What Is Gellan Gum? Low Acyl vs High Acyl Gellan Gum Explained

Gellan gum is one of those ingredients that has quietly become essential across a wide range of formulations — yet many buyers and formulators encounter it without a clear picture of what it actually does, or why there are two distinct types that behave so differently from each other.

If you have ever seen a plant-based milk that stays perfectly uniform on the shelf without settling, a jelly with unusual clarity and a clean snap, or a beverage that suspends fruit pulp without any visible thickener effect — there is a good chance gellan gum was involved.

This guide explains what gellan gum is, how it works, the critical difference between Low Acyl (LA) and High Acyl (HA) gellan gum, and how to identify which type is right for your application.

At Unionchem, we supply both LA and HA gellan gum as part of our hydrocolloid portfolio:Gellan Gum — Unionchem Product Page

For a full view of our ingredient range, visit:All Products

What Is Gellan Gum?

Gellan gum is a water-soluble polysaccharide produced by microbial fermentation of the bacterium Sphingomonas elodea. It is a high-molecular-weight biopolymer that, when dissolved in water and cooled, forms a gel.

What makes gellan gum particularly valuable is not just that it gels — it is how it gels, and the exceptional range of textures and functional properties it can deliver depending on the form used and the conditions of the system.

Key functional properties of gellan gum include:

• Gelling — forms stable gels at very low concentrations (typically 0.02% to 0.2%)

• Suspension — creates a weak gel network that holds particles in place without making a product feel thick

• Stabilizing — prevents phase separation, sedimentation, and syneresis

• Thermal stability — gels withstand high-temperature processing including UHT and pasteurization

• Clarity — Low Acyl gellan gum produces brilliantly clear gels

• Versatility — texture can be tuned from firm and brittle to soft and elastic depending on type and formulation

These properties make gellan gum useful in food and beverage, plant-based products, confectionery, dairy alternatives, microbiological and plant tissue culture media, and a range of specialty applications.

How Is Gellan Gum Produced?

Gellan gum is produced through controlled microbial fermentation. Sphingomonas elodea bacteria are cultivated in a fermentation medium, where they produce the polysaccharide as a metabolic product.

After fermentation, the gellan gum is recovered, purified, and dried into a powder. The key processing step that determines the final product type is whether the acyl groups on the native polymer are retained or removed:

• Native (unprocessed) fermentation produces High Acyl (HA) gellan gum, which retains its natural acyl substituents

• Deacylation — treating the polymer with alkali — removes the acyl groups to produce Low Acyl (LA) gellan gum

This single processing difference produces two products with dramatically different gelling characteristics.

Low Acyl (LA) vs High Acyl (HA) Gellan Gum: The Core Difference

The most important thing to understand about gellan gum is that LA and HA are not interchangeable. They produce fundamentally different textures and serve different functional purposes.

Low Acyl (LA) Gellan Gum

Low Acyl gellan gum has had its acyl groups removed through deacylation. Without these substituents, the polymer chains can pack together tightly during gelation, forming a firm, brittle, and brilliantly clear gel.

Key characteristics of LA gellan gum:

• Gel texture: Firm, brittle, non-elastic

• Gel appearance: Brilliantly clear and transparent

• Gelation: Triggered by cations (calcium, potassium, sodium) and cooling

• Gel strength: High — strong gels at low concentrations

• Syneresis: Can occur if not properly formulated

• Thermal stability: Gels are heat-stable once set

• Typical use concentration: 0.05% to 0.25%

LA gellan gum is typically used for:

• Clear jellies and confectionery gels

• Plant tissue culture and microbiological media (preferred over agar for clarity and consistency)

• Transparent gelling applications where visual clarity is important

• Structured food systems requiring a clean, firm bite

• Specialty pharmaceutical and nutraceutical gels

High Acyl (HA) Gellan Gum

High Acyl gellan gum retains its natural acyl groups. These substituents prevent the polymer chains from packing tightly, resulting in a soft, elastic, and opaque gel — and, critically, the ability to form a fluid gel at low concentrations.

Key characteristics of HA gellan gum:

• Gel texture: Soft, elastic, flexible

• Gel appearance: Opaque, creamy

• Gelation: Occurs on cooling, less dependent on cations than LA

• Fluid gel behavior: At low concentrations, forms a weak gel network that flows under shear but recovers at rest — ideal for suspension

• Syneresis: Minimal

• Typical use concentration: 0.02% to 0.15%

HA gellan gum is typically used for:

• Plant-based milk and dairy alternative beverages — suspends protein, calcium, and other insoluble particles without making the drink feel thick

• Pulpy juices and fruit-containing beverages — holds fruit particles in suspension

• Yogurt and fermented dairy products — improves body and reduces syneresis

• Bakery fillings and fruit preparations — provides soft, spreadable texture

• Sauces and dressings — contributes to suspension and mouthfeel

LA vs HA Gellan Gum: Full Comparison Table

Why Is Gellan Gum So Effective at Such Low Concentrations?

One of gellan gum's most commercially important characteristics is its exceptional efficiency at very low use levels.

Effective gellan gum concentrations typically range from 0.02% to 0.2% — far lower than many other hydrocolloids used for comparable functions.

This matters for several practical reasons:

• Cost-in-use — even if the per-kilogram price of gellan gum is higher than some alternatives, the very low effective dosage means the actual cost per unit of finished product can be highly competitive

• Clean label — lower inclusion rates mean less impact on ingredient declarations

• Formulation flexibility — low dosage leaves room for other functional ingredients without overloading the system

• Texture precision — small adjustments in concentration produce meaningful changes in texture, giving formulators fine control

For buyers evaluating hydrocolloid costs, it is important to compare on a cost-in-use basis rather than a per-kilogram basis alone.

Gellan Gum in Plant-Based Beverages: Why It Works

One of the fastest-growing application areas for gellan gum — particularly HA gellan gum — is plant-based milk and protein beverages.

The challenge in plant-based beverages is well known: protein particles, calcium, and other insoluble ingredients tend to settle to the bottom of the bottle or carton, creating an uneven product that requires vigorous shaking and leaves a poor impression on consumers.

Traditional thickeners can solve the sedimentation problem but create a new one: the beverage becomes too thick or viscous, losing the light, fluid texture consumers expect from a milk alternative.

HA gellan gum solves both problems simultaneously.

At very low concentrations (typically 0.02% to 0.05%), HA gellan gum forms a weak gel network — sometimes called a fluid gel — throughout the beverage. This network:

• holds protein, calcium, and other particles in suspension, preventing sedimentation

• breaks down under shear (when the bottle is shaken or the product is poured), allowing the beverage to flow freely

• recovers its network structure at rest, maintaining suspension during storage

The result is a beverage that pours and drinks like a fluid but maintains perfect particle suspension on the shelf — without any noticeable thickening effect.

This is why HA gellan gum has become a standard ingredient in oat milk, almond milk, soy milk, pea protein beverages, and other plant-based drinks produced at commercial scale.

Gellan Gum in Plant Tissue Culture and Microbiological Media

Outside of food and beverage, one of the most technically important applications for LA gellan gum is in plant tissue culture and microbiological growth media.

For decades, agar was the standard gelling agent for these applications. Gellan gum — particularly LA gellan gum — has become the preferred alternative in many laboratories and commercial tissue culture operations for several reasons:

• Clarity — LA gellan gum produces a brilliantly clear gel, making it easier to observe root development, contamination, and culture growth

• Lower effective concentration — gellan gum gels effectively at approximately half the concentration of agar, reducing material cost

• Consistency — gellan gum is a defined, consistent product; agar quality can vary between batches and sources

• Purity — high-purity gellan gum contains fewer impurities that could interfere with culture growth

• Autoclavability — gellan gum gels withstand standard autoclave sterilization

For commercial plant propagation, research laboratories, and pharmaceutical microbiology, these advantages make LA gellan gum a technically superior choice over agar in many protocols.

Gellan Gum vs Xanthan Gum: What Is the Difference?

Buyers and formulators working in food and beverage often ask how gellan gum compares to xanthan gum, since both are microbial fermentation-derived hydrocolloids used in similar application areas.

They have very different functional profiles.

In many formulations, gellan gum and xanthan gum are not direct substitutes. They are selected based on the specific functional requirement:

• If you need a firm, clear gel — LA gellan gum

• If you need suspension in a beverage without thickening — HA gellan gum

• If you need thickening, viscosity, and shear-thinning in a sauce, dressing, or drilling fluid — xanthan gum

For a complete overview of xanthan gum and its applications, see:What Is Xanthan Gum and What Is It Used For?

For the Unionchem xanthan gum product page, visit:Xanthan Gum

Gellan Gum vs Agar: Key Differences

For buyers in the tissue culture, microbiological, and food gelling markets, the comparison between gellan gum and agar is frequently relevant.

For tissue culture and microbiological applications where clarity, consistency, and purity matter, LA gellan gum is the technically superior choice in most modern protocols.

Gellan Gum vs Carrageenan: What Should You Choose?

Carrageenan is another widely used hydrocolloid in food and beverage, particularly in dairy and plant-based applications. Buyers sometimes evaluate gellan gum and carrageenan for similar applications.

In plant-based beverages specifically, HA gellan gum has increasingly become the preferred choice over carrageenan due to its efficiency at very low concentrations, its clean fluid gel mechanism, and its favorable label positioning in many markets.

How to Choose Between LA and HA Gellan Gum

The choice between LA and HA gellan gum comes down to the texture and function you need in your application.

Choose LA Gellan Gum when you need:

• A firm, brittle, clear gel

• High gel strength at low concentration

• Transparency and visual clarity in the final product

• A gelling agent for tissue culture or microbiological media

• A clean-break texture in confectionery or structured food applications

Choose HA Gellan Gum when you need:

• A soft, elastic, or fluid gel texture

• Suspension of particles in beverages without visible thickening

• Stabilization of plant-based milk, protein drinks, or pulpy juices

• A creamy, smooth texture in dairy alternatives or yogurt

• Minimal syneresis in soft gel applications

If you are unsure which type is appropriate for your formulation, working with a supplier that can provide application-specific technical guidance is the most reliable approach.

What to Check When Sourcing Gellan Gum

For procurement teams and technical buyers, sourcing gellan gum involves several important evaluation points beyond price.

Product specification

• Confirm whether you need LA or HA — these are not interchangeable

• Check viscosity, gel strength, and moisture specifications

• Confirm purity grade (food grade, tissue culture grade, etc.)

Technical documentation

• Technical Data Sheet (TDS)

• Certificate of Analysis (COA) per batch

• Safety Data Sheet (SDS)

• Food safety certifications relevant to your market (e.g., FSSC 22000, ISO 22000, Halal, Kosher)

Supplier capability

• Can the supplier consistently supply the specific type (LA or HA) you require?

• Do they understand the application requirements behind your specification?

• Can they support export documentation and global logistics?

• Is the supplier a manufacturer or a trading company?

For guidance on evaluating hydrocolloid suppliers, see:Manufacturer or Trader? How to Choose a Reliable Hydrocolloid Supplier

Unionchem Gellan Gum: Product Portfolio

Unionchem supplies both Low Acyl and High Acyl gellan gum under our UC-GG product series, designed to meet the performance requirements of food, beverage, and specialty industrial applications.

Both grades are available with full technical documentation including TDS, COA, and SDS, and are supplied with application support for formulation work.

For full product details and to request a sample, visit:Gellan Gum — Unionchem Product Page

Related Products

Buyers working with gellan gum in food, beverage, and industrial applications may also be interested in:

• Xanthan Gum — thickener, stabilizer, and suspension agent for food, beverage, and oilfield applications

• Welan Gum — high-performance biopolymer for construction, oilfield, and industrial suspension applications

• Carboxymethyl Cellulose (CMC) — versatile thickener, stabilizer, and water retention agent across food, industrial, and oilfield applications

• All Products

Conclusion

Gellan gum is a high-performance hydrocolloid that delivers exceptional gelling, suspension, and stabilization at very low use concentrations. Its two primary forms — Low Acyl and High Acyl — serve fundamentally different functions and are selected based on the texture and performance requirement of the application.

In summary:

• LA gellan gum forms firm, brittle, brilliantly clear gels — ideal for confectionery, structured food systems, and tissue culture media

• HA gellan gum forms soft, elastic, fluid gels — ideal for suspending particles in plant-based beverages, dairy alternatives, and pulpy drinks without adding visible thickness

• Both types are effective at very low concentrations, offering strong cost-in-use performance

• Gellan gum is not a direct substitute for xanthan gum, agar, or carrageenan — it has a distinct functional profile that makes it the preferred choice for specific applications

Selecting the right type and grade requires understanding your formulation requirements and working with a supplier that can provide both the product and the technical support to match.

Explore Unionchem's gellan gum solutions:Gellan Gum — Unionchem Product Page

Frequently Asked Questions (FAQ)

Q1: What is the difference between Low Acyl and High Acyl gellan gum?

Low Acyl (LA) gellan gum produces firm, brittle, and brilliantly clear gels. High Acyl (HA) gellan gum produces soft, elastic, and opaque gels, and is capable of forming a fluid gel network that is highly effective for particle suspension in beverages. They are not interchangeable — the choice depends on the texture and function required.

Q2: Why is gellan gum used in plant-based milk?

HA gellan gum forms a weak fluid gel network at very low concentrations (typically 0.02% to 0.05%). This network suspends protein, calcium, and other insoluble particles throughout the beverage, preventing sedimentation without making the drink feel thick or heavy. It is one of the most efficient suspension agents available for plant-based beverage applications.

Q3: Can gellan gum replace agar in plant tissue culture?

Yes. LA gellan gum is widely preferred over agar in plant tissue culture. It produces a clearer, more consistent gel at approximately half the concentration of agar, allowing easier observation of culture development and more reliable results. It is also a more defined and consistent product than agar, which can vary between batches.

Q4: What is a fluid gel and why does it matter?

A fluid gel is a weak gel network that holds its structure at rest but flows freely under shear (such as when a bottle is shaken or a product is poured). HA gellan gum forms fluid gels at low concentrations, which is why it is so effective for beverage suspension — it keeps particles in place during storage but allows the product to pour and drink like a normal fluid.

Q5: How does gellan gum compare to xanthan gum?

Gellan gum and xanthan gum have different functional profiles. Gellan gum is primarily a gelling and suspension agent. Xanthan gum is primarily a thickener and viscosity modifier with strong shear-thinning behavior. In most applications, they are not direct substitutes — the choice depends on whether you need gelling, suspension without thickening, or viscosity and flow control.

Q6: What concentration of gellan gum should I use?

Effective concentrations depend on the application and type. LA gellan gum is typically used at 0.05% to 0.25% for gelling applications. HA gellan gum is typically used at 0.02% to 0.15% for suspension and soft gel applications. Exact dosage should be determined through formulation testing, as system composition (particularly cation content) significantly affects gelation behavior.

Q7: Does Unionchem supply both LA and HA gellan gum?

Yes. Unionchem supplies both Low Acyl (UC-GG-LA) and High Acyl (UC-GG-HA) gellan gum with full technical documentation and application support. See: Gellan Gum — Unionchem Product Page

Ready to Source Gellan Gum?

Unionchem supplies Low Acyl and High Acyl Gellan Gum for food, beverage, plant-based, and specialty applications — with consistent quality, full documentation, and technical support for your formulation work.

Explore our products:

• Gellan Gum

• Xanthan Gum

• Welan Gum

• Carboxymethyl Cellulose (CMC)

• All Products

Contact us:sales@unionchem.com.cnPhone: +86-13953383796 | +86-533-7220272Website:www.unionchem.com.cn