How to Use Trehalose in Bread: Ratios, Yeast, Sourdough and Freshness

TREHA® trehalose can be a particularly useful ingredient in bread, but the way it is used differs from cakes and confectionery.

In an ordinary cake, we might begin by replacing part of the sucrose with TREHA®. In bread, it is usually better to think in baker’s percentages and add TREHA® relative to the weight of the flour.

For a standard wheat loaf, a good practical starting point is:

TREHA® at approximately 4% of flour weight

So, for a recipe using 500g flour, begin with approximately:

20g TREHA®

Importantly, you should normally retain the ordinary fermentable sugar already specified in the recipe rather than replacing it with TREHA®.

Why use Trehalose in bread?

TREHA® can provide several useful effects in bread and enriched doughs, including:

• helping the crumb remain softer during storage
• reducing the dry, firm character associated with staling
• helping retain moisture
• supporting frozen-dough performance
• allowing wheat, butter, egg and other flavours to remain prominent
• producing a paler bake where this is desirable

Manufacturer guidance recommends 2–5% TREHA® relative to flour weight for ordinary white bread, with higher amounts for some enriched or specialist breads. 

Independent bread research supports a very similar range.

How much Trehalose should I add to bread?

A useful starting guide is:

These are starting points rather than universal rules.

Nagase's own technical guidance ranges from 2–5% for ordinary white bread through to 5–10% for sweet breads and rice-flour breads, depending on the desired effect.

A simple 500g flour example

If your existing loaf contains:

• 500g bread flour
• 325g water
• 10g salt
• 7g yeast
• 15g sugar

a sensible first TREHA® trial would be:

• 500g bread flour
• 325g water
• 10g salt
• 7g yeast
• 15g sugar
• 20g TREHA®

In other words, add TREHA® at 4% baker's percentage while leaving the existing sugar unchanged.

Then compare the loaf with your normal recipe for:

• proofing time
• loaf volume
• crust colour
• crumb softness
• moisture
• flavour
• texture after two or three days

This is much more informative than automatically replacing 20–30% of the recipe's sugar.

Why 4% is a particularly useful starting point

An independent study of white pan bread tested trehalose at 0%, 2%, 4% and 6% of flour weight, while retaining 6% sucrose in every formulation.

The bread containing 4% trehalose produced the highest loaf and specific volume, the lowest crumb hardness through seven days of storage and the best overall sensory score.

The 6% formulation retained more moisture and produced the lightest crumb, but 4% performed best overall. 

This makes 4% of flour weight an unusually well-supported starting point for an ordinary wheat loaf.

Does Trehalose help bread stay softer?

This is one of the better-supported reasons for using TREHA® in bread.

Bread staling is complex, but two important processes are:

water redistribution and loss, and
changes in starch structure after baking.

Research into trehalose-containing wheat bread found that TREHA® reduced the rate of firming, restricted water movement during storage and increased water-holding capacity. 

This broadly agrees with Nagase's practical description of TREHA® helping suppress the dry, hard texture that develops as bread ages. 

So rather than simply saying that trehalose “preserves bread”, the more accurate description is:

TREHA® can help bread retain a softer, less dry crumb during storage.

Should Trehalose replace the sugar in bread?

Usually, no.

This is an important difference between bread and many cakes.

Ordinary sucrose, glucose and similar carbohydrates can provide readily fermentable material for baker's yeast. TREHA® is not readily fermented by conventional baker's yeast in the same way.

Nagase specifically demonstrates this distinction and recommends TREHA® as an addition to bread formulations rather than assuming it can simply replace the normal fermentable sugar. 

So if an ordinary bread recipe already contains a small amount of sugar:

keep it initially and add the TREHA®.

You can experiment with the complete formulation later if required.

Does Trehalose affect fermentation?

It can.

Adding TREHA® changes the composition of the dough, and higher amounts can affect mixing and fermentation behaviour.

For that reason, do not assume that a recipe containing TREHA® will always follow exactly the same proofing schedule as the original.

Use the dough itself as your guide.

Look for appropriate:

• expansion
• dough strength
• gas retention
• final proof

rather than relying solely on the clock.

For a first experiment at around 4% TREHA®, large changes may not be necessary, but fermentation should still be observed rather than assumed.

Trehalose in brioche and enriched bread

TREHA® is particularly interesting in enriched bread because these products contain ingredients such as:

• butter
• eggs
• milk
• substantial quantities of sugar

Nagase recommends approximately 5–10% of flour weight for sweet breads, depending on the formulation. 

A useful starting point for brioche is approximately:

5% TREHA® relative to flour

For 500g flour:

25g TREHA®

The existing sugar should initially remain in the recipe.

TREHA® can help enriched bread retain softness while its relatively low sweetness allows flavours such as butter, egg and dairy to remain prominent.

Trehalose in wholemeal bread

Wholemeal and high-fibre breads tend to behave differently from white bread because bran and other grain components alter water absorption and dough structure.

Nagase gives a broad 3–10% range for wholemeal applications.

For home or small-scale professional experimentation, however, there is little reason to begin at the top of that range.

I would start at:

4–5% of flour weight

and adjust from there.

This means:

500g wholemeal flour → approximately 20–25g TREHA®

Trehalose in croissants

Croissants combine fermentation with laminated pastry, giving TREHA® several potential roles.

Nagase's guidance suggests approximately 3–10% relative to flour weight, depending on the formulation.

A useful first trial is again:

approximately 5%

TREHA® is particularly interesting for croissants intended to be frozen, as manufacturer testing has investigated its ability to help protect dough performance through frozen storage.

Because butter, lamination, yeast activity and gluten integrity all influence the final result, TREHA® should be regarded as one part of the formulation rather than a complete solution to frozen-dough deterioration.

TREHA® and frozen bread dough

Freezing bread dough is more demanding than freezing a fully baked loaf.

Ice formation and frozen storage can affect:

• yeast viability
• gluten structure
• gas retention
• subsequent fermentation
• final loaf volume

Trehalose is well known for cryoprotective properties in biological systems, and its use in frozen dough has been studied for precisely this reason.

However, protecting the yeast does not automatically guarantee a larger finished loaf. Frozen-dough performance also depends on maintaining the physical dough structure.

The useful takeaway is therefore:

TREHA® can support frozen-dough stability, but good formulation, freezing and thawing practice remain essential.

Does Trehalose make bread paler?

It can.

Increasing TREHA® can produce a lighter-coloured crumb and crust.

The white-pan-bread study found the 6% TREHA® loaf had the lightest crumb, while Nagase specifically identifies pale bread as a specialist application for higher TREHA® levels. 

This can be useful if you deliberately want:

• soft white sandwich bread
• pale rolls
• bread with limited browning

But it may be less desirable for a rustic loaf where a dark, well-developed crust is part of the appeal.

This is another reason not to assume that more TREHA® is always better.

What about sourdough?

Sourdough deserves separate treatment because it contains a much more diverse microbial community than dough made only with commercial baker's yeast.

A sourdough starter typically contains combinations of:

• wild yeasts
• lactic-acid bacteria
• other microorganisms

Some sourdough bacteria are capable of metabolising trehalose, so it is too simplistic to say that “sourdough cannot ferment TREHA®”.

The effect will depend partly on the microbial community present in the starter.

At present, there is not enough direct evidence to recommend a special universal TREHA® percentage specifically for freshly baked sourdough bread.

For someone who wants to experiment with TREHA® in an ordinary wheat sourdough, I would therefore begin conservatively with the same region used successfully in other wheat breads:

around 3–4% of flour weight

and treat that as an experimental starting point rather than an established sourdough optimum.

Trehalose and sourdough starter preservation

There is much stronger evidence for a different sourdough application: preserving starter cultures.

Research into freeze-dried sourdough tested trehalose at 10% and 15%, with the 15% treatment providing the strongest protection of microorganisms, particularly lactic-acid bacteria. 

This does not mean that 15% TREHA® should be added to ordinary sourdough bread.

The study was testing trehalose as a cryoprotectant during freeze-drying of the starter culture, which is a completely different application.

That distinction is important.

A practical starting guide

If you are experimenting at home or in a professional kitchen:

Standard wheat loaf

TREHA®: 4% of flour weight

500g flour → 20g TREHA®

Keep the normal sugar.

Brioche or enriched bread

TREHA®: around 5%

500g flour → 25g TREHA®

Keep the normal sugar initially.

Wholemeal bread

Start around 4–5%

Croissants

Start around 5%

Sourdough

Experiment cautiously around 3–4%

There is not yet enough evidence to call this an established sourdough optimum.

What should I look for when testing TREHA®?

Bread formulations are highly interactive, so run comparative batches where possible.

Assess the bread when fresh and again after storage.

Look at:

Day 0

• dough handling
• proof time
• oven spring
• loaf volume
• crust colour
• crumb structure
• flavour

Day 2–3

• crumb softness
• perceived dryness
• flavour
• chewiness

Day 5+

• firming
• moisture
• overall eating quality

This will tell you much more about the appropriate TREHA® level for your particular flour and process than simply maximising the percentage.

The key rule: add Trehalose according to the flour

The simplest distinction to remember is:

Cakes: TREHA® is often considered as a percentage of the sugar being replaced.

Bread: TREHA® is usually better considered as a percentage of the flour.

For an ordinary wheat loaf:

start around 4% TREHA® relative to flour weight.

That is supported both by manufacturer guidance and independent bread research. 

From there, adjust according to the bread you are making and the effect you want.

Buy TREHA® for bread making

Trehalose UK supplies genuine Japanese TREHA® manufactured by Nagase Viita Co., Ltd., formerly Hayashibara.

TREHA® Trehalose Powder 1kg
Ideal for home baking and recipe development.

TREHA® Trehalose Powder 2.5kg
For frequent bakers and professional kitchens.

TREHA® Bulk Trehalose Powder 20kg
For bakeries, food development and commercial production.

For broader guidance on cakes, biscuits, pastry and meringues, see How to Use Trehalose in Baking.

For an explanation of how TREHA® differs from conventional sugar, see Trehalose vs Sugar: What's the Difference?