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Organic FOS Syrup in Beverages: A Buyer’s Guide to Application Specs
FOS syrup is the economical way to add prebiotic fibre to a beverage, and the easiest way to under-deliver it. The water in the syrup, the oligosaccharide content on a dry basis, and the hydrolysis rate in an acid system all interact – and a specification that captures only one of the three will produce a product that drifts below its claim. This guide covers what to specify.
What Is FOS Syrup?
It is fructooligosaccharide delivered in solution rather than dried. Commercial syrup typically runs 70-75 Brix, so a quarter to a third of what you pump is water.
- Dry substance: 70-75% typical – a quarter of delivered weight is water
- Oligosaccharide content: 90-95% of the carbohydrate on a dry basis
- Delivered oligosaccharide: roughly 65-70% of total weight
- Viscosity: pumpable at ambient, no heated storage needed
Key Specifications
Specify dry substance and oligosaccharide content together, with the measurement method named.
- Dry substance (Brix): 70.0-75.0% with typical value stated
- FOS content: minimum 90% of carbohydrate, method stated
- Glucose + fructose + sucrose: balance, typically 5-10%
- pH: 5.0-7.0
- Colour: water-white to pale straw
- Organic certification: USDA Organic or EU Organic with transaction certificate
Ask for the saccharide profile rather than a single FOS figure. The residual mono- and disaccharide fraction contributes sweetness and browning, and it is the fraction that grows if the syrup ages.
Functional Benefits
FOS syrup pumps at ambient and blends inline without a dissolution step, which removes a mixing operation from a beverage line. It contributes mild sweetness at roughly 30-50% of sucrose intensity, so it can carry part of the sweetener load while adding fibre.
Compared with powder grades, syrup costs less per unit of oligosaccharide because you are not paying to remove water and then add it back. For high-volume beverage production that difference is decisive.
Applications in Food, Beverage & Supplements
Neutral-pH beverages are the best fit – dairy drinks, plant-based milks, and meal replacement shakes where FOS adds fibre and mild sweetness together. In high-acid drinks, FOS still works but needs the stability panel described below.
In bakery and confectionery, syrup grades contribute browning and moisture retention in liquid-based processes. In supplements, they serve sachets, syrups and liquid formats where a dry powder would not dissolve in time.
How to Formulate / Use
Calculate fibre on dry basis, then convert to delivered weight. A syrup at 72 Brix with 92% FOS on dry basis delivers roughly 66 g of FOS per litre. A formula targeting 3 g per 500 mL bottle needs about 4.5 g of syrup – and that brings 1.3 g of water with it.
For any product below pH 4.0 with a shelf life beyond nine months, run a hydrolysis panel. Measure FOS content by the named method at zero, three, six and nine months under accelerated storage. Hydrolysis shows up as a falling FOS figure before it shows up as a flavour or clarity change, and catching it early is the difference between a formula adjustment and a reformulation after launch.
Sourcing & B2B
Qualify syrup suppliers on Brix consistency as much as FOS content. A Brix drift from 72 to 68 changes delivered oligosaccharide by 5% and quietly erodes the claim. Request Brix and FOS data together across at least five recent lots, and ask for hydrolysis data at your product’s pH rather than a generic stability claim.
Organic FOS syrup starts with certified organic chicory or organic sucrose – confirm which, since the two sources carry different label stories. Require the organic certificate and the lot transaction certificate. For bulk delivery, confirm dedicated transport or a validated cleaning certificate between conventional and organic loads, and check that ambient storage in your climate does not push the syrup into a temperature range that accelerates hydrolysis.
Frequently Asked Questions
Q: Is FOS syrup stable in acidic drinks?
A:Partially. It hydrolyses over time below pH 4.0. Run an accelerated stability panel measuring FOS content rather than assuming stability.
Q: Why is my delivered fibre lower than calculated?
A:Usually a Brix assumption. Calculate on the lot-specific dry substance rather than a nominal figure.
Q: Does FOS syrup need heated storage?
A:No. At 70-75 Brix it stays pumpable at ambient. Avoid hot storage, which accelerates hydrolysis.
Q: What is the difference between FOS syrup and powder?
A:The same molecule, different water content. Syrup is cheaper per unit of oligosaccharide; powder suits dry blends.
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