Table 2.
Polyphenolic compounds identified in natural (NS) and blanched (BS) almond skins.
| Peak No. | Compound | * RT (min) | λmax (nm) |
|---|---|---|---|
| 1 | Protocatechuic acid | 13.081 | 259; 294 |
| 2 | p-Hydroxybenzoic acid | 20.442 | 255 |
| 3 | Catechin | 23.616 | 278 |
| 4 | Chlorogenic acid | 26.510 | 296; 326 |
| 5 | Vanillic acid | 26.892 | 261; 292 |
| 6 | Epicatechin | 32.561 | 278 |
| 7 | trans-p-Coumaric acid | 38.015 | 310 |
| 8 | Eryodictiol-7-O-glucoside | 45.933 | 284 |
| 9 | Quercetin-3-O-rutinoside | 47.434 | 256; 354 |
| 10 | Quercetin-3-O-galactoside | 47.757 | 256; 354 |
| 11 | Quercetin-3-O-glucoside | 48.892 | 256; 354 |
| 12 | Kaempferol-3-O-rutinoside | 53.395 | 265; 347 |
| 13 | Kaempferol-3-O-glucoside | 54.279 | 265; 347 |
| 14 | Naringenin-7-O-glucoside | 54.555 | 284; 338 |
| 15 | Isorhamnetin-3-O-rutinoside | 54.937 | 256; 354 |
| 16 | Isorhamnetin-3-O-glucoside | 56.650 | 254; 354 |
| 17 | Eriodictyol | 66.052 | 288 |
| 18 | Quercetin | 70.367 | 256; 372 |
| 19 | Naringenin | 73.018 | 288 |
| 20 | Kaempferol | 88.516 | 264; 366 |
| 21 | Isorhamnetin | 93.060 | 254; 370 |
Bold values correspond to the peak number present in the chromatograms. * RT = Retention time.