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Assembly of oil-based microcapsules coated with proanthocyanidins as a novel carrier for hydrophobic active compounds.

Proanthocyanidins are sustainable materials with amphiphilic characteristic, network-forming capacity and health benefits, which give them possibility as encapsulating bio-materials. We found that proanthocyanidins from Chinese bayberry leaves and grape seeds (BLPs and GSPs) were able to encapsulate oil to form spherical microcapsules of controlled size and architecture. Microcapsules encapsulated with BLPs and GSPs (BMs and GMs) exhibited different physical stability when subjected to environmental stresses. BMs showed higher physical stability to environmental stresses than GMs. Proanthocyanidin shell could protect β-carotene from chemical degradation. Subsequently, varied gastrointestinal behaviors of the microcapsules were observed in simulated digestion. GMs with low stability reduced the lipid digestion and β-carotene bioaccessibility. BMs with high stability retarded lipid digestion, but didn't change the amount of hydrolyzed lipids and β-carotene bioaccessibility. Our study demonstrates that BLPs, rather than GSPs can be used alone as encapsulating material for protection and targeted delivery of lipophilic bioactive compounds.