Table 1.
The rates of DPPH˙ radical scavenging (RS) at 0.1 s, the formazan formation (RFF) at 10 s, and the β-carotene bleaching (RB) at 10 s, and the determination coefficients for the kinetics of the DPPH˙ radical scavenging (r2 (DPPH˙)), the O2˙− scavenging (r2 (O2˙−)), and the β-carotene bleaching (r2 (β-carotene)). The data for the DPPH˙ scavenging activity (IDPPH) estimated at 30 min, the superoxide radical scavenging activity coefficient (CSASA) estimated at 5 min, and the antioxidant activity coefficient in emulsion (CAA) estimated at 60 min. Chromatographic partition values (CPV) are also given.
| Selected Compound | RS × 10−2 (s−1) | RFF × 10−3 (s−1) | RB × 10−4 (s−1) | r2 (DPPH˙) | r2 (O2˙−) | r2 (β-Carotene) | IDPPH (%) a | CSASA (%) a | CAA (%) a | CPV |
|---|---|---|---|---|---|---|---|---|---|---|
| Sinapic acid (SA) | 15.40 | 1.57 | 10.54 | 0.946 | 0.967 | 0.978 | 86 ± 0.4 | 66 ± 4 | 29 ± 2 | 0.46 |
| Sinapine (SI) | 0.27 | 14.21 | 7.62 | 0.967 | 0.996 | 0.967 | 23 ± 0.5 | 0 | 2 ± 0.5 | 0.20 |
| Vinyl syringol (VS) | 34.83 | 2.31 | 7.33 | 0.967 | 0.965 | 0.984 | 74 ± 0.6 | 26 ± 1 | 60 ± 1 | 0.73 |
| Syringic acid (SY) | 1.21 | 0.92 | 4.78 | 0.962 | 0.953 | 0.975 | 80 ± 1 | 75 ± 0.1 | 6 ± 1 | 0.34 |
| Syringaldehyde (SYA) | 0.05 | 6.37 | 3.37 | 0.447 | 0.981 | 0.968 | 6 ± 0.6 | 23 ± 3 | 1 ± 0.2 | 0.40 |
| Ethyl sinapate (SE) | 46.27 | 9.88 | 6.46 | 0.901 | 0.988 | 0.987 | 69 ± 1 | 5 ± 1 | 62 ± 2 | 0.90 |
| Propyl sinapate (SP) | 81.44 | ND | 2.79 | 0.969 | ND | 0.984 | 67 ± 1 | ND | 73 ± 1 | 1.13 |
| Butyl sinapate (SB) | 35.93 | ND | 1.99 | 0.875 | ND | 0.980 | 67 ± 0.8 | ND | 75 ± 1 | 1.38 |
a Means of two replicates ± standard deviation; ND, not determined.