Table 3.
Polyphenolic compounds in natural (NS) and blanched (BS) almond skins. Values are expressed as µg/100 g and represent the average (±SD) of three independent experiments (n = 3).
| Compound | NS | BS |
|---|---|---|
| Hydroxybenzoic acids | ||
| Protocatechuic acid | 3862.97 ± 124.52 | 878.24 ± 22.65 |
| p-Hydroxybenzoic acid | 7094.27 ± 224.10 | 696.21 ± 32.41 |
| Vanillic acid | 5652.08 ± 236.54 | 709.027 ± 11.35 |
| Hydroxycinnamic acids | ||
| Chlorogenic acid | 1144.54 ± 84.25 | 375.41 ± 8.54 |
| trans-p-Coumaric acid | 791.62 ± 22.45 | 142.19 ± 5.24 |
| Flavanones | ||
| Eriodictyol | 2777.23 ± 78.65 | 364.8 ± 12.54 |
| Eryodictiol-7-O-glucoside | 57.9 ± 1.26 | 8.33 ± 0.221 |
| Naringenin | 5802.51 ± 185.44 | 474.54 ± 20.85 |
| Naringenin-7-O-glucoside | 34,020.11 ± 654.22 | 2148.22 ± 62.35 |
| Flavonols | ||
| Kaempferol-3-O-rutinoside | 8062.45 ± 261.33 | 1037.64 ± 52.14 |
| Kaempferol-3-O-glucoside | 29,530.44 ± 854.22 | 522.84 ± 21.47 |
| Isorhamnetin-3-O-glucoside | 16,597.37 ± 546.31 | 908.86 ± 18.95 |
| Quercetin | 3474.03 ± 105.62 | 2035.8 ± 68.54 |
| Kaempferol | 5573.6 ± 88.65 | 998.84 ± 22.64 |
| Isorhamnetin | 3513.47 ± 112.35 | 230.4 ± 9.87 |
| Quercetin-3-O-rutinoside | 1067 ± 55.62 | 299.55 ± 8.03 |
| Quercetin-3-O-galactoside | 1400.8 ± 37.45 | 123.56 ± 4.42 |
| Quercetin-3-O-glucoside | 1219.53 ± 24.89 | 108.67 ± 2.89 |
| Isorhamnetin-3-O-rutinoside | 17,620.45 ± 495.65 | 1526.53 ± 23.98 |
| Flavanols | ||
| Epicatechin | 26,948.72 ± 554.25 | 1900.8 ± 62.74 |
| Catechin | 47,998.32 ± 956.54 | 4210.91 ± 88.54 |
| Total amount | 224,209.41 | 19,701.36 |