Development and rheological characterization of a functional vegan mayonnaise enriched with fermented grape pomace powder and grape seed oil
This study demonstrates that a functional vegan mayonnaise enriched with 0.25% fermented grape pomace powder and formulated with sunflower oil achieves rheological and textural properties comparable to commercial full-fat mayonnaise, whereas the use of grape seed oil results in a weaker emulsion structure, highlighting the critical influence of oil type on the stability of waste-repurposed functional food products.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
The Big Idea: Turning Wine Waste into a Better Mayo
Imagine you have a jar of wine grapes. After the winemaker squeezes out the juice, they are left with a pile of skins, seeds, and stems. This leftover pile is called grape pomace. Usually, it's treated as trash.
This study asked a simple question: Can we turn this "trash" into a treasure for our kitchens? Specifically, the researchers wanted to make a vegan mayonnaise (a creamy sauce usually made with eggs and oil) that is healthier, uses no eggs, and recycles wine waste.
They tested three versions of mayo to see which one held together best and tasted good.
The Three Contenders
Think of the three mayo jars as a race:
- The Champion (GP0): This is the "Gold Standard." It's a regular, store-bought full-fat mayonnaise made with sunflower oil and eggs. It's the benchmark everyone else is trying to beat.
- The Runner-Up (GP1): This is the experimental vegan mayo. It swaps out some of the sunflower oil for grape seed oil and adds a tiny sprinkle (0.25%) of fermented grape skin powder.
- The Underdog (GP2): This is the same vegan recipe as GP1, but it uses more grape seed oil (10% instead of 5%).
The "Glue" Test: How Well Does It Hold Together?
Mayonnaise is essentially a "marriage" between oil and water. Usually, they hate each other and separate. To keep them together, you need a "glue" (emulsifiers).
The researchers put these mayo jars through a rheology test. Imagine this like a "stress test" for a bridge:
- The Push: They pushed the mayo to see how hard it was to get it moving (Yield Stress).
- The Flow: They watched how it flowed when pushed (Viscosity).
- The Rebound: They stopped pushing and saw if the mayo snapped back to its original shape (Thixotropy).
The Results:
- GP1 (The Winner): This version was the closest twin to the commercial champion. It held its shape almost perfectly. The grape skin powder acted like a secret ingredient that helped the grape seed oil behave like the sunflower oil.
- GP2 (The Loser): This version was too weak. It was runny and didn't hold its shape as well. The researchers found that while grape seed oil is healthy, it's slightly "thinner" (less viscous) than sunflower oil. When they used too much of it, the "glue" couldn't hold the structure together as tightly.
The Analogy: Think of the oil droplets as people in a crowded dance floor.
- Sunflower oil is like a crowd of people holding hands tightly; they move as one solid block.
- Grape seed oil is like a crowd that is a bit more slippery; they slide past each other easier.
- GP1 worked because the grape skin powder acted like a "dance instructor," helping the slippery grape seed oil crowd hold hands just as tightly as the sunflower oil crowd.
- GP2 had too many slippery dancers and not enough instructors, so the dance floor fell apart.
The Color Change: The "Rosy" Surprise
Regular mayo is white or pale yellow. But because the researchers added fermented red grape skin powder, the new vegan mayo turned a lovely pinkish-red.
- Why? The grape skins are full of natural red pigments called anthocyanins (the same stuff that makes red wine red).
- The Verdict: While the color was unique, the researchers noted that people generally preferred the traditional white look. The red color was a side effect of the healthy ingredients, not a flaw, but it did make the product look different from what people are used to.
The Safety Check: No Bacteria Allowed
Mayonnaise is acidic (thanks to vinegar and lemon juice), which usually keeps bad bacteria away. The researchers checked the jars over 28 days to see if any germs (like E. coli or Salmonella) grew.
The Result: Zero growth. The acidic environment and the natural antimicrobial properties of the grape powder kept the mayo safe, just like the regular store-bought kind.
The Taste Test: What Did People Think?
A group of people tasted the samples and rated them on flavor, texture, and how much they'd want to buy.
- The Verdict: The traditional mayo (GP0) won. People liked its familiar taste and color the most.
- The Takeaway: The vegan versions were acceptable, but the "red" color and slight texture differences made them less popular than the classic white mayo. However, the texture of GP1 was very close to the original, proving that a healthy swap is possible.
The Final Conclusion
The study found that you can successfully make a vegan, healthy mayonnaise using wine waste, but you have to be careful with the recipe.
- The Sweet Spot: Using a small amount of grape seed oil (5%) combined with fermented grape skin powder creates a mayo that is structurally almost identical to the commercial version.
- The Warning: If you use too much grape seed oil (10%), the mayo becomes too weak and runny.
- The Benefit: This process turns winemaking waste into a food product rich in fiber and antioxidants, offering a sustainable alternative to traditional mayo, even if it looks a little pink.
In short: Grape waste + a little bit of oil + the right recipe = A healthy, vegan mayo that holds together almost as well as the real thing.
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