Table 4.
Quantification of phenolic compounds in stone fruits waste samples by HPLC-photodiode array detection (PDA).
| No. | Compound Name | Peach (mg/g fw) |
Nectarine (mg/g fw) |
Plum (mg/g fw) |
Apricot (mg/g fw) |
Phenolic Class |
|---|---|---|---|---|---|---|
| 1 | Gallic acid | 2.98 ± 0.18 a | - | 2.75 ± 0.22 a | 1.25 ± 0.06 b | Phenolic acids |
| 2 | Protocatechuic acid | - | 1.27 ± 0.09 c | 3.12 ± 0.15 a | 2.47 ± 0.22 b | Phenolic acids |
| 3 | p-Hydroxybenzoic acid | 18.64 ± 1.30 a | 9.67 ± 0.48 b | 14.25 ± 0.99 a | 3.69 ± 0.26 c | Phenolic acids |
| 4 | Chlorogenic acid | 15.96 ± 0.80 a | 3.59 ± 0.32 c | 12.35 ± 0.74 a | 4.58 ± 0.23 b | Phenolic acids |
| 5 | Caffeic acid | 0.98 ± 0.06 c | 4.58 ± 0.27 a | 3.29 ± 0.26 b | - | Phenolic acids |
| 6 | Catechin | 7.45 ± 0.59 c | 9.64 ± 0.58 b | 14.58 ± 1.31 a | 7.58 ± 0.61 c | Flavonoids |
| 7 | Epicatechin | 1.25 ± 0.08 b | 0.78 ± 0.04 c | 2.39 ± 0.19 a | 1.39 ± 0.11 b | Flavonoids |
| 8 | Epicatechin gallate | 2.45 ± 0.12 a | - | - | 0.98 ± 0.06 b | Flavonoids |
| 9 | Quercetin | 19.68 ± 1.38 a | 12.47 ± 0.87 b | 14.78 ± 1.18 b | 6.37 ± 0.45 c | Flavonoids |
| 10 | Kaempferol | 5.98 ± 0.36 b | 2.17 ± 0.20 c | 7.98 ± 0.40 a | 1.87 ± 0.16 c | Flavonoids |
All data are the mean ± SD of three replicates. Means followed by different letters (a, b, c) within the same column are significantly different (p < 0.05) from each other. Data of peach, nectarine, plum and apricot waste are reported on a fresh weight basis.