Fig. 4From: Polymeric nanoparticles (PNPs) for oral delivery of insulinSchematic diagrams of prefunctionalization and PSM of MOFs. a Pre-functionalization: Functional ligands are made by substituting the organic ligand with specified substituents and then directly incorporating the changed ligand into MOFs for functionalization. b PSM: Starting MOFs synthesized using unmodified organic ligands, which were then functionalized by adding new functional groupsBack to article page