Abstract
A novel delivery system using micron-scale grape skin powder (GSP) was developed that enhanced loading, stability and bioaccessibility of trans-resveratrol (trans-Res). Vacuum assisted infusion of GSP results in a high yield (~1 mg/g) of trans-Res and improved photostability of infused trans-Res in GSP exposed to UV-A light. The release of trans-Res from GSP was ~ 45% during gastric digestion and the total release in the intestinal phase during sequential digestion processes using low and high bile salts was ~ 70% and ~ 90%, respectively. Moreover, the release of endogenous polyphenols in GSP during simulated gastrointestinal digestion was similar to the release profile of infused resveratrol, suggesting strong interactions of infused resveratrol with the GSP matrix. In summary, this research illustrates a novel approach to utilize food by-products to enhance stability and bioaccessibility of bioactive compounds.
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