Spirulina added to gluten-free bread changed aroma compounds and prebiotic activity
What it found
Adding spirulina flour to gluten-free bread dough produced more organic acids and unique aroma compounds in lab tests.
The spirulina-enriched dough also fed beneficial gut bacteria better than plain dough in test-tube experiments.
What they found
Studies in people
Taste testing by consumers
Twenty people tasted the baked breads three hours after they came out of the oven. They generally preferred the plain gluten-free breads over the spirulina ones, especially rating the color and smell lower. Taste and crispiness scores were about the same for both types.
Animal and lab studies
Prebiotic activity in lab tests
In test-tube experiments, unfermented spirulina dough fed two types of beneficial gut bacteria about as well as a known prebiotic fiber from chicory. Baking reduced this effect, but spirulina bread still performed better than plain gluten-free bread, which showed no prebiotic activity at all.
Aroma compounds in bread
Lab analysis found over 250 aroma molecules across all samples. Spirulina doughs and breads contained unique compounds not found in plain versions, including thymol, borneol, and nicotinic acid. After baking, spirulina breads kept higher levels of organic acids and ketones than standard breads.
Fermentation and baking effects
Adding spirulina did not stop yeast or beneficial bacteria from growing during fermentation. Dough acidity was similar between spirulina and plain batches. Baking lowered the total amount of aroma compounds, but spirulina breads still held more than unfermented spirulina doughs.
What the authors conclude
- They conclude that spirulina flour can be used to add protein to gluten-free bakery products while improving their functional potential.
- Their analysis shows that adding spirulina and using sourdough fermentation creates specific aroma profiles and increases antimicrobial compounds in the bread.
- The authors note that the higher levels of certain fatty acids in spirulina bread might explain why consumers rated its smell and color lower.
How it was done
Gluten-free flours are often low in protein, so makers look for ways to add nutrients without ruining taste or texture. Spirulina is rich in protein and other nutrients, but its effect on the smell, taste, and gut benefits of baked goods needed study.
Researchers made gluten-free bread doughs using maize and rice flour, replacing 5.3% with spirulina flour in half the batches. They fermented the doughs for 6 to 18 hours at 31 °C using different starters, then baked them at 180 °C for 20 minutes. Twenty people tasted the finished breads, and researchers measured aroma chemicals and bacterial growth in lab tests.
What it can’t tell you
- The prebiotic activity was measured in test tubes using isolated bacteria, so it cannot show what happens in a human gut after eating the bread.
- Consumer taste tests involved only 20 people, so the preference results may not reflect how a wider group would react.
- The chemical measurements describe what is in the bread, not how much of it the body actually takes in or uses.
Who paid
- Authors work at
- Alma Mater Studiorum - University of Bologna, Italy
The paper
- Title
- Effect of formulations and fermentation processes on volatile organic compounds and prebiotic potential of gluten-free bread fortified by spirulina ( Arthrospira platensis )
- Type
- Study
- Evidence
- Studies in people · animals · lab
- Summarised from
- Full text
- Cite
- Casciano F, Nissen L, Gianotti A (2021). Effect of formulations and fermentation processes on volatile organic compounds and prebiotic potential of gluten-free bread fortified by spirulina ( Arthrospira platensis ). Food & function. doi:10.1039/d1fo01239hFree full textPubMed 34542123DOI
Summary written 30 Sep 2026. Check it against the paper before it changes what you eat. How we summarise papers · Report an error