Extraction conditions EC50 (µg/ml) Reducing power  (OD700) Total phenol (g/g grape seed extracts) Yield (%) 10g grape seed,3 hours, room temperature 261.33b ± 4.86 2.1306b ± 0.0303 0.2360b ± 0.0010 11.78b ± 0.16 7.5 g grape seed ,6 hours, 50°C 214.60a ± 1.64 2.3847a ± 0.0229 0.3286a ± 0.0004 14.86a ± 0.03 Different letters indicate significant differences (P < 0.05) for values of one property down the column Values are means ± SE (with 3 replications)

Table 4: Comparison of properties and extraction yields of GSE using 50% ethanol at the selected extraction conditions.