Grape seeds account for 4%-7% of the weight of fresh grapefruit, the polyphenols in grape seeds are 10%-20%, and the oil content is about 12%-20%. The content of linoleic acid is as high as 78% in up to 92% of unsaturated fatty acids in the oil. What are the Active ingredients in Grape Seed Extract?
Grape seed extract contains a variety of active ingredients, including flavonoids, phenolic acids, anthocyanins, and oligomeric proanthocyanidin complexes (OPCs). OPCs are believed to be the most potent of the constituents and are responsible for many of the health benefits associated with grape seed extract.
According to different degrees of polymerization, proanthocyanidins are divided into oligomeric proanthocyanidins (OPCs) and high polymeric proanthocyanidins (PPCs). Grape seed proanthocyanidins dimers, trimers, tetramers, pentamers, and hexamers to
decamers. Two tetramers are oligomers. The oligomeric proanthocyanidins of grape seed extract have better biological activity, so the content of OPCs in GSE determines the quality of the product.
