Pea peptides (PP) have reported hypoglycemic and antioxidant potential but are vulnerable to degradation from pH changes, heat, and digestive enzymes. The authors developed a multifunctional hybrid delivery system intended to protect PP during gastric transit and release them in the intestine while retaining biological activity. The design uses a two-level or "double fence" approach combining modified sodium alginate nanoparticles and sodium alginate hydrogel beads.
The carrier strategy began with a ferulic acid-modified sodium alginate (FA-SA) conjugate. FA-SA was employed to encapsulate pea peptides and produce FA-SA-PP nanoparticles (NPs). These nanoparticles were then loaded into sodium alginate (SA) hydrogel beads to produce the composite system termed FA-SA-PP NPs@SA HBs. The hybrid system thereby integrates nanoparticulate encapsulation and hydrogel bead encapsulation as sequential protective layers.
The FA-SA-PP nanoparticles served as the first protective layer (the I-level fence) for PP. Encapsulation efficiency (EE) for pea peptides within these nanoparticles was reported as 99.69% in the abstract, indicating near-complete peptide entrapment at the nanoparticle stage. The use of ferulic acid modification of sodium alginate is highlighted as a key formulation feature for producing these peptide-loaded nanoparticles.
To add a second protective barrier, the FA-SA-PP NPs were incorporated into SA-based hydrogel beads. The final composite beads, FA-SA-PP NPs@SA HBs, achieved an overall encapsulation efficiency reported as 99.87%. This second-level fence is intended to protect the nanoparticle-encapsulated peptides during passage through the stomach and to control release in the intestinal environment.
According to the abstract, FA-SA-PP NPs@SA HBs demonstrated good stability in simulated gastric fluid (SGF). Upon transfer to simulated intestinal fluid (SIF), the hydrogel beads gradually swelled and released the FA-SA-PP nanoparticles, consistent with an intestinal-targeted release profile. Detailed quantitative release kinetics, pH-triggered swelling data, and specific incubation times or enzyme conditions were not provided in the PubMed abstract and require consultation of the full text for methodological specifics.
The authors report that digestion products derived from FA-SA-PP NPs@SA HBs retained antioxidant activity and DPP‑IV inhibitory activity after simulated digestion. These retained activities suggest that the hybrid delivery system can protect functional peptides through the digestive process and preserve their biochemical effects relevant to oxidative stress mitigation and glycemic regulation. The abstract does not specify the assays used, activity magnitudes, or comparative controls; those experimental details are in the full article.
The study frames the hybrid construct as a "double fence" protective mechanism: an inner nanoparticle fence (FA-SA-PP NPs) and an outer hydrogel bead fence (SA HBs). This layered approach aims to (1) shield pea peptides from destabilizing conditions, (2) enable targeted intestinal release, and (3) maintain peptide bioactivity post-digestion. The authors suggest the combined antioxidant and hypoglycemic functions make the system promising for nutritional intervention in diabetes and for reducing oxidative stress damage.
The authors declared no known competing financial interests or personal relationships that could have influenced the reported work. Keywords listed in the abstract include: Delivery system; Hydrogel beads; Hypoglycemic; Nanoparticles; Pea peptides.
Notes on limitations of the abstract-only source
The PubMed entry provides an abstract-level summary and key metrics such as encapsulation efficiencies and retained activities but does not report detailed experimental procedures, release kinetics, numerical activity results, statistical analyses, or any in vivo evaluations. For full experimental methods, assay protocols and quantitative outcomes, readers should consult the full text via the journal Food Chemistry (DOI: 10.1016/j.foodchem.2026.150245).