Emulsion gels and oil-filled aerogels as curcumin carriers: Nanostructural characterization of gastrointestinal digestion products

•Agar and κ-carrageenan oil-filled gel-like structures are useful as curcumin carriers.•Agar emulsion gels showed smaller and more homogeneously distributed oil droplets.•After simulated gastrointestinal digestion bile salt lamellae/micelles were produced.•Larger vesicles of partially digested oil were also generated.•Polysaccharide type and physical state affect the digestion products’ structures.