Abstract
The use of pulsed electric field (PEF) to improve functional and nutritional aspects of a plant-based yogurt alternative (PBYA) was explored for the first time. A blended oat and pea protein dispersion was subjected to mild preheating (30–40°C, 24 s) and PEF at various conditions (0–217 kJ/L, 10 kV/cm). A drastic increase in net surface charge as indicated by a significant decrease in ζ-potential, was observed and suggested that PEF (≥77 kJ/L) led to protein structural changes that render a stabilizing effect to the oat-pea dispersion. Following lactic acid fermentation (Lactiplantibacillus plantarum 299v, 35°C, 10 h), PEF-treated oat-pea dispersion (≥162 kJ/L) developed a semi-solid, brittle gel texture, characterized by increased hardness, decreased cohesiveness, and the emergence of fracture peaks. Moreover, combining PEF (205 kJ/L at 40°C) and fermentation led to a complementary reduction in antinutrients (phytic acid and trypsin inhibitors) and a subsequent increase in the in vitro digestibility of oat-pea protein by up to 16.1%, estimated based on an applied fractional conversion first-order kinetic model. Combined PEF and fermentation allowed protein gelation to occur and promoted protein digestibility of the resulting oat-pea yogurt alternative. This study demonstrates a promising application of PEF in modifying the texture and digestive properties of protein-rich PBYA products.
• PEF with preheating was used as a pasteurization alternative for PBYA.
• PEF stabilized oat-pea dispersions indicating protein structural changes.
• PEF induced the formation of semi-solid textures during fermentation.
• Combined PEF and lactic acid fermentation improved protein digestibility by 16%.