Table 2.
Values of pH for extraction of anthocyanins
| Solvent | FA | Jabuticaba skins | Red cabbage leaves | ||||
|---|---|---|---|---|---|---|---|
| CA | AA | NA | CA | AA | NA | ||
| Water | 7.24 | 2.15 | 2.98 | 3.40 | 2.20 | 2.65 | 3.61 |
| Methanol | 7.79 | 2.29 | 3.24 | 3.63 | 2.25 | 3.34 | 3.90 |
| Ethanol | 7.83 | 2.98 | 4.41 | 4.29 | 2.94 | 4.56 | 4.06 |
| Isopropanol | 6.90 | 2.88 | 4.81 | 4.71 | 3.43 | 4.38 | 4.30 |
| Water + methanol | 7.53 | 2.71 | 3.42 | 3.58 | 2.97 | 3.61 | 3.61 |
| Water + ethanol | 7.66 | 3.01 | 3.98 | 4.18 | 3.02 | 4.00 | 4.12 |
| Water + isopropanol | 7.44 | 3.13 | 4.44 | 4.26 | 3.32 | 4.50 | 4.13 |
FA free of acid; CA citric acid (0.1 mol kg−1); AA adipic acid (0.1 mol kg−1); NA nicotinic acid (0.01 mol kg−1); standard relative deviation 0.03