Table 1

Effect of long-term storage on the total iridoid, phenolic and flavonoid contents of 21 South African 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 Scop.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

ns = not significant; P = 0.05 (*); P = 0.01 (**); P = 0.001 (***).

HE = harpagoside equivalents; GAE = gallic acid equivalents; CE = catechin equivalents.

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).

Merwilla plumbea (Lindl.) Speta was formerly known as Scilla natalensis Planch.

Amoo et al.

Amoo et al. BMC Complementary and Alternative Medicine 2012 12:87   doi:10.1186/1472-6882-12-87

Open Data