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Effective concentrations for the antioxidant activity of three extracts and two controls
| Group | DPPH assay (IC50, μg/ml) | ABTS assay (IC50, μg/ml) | FRAP assay (μg/ml) |
| ZEF | 112.7 | 43.3 | 1292.3 |
| ZBF | 310.5 | 60.0 | 683.7 |
| ZWF | >1000.0 | 468.9 | 116.7 |
| BHT | 971.9 | 115.1 | 187.3 |
| EGCG | 93.3 | 42.4 | 1262.8 |
ZEF, ZBF, and ZWF are extracted from Zhangping Narcissus tea cake by ethyl acetate, n-butanol, and water, respectively. FRAP value was calculated at 500 μg/ml
