaempferol-3-O-glucoside | 10 | 447 | 285 | 347 | 20 | Rutin | 10.9 | 609 | 301 | 350 |
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