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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

From: Masquelier’s grape seed extract: from basic flavonoid research to a well-characterized food supplement with health benefits

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