Table 3.
Results obtained at ascorbic acid determination in natural juices, soft drinks and wines by differential pulse voltammetry and cyclic voltammetry performed at a Pt strip working electrode.
| Analysed product (producer) | Ascorbic acid concentration-cyclic voltammetry (mg/100 mL juice) | Ascorbic acid concentration -cyclic voltammetry- after addition (35.2 mg AA added to 100 mL juice) | Degree of recovery (%) | Ascorbic acid concentration- differential pulse voltammetry (mg/100 mL juice) | Ascorbic acid concentration -differential pulse voltammetry- after addition (35.2 mg AA added to 100 mL juice) | Degree of recovery (%) |
|---|---|---|---|---|---|---|
| Orange juice (fruit pressing) | 39.25 | 72.25 | 97.86 | 41.24 | 76.06 | 103.24 |
| Grapefruit juice (fruit pressing) | 35.23 | 70.43 | 103.99 | 39.82 | 74.54 | 102.87 |
| Lemon juice (fruit pressing) | 50.82 | 85.96 | 104.72 | 52.15 | 85.19 | 98.72 |
| Fanta Madness (Coca Cola HBC Romania) | 7.26 | 42.80 | 103.42 | 6.83 | 42.27 | 103.10 |
| Prigat active grapefruit (Quadrant Amroq Beverages) | 12.46 | 47.18 | 101.33 | 11.79 | 44.51 | 95.48 |
| Prigat active sour cherry (Quadrant Amroq Beverages) | 11.91 | 48.15 | 105.68 | 12.38 | 46.99 | 101.01 |
| Prigat kiwi (Quadrant Amroq Beverages) | 14.14 | 47.16 | 96.49 | 13.93 | 48.76 | 101.73 |
| Frutia tomato (European Drinks) | 18.92 | 54.52 | 104.23 | 19.41 | 51.72 | 94.73 |
| Wine (Recas vineyard) | 15.86 | 48.42 | 95.25 | 15.66 | 51.49 | 104.72 |