Author: Arella Sun Publish Time: 2026-05-08 Origin: Unionchem
Gellan gum is one of those ingredients that has quietly become essential across a wide range of formulations—from the jelly in your fruit preserves to the matrix of some of your medications. It's been around since the 1970s, but its adoption has accelerated in recent years as formulators discover its unique combination of properties.
If you've been considering gellan gum for a food or pharmaceutical application and want to understand how it actually works, what grades are available, and where it performs best—this guide is for you.
Gellan gum is an extracellular polysaccharide produced through fermentation of the bacterium Sphingomonas elodea (formerly Pseudomonas elodea). It's a linear tetrasaccharide polymer with a repeating unit of glucose, glucuronic acid, glucose, and rhamnose.
The fermentation process yields a high-purity biopolymer with consistent performance—similar to xanthan gum, its functional properties are microbiologically controlled rather than subject to agricultural variability.
Gellan gum was first commercialized in the 1980s and gained initial traction as a bacterial gelling agent in place of agar in microbiological culture media. Its food and pharmaceutical applications developed later, and today it's one of the most versatile hydrocolloids available.
This is the first and most important distinction in any gellan gum discussion.
Low acyl (LA) gellan gum is produced by removing acyl groups during processing, leaving primarily the glucuronic acid backbone. This produces:
Strong, brittle gels: Clear gels with a tendency to fracture cleanly
High gel strength: Useful for applications requiring firm texture
Thermal irreversibility: Once set, the gel does not melt upon reheating
Low gelation temperature: Typically sets between 20-40°C depending on concentration and ion content
Low acyl gellan gum is the preferred choice for:
Table spreads and fruit preparations
Confectionery (gummies, jellies)
Bakery glazes and coatings
Pharmaceutical gel matrices
High acyl (HA) gellan gum retains the acyl substituents on the glucose units. This produces:
Soft, elastic gels: More flexible, deformation-tolerant textures
Thermal reversibility: Gels can melt upon heating and re-form upon cooling
Higher gelation temperature: Typically sets between 50-70°C
Better clarity: Produces clearer gels than low acyl in many systems
High acyl gellan gum is preferred for:
Soft candies and starch-based confections
Dairy and dairy-analogue gels
Personal care products
Applications where a softer texture is desired
Many commercial gellan gum products are available as blends of high and low acyl types, allowing formulators to dial in specific texture profiles:
Higher LA content: Firmer, more brittle gels
Higher HA content: Softer, more elastic gels
Balanced blends: Intermediate textures
When sourcing gellan gum, specify whether you need high acyl, low acyl, or a particular blend ratio.
Gellan gum gels through a cation-assisted mechanism. Divalent cations (particularly calcium and magnesium) and monovalent cations (sodium, potassium) facilitate gel formation by bridging between the glucuronic acid units on adjacent polymer chains.
The critical practical point: available cations determine gelation behavior. In deionized water with no added salts, gellan gum may not gel at all or may require very high concentrations. Adding calcium, sodium, or other cations triggers gelation.
Typical gelation behavior:
With calcium: Rapid gelation, stronger gels
With sodium/potassium: Slower gelation, softer gels
Without added cations: May form weak or no gel; depends on product grade
This cation dependency gives formulators a lever to control gelation kinetics and final texture.
High acyl gellan gum gels are thermoreversible—they melt upon heating and re-form upon cooling. Low acyl gellan gum gels are generally not thermoreversible once set; they maintain their structure even upon reheating.
This distinction is important when choosing between grades:
Need a gel that melts in the mouth? High acyl.
Need a gel that maintains shape under heat (like a pie filling that doesn't dissolve when the pie is warm)? Low acyl.
Gellan gum produces exceptionally clear gels, often clearer than agar, gelatin, or starch-based systems. This makes it valuable for:
Fruit preparations where visual clarity is desired
Confectionery where transparency is part of the product identity
Pharmaceutical preparations where visual inspection of the matrix is needed
Any application where haze or cloudiness is undesirable
Gellan gum interacts with other hydrocolloids in ways that can be either synergistic or antagonistic:
With xanthan gum: Can produce mixed gels with altered texture and stability
With locust bean gum: Some synergy in certain applications
With starch: Gellan gum can help stabilize starch-based systems
With gelatin: Not typically synergistic; gelatin generally produces softer gels than gellan at equivalent usage
Gellan gum is widely used in fruit preparations for:
Jam and preserves: Provides gel structure without masking fruit flavor
Fruit fillings: Holds fruit pieces in suspension, maintains shape under thermal processing
Bakery glazes: Sets at low temperature, produces glossy, clear coatings
The ability to formulate with reduced sugar (compared to traditional pectin-based spreads) is valued by manufacturers responding to consumer demand for lower-sugar products.
In confectionery applications, gellan gum:
Provides the gel matrix in starch-molded or depositor-molded confectionery
Offers clean flavor release without the masking effects of some other gel systems
Allows for firm, bite-through textures
Typical usage levels in confectionery: 0.5%–2.0%.
Gellan gum works well in dairy applications because its gelation is calcium-assisted—and dairy products already contain calcium. This makes it useful for:
Yogurt and fermented dairy: Provides texture modification and serum control
Desserts: Pudding, mousse, and ambient-temperature desserts
Plant-based alternatives: Almond, oat, and coconut milk desserts where calcium fortification is common
In plant-based dairy alternatives, gellan gum can provide gel structures that partially mimic dairy textures.
Low-concentration gellan gum (typically 0.01%–0.05%) can be used as:
Suspending agent for fruit particles, pulp, or botanical extracts
Clarity enhancement in filtered beverages
Mouthfeel modification in certain product categories
Gellan gum films are transparent, flexible, and provide moderate oxygen barrier properties. Research continues into edible coating applications for fresh produce and food packaging.
Gellan gum is used in pharmaceutical oral suspensions as a suspending vehicle:
Provides stable suspension of active pharmaceutical ingredients (APIs)
Acceptable flavor profile with minimal masking
Compatible with a wide range of APIs
Can be used in both reconstitutable powders and ready-to-use suspensions
In solid dosage forms, gellan gum functions as:
Binder: Provides cohesion in granulation and tablet compression
Disintegrant aid: Swells to facilitate tablet breakup
Film former: In controlled-release formulations
The specific grade (pharmaceutical grade with documentation to USP/NF standards) is required for pharmaceutical applications.
Gellan gum's film-forming properties and clarity make it suitable for:
Topical gel formulations
Mucoadhesive preparations
Transdermal patch matrices
High-purity gellan gum is used in some ophthalmic preparations as a viscosity modifier and lubricating agent. Pharmaceutical grade specifications (USP Grade) are essential for these applications.
When evaluating gellan gum for food or pharmaceutical use, key specifications include:
Parameter | Typical Range | Notes |
Gel strength | 50-500 g/cm² (varies by grade) | Higher for LA grades |
pH (1% solution) | 5.5-7.5 | Slight variation by grade |
Loss on drying | ≤ 15% | Shelf life indicator |
Lead | ≤ 2 mg/kg | Heavy metals control |
Arsenic | ≤ 2 mg/kg | Heavy metals control |
Total heavy metals | ≤ 20 mg/kg | Regulatory compliance |
Mesh size | 80-200 mesh | Application-dependent |
For pharmaceutical applications, additional parameters including microbial limits, endotoxin testing, and residual solvents may be required.
The most common formulation mistake with gellan gum is forgetting about cations. If your formulation isn't gelling:
Check your water: Deionized or distilled water may lack sufficient cations
Add a cation source: Calcium chloride, calcium lactate, or sodium citrate are common choices
Check pH: Extremely high or low pH can affect gelation
Review concentration: Minimum concentration thresholds must be met
As with other hydrocolloids, proper dispersion prevents clumping:
Pre-mix with dry ingredients (like sugar or salt) before adding to water
Use high-shear mixing during addition
Add to hot water for faster hydration (if your process allows heating)
High ionic strength (from added salts or mineral content) affects gellan gum performance. If your formulation includes significant salt or mineral content:
Test across your intended concentration range
Consider adjusting cation source type and level
Be aware that some minerals may compete for gelation sites
United States: FDA approved as food additive (21 CFR 172.665), no quantity restrictions for most categories
European Union: Approved as food additive E418 under Regulation (EC) No 1333/2008
General: Recognized as safe by major regulatory bodies worldwide; Halal and Kosher certifications available for relevant markets
Pharmaceutical grade gellan gum must comply with applicable pharmacopeial standards (USP/NF, EP, JP depending on target market).
When evaluating gellan gum suppliers, we recommend:
Clarify grade type: High acyl, low acyl, or specific blend ratio
Request sample quantities: Test in your actual formulation before committing
Review technical documentation: Full COA with gel strength, mesh, and purity data
Check certifications: Halal, Kosher, and quality management system certification (ISO)
Evaluate supply consistency: Batch-to-batch viscosity and gel strength consistency
Our gellan gum product page provides detailed specifications for our food grade product, with pharmaceutical and technical grades available upon request.
Gellan gum's unique combination of gel clarity, texture versatility, thermal behavior options, and clean flavor profile makes it a valuable tool for both food and pharmaceutical formulators. The high acyl versus low acyl distinction is the key starting point for any application—the choice between them determines whether you get elastic, soft gels or firm, brittle ones.
For food manufacturers exploring alternatives to traditional gelling agents (agar, gelatin, pectin, starch), gellan gum is worth serious evaluation. For pharmaceutical applications requiring consistent performance and regulatory compliance, pharmaceutical grade gellan gum offers a well-characterized option.
Our technical team at Unionchem can help you identify the right gellan gum grade for your specific application and provide samples for formulation trials. Contact us to discuss your requirements.
Unionchem supplies gellan gum, xanthan gum, and a complete range of hydrocolloid products to food manufacturers, pharmaceutical companies, and industrial formulators worldwide. We maintain ISO, Halal, and Kosher certifications on our food grade products.
