Table 4.
Total phenolic (mg gallic acid equivalents/g f.w.), total flavonoid (mg rutin equivalents/g f.w.), ascorbic acid (mg/100 g f.w.) content, DPPH (mg ascorbic acid equivalents antioxidant capacity/100 g f.w.) and FRAP (μM/g f.w.) of asparagus spears (cv. ‘Grolim’) as affected by spear tip color (white or violet) and spear portion: apical (0–7), middle (7–14) and basal (14–21 cm from the tip).
| Spear portion (cm) | Total phenolics | Total flavonoids | Ascorbic acid | DPPH | FRAP | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| White spears | ||||||||||
| 0–7 | 0.393 | b | 0.236 | b | 26.50 | b | 13.42 | b | 34.79 | b |
| 7–14 | 0.254 | c | 0.147 | c | 15.95 | cd | 6.23 | c | 13.85 | c |
| 14–21 | 0.266 | c | 0.139 | c | 15.03 | de | 4.99 | c | 14.75 | c |
| Violet spears | ||||||||||
| 0–7 | 0.502 | a | 0.430 | a | 35.17 | a | 22.38 | a | 68.33 | a |
| 7–14 | 0.206 | d | 0.161 | c | 16.74 | c | 5.73 | c | 12.37 | c |
| 14–21 | 0.244 | c | 0.157 | c | 14.60 | e | 5.52 | c | 13.89 | c |
Each value is the mean of six replicates. Different letters at each column denote significant differences between means (Duncan’s multiple range test, P < 0.05).