Bio-accessibility of bioactive compounds (ACE inhibitors and antioxidants) from extruded maize products added with a red seaweed Porphyra columbina

•Expansion, specific volume, L* and b* decreased with Porphyra columbina (P) addition.•The most suitable addition rate of seaweed was 3.5 g 100 g−1 (MP).•MP had higher protein and total dietary fiber contents than maize alone.•Antioxidant activity of MP was preserved after digestion treatment.•MP showed higher accessible compounds with antioxidant and ACE inhibition than M.

An expanded maize product added with red seaweeds Porphyra columbina (3.5 g 100 g−1) was developed and bio-accessibility of minerals and bioactive compounds such as ACE inhibitors and antioxidants provide by algae were evaluated using a pepsin/pancreatin digestion and equilibrium dialysis method. Extruded maize added with red seaweed showed higher dialyzability of ACE inhibitor compounds (41.0% ACE inhibition), total phenolic content (0.83 mg gallic acid/g dialysate) and antioxidant capacity (36.6% DPPH inhibition, 2.4 mM TEAC, power reduction and 99.4% copper-chelating activity) than extruded maize. Results about bio-accessibility of bioactive compounds provided by red edible seaweeds may help food technologists to tailor new bio-functional foods, such as functional snacks.