Table 3.
HPLC-DAD analysis of hydro-alcoholic extracts 1.
| Chemical Class | Compounds | PRE | TRE | TRE Fruits | TRE Seeds | CRE1 | CRE2 | CRE3 |
|---|---|---|---|---|---|---|---|---|
| Organic acids | Caftaric acid | 59.40 ± 4.39 | 60.37 ± 1.05 | 51.48 ± 4.26 | N.Q. | 24.92 ± 1.50 | 74.93 ± 2.27 | 38.62 ± 0.73 |
| Flavonols | Rutin | 2.73 ± 0.34 | N.Q. | N.Q. | N.Q. | 4.32 ± 0.16 | 5.03 ± 0.23 | 5.54 ± 0.08 |
| Hyperoside | 0.59 ± 0.02 | N.Q. | N.Q. | 2.40 ± 0.13 | N.Q. | 0.50 ± 0.01 | 0.95 ± 0.02 | |
| Quercetin-3-O-glucoside | 10.99 ± 0.51 | 0.52 ± 0.07 | 2.18 ± 0.04 | 4.90 ± 0.26 | 5.00 ± 0.19 | 8.05 ± 0.21 | 23.34 ± 0.73 | |
| Quercetin-3-O-glucuronide | 21.68 ± 0.91 | N.D. | N.D. | N.D. | N.Q. | N.Q. | N.Q. | |
| Kaempferol-3-O-glucoside | 16.81 ± 0.49 | N.Q. | 0.70 ± 0.10 | 1.43 ± 0.01 | 1.03 ± 0.03 | 0.38 ± 0.03 | 4.48 ± 0.04 | |
| Flavan-3-ols monomers | Catechin | N.D. | 615.33 ± 42.84 | N.D. | 10231.06 ± 89.38 | N.D. | N.D. | N.D. |
| Epicatechin | N.D. | 148.14 ± 13.43 | N.D. | 3201.16 ± 156.90 | N.D. | N.D. | N.D. | |
| Epicatechin-3-gallate | N.D. | 10.86 ± 0.34 | N.D. | 300.50 ± 7.11 | N.D. | N.D. | N.D. | |
| Epigallocatechin-3-gallate | N.D. | 4.94 ± 0.22 | N.D. | 19.45 ± 0.62 | N.D. | N.D. | N.D. | |
| Flavan-3-ols dimers and trimers | Procyanidin B1 | N.D. | 345.46 ± 15.43 | N.D. | 1690.27 ± 76.26 | N.D. | N.D. | N.D. |
| Procyanidin B2 | N.D. | 41.82 ± 2.16 | N.D. | 579.60 ± 51.79 | N.D. | N.D. | N.D. | |
| Procyanidin B3 | N.D. | 138.93 ± 9.03 | N.D. | 1684.81 ± 34.85 | N.D. | N.D. | N.D. | |
| Procyanidin C1 | N.D. | 14.00 ± 1.24 | N.D. | 703.27 ± 4.85 | N.D. | N.D. | N.D. |
1 N.D.: not detectable (under the LOD values, according to Table 2 and [18]); N.Q. not quantifiable (under the LOQ values, according to Table 2 and [18]). Results are the mean ± s.d. of at least three analysis, expressed as μg/g raisin. TRE: Turkish raisin extract; PRE: Portuguese raisin extract; CRE: commercial raisin extract.