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Table 4 Effect of long-term storage on antioxidant activity based on β -carotene bleaching model and acetylcholinesterase inhibitory properties of 21 South African medicinal plants

From: Antioxidant and acetylcholinesterase-inhibitory properties of long-term stored medicinal plants

Plant species Plant part(s) Antioxidant activity (%) at 200 μg/ml AChE inhibition (%) at 1.0 mg/ml
Stored Fresh Stored Fresh
Acokanthera oppositifolia δ Roots 54.7 ± 3.4 ns 40.0 ± 7.71 81.0 ± 12.11 ns 80.5 ± 1.99
Artemisia afra # Aerial parts 45.8 ± 3.34 ns 39.8 ± 4.94 83.2 ± 2.28 ns 89.6 ± 7.44
Artemisia afra δ Aerial parts 44.4 ± 7.20 ns 39.8 ± 4.94 89.8 ± 0.57 ns 89.6 ± 7.45
Buddleja salviifolia # Leaves 39.1 ± 7.69 ns 58.3 ± 3.04 64.9 ± 11.42 ns 72.5 ± 10.17
Buddleja salviifolia # Twigs 58.0 ± 3.92 ns 53.8 ± 8.22 73.0 ± 15.63 ns 63.9 ± 4.05
Clausena anisata # Leaves & Twigs 23.6 ± 4.06 ns 49.8 ± 11.19 77.0 ± 6.86 ns 82.2 ± 3.74
Cussonia spicata # Leaves 55.7 ± 6.45 ns 41.8 ± 4.70 72.1 ± 12.6 ns 86.5 ± 5.56
Dombeya rotundifolia # Leaves 51.8 ± 4.13 ns 58.9 ± 1.40 84.1 ± 5.54 ns 87.6 ± 2.88
Ekebergia capensis δ Leaves & Twigs 93.5 ± 7.05 ** 52.1 ± 4.97 73.8 ± 7.24 ns 89.7 ± 6.08
Leonotis intermedia δ Leaves 32.6 ± 5.34 * 52.9 ± 4.09 68.8 ± 3.12 * 87.8 ± 3.83
Leonotis leonurus δ Leaves 40.8 ± 2.32 ns 58.6 ± 7.13 78.1 ± 3.67 ns 73.2 ± 0.43
Merwilla plumbea δ Bulbs 57.0 ± 6.42 ns 45.1 ± 4.06 58.7 ± 6.52 ns 81.5 ± 2.11
Ocotea bullata δ Bark 57.8 ± 7.33 ns 62.3 ± 8.83 84.8 ± 3.98 ns 87.1 ± 2.63
Olea europaea # Leaves 48.8 ± 2.84 ns 48.2 ± 0.59 69.2 ± 5.99 ns 85.4 ± 3.39
Pittosporum viridiflorum # Leaves & Twigs 62.9 ± 6.65 ns 39.1 ± 6.80 96.2 ± 0.71 ns 70.5 ± 8.36
Plumbago auriculata δ Leaves 62.2 ± 10.87 ns 52.8 ± 1.99 82.3 ± 5.54 ns 87.3 ± 2.20
Protorhus longifolia δ Leaves 90.9 ± 8.88 ns 72.9 ± 2.62 51.8 ± 9.07 ns 40.07 ± 2.60
Solanum mauritianum δ Leaves 38.9 ± 10.07 ns 49.4 ± 4.92 78.5 ± 5.84 ns 85.9 ± 3.94
Spirostachys africana # Leaves & Twigs 62.1 ± 4.40 ns 58.3 ± 3.24 90.4 ± 5.57 ns 82.4 ± 3.51
Synadenium cupulare δ Leaves 54.5 ± 5.06 ns 45.3 ± 2.04 75.3 ± 4.07 ns 81.1 ± 2.77
Tetradenia riparia δ Leaves 67.2 ± 4.89 ns 64.5 ± 8.38 80.8 ± 1.73 * 65.4 ± 4.85
Trichilia dregeana # Leaves & Twigs 65.2 ± 7.46 ns 50.6 ± 8.81 94.8 ± 2.82 * 81.1 ± 3.99
Ziziphus mucronata # Leaves 54.5 ± 3.65 ns 42.6 ± 6.62 84.8 ± 6.78 ns 87.2 ± 10.04
Ziziphus mucronata δ Leaves 24.1 ± 11.13 ns 42.6 ± 6.62 90.4 ± 4.09 ns 87.2 ± 10.04
Galanthamine     84.1 ± 1.45   
Butylated hydroxytoluene   94.5 ± 1.71    
  1. ns = not significant; P = 0.05 (*); P = 0.01 (**); P = 0.001 (***).
  2. δ = Plant material stored for 16 years.
  3. # = Plant material stored for 12 years.
  4. Galanthamine (20 μM) was used as a positive control in acetylcholinesterase assay.