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Table 1 Effect of long-term storage on the total iridoid, phenolic and flavonoid contents of 21 South African medicinal plants

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

Plant name Family Voucher number Plant part(s) Total iridoids (μg HE/g DW) Total phenolics (mg GAE/g DW) Total flavonoids (mg CE/g DW)
Stored Fresh Stored Fresh Stored Fresh
Acokanthera oppositifolia (Lam.) Coddδ Apocynaceae A. Aremu 1 NU Roots 264.6 ± 4.82 ** 134.5 ± 5.51 7.5 ± 0.37 * 9.3 ± 0.44 4.8 ± 0.12 * 5.4 ± 0.17
Artemisia afra Jacq. ex Willd# Asteraceae S. Amoo 15 NU Aerial parts 356.9 ± 22.72 ns 341.7 ± 19.97 28.5 ± 1.15 ns 25.8 ± 0.03 18.3 ± 0.65 ns 16.7 ± 0.34
Artemisia afra Jacq. ex Willdδ Asteraceae S. Amoo 15 NU Aerial parts 195.1 ± 63.35 ns 341.7 ± 19.97 34.7 ± 1.79 ** 25.8 ± 0.03 19.7 ± 0.87 * 16.7 ± 0.34
Buddleja salviifolia (L.) Lam# Buddlejaceae S. Amoo 16 NU Leaves 60.8 ± 15.84 ** 409.9 ± 13.77 9.0 ± 0.36 *** 20.0 ± 0.81 6.6 ± 0.28 *** 14.6 ± 0.32
Buddleja salviifolia (L.) Lam# Buddlejaceae S. Amoo 16 NU Twigs 111.1 ± 9.64 ** 400.3 ± 27.54 8.3 ± 0.25 *** 11.1 ± 0.24 5.0 ± 0.25 * 5.9 ± 0.11
Clausena anisata (Willd.) Hook. F. ex Benth# Rutaceae S. Amoo 18 NU Leaves & Twigs 3019.6 ± 63.35 ns 3264.7 ± 96.40 31.3 ± 0.05 * 28.1 ± 0.99 11.7 ± 0.17 *** 7.6 ± 0.20
Cussonia spicata Thunb. # Araliaceae S. Amoo 09 NU Leaves 82.8 ± 39.25 ns 38.8 ± 11.71 11.4 ± 0.16 ** 7.6 ± 0.69 9.1 ± 0.53 *** 3.4 ± 0.27
Dombeya rotundifolia Hochst. # Malvaceae S. Amoo 11 NU Leaves 7076.6 ± 177.64 ** 9499.6 ± 117.75 45.3 ± 0.89 ns 47.3 ± 1.94 29.7 ± 3.05 ns 35.4 ± 0.87
Ekebergia capensis Sparrmδ Meliaceae S. Amoo 23 NU Leaves & Twigs 547.6 ± 22.03 *** 2221.5 ± 53.02 31.7 ± 1.29 *** 44.9 ± 0.78 22.8 ± 1.25 ns 26.0 ± 0.29
Leonotis intermedia Lindl.δ Lamiaceae S. Amoo 08 NU Leaves 56.0 ± 1.38 * 72.5 ± 2.75 15.1 ± 0.57 ** 11.6 ± 0.23 12.1 ± 0.38 *** 6.8 ± 0.10
Leonotis leonurus (L.) R.Br.δ Lamiaceae S. Amoo 12 NU Leaves 51.8 ± 1.38 ns 171.0 ± 30.99 10.5 ± 0.22 *** 18.2 ± 0.76 6.6 ± 0.23 *** 10.3 ± 0.01
Merwilla plumbea (Lindl.) Septaδ Hyacinthaceae S. Amoo 21 NU Bulbs 64.2 ± 8.26 ns 207.5 ± 75.74 7.8 ± 0.29 ** 9.8 ± 0.25 1.4 ± 0.09 ns 1.7 ± 0.37
Ocotea bullata (Burch.) Baill.δ Lauraceae S. Amoo 13 NU Bark 3060.9 ± 121.19 ** 6112.6 ± 207.95 32.7 ± 0.82 ** 46.4 ± 2.00 18.4 ± 0.62 *** 26.8 ± 0.50
Olea europaea L.# Oleaceae S. Amoo 14 NU Leaves 0 ns 283.2 ± 79.87 17.2 ± 0.41 * 18.7 ± 0.06 13.1 ± 0.31 *** 9.7 ± 0.28
Pittosporum viridiflorum Sims# Pittosporaceae S. Amoo 24 NU Leaves & Twigs 63.6 ± 8.95 ns 194.4 ± 65.41 10.6 ± 0.20 *** 26.0 ± 0.91 5.3 ± 0.12 *** 15.6 ± 0.22
Plumbago auriculata Lam.δ Plumbaginaceae S. Amoo 06 NU Leaves 9.8 ± 7.57 ** 521.4 ± 50.95 7.6 ± 0.66 *** 15.0 ± 0.46 1.3 ± 0.15 ** 5.5 ± 0.64
Protorhus longifolia (Bernh.) Engl.δ Anacardiaceae S. Amoo 19 NU Leaves 1034.4 ± 47.51 ** 7787.2 ± 290.57 51.8 ± 1.27 *** 114.4 ± 7.83 10.1 ± 0.65 *** 18.3 ± 0.10
Solanum mauritianum S cop.δ Solanaceae S. Amoo 07 NU Leaves 71.1 ± 6.89 * 14.0 ± 11.71 8.0 ± 0.11 *** 13.9 ± 0.24 2.0 ± 0.21 ns 1.5 ± 0.05
Spirostachys africana Sond.# Euphorbiaceae S. Amoo 26 NU Leaves & Twigs 553.8 ± 3.44 ns 527.6 ± 11.71 86.2 ± 1.91 ** 69.1 ± 2.13 8.5 ± 0.09 *** 26.7 ± 0.57
Synadenium copulare (Boiss.) L.C. Wheelerδ Euphorbiaceae S. Amoo 25 NU Leaves 11.9 ± 11.02 ns 273.6 ± 71.61 8.5 ± 0.37 *** 15.2 ± 0.33 4.2 ± 0.15 ns 4.3 ± 0.15
Tetradenia riparia (Hochst.) Coddδ Lamiaceae S. Amoo 20 NU Leaves 46.3 ± 9.64 * 0 6.1 ± 0.20 ns 7.2 ± 0.38 2.7 ± 0.08 *** 1.5 ± 0.02
Trichilia dregeana Sond.δ Meliaceae S. Amoo 22 NU Leaves & Twigs 431.9 ± 16.53 ns 412.0 ± 50.27 34.4 ± 10.26 ns 32.6 ± 1.17 8.7 ± 0.61 *** 20.2 ± 0.19
Ziziphus mucronata Willd.# Rhamnaceae S. Amoo 17 NU Leaves 314.2 ± 37.87 ns 412.7 ± 22.03 23.6 ± 1.61 ** 33.4 ± 0.62 7.1 ± 0.10 *** 9.0 ± 0.09
Ziziphus mucronata Willd.δ Rhamnaceae S. Amoo 17 NU Leaves 90.4 ± 1.38 ** 412.7 ± 22.03 19.7 ± 0.42 *** 33.4 ± 0.62 6.9 ± 0.34 ** 9.0 ± 0.09
  1. ns = not significant; P = 0.05 (*); P = 0.01 (**); P = 0.001 (***).
  2. HE = harpagoside equivalents; GAE = gallic acid equivalents; CE = catechin equivalents.
  3. δ = Voucher number of plant material stored for 16 years was as described by Jäger et al. (1996); # = Voucher number of plant material stored for 12 years was as described by McGaw et al. (2000).
  4. Merwilla plumbea (Lindl.) Speta was formerly known as Scilla natalensis Planch.