Table 7.
Variability in the total polar phenol (TPP), total hydroxytyrosol (Htyr) and tyrosol (Tyr) content, and ratio Htyr to Tyr of VOOs extracted from olives cv. Chondrolia Chalkidikis and Chalkidiki at different stages of maturity for four consecutive harvest years (2017/18, 2018/19, 2019/20, 2020/21).
| Harvest Date | 2017/18 | 2018/19 | 2019/20 | 2020/21 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TPPC * mg/kg |
Total Htyr + Tyr mg/20 g |
Htyr/Tyr | TPPC * mg/kg |
Total Htyr + Tyr mg/20 g |
Htyr/ Tyr |
TPPC * mg/kg |
Total Htyr + Tyr mg/20 g |
Htyr/ Tyr |
TPPC * mg/kg |
Total Htyr + Tyr mg/20 g |
Htyr/ Tyr |
|
| VOOs produced at laboratory scale | ||||||||||||
| 15/9 | 676 ± 49 | 24 | 0.44 | 372 ± 7 | 13 | 0.60 | 508 ± 11 | 12 | 0.70 | 463 ± 40 | 14 | 0.48 |
| 3/10 | - | - | 491 ± 10 | 20 | 0.66 | 819 ± 15 | 19 | 0.65 | 415 ± 9 | 12 | 0.54 | |
| 8/10 | 673 ± 28 | 26 | 0.46 | 495 ± 26 | 17 | 0.82 | 916 ± 34 | 21 | 0.50 | - | - | |
| 15/10 | 311 ± 11 | 13 | 0.31 | 515 ± 8 | 9 | 0.54 | 881 ± 10 | 19 | 0.47 | 371 ± 2 | 12 | 0.58 |
| 22/10 | 437 ± 11 | 15 | 0.51 | 440 ± 20 | 10 | 0.48 | 697 ± 31 | 20 | 0.43 | - | - | |
| 29/10 | 273 ± 6 | 15 | 0.52 | - | - | 798 ± 58 | 19 | 0.97 | 430 ± 5 | 11 | 0.91 | |
| 16/11 | 198 ± 9 | 8 | 0.97 | - | - | 794 ± 7 | 12 | 0.48 | - | - | ||
| VOOs produced at industrial scale | ||||||||||||
| 22/10- | - | - | 218 ± 4 | 5 | 0.45 | - | - | - | - | |||
| 29/10 | 237 ± 12 | 13 | 0.38 | - | - | - | - | 271 ± 3 | 8 | |||
| 16/11 | - | - | - | - | 370 ± 5 | 8 | 0.70 | - | - | |||
* mean values ± standard deviation (n = 3).