Sustainable Supramolecular Extraction of Phytocomplexes from Microgreens and Their Eco-Loading in Nutriosomes: Physicochemical Characterization, Stability, and In Vitro Release Behavior

This study reports a dual green strategy for obtaining and stabilizing phytocomplexes from Sango radish and kale microgreens. Phytochemicals were isolated through supramolecular extraction, which generated an upper amphiphilic phase and a lower aqueous phase, enabling the recovery of both hydrophilic and lipophilic molecules without toxic solvents. The resulting phytocomplexes were encapsulated in nutriosomes, phospholipid vesicles enriched with the soluble dextrin Nutriose® FM06, and compared with conventional liposomes. The vesicles displayed mean diameters ≤ 110 nm, polydispersity indices < 0.11, and zeta potentials around −40 mV. Retention of antioxidant activity reached up to 99%. Freeze-dried formulations maintained acceptable physicochemical properties and microbiological safety, while storage studies confirmed stability over six months. In vitro release tests showed a gradual release of phenolics and carotenoids, and simulated digestion experiments indicated that nutriosomes preserved up to 20% more antioxidant capacity than liposomes in the intestinal phase. These results demonstrate an environmentally responsible strategy to prepare phytocomplex-rich vesicles with improved stability and bioaccessibility. Further biological and in vivo studies are needed to substantiate potential nutritional or health-related benefits.