Table 2

Effect of long-term storage on the condensed tannin, free gallic acid and gallotannin contents of 21 South African medicinal plants
Plant name Plant part(s) Condensed tannins (% in dry matter) Free gallic acid (μg GAE/g DW) Gallotannins (μg GAE/g DW)
Stored Fresh Stored Fresh Stored Fresh
Acokanthera oppositifoliaδ Roots 0 0 2.996 ± 2.9963 ns 1.284 ± 1.2841 32.960 ± 0.4281 * 60.355 ± 6.4207
Artemisia afra# Aerial parts 0.078 ± 0.0005 *** 0 0 0 76.621 ± 6.4207 ns 97.167 ± 10.7012
Artemisia afraδ Aerial parts 0.004 ± 0.0002 * 0 0 0 27.823 ± 11.5573 * 97.167 ± 10.7012
Buddleja salviifolia# Leaves 0.011 ± 0.0002 * 0.056 ± 0.0073 29.535 ± 20.1183 ns 0 80.720 ± 17.0557 ns 41.949 ± 1.7122
Buddleja salviifolia# Twigs 0.017 ± 0.0047 ns 0.005 ± 0.0050 17.122 ± 3.4244 ns 8.133 ± 5.5646 14.982 ± 8.1329 ns 38.096 ± 17.5500
Clausena anisata# Leaves & Twigs 1.394 ± 0.0318 ns 1.329 ± 0.0159 0 0 68.488 ± 5.1366 ** 0
Cussonia spicata# Leaves 0.012 ± 0.0016 * 0 138.260 ± 41.5208 ns 12.842 ± 12.8415 397.377 ± 55.8931 ns 468.758 ± 81.3346
Dombeya rotundifolia# Leaves 1.804 ± 0.0116 ** 0.973 ± 0.0529 0 0 41.949 ± 19.6903 ns 0
Ekebergia capensisδ Leaves & Twigs 0.654 ± 0.0040 ns 0.523 ± 0.0706 0 0 0 ** 19.690 ± 2.5683
Leonotis intermediaδ Leaves 0.008 ± 0.0007 ** 0 0 ns 3.424 ± 3.4244 17.550 ± 5.5646 ns 11.129 ± 4.2805
Leonotis leonurusδ Leaves 0.011 ± 0.0002 *** 0 0 *** 47.085 ± 1.7122 24.827 ± 0.8561 * 5.565 ± 3.8524
Merwilla plumbeaδ Bulbs 0 0 8.133 ± 8.1329 ns 23.971 ± 7.7049 167.367 ± 13.2695 ND
Ocotea bullataδ Bark 1.154 ± 0.0162 ** 0.699 ± 0.0354 0 0 68.060 ± 8.9890 * 14.982 ± 7.2768
Olea europaea# Leaves 0.010 ± 0.0019 * 0 0 0 127.559 ± 4.2805 ns 121.566 ± 1.7122
Pittosporum viridiflorum# Leaves & Twigs 0 0 5.565 ± 5.5646 ns 0 75.337 ± 0.8561 ns 66.776 ± 6.8488
Plumbago auriculataδ Leaves 0.003 ± 0.0011 ** 0.024 ± 0.0013 3.852 ± 3.8524 ns 0 20.118 ± 5.5646 ns 4.7085 ± 4.7085
Protorhus longifoliaδ Leaves 0.400 ± 0.0127 ns 0.724 ± 0.0885 2398.787 ± 112.1485 ns 1901.394 ± 137.8318 2726.245 ± 615.9627 ns 4039.926 ± 1368.0443
Solanum mauritianumδ Leaves 0.013 ± 0.0013 ns 0.005 ± 0.005 32.103 ± 4.7085 ns 23.971 ± 0.8561 183.047 ± 75.6858 ND
Spirostachys africana# Leaves & Twigs 0.348 ± 0.0083 ns 0.365 ± 0.0311 1107.363 ± 228.1501 * 0 2445.016 ± 118.1414 ** 16.266 ± 16.2659
Synadenium cupulare# Leaves 0.010 ± 0.0002 ** 0.004 ± 0.0004 0 ns 8.561 ± 8.5610 20.546 ± 4.2805 ns 54.362 ± 21.8305
Tetradenia ripariaδ Leaves 0.002 ± 0.0004 ns 0.005 ± 0.0022 0 *** 14.982 ± 0.4280 11.985 ± 1.7122 ns 22.259 ± 13.6976
Trichilia dregeanaδ Leaves & Twigs 0.198 ± 0.0099 ns 0.138 ± 0.0148 118.998 ± 5.1366 ** 0 442.603 ± 65.0634 * 13.270 ± 1.2841
Ziziphus mucronata# Leaves 0.008 ± 0.0000 *** 0.046 ± 0.0013 0 0 38.953 ± 12.4134 ns 28.679 ± 1.2842
Ziziphus mucronataδ Leaves 0.077 ± 0.0003 ** 0.046 ± 0.0013 0 0 47.085 ± 17.1220 ns 28.679 ± 1.2842

ns = not significant; P = 0.05 (*); P = 0.01 (**); P = 0.001 (***); ND = not determined; GAE = Gallic acid equivalents.

δ = Plant material stored for 16 years.

# = Plant material stored for 12 years.

Amoo et al.

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

Open Data