Table 3 Mean quantities ± standard deviation (SD) of monomeric and oligomeric flavan-3-ols of 10 batches of Masquelier’s grape seed extract measured by high performance liquid chromatography (HPLC, see also Fig. 4). The data were provided by the extract’s manufacturer
Compound | Mean quantity ± SD (% (w/w)) |
|---|---|
Total monomers | 25.6 ± 2.2 |
(+)-catechin | 10.9 ± 1.6 |
(-)-epicatechin | 12.2 ± 1.6 |
(-)-epicatechin-3-O-gallate | 2.5 ± 1.6 |
Total dimers | 27.5 ± 1.6 |
Procyanidin B1 | 7.7 ± 1.6 |
(-)-epicatechin-(4 β → 8)-(+)-catechin | |
Procyanidin B2 | 8.3 ± 1.6 |
(-)-epicatechin-(4β → 8)-(-)-epicatechin | |
Procyanidin B3 | 2.8 ± 1.6 |
(+)-catechin-(4α → 8)-(+)-catechin | |
Procyanidin B4 | 1.6 ± 1.6 |
(+)-catechin-(4α → 8)-(-)-epicatechin | |
Procyanidin B2-gallate | 7.1 ± 1.6 |
Total tri-, tetra- and pentameric proanthocyanidins | 46.9 ± 1.6 |