The structure-dependent influence of high pressure processing on polyphenol-cell wall material (CWM) interactions and polyphenol-polyphenol association in model systems: Possible implication to accessibility

Polyphenolic compounds are known to interact with cell wall materials (CWM) and other polyphenols by hydrogen bonds and hydrophobic interactions. The impact of pressure on such interactions was studied in mono- and multi-component model systems. The results reveal that pressure affects polyphenol–CWM and polyphenol-polyphenol interactions. Pressure can induce, depending on pH and polyphenol structure, self-association of hydrophobic polyphenols (a 55% decrease in free form was observed for kaempferol in the mono-component system) and also increase their interaction with CWM. In contrast, as was observed for some more hydrophilic polyphenols, pressure can result in de-complexation. CWM mostly induced de-complexation of the identified polyphenols in the multi-component model. The antioxidant capacity of such a system increased by pressure and CWM by up to 53%. While for the aglycone the binding to CWM was correlated with the simulated bioaccessibility in the gastric phase, no such trend was observed for the glycosides.