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.