Fermenting whey protein with specific bacteria and yeast produces novel peptides with ACE-inhibitory, antioxidant, and anti-inflammatory properties in lab tests.
2 novel bioactive peptidesAFLDSRTR and ILGAFIQIITFR — identified from fermented whey — showed ACE inhibition, antioxidant properties, and anti-inflammatory activity in lab tests
What the researchers found
Researchers fermented whey protein concentrate using a co-culture of Lactobacillus paracasei and Saccharomyces cerevisiae (yeast) and identified novel peptides with ACE-inhibitory (blood pressure lowering), antioxidant, and anti-inflammatory properties. Maximum proteolytic activity was 6.50 mg/mL at 37°C and 8.59 mg/mL at 25°C after 48 hours of fermentation.
Two specific peptides — AFLDSRTR and ILGAFIQIITFR — were identified and characterized. Molecular docking showed they interact with human myeloperoxidase, an enzyme involved in inflammation. The whey fermentate also reduced inflammation in macrophage cell cultures exposed to bacterial toxins (LPS).
Why it matters
Whey protein is already one of the most widely consumed protein supplements. This study shows that fermenting it with specific bacteria and yeast produces bioactive peptides that could lower blood pressure, fight oxidative stress, and reduce inflammation — potentially turning a common protein supplement into a functional food with cardiovascular benefits.
The numbers in context
Proteolytic activity: 6.50 mg/mL (37°C) and 8.59 mg/mL (25°C) at 48h · Protein range: 10-70 kDa · Key peptides: AFLDSRTR, ILGAFIQIITFR · Tested at 12, 24, 36, 48h intervals · Inoculation rates: 1.5%, 2.0%, 2.5%
How the study worked
Whey protein concentrate was co-fermented with Lactobacillus paracasei (at 37°C) and Saccharomyces cerevisiae (at 25°C) at varying time points and inoculation rates. Bioactive peptides were separated using RP-HPLC and identified by mass spectrometry. ACE inhibition, antioxidant activity, and anti-inflammatory effects were tested in vitro. Anti-inflammatory activity was assessed on RAW 264.7 macrophages stimulated with LPS. Molecular docking simulated peptide-enzyme interactions.
Who was studied
Not applicable (in vitro and in silico study)
What this study cannot tell us
Entirely in vitro and in silico — no animal or human studies. ACE inhibition in a test tube doesn't guarantee blood pressure reduction in people. The peptides may be digested before reaching their targets when consumed orally. Molecular docking predicts binding but doesn't confirm biological activity in vivo.
How to read the evidence
This is an in vitro and in silico study with no animal or human data. While the methodology is thorough (multiple analytical techniques, cell-based assays, molecular docking), the lack of in vivo validation limits the evidence strength.
When this study was published
Published in 2023, this is recent research in the active field of food-derived bioactive peptides. The identified peptides would need animal and human studies to validate the in vitro findings.
The bigger picture
This study is part of a growing field called food-derived bioactive peptides, where researchers look for drug-like compounds hidden in common foods. Dairy-derived ACE-inhibitory peptides (like those in fermented milk) have been studied for decades, and some have made it into commercial products. This work adds whey protein fermentate to the list of potential sources for naturally-derived blood pressure-lowering peptides.
Questions still open
- Do these whey-derived peptides survive digestion and reach the bloodstream intact when consumed orally?
- Would fermented whey protein show measurable blood pressure reduction in a human clinical trial?
- How do these peptides compare in potency to established dairy-derived ACE inhibitors like lactotripeptides (VPP and IPP)?
Common questions
Can fermented whey protein lower blood pressure?
What are ACE-inhibitory peptides and how do they relate to blood pressure medications?
Read the original research
Purification and Characterization of Novel Antihypertensive and Antioxidative Peptides From Whey Protein Fermentate: In Vitro, In Silico, and Molecular Interactions Studies.
Journal of the American Nutrition Association, 42(6), 598-617
Citation
Chopada, Keval; Basaiawmoit, Bethsheba; Sakure, Amar A; Maurya, Ruchika; Bishnoi, Mahendra; Kondepudi, Kanthi Kiran; Solanki, Divyang; Singh, B P; Padhi, Srichandan; Rai, Amit Kumar; Liu, Zhenbin; Mishra, B K; Hati, Subrota. (2023). Purification and Characterization of Novel Antihypertensive and Antioxidative Peptides From Whey Protein Fermentate: In Vitro, In Silico, and Molecular Interactions Studies.. Journal of the American Nutrition Association, 42(6), 598-617. https://doi.org/10.1080/27697061.2022.2110966