Table 4.
Concentrations of phenolic compounds (µg of phenolic compound/g of EVOO, ppm) in three different EVOOs (A, B, and C) storage at 25 °C and exposed to light. Data are expressed as means ± SD of experiment performed in triplicate. N.D. = not detectable.
| Month | EVOO | Hydroxytyrosol | Tyrosol | Oleacein | Oleocanthal | Oleocanthalic Acid |
|---|---|---|---|---|---|---|
| December 2019 | A | 4.72 ± 0.11 | 5.47 ± 0.25 | 116.09 ± 18.39 | 148.93 ± 3.04 | 10.61 ± 2.96 |
| B | 5.67 ± 0.01 | 7.28 ± 0.01 | 110.69 ± 9.80 | 226.36 ± 13.30 | - | |
| C | 34.11 ± 0.57 | 55.62 ± 3.10 | 94.49 ± 3.75 | 216.12 ± 36.44 | 39.72 ± 4.59 | |
| January 2020 | A | 27.30 ± 0.74 | 47.80 ± 1.21 | 42.72 ± 3.10 | 72.45 ± 10.51 | 13.70 ± 0.17 |
| B | 14.53 ± 0.34 | 19.73 ± 2.43 | 83.22 ± 19.83 | 173.17 ± 11.17 | 37.54 ± 1.51 | |
| C | 36.85 ± 1.70 | 59.15 ± 2.53 | 72.24 ± 7.05 | 176.47 ± 13.33 | 51.07 ± 4.20 | |
| February 2020 | A | 27.09 ± 0.07 | 51.66 ± 1.33 | 40.96 ± 3.99 | 43.38 ± 5.26 | 17.48 ± 1.92 |
| B | 16.34 ± 0.18 | 22.14 ± 0.63 | 65.30 ± 16.09 | 134.09 ± 4.94 | 38.75 ± 1.66 | |
| C | 37.06 ± 0.04 | 61.43 ± 0.02 | 66.23 ± 12.31 | 149.64 ± 20.87 | 58.72 ± 6.79 | |
| June 2020 | A | 29.89 ± 0.05 | 51.74 ± 0.28 | 16.20 ± 1.05 | 31.58 ± 1.15 | 20.37 ± 0.95 |
| B | 18.93 ± 2.77 | 27.70 ± 0.61 | 55.30 ± 19.06 | 88.56 ± 13.35 | 41.28 ± 7.31 | |
| C | 38.44 ± 3.91 | 65.76 ± 0.03 | 52.96 ± 7.33 | 98.93 ± 15.17 | 63.13 ± 3.07 | |
| July 2020 | A | 28.64 ± 0.54 | 52.63 ± 4.18 | N.D. | N.D. | 20.64 ± 0.55 |
| B | 22.20 ± 4.19 | 27.78 ± 1.00 | 43.45 ± 11.00 | 74.50 ± 11.13 | 45.26 ± 2.39 | |
| C | 40.29 ± 0.35 | 67.69 ± 2.35 | 36.93 ± 2.29 | 91.33 ± 9.36 | 67.71 ± 0.46 | |
| September 2020 | A | 27.36 ± 1.34 | 53.14 ± 0.13 | N.D. | N.D. | 22.04 ± 0.67 |
| B | 21.28 ± 0.17 | 28.43 ± 0.57 | 43.37 ± 18.58 | 73.59 ± 8.80 | 46.70 ± 1.22 | |
| C | 41.78 ± 0.73 | 67.89 ± 1.89 | 33.72 ± 19.08 | 89.72 ± 7.23 | 75.11 ± 1.23 | |
| October 2020 | A | 27.36 ± 0.42 | 53.66 ± 1.00 | N.D. | N.D. | 22.39 ± 3.43 |
| B | 20.86 ± 0.47 | 29.29 ± 0.71 | 35.62 ± 10.56 | 71.31 ± 11.69 | 54.95 ± 0.83 | |
| C | 34.06 ± 0.88 | 69.77 ± 0.96 | 33.44 ± 0.40 | 77.73 ± 11.28 | 77.16 ± 7.27 | |
| November 2020 | A | 25.30 ± 0.01 | 54.18 ± 0.91 | N.D. | N.D. | 23.11 ± 1.25 |
| B | 20.36 ± 0.90 | 33.09 ± 0.34 | N.D. | N.D. | 56.64 ± 0.92 | |
| C | 31.95 ± 6.21 | 72.39 ± 0.90 | N.D. | 66.34 ± 10.36 | 95.56 ± 5.21 | |
| December 2020 | A | 19.22 ± 0.92 | 54.51 ± 0.34 | N.D. | N.D. | 23.96 ± 2.98 |
| B | 20.18 ± 0.63 | 33.54 ± 2.72 | N.D. | N.D. | 60.39 ± 0.68 | |
| C | 31.88 ± 7.04 | 73.47 ± 2.78 | N.D. | N.D. | 89.11 ± 0.15 | |
| March 2021 | A | 17.91 ± 2.80 | 54.76 ± 2.25 | N.D. | N.D. | 24.00 ± 6.85 |
| B | 18.50 ± 0.29 | 36.63 ± 0.19 | N.D. | N.D. | 67.23 ± 3.84 | |
| C | 30.49 ± 1.24 | 74.38 ± 0.06 | N.D. | N.D. | 83.27 ± 7.56 |