Dosage is the first number a formulator needs and the hardest to get from a specification sheet. This article gives you the arithmetic, the starting points, and the method for finding your own number.
The units, and why they confuse people
Gellan gum is dosed by weight percentage of the finished product, expressed as % w/w. Three ways the same quantity gets written:
| Expression | Meaning | Example |
|---|---|---|
| 0.03 % | 0.3 g per kg of product | 0.3 g in 1 litre of beverage |
| 300 ppm | 300 mg per kg | Same thing |
| 0.3 g/L | Grams per litre | Approximately the same for a dilute aqueous product |
For dilute products, % w/w and g/L are close enough to interchange because 1 litre weighs about 1 kg. For a concentrated product — a sauce, a syrup, a confectionery mass — density is not 1, and you must convert properly:
grams per litre = (% w/w ÷ 100) × density in g/mL × 1000
A 0.5 % dose in a product with a density of 1.25 g/mL is 6.25 g/L, not 5 g/L. That difference matters when you are scaling a batch.
Starting points by application
These are orientation values for low acyl gellan gum unless stated otherwise. Every one of them must be verified in your own system — ion content, pH and solids all shift the number.
| Application | Typical dosage | What it is doing |
|---|---|---|
| Clear beverage, pulp suspension | 0.015–0.03 % | Yield stress without thickness |
| Plant-based milk | 0.02–0.05 % | Protein and mineral suspension |
| Protein drink, high mineral | 0.03–0.06 % | Suspension in a difficult ionic matrix |
| Fruit juice with pulp | 0.02–0.04 % | Pulp suspension |
| Acidic RTD beverage | 0.02–0.04 % | Suspension at low pH |
| Spoonable dressing | 0.05–0.15 % | Body plus suspension |
| Ketchup, tomato sauce | 0.02–0.08 % | Syneresis control, solids suspension |
| Fruit preparation | 0.1–0.3 % | Structure and water binding |
| Firm gel, heat stable | 0.2–0.5 % | Self-supporting gel |
| Jelly dessert | 0.3–0.6 % | Firm, clean-bite gel |
| Soft elastic gel (HA) | 0.3–1.0 % | Elastic, mouth-melt texture |
| Vegan gummy | 0.5–1.0 % | Chewy structure without gelatine |
| Toothpaste | 0.2–0.8 % | Paste structure and yield stress |
| Dysphagia thickener | 0.2–0.6 % | Liquid-specific; verify per drink |
The formula for a batch
For a batch of a known mass:
gum required (kg) = batch mass (kg) × dosage (%) ÷ 100
Worked examples:
- 1,000 kg of beverage at 0.03 % → 1,000 × 0.03 ÷ 100 = 0.3 kg
- 3,000 kg of sauce at 0.05 % → 3,000 × 0.05 ÷ 100 = 1.5 kg
- 500 kg of jelly at 0.4 % → 500 × 0.4 ÷ 100 = 2.0 kg
Two practical notes:
- Weigh accurately at low doses. 0.3 kg in a 1,000 kg batch is a small quantity, and a 5 % weighing error is 15 g. For production, use a calibrated scale with adequate resolution, and consider preparing a diluted premix for very low dosages.
- Account for the premix carrier. If you dry-blend at 1:10 with sugar, the gum is 1/11 of the blend by weight. Dose the blend, not the gum.
The cost arithmetic
Gellan gum's commercial case rests on how little you need:
kg of product per kg of gum = 100 ÷ dosage (%)
| Dosage | Product per kg of gum | Interpretation |
|---|---|---|
| 0.03 % | 3,330 kg | Cost per unit is negligible |
| 0.05 % | 2,000 kg | Cost per unit is negligible |
| 0.3 % | 333 kg | Cost per unit is small |
| 1.0 % | 100 kg | Cost per unit is material |
At 0.03 %, one kilogram of gum treats more than three tonnes of product. This is why gellan gum can be among the most expensive hydrocolloids per kilogram and still the most economical per unit of finished product for suspension applications.
Why you cannot simply copy a dosage
Four variables change the number you need:
1. Ion content. More calcium or magnesium means a stronger network per unit of gum — up to a point. Recipes with a high mineral load may need less gum, or may gel prematurely and need a sequestrant instead.
2. pH. Acidic systems interfere with hydration and network formation. Below about pH 4, expect to need more gum, plus a hydration strategy that keeps the gum out of contact with acid until it is fully hydrated.
3. Total soluble solids. High-solids systems hydrate more slowly and may need a longer hold time rather than more gum. Adding more powder to a poorly hydrated system usually makes things worse, not better.
4. Shear history. In suspension applications, the structure is deliberately broken by pumping and reforms at rest. A dosage that works in a still beaker may be under-dosed in a plant where the product is pumped hard.
How to find your own dosage in one day
A staged approach that avoids wasted trials:
- Fix everything else first. Set the recipe, the process temperature and the ion level. Vary only the gum.
- Run three doses, spaced by a factor of roughly two — for example 0.02 %, 0.04 %, 0.08 %.
- Measure the target property, not appearance. For suspension, use settling time or yield stress. For gels, use firmness and elasticity. For syneresis, weigh the free liquid.
- Interpolate and confirm. The right answer is usually between two of your three points. Run a fourth batch at that level to confirm.
- Repeat at the top and bottom of your ingredient specification range — the calcium-rich and calcium-poor versions of your main ingredients.
- Re-verify at end of shelf life. The correct dose at release and the correct dose at month twelve are not always the same.
What to ask a supplier
Give them your application, your target texture or suspension requirement, your pH and your ion load, and ask for a starting dosage with reasoning. Then ask whether their recommendation changes with your process water.
For dosage recommendations and samples of gellan gum (E418) for your specific application, contact Cinogel.
Part of the E418.org gellan gum knowledge base. See also: how much gellan gum should you use, and how do you choose the right gellan gum concentration.