Gellan Gum in Whole Wheat Bread: What a Recent Study Found at Different Addition Levels

🍞 Whole wheat bread has an obvious advantage: it contains more of the grain than refined white bread. But from a formulation and processing perspective, whole wheat flour can also make bread more difficult to control.

The higher level of bran and other components can affect dough structure, crumb formation, moisture distribution, and the final texture of the bread.

This raises an interesting question:

Can a small amount of gellan gum improve the structure of whole wheat bread without changing the basic characteristics of the bread too much?

A recent study published in Food Hydrocolloids investigated exactly this question.

The researchers tested gellan gum at concentrations ranging from 0 to 2.0% in whole wheat bread and evaluated the resulting products using several different analytical techniques. The study found that a relatively low level of 0.125% gellan gum produced the most balanced results.

🌾 Why Is Whole Wheat Bread More Difficult to Formulate?

Whole wheat flour is not simply refined wheat flour with more fiber added.

The presence of bran and other components can interfere with the development of the bread structure.

During dough mixing and baking, the formulation needs to create a network that can retain the gas produced during fermentation.

If that structure is not sufficiently effective, the final bread may have problems such as:

• Uneven crumb structure
• Dense areas
• Irregular pores
• Changes in firmness
• Reduced elasticity
• Less desirable mouthfeel

Hydrocolloids are therefore sometimes investigated as tools for modifying dough and bread structure.

Gellan gum is particularly interesting because it can form a structured polymer network at relatively low concentrations.

But the important question is not simply whether gellan gum works.

The more useful question is:

How much is actually needed?

🔬 What Did the Study Test?

The researchers prepared whole wheat bread formulations containing different amounts of gellan gum.

The tested concentration range was broad:

0–2.000% (w/w)

Nine formulations were examined.

Instead of evaluating the bread only by appearance or simple hardness measurements, the researchers used a multimodal approach.

The analysis included:

• Surface microscopy
• Color measurement
• Hyperspectral imaging
• Texture profile analysis
• Stress relaxation
• FTIR spectroscopy

This is important because bread quality is not controlled by a single property.

A bread can have acceptable hardness but still have an undesirable crumb structure.

Similarly, a formulation can produce a stronger structure but become too different from the original product.

The researchers therefore looked at several characteristics at the same time.

📊 The Interesting Result: 0.125%

Among the formulations tested, the 0.125% gellan gum sample showed the most balanced overall performance.

This is a particularly interesting result because 0.125% is a relatively low addition level compared with the upper concentrations investigated.

The study reported that this formulation maintained characteristics close to the control bread without gellan gum.

In texture profile analysis, the 0.125% sample showed comparable:

• Hardness
• Springiness
• Cohesiveness
• Resilience

to the control formulation.

In other words, the purpose was not to turn the bread into a highly structured gel-like product.

Instead, the low level of gellan gum helped maintain the overall bread characteristics while influencing the internal structure.

🍞 What Happened to the Crumb Structure?

One of the more interesting findings was observed under microscopy.

The bread containing 0.125% gellan gum showed a smoother crumb surface and more uniformly distributed pores compared with the control.

This matters because the internal pore structure strongly influences how bread looks and feels when eaten.

A more uniform distribution of pores can contribute to a more consistent crumb.

The result also helps explain why looking only at hardness would not be enough.

The bread did not need to become dramatically harder or softer.

Instead, the internal structure was modified while the overall textural characteristics remained close to the control.

🧪 Gellan Gum Did Not Simply Make the Bread Harder

This is an important point when interpreting the study.

When people hear "gelling agent," it is easy to assume that adding more gellan gum should simply make the product firmer.

But food applications are usually more complicated.

The researchers found that the effect of gellan gum depended strongly on concentration.

At the moderate level of 0.125%, the bread retained structural and textural characteristics close to the control.

At higher levels, the results did not continue improving indefinitely.

This is a familiar pattern with hydrocolloids:

More does not automatically mean better.

The optimum level depends on the food matrix and the property that the formulator is trying to control.

🔄 What Did Stress Relaxation Show?

The researchers also used stress relaxation analysis to examine the viscoelastic behavior of the bread.

The 0.125% formulation showed values close to the control.

The reported residual force after the test, F60, was 1.344 N, while the stress relaxation behavior also remained comparable to the control.

This indicates that the low-level gellan gum formulation preserved the overall viscoelastic character of the bread rather than creating a completely different structure.

For bread formulation, this is useful information.

Consumers do not evaluate bread based on one number such as hardness.

They bite it, compress it, chew it and feel how quickly it recovers.

That means elasticity and structural recovery can be just as important as firmness.

🔬 What Did FTIR Tell the Researchers?

The researchers also used Fourier-transform infrared spectroscopy (FTIR) to investigate molecular-level characteristics.

Interestingly, the spectrum of the 0.125% gellan gum bread showed a very strong correlation with the control.

The reported correlation coefficient was ρ = 0.99639.

Only minimal shifts were observed in the amide and carbohydrate bands.

This suggested that the addition of gellan gum at this concentration did not cause major disruption to the molecular organization of the bread system.

That is another reason why the 0.125% level stood out.

The formulation was able to influence the physical structure while remaining relatively close to the original bread system at the molecular level.

👀 What About Color and Other Visual Properties?

Bread development is not only about texture.

Color and visual appearance also matter.

The researchers therefore included colorimetric analysis and hyperspectral imaging in their evaluation.

At 0.125% gellan gum, the distribution of chromophores observed through hyperspectral imaging was comparable to the control at several wavelengths, including 477, 513, 523 and 619 nm.

This provided additional evidence that the low-level formulation remained close to the control in its overall physical characteristics.

📈 Why Did Higher Concentrations Not Keep Improving the Bread?

This is probably one of the most useful lessons from the study.

Hydrocolloids interact with the food matrix.

Their effect depends on concentration, water availability, polymer structure and interactions with other components.

Therefore, once the required level of structural modification has been reached, adding more hydrocolloid may not provide additional benefits.

In some cases, excessive hydrocolloid can actually move the product away from the desired texture.

For a bakery manufacturer, this means that optimization should normally look for a functional concentration, rather than simply testing whether a higher dosage produces a stronger effect.

🌿 Why Is This Interesting for Clean-Label Bakery Products?

The study described gellan gum as a potential clean-label additive for whole wheat bread.

The interest comes partly from the fact that consumers increasingly look for simpler ingredient lists while manufacturers still need to maintain product quality.

Whole wheat formulations can be particularly challenging because improving nutritional characteristics does not automatically guarantee the desired bread structure.

A hydrocolloid such as gellan gum provides another formulation tool.

The important point is that the study did not demonstrate that "more gellan gum makes better bread."

Instead, it showed that a carefully selected low concentration could preserve the structural and textural characteristics of whole wheat bread while improving aspects of its internal structure.

🧪 What Does 0.125% Mean in Practical Terms?

A concentration of 0.125% corresponds to:

1.25 g gellan gum per 1 kg of formulation

or:

125 g per 100 kg

This is a useful way to understand the scale of the addition.

The study tested concentrations up to 2%, but the best-balanced formulation was much lower.

That is a good reminder that gellan gum is often evaluated at relatively low levels depending on the application.

Of course, the result from one bread formulation should not automatically be treated as a universal commercial dosage.

Flour composition, hydration, gluten strength, processing conditions and other ingredients can all change the response.

⚙️ What Could Change the Result in a Real Bakery?

A laboratory bread formulation is only one system.

Commercial bread production can involve many additional variables:

Variable	Possible influence
Flour type	Gluten and water absorption
Bran content	Dough structure
Water level	Hydration and crumb texture
Mixing	Dough development
Fermentation	Gas production and cell structure
Baking temperature	Crust and crumb formation
Gellan concentration	Structural modification
Salt and other ingredients	Dough and hydrocolloid behavior
Processing scale	Mixing and heat transfer

This is why the 0.125% result is best viewed as a research reference point, not a universal recipe.

A commercial producer would still need to optimize the level using its own flour and processing conditions.

🥖 Gellan Gum and Whole Wheat Bread: What Is Actually Being Improved?

The study is interesting because it shows that gellan gum can affect several levels of bread structure at the same time.

At the macroscopic level, the bread needs acceptable hardness and elasticity.

At the microscopic level, the crumb needs an appropriate pore structure.

At the molecular level, the formulation should remain reasonably stable.

The 0.125% formulation performed well across these different measurements.

That is why the researchers described it as the most balanced concentration among the formulations tested.

🔬 Why Multimodal Testing Matters

A single test can sometimes give a misleading picture of a food product.

For example:

Hardness: tells us how much force is required to compress the bread.

Microscopy: shows the internal crumb structure.

Stress relaxation: provides information about viscoelastic behavior.

FTIR: gives information about molecular characteristics.

Hyperspectral imaging: provides information about spatial distribution of chemical/optical features.

When several methods point toward the same formulation, it becomes easier to understand why that formulation performs well.

This study is therefore useful not only because of its specific 0.125% result, but also because of the way the researchers evaluated the bread.

🌾 Could the Same Approach Be Used for Other Bakery Products?

Possibly, but the formulation would need to be tested separately.

Bread, cakes, gluten-free bakery products and other baked foods have different structural systems.

The role of gellan gum can therefore change considerably depending on:

• Gluten content
• Starch composition
• Water level
• Fat content
• Protein content
• Baking conditions
• Desired texture

For example, a formulation designed for whole wheat bread should not automatically be transferred to a cake or gluten-free bread at the same concentration.

The useful lesson is the formulation approach, rather than simply copying one number.

🌱 What This Study Tells Us About Gellan Gum

Gellan gum is sometimes introduced simply as a "gelling agent."

This bread study shows a different side of the ingredient.

At a relatively low concentration, gellan gum can influence the structure of a complex food system without necessarily producing a strongly gelled texture.

In the whole wheat bread studied here, the most balanced result occurred at 0.125%, where the bread retained characteristics close to the control while showing a more uniform crumb structure.

That makes the study particularly relevant for food formulators.

The interesting question is not:

"How strong a gel can gellan gum make?"

It is:

"What level of structure does the food actually need?"

📚 The Research Behind This Article

This article is based primarily on:

Banerjee, D., Neelapu, B. C., Sivaraman, J., Skrt, M., Jarzębski, M., Poklar Ulrih, N., Anis, A., & Pal, K.

Gellan gum as a clean-label additive to improve whole wheat bread characteristics: A multimodal characterization approach.

Food Hydrocolloids, 172, 111952 (2026).

The study is especially useful because it connects gellan gum concentration with actual bread texture, crumb microstructure and molecular characteristics rather than discussing the ingredient only from a theoretical perspective.