Germination-tunable structural remodeling of LAB-fermented soymilk gels: Unraveling gastrointestinal digestive fate and bioactive peptide release.
Soymilk gels are getting a makeover, and bioactive peptides are the star of the show. A team at Nanjing Agricultural University just mapped out how tweaking the germination time of soybeans can ramp up peptide release from LAB-fermented soymilk gels during digestion. The trick? Simple: let the beans sprout for two days before fermentation.
Food Chem
by Wang Y, Wang Y, Yao Z et al.
“Germination-tunable structural remodeling of LAB-fermented soymilk gels: Unraveling gastrointestinal digestive fate and bioactive peptide release. Wang Y(1), Wang Y(1), Yao Z(1), Rui X(1), Wang P(1), Xie C(1), Yang R(2). Author information: (1)Sanya Institute of Nanjing Agricultural University, Whole Grain Food Engineering Research Center, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China. (2)Sanya Institute of Nanjing Agricultural University, Whole Grain Food Engineering Research Center, College of Food Science and Technology, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China. Electronic address: yangrq@njau.edu.cn. This study explores how germination duration affects the structure and gastrointestinal digestion of LAB-fermented soymilk gels. Soybeans germinated for 0-3 days were fermented, with their rheology, microstructure, intermolecular interactions, and in vitro digestion analyzed. Germination weakened gel viscoelasticity, increased pore size, and shifted the dominant forces from hydrogen bonds to hydrophobic interactions. This is likely due to the higher endogenous proteases and 7S/11S ratio. Germination-derived gels (especially 2-3 days) disintegrated faster in the stomach, released more soluble protein in the intestine, and produced more peptides. Peptidomic analysis revealed that 2-day germination (fermented soft gel, FSG) yielded the most bioactive peptides via targeted subunit degradation, while 3-day germination (fermented ultrasoft gel, FUG) caused over-hydrolysis, leading to loss of specific bioactive motifs. These findings demonstrate that controlled germination time (2-day) optimizes LAB-fermented gel structure to improve digestive efficiency and bioactive peptide release, providing a novel strategy for designing plant-based dairy. Copyright © 2026 Elsevier Ltd. All rights reserved. Conflict of interest statement: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.”
Here’s what they found. Germinating soybeans for 0–3 days before turning them into soymilk gels with lactic acid bacteria changes everything. Rheology and microstructure shift. Gels get softer, pores get bigger, and the internal glue moves from hydrogen bonds to hydrophobic interactions. All this comes down to more active proteases and a changed protein ratio in the beans.
Why does this matter for peptide researchers?
Softer, 2-day germinated gels (called fermented soft gel, or FSG) break down faster in the stomach.
This leads to more protein and, crucially, more bioactive peptide release in the intestine.
Peptidomics showed 2-day FSG had the highest diversity and abundance of bioactive motifs thanks to targeted protein breakdown.
Three days of germination (fermented ultrasoft gel, or FUG) went too far—over-hydrolysis broke down some of the most interesting peptide sequences.
Key takeaway: dialing in germination time unlocks new ways to optimize plant-based protein gels for peptide yield. Controlled two-day germination hits the sweet spot for maximizing bioactive peptide release during digestion. For anyone designing plant-based dairy alternatives or researching new peptide sources, this is a practical roadmap.
Fermented soymilk gels aren’t just a vegan yogurt hack—they’re a real candidate for tailored peptide research. Keep an eye on germination; it’s more powerful than it looks.
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