Polyphenol interactions. Part 2. Covalent binding of procyanidins to proteins during acid-catalysed decomposition; observations on some polymeric proanthocyanidins
The kinetics of the acid-catalysed decomposition of some procyanidins are determined. The reactions are specific acid-catalysed. The rate-determining step is that of the initial protonation of the procyanidin. The relevance of this degradation to haze formation in certain beverages is discussed. The structure of some polymeric proanthocyanidins is briefly commented upon in the light of this work.