TABLE 5.
Stability of bioactive parameters total polyphenol content (TPC), antioxidant activity (AA), and IC50, and pH of white grape marc extract in 50% ethyl lactate extractant to modification in storage conditions.
| Factor | Values | TPC (mgGAE⋅L–1) | AA (mmolTE⋅L–1) | IC50 (mgGAE⋅L–1) | pH |
| Day | 0 | 3,677 | 19.0 | 7.6 | 4.65 |
| 2 | 3,518 | 16.1 | 13.2H | 4.52 | |
| 4 | 3,815 | 17.6 | 10.0 | 4.53 | |
| 8 | 5,028H | 19.9 | 14.9H | 4.49 | |
| 20 | 3,681 | 13.8L | 13.6H | 4.37 | |
| 34 | 3,286 | 14.1L | 15.8H | 4.32L | |
| 62 | 3,479 | 12.9L | 15.4H | 4.14L | |
| p-value | <0.001 | <0.001 | <0.001 | <0.001 | |
| Light | No | 3,802 | 16.2 | 13.0 | 4.43 |
| Yes | 3,764 | 16.2 | 12.8 | 4.43 | |
| p-value | >0.05 | >0.05 | >0.05 | >0.05 | |
| Nitrogen | No | 3,743 | 15.9 | 13.1 | 4.43 |
| Yes | 3,823 | 16.5H | 12.8 | 4.43 | |
| p-value | >0.05 | 0.030 | >0.05 | >0.05 | |
| Temperature (°C) | –20 | 3,780 | 16.3 | 13.1 | 4.55H |
| 4 | 3,802 | 16.4 | 12.7 | 4.468H | |
| 20 | 3,768 | 16.0 | 13.0 | 4.274 | |
| p-value | >0.05 | >0.05 | >0.05 | <0.001 |
HUpper significant value. LLower significant value.