Table 3.
Change in the total phenolic and ascorbic acid contents of fruit juices after the different treatments
| Treatment conditions | Variation of the TPC (%) | Variation of the AAC (%) | ||||
|---|---|---|---|---|---|---|
| Temperature (°C) | Carvacrol (μl/L) | Time (min) | Pineapple juice | Orange juice | Watermelon juice | Orange juice |
| 90 | 0 | 0a | −1.34 ± 0.72 | +2.49 ± 1.32 | +4.53 ± 9.79 | −8.35 ± 0.00 |
| 90 | 0 | 20 | −4.54 ± 1.74 | −0.94 ± 1.23 | +7.34 ± 0.50 | −15.45 ± 0.59 |
| 90 | 30 | 20 | −0.83 ± 0.89 | +4.68 ± 0.87 | +13.18 ± 3.42 | −17.54 ± 1.18 |
| 90 | 0 | 40 | −4.14 ± 1.82 | +1.83 ± 0.51 | +8.86 ± 2.23 | −21.72 ± 0.00 |
| 90 | 60 | 40 | +0.31 ± 0.36 | +9.56 ± 0.61 | +24.40 ± 5.69 | −21.72 ± 0.00 |
| 80 | 15 | 10 | +4.45 ± 5.61 | +5.60 ± 2.90 | +13.67 ± 0.78 | −11.69 ± 0.00 |
| 80 | 45 | 10 | +2.08 ± 5.47 | +6.81 ± 0.80 | +22.94 ± 3.62 | −11.69 ± 0.00 |
| 80 | 15 | 30 | −1.05 ± 0.68 | +4.03 ± 1.98 | +14.17 ± 3.35 | −15.04 ± 0.00 |
| 80 | 45 | 30 | +9.91 ± 1.32 | +4.73 ± 0.55 | +27.97 ± 8.20 | −12.53 ± 1.18 |
| 70 | 0 | 0a | −1.61 ± 1.25 | +1.70 ± 0.67 | +4.50 ± 9.29 | −2.99 ± 0.00 |
| 70 | 30 | 0a | +2.26 ± 0.97 | +2.11 ± 1.51 | +14.15 ± 1.84 | −2.99 ± 0.00 |
| 70 | 0 | 20 | −2.96 ± 1.36 | +1.11 ± 2.89 | +11.73 ± 0.98 | −5.24 ± 1.06 |
| 70 | 30 | 20 | +2.06 ± 2.33 | +0.78 ± 4.11 | +25.65 ± 7.95 | −6.73 ± 1.06 |
| 70 | 30 | 20 | +1.82 ± 2.39 | +2.13 ± 3.86 | +13.79 ± 1.63 | −4.49 ± 0.00 |
| 70 | 30 | 20 | +1.41 ± 1.91 | +1.29 ± 0.88 | +26.90 ± 1.77 | −4.11 ± 0.53 |
| 70 | 60 | 20 | +3.69 ± 2.38 | +4.52 ± 3.42 | +25.54 ± 3.03 | −5.61 ± 0.53 |
| 70 | 0 | 40 | −2.70 ± 4.26 | −0.10 ± 2.19 | +7.97 ± 5.60 | −8.97 ± 0.00 |
| 70 | 30 | 40 | −0.25 ± 2.71 | +0.33 ± 1.47 | +15.82 ± 4.10 | −8.97 ± 0.00 |
| 60 | 15 | 10 | +9.33 ± 0.39 | +1.98 ± 0.36 | +31.21 ± 4.47 | −1.83 ± 0.86 |
| 60 | 45 | 10 | +9.07 ± 4.83 | +2.75 ± 0.82 | +31.87 ± 7.86 | −3.36 ± 0.43 |
| 60 | 15 | 30 | +6.04 ± 2.68 | −0.53 ± 0.68 | +24.94 ± 7.11 | −4.89 ± 0.00 |
| 60 | 45 | 30 | +6.56 ± 1.53 | +4.00 ± 0.46 | +22.76 ± 1.21 | −4.89 ± 0.00 |
| 50 | 0 | 0a | +0.03 ± 2.51 | +1.45 ± 2.79 | +6.11 ± 11.12 | 0.00 ± 0.00 |
| 50 | 0 | 20 | +3.82 ± 5.13 | −3.68 ± 1.16 | +17.65 ± 5.49 | −1.03 ± 0.49 |
| 50 | 30 | 20 | +4.43 ± 5.00 | −0.01 ± 1.82 | +28.42 ± 3.59 | −0.69 ± 0.00 |
| 50 | 0 | 40 | +0.86 ± 3.11 | −2.68 ± 0.80 | +5.69 ± 4.90 | −3.77 ± 0.49 |
| 50 | 60 | 40 | +9.67 ± 1.84 | −0.68 ± 1.75 | +42.45 ± 3.67 | −3.09 ± 0.49 |
| Nontreated juice | TPC (mg/L GAE) | AAC (mg/L) | ||||
| 995 ± 72 | 967 ± 139 | 276 ± 31 | 299 ± 40 | |||
GAE, gallic acid equivalent; TPC, total phenolic content; AAC, ascorbic acid content.
a
Samples were removed from the water bath as soon as they reached the desired temperature.