Table 7.
Antioxidant activity of four meadowsweet floral tea decoctions and reference compounds a.
| Method b | F. camschatica | F. denudata | F. stepposa | F. ulmaria |
|---|---|---|---|---|
| DPPH• | 23.72 ± 0.59 ii | 8.13 ± 0.21 ii | 7.33 ± 0.19 ii | 10.43 ± 0.26 ii |
| ABTS•+ | 9.76 ± 0.23 iv | 4.97 ± 0.11 iii | 4.08 ± 0.08 iii | 5.74 ± 0.12 iii |
| Br•− | 111.89 ± 2.12 v | 241.95 ± 4.35 vi | 259.64 ± 4.67 vi | 228.11 ± 4.33 v, vi |
| CBA | 21.16 ± 0.76 | 4.11 ± 0.15 ix | 3.53 ± 0.12 viii, ix | 4.55 ± 0.16 ix |
| Spiraeoside | Rugosin D | Methyl salicylate | Trolox | |
| DPPH• | 82.40 ± 2.14 | 5.36 ± 0.11 i | >100 | 7.40 ± 0.14 i |
| ABTS•+ | 7.02 ± 0.14 iii, iv | 0.70 ± 0.01 | 59.18 ± 1.24 | 4.27 ± 0.08 iii |
| Br•− | 1046.82 ± 19.88 vii | 1293.63 ± 24.58 vii | 331.53 ± 5.96 vi | 663.25 ± 12.98 |
| CBA | >100 | 2.62 ± 0.09 | >100 | 2.70 ± 0.10 viii |
a Average of three analyses (±SD); b DPPH•—DPPH• radical scavenging activity (IC50, μg/mL); ABTS•+—ABTS•+ radical scavenging activity (IC50, μg/mL); Br•−—bromine anion radical scavenging activity (mg gallic acid equivalents per g extract); CBA—carotene bleaching assay (IC50, μg/mL). All values correspond to mean values ± standard deviation of three replicates. Values with different letters (i–ix) indicate statistically significant differences among groups at p < 0.05 by one-way ANOVA.