A reversed-phase HPLC method was
developed to chromatographically “fingerprint” pine bark and
grape seed extracts and to identify oligomeric proanthocyanidin
monomers, dimers, and trimers. While several reversed-phase
HPLC methods (36, 37, 40, 41) have been reported for grape
seed extract oligomeric proanthocyanidins, there was only one
reported pine bark extract method