Table 3 Effect of long-term storage on the free radical scavenging activity of 21 South African medicinal plants
From: Antioxidant and acetylcholinesterase-inhibitory properties of long-term stored medicinal plants
Plant species | Plant part | Radical scavenging activity (%) at 100 μg/ml | EC50(μg/ml) | Antioxidant activity index | |||
|---|---|---|---|---|---|---|---|
Stored | Fresh | Stored | Fresh | Stored | Fresh | ||
Acokanthera oppositifolia δ | Roots | 93.3 ± 0.03 ** | 92.6 ± 0.10 | 26.8 ± 2.43 * | 18.0 ± 0.34 | 0.7 ± 0.06 ** | 1.1 ± 0.02 |
Artemisia afra # | Aerial parts | 93.8 ± 0.11 * | 92.7 ± 0.34 | 9.3 ± 0.07 *** | 12.4 ± 0.15 | 2.1 ± 0.02 *** | 1.6 ± 0.02 |
Artemisia afra δ | Aerial parts | 94.0 ± 0.07 * | 92.7 ± 0.34 | 6.8 ± 0.50 *** | 12.4 ± 0.15 | 2.9 ± 0.21 ** | 1.6 ± 0.02 |
Buddleja salviifolia # | Leaves | 96.2 ± 0.06 *** | 93.0 ± 0.40 | 15.5 ± 0.47 ** | 10.0 ± 0.61 | 1.3 ± 0.04 ** | 2.0 ± 0.12 |
Buddleja salviifolia # | Twigs | 94.2 ± 0.13 ns | 94.3 ± 0.15 | 17.2 ± 0.32 ns | 17.5 ± 0.40 | 1.1 ± 0.02 ns | 1.1 ± 0.03 |
Clausena anisata # | Leaves & Twigs | 70.8 ± 0.28 ns | 72.6 ± 6.21 | 33.2 ± 3.89 ns | 26.8 ± 2.06 | 0.6 ± 0.07 ns | 0.7 ± 0.06 |
Cussonia spicata # | Leaves | 93.7 ± 0.07 *** | 61.6 ± 1.67 | 14.3 ± 0.22 ** | 43.6 ± 5.73 | 1.4 ± 0.02 *** | 0.5 ± 0.07 |
Dombeya rotundifolia # | Leaves | 96.5 ± 0.56 ** | 93.6 ± 0.27 | 5.9 ± 0.12 ns | 6.1 ± 0.32 | 3.3 ± 0.07 ns | 3.2 ± 0.16 |
Ekebergia capensis δ | Leaves & Twigs | 94.2 ± 0.42 * | 92.8 ± 0.30 | 4.7 ± 0.37 ** | 25.5 ± 4.99 | 4.3 ± 0.32 *** | 0.8 ± 0.14 |
Leonotis intermedia δ | Leaves | 93.3 ± 0.09 * | 88.5 ± 1.73 | 10.6 ± 0.37 *** | 51.7 ± 0.32 | 1.9 ± 0.06 *** | 0.4 ± 0.00 |
Leonotis leonurus δ | Leaves | 93.7 ± 0.18 ** | 91.6 ± 0.43 | 16.8 ± 0.06 *** | 30.3 ± 0.92 | 1.2 ± 0.00 *** | 0.7 ± 0.02 |
Merwilla plumbea δ | Bulbs | 8.2 ± 0.61 ** | 2.6 ± 0.97 | ND | ND | ND | ND |
Ocotea bullata δ | Bark | 95.0 ± 0.25 ** | 93.8 ± 0.02 | 3.2 ± 0.14 ** | 4.3 ± 0.10 | 6.3 ± 0.28 ** | 4.6 ± 0.11 |
Olea europaea # | Leaves | 94.9 ± 0.20 ** | 93.2 ± 0.09 | 14.0 ± 0.48 *** | 20.0 ± 0.16 | 1.4 ± 0.05 *** | 1.0 ± 0.01 |
Pittosporum viridiflorum # | Leaves & Twigs | 93.6 ± 0.10 ns | 93.8 ± 0.29 | 17.9 ± 0.25 ns | 17.5 ± 0.27 | 1.1 ± 0.02 ns | 1.1 ± 0.02 |
Plumbago auriculata δ | Leaves | 50.6 ± 3.97 ns | 54.6 ± 1.15 | ND | ND | ND | ND |
Protorhus longifolia δ | Leaves | 95.8 ± 0.24 ** | 97.3 ± 0.21 | 2.2 ± 0.16 ns | 2.3 ± 0.14 | 9.1 ± 0.71 ns | 8.5 ± 0.49 |
Solanum mauritianum δ | Leaves | 34.4 ± 0.73 *** | 19.8 ± 1.53 | ND | ND | ND | ND |
Spirostachys africana # | Leaves & Twigs | 96.6 ± 0.06 *** | 91.8 ± 0.34 | 2.0 ± 0.07 *** | 14.4 ± 0.58 | 10.0 ± 0.35 *** | 1.4 ± 0.06 |
Synadenium cupulare δ | Leaves | 90.9 ± 0.70 *** | 46.0 ± 5.30 | 55.7 ± 0.35 | ND | 0.4 ± 0.02 | ND |
Tetradenia riparia δ | Leaves | 68.5 ± 1.39 *** | 23.8 ± 2.44 | 41.0 ± 5.29 | ND | 0.5 ± 0.06 | ND |
Trichilia dregeana # | Leaves & Twigs | 95.8 ± 0.46 ** | 92.3 ± 0.16 | 5.3 ± 0.02 *** | 14.6 ± 0.24 | 3.7 ± 0.01 *** | 1.3 ± 0.02 |
Ziziphus mucronata # | Leaves | 90.7 ± 0.42 ns | 89.0 ± 2.20 | 29.7 ± 1.02 ns | 30.9 ± 1.94 | 0.7 ± 0.02 ns | 0.6 ± 0.04 |
Ziziphus mucronata δ | Leaves | 91.1 ± 0.18 ns | 89.0 ± 2.20 | 18.1 ± 0.29 ** | 30.9 ± 1.94 | 1.1 ± 0.02 *** | 0.6 ± 0.04 |
Ascorbic acid | 96.6 ± 0.04 |  | 2.1 ± 0.05 |  | 9.4 ± 0.23 |  | |
Butylated hydroxytoluene | 93.2 ± 0.34 |  | 3.0 ± 0.04 |  | 6.5 ± 0.09 |  | |