TEAC value is expressed as mmol/l and converted to μg/g. A higher TEAC value of a sample is related to a stronger antioxidant capacity (Lee & Yen, 2006).
Data on total phenol content (TPC) and antioxidant capacity (AC) were reported as mean ± standard deviation (SD) from triplicate determinations for each grape seed oil samples. For each grape seed oil three samples were taken. Analyses of significant group differences in TPC and AC were conducted (SPSS for Windows, Version Rel. 10.0.7., 2000, SPSS Inc., Chicago, IL) by using the non-parametric Mann–Whitney-U test to identify differences among means. Statistical significance was declared at p ⩽ 0.05.