Grape, which has a long history in china, is widely cultivated with an increasing production in recent years. As the by-product of grape juice and wine making, grape seeds are a rich source of procyanidins (a kind of natural antioxidants), but due to the hard hull, they are usually discarded as unwanted or used as crude feed, which is a waste of resources. For better use of the grape seeds, it is of great importance to analysis the procyanidins in grape seeds and study its biological activities and extracti...