Fructooligosaccharides (FOS)

Fructooligosaccharides Powder (CAS 308066-66-2) is a short-chain fructan with ≥95.0% FOS content on a dried basis and a defined GF2 / GF3 / GF4 profile. It is produced by enzymatic transfructosylation of food-grade sucrose, supplied as a freely soluble white to off-white powder, and used as a bulk raw material in the prebiotic fibre ingredient category, for dietary supplement manufacture, functional food and beverage formulation, fibre fortification and sugar reduction. Huilin supplies Fructooligosaccharides Powder in bulk and wholesale quantities, in 25 kg fibre drums with double PE inner liners.

Huilin, based in Xi'an, China, supplies FOS Powder to dietary supplement brands, functional food and beverage manufacturers, nutraceutical contract manufacturers, private-label producers, and ingredient distributors - buyers whose procurement or QA team has to qualify the material against a written specification, and whose label arithmetic depends on the assay basis and the residual-sugar limit. This page documents identity, specification limits, test methods, documents and supply arrangements so that review can be completed without a round of clarifying emails.

Two things separate a comparable FOS quotation from a non-comparable one. First, the production route: FOS made by enzymatic transfructosylation of sucrose is a GF2 / GF3 / GF4 mixture in which each oligomer carries a terminal glucose unit, whereas material sold loosely as "oligofructose" is usually produced by hydrolysis of chicory inulin and carries longer and partly glucose-free chains. The two behave differently in solubility, sweetness and blending. Second, the assay basis and residual sugars: a FOS content figure is only comparable when the dry basis and the moisture limit are stated, and when the glucose / fructose / sucrose residue is declared - because that residue is what remains labelled as sugar in your finished product.

The data above is for reference only. Please request the latest Certificate of Analysis (COA) for batch-specific data. Final specifications can be confirmed according to application, target market and purchasing requirements.

Grade is set by the specification and the contaminant package, not by the chemical identity; results and methods are stated on the batch COA.

• European Union - fibre status. Under the EU definition of "fibre" - carbohydrate polymers with three or more monomeric units which are neither digested nor absorbed in the human small intestine - the FOS oligomers meet the polymer threshold, so the FOS fraction is counted as fibre in the Nutrition Declaration, while the residual glucose, fructose and sucrose declared in the specification are counted as sugars. Confirm the declaration basis with your labelling team before the Nutrition Declaration is fixed (EU definition checked 23 September 2026).
• United States - fibre status. FDA's list of isolated or synthetic non-digestible carbohydrates that meet its dietary fibre definition includes "inulin and inulin-type fructans". FOS is an inulin-type fructan (β(2→1) linked), so it falls within that entry and can be counted on that basis in the Dietary Fibre line of a US label. A listing defines a declaration route; it is not a safety approval, and the route should be confirmed with your labelling team (FDA list checked 23 September 2026).
• Additive numbers: supplied as a food ingredient and dietary fibre raw material, not as a listed food additive - no E number or INS number appears in our documentation.
• Other markets: food and supplement ingredient rules differ between markets and change over time; confirm the applicable rule and the permitted use in your destination market before the formulation is fixed.

Reference information carrying the check dates shown; the regulatory determination for your market rests with you.

Why Choose Huilin for Fructooligosaccharides Powder Supply

 

1. Assay basis and oligomer window fixed in writing before the order - FOS content is quoted on a dried basis with the moisture limit stated, and the GF2 / GF3 / GF4 window agreed, so a quotation can be compared line by line against an alternative instead of by the headline assay figure alone.
2. The COA reports the composition, not only the assay - FOS content, the individual oligomer fractions and the glucose / fructose / sucrose residue are reported per lot, which is the part your label arithmetic depends on.
3. Powder properties agreed against your process - D50 and bulk density are fixed against your filling, tableting or blending line rather than left to the batch, because those two figures decide how the powder runs.
4. Route declared, not implied - this is the sucrose transfructosylation product, GF2 / GF3 / GF4 with a terminal glucose unit on each oligomer. We do not substitute chicory-hydrolysed oligofructose for it; where your formulation was developed against the other route, the specification is re-confirmed before the order is placed.
5. Food safety certification and export handling - the supply line operates under FSSC 22000 and ISO 22000 food safety management certification; certificates are issued with the quotation on request, the documentation set is issued before dispatch, and FOB, CFR, CIF and EXW terms are available.

How FOS Powder Is Produced and Characterised

1. Enzymatic transfructosylation. A β-fructofuranosidase transfers fructose units from food-grade sucrose onto sucrose and onto the growing chain, producing the GF2 (1-kestose), GF3 (nystose) and GF4 (fructosylnystose) oligomers and leaving a terminal glucose unit on each.
2. Purification. The reaction liquor is filtered and decolourised on activated carbon, demineralised on ion exchange, concentrated and spray-dried. This stage removes the bulk of the residual glucose, fructose and sucrose and is what sets the heavy-metal and colour profile.
3. What the specification actually controls. Three figures decide whether two FOS lots are interchangeable: FOS content on a dried basis, the GF2 / GF3 / GF4 distribution, and the residual-sugar limit. Two lots can both read ≥95.0% and still differ in oligomer distribution, so the assay figure alone is not enough to compare them.
4. Route identity. The terminal glucose unit on each oligomer is what distinguishes the sucrose-route product from chains produced by hydrolysis of chicory inulin, which include glucose-free Fm-type oligomers and can extend to a higher degree of polymerisation.
5. What the assay does not cover. Moisture, particle size and bulk density are set by the drying and sieving stages, not by the reaction. They are specified separately because they determine how the powder behaves on a filling or blending line.

FOS, chicory inulin and oligofructose are all β(2→1) fructans, which is why quotations for one are often compared against another. They are not functionally interchangeable: chain length sets solubility, sweetness and how much viscosity the material contributes.

• Choose FOS Powder when the formulation needs the fully soluble short-chain fructan - for beverage, stick-pack and capsule formats where a gelling or viscosity contribution is not wanted.
• Choose Chicory Inulin Powder when the formulation wants a longer-chain fructan, or when a texture or gelling function is part of the design - see our Chicory Inulin Powder page.
• Where a specification names oligofructose, confirm which route it was written against before substitution: the hydrolysate route and the transfructosylation route differ on the residual-sugar figure and on whether glucose-free Fm-type chains are present.

• Fully soluble at working solids. FOS dissolves freely in water, so it can be dosed into beverage concentrates and syrups without the gel or viscosity that longer-chain fructans build at higher solids.
• Mild sweetness, so less masking. At ≈30-60% of sucrose sweetness, part of the sugar load can be replaced without a masking or high-intensity sweetener system carrying the whole job.
• A defined oligomer window. The GF2 / GF3 / GF4 distribution is specified as a range, so a reformulated batch repeats the one before it rather than drifting within "≥95%".
• Low residual sugars at the 95% grade. Glucose, fructose and sucrose are limited to ≤5.0%, which keeps the sugar line of the finished label arithmetic predictable.
• Powder properties that match the line. D50 and bulk density are agreed against your filling or blending process, so flow and fill weight do not become a variable you have to chase.

• Dietary supplement manufacture. Supplied as a bulk raw material for capsule, tablet, stick-pack and powder-blend production, at the 95% grade or against a blend specification agreed with your formulator.
• Functional food and beverage. Used in dairy, bakery, confectionery and beverage systems where a soluble short-chain fructan is specified and a fully dissolved, mildly sweet contribution is wanted.
• Fibre fortification and sugar reduction. Used where a fibre declaration is required on the label, or where part of the sugar load is being replaced; the residual-sugar limit and the declaration basis are fixed in the agreed specification.
• Oligosaccharide blends. Reviewed as part of a blend with other oligosaccharides or with a carrier, against a blend specification that lists the target ratio and the limiting specification for each component.

Final application performance depends on the formulation, processing conditions and target specification. Buyers are responsible for confirming that the intended use complies with the regulations of the destination market.

Huilin supplies Fructooligosaccharides Powder in bulk and wholesale quantities, in 25 kg fibre drums with double PE inner liner, from Xi'an, China. Send your target specification - FOS content and basis, the required GF2 / GF3 / GF4 window, residual-sugar limit, particle size and pack weight - and we will confirm availability, the specification sheet, the COA arrangement, shipping terms (FOB, CFR, CIF or EXW) and the lead time for your requirement.

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For inquiries, quotations, or sample requests, please contact: sales@huilinbio-tech.com

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