Quinoa showed the highest protein digestibility (80.5%) and released the most potent ACE-inhibitory peptides, while oat and quinoa released the highest percentage of potentially bioactive peptides overall.
Quinoa: most potentHighest digestibility (80.5%), strongest ACE inhibition, and 22.8% bioactive peptide release among 5 plant proteins tested
What the researchers found
Quinoa: highest digestibility (80.49%), strongest ACE inhibition (IC50 0.90 mg/mL). Oat released the most bioactive peptide candidates (30.89%). Over 93% of quinoa digested peptides were under 1 kDa. Globular proteins were the primary source of bioactive peptides.
Why it matters
As plant-based diets grow, understanding which plant proteins deliver the most health-promoting peptides during digestion helps guide nutritional recommendations. Finding that quinoa and oat produce the most bioactive peptides supports their status as premium plant protein sources.
The numbers in context
Quinoa: 80.49% digestibility, followed by pea, soybean, chickpea, and oat (79.25-70.89%).
How the study worked
In vitro pepsin-pancreatin digestion model. Characterized 5 plant protein beverages for digestibility, amino acid scores (DIAAS), antioxidant activity (DPPH, ABTS), ACE inhibitory activity, and peptidomics using PeptideRanker and BIOPEP database screening.
Who was studied
Five plant protein beverages (soybean, chickpea, pea, oat, quinoa) in simulated digestion
What this study cannot tell us
In vitro digestion model may not fully replicate human gut conditions. Bioactive peptide predictions from databases need in vivo validation. Processing methods for plant beverages affect protein structure and digestibility. Individual variation in digestion is not captured.
How to read the evidence
Preliminary evidence: in vitro digestion study with comprehensive peptidomic analysis, but bioactive peptide predictions need in vivo validation.
When this study was published
Published in 2024. Provides the first comparative peptidomic characterization of major plant protein beverages.
The bigger picture
Food-derived bioactive peptides are a growing area connecting nutrition to health outcomes. This study provides evidence-based ranking of plant proteins by their ability to generate blood pressure-lowering and antioxidant peptides during digestion, supporting the development of functional foods designed to deliver health benefits beyond basic nutrition.
Questions still open
- Do the bioactive peptides identified in vitro survive absorption and show effects in human studies?
- Could plant protein processing be optimized to maximize bioactive peptide release during digestion?
- Do regular consumers of quinoa and oat show lower blood pressure compared to other plant protein consumers?
Common questions
Which plant protein is best for bioactive peptides?
What are ACE-inhibitory peptides?
Read the original research
In vitro protein digestive properties and peptidomic characterization of five whole component plant protein beverages using a pepsin-pancreatin model.
Food research international (Ottawa, Ont.), 196, 115076
Citation
Zhao, Junna; Kong, Xiangzhen; Zhang, Caimeng; Hua, Yufei; Chen, Yeming; Li, Xingfei. (2024). In vitro protein digestive properties and peptidomic characterization of five whole component plant protein beverages using a pepsin-pancreatin model.. Food research international (Ottawa, Ont.), 196, 115076. https://doi.org/10.1016/j.foodres.2024.115076