Xylo-Oligosaccharides (XOS)
Short xylose-based oligosaccharides for soluble fibre-containing nutrition formulations, with composition defined by chain distribution and purification.
Ingredient overview
XOS is produced by controlled breakdown of xylan, a major hemicellulose component in plant cell walls. Food ingredient production can use xylan-containing raw materials such as cereal processing fractions, followed by hydrolysis and purification.
The resulting preparation contains short chains of xylose with a distribution of molecular sizes. Processing determines how much free xylose, other carbohydrates and non-target material remain. XOS is therefore a family of oligosaccharide mixtures rather than one chemically uniform compound.
Functional characteristics
| Characteristic | Technical profile |
|---|---|
| Solubility | The oligosaccharide fraction dissolves into the water phase. |
| Viscosity | Short chains contribute less thickening than long-chain xylan polymers. |
| Composition | XOS concentration and residual carbohydrates are separate properties. |
| Sensory profile | Purification affects colour, flavour and sweetness. |
| Powder behaviour | Carriers and particle structure, where present, influence flow and blending. |
Applications
| Application | Ingredient role | Contribution to the product |
|---|---|---|
| Nutrition powders | Oligosaccharide inclusion | Distribution within a multi-ingredient dry blend. |
| Beverage formulations | Soluble carbohydrate fraction | Limited particulate or gel-like texture. |
| Cultured foods | Inclusion in the soluble solids | A defined oligosaccharide component. |
| Bars and soft foods | Addition through the solids or binder phase | Fibre-containing composition without a structural gum network. |
Formulation behaviour
XOS dissolves in the water available to the formulation. In a dry blend, the composition of the complete powder determines handling: a concentrated oligosaccharide powder and a carrier-standardised preparation can have different particle and moisture behaviour.
The residual sugar profile matters separately from the XOS fraction. Free xylose and other reducing carbohydrates influence sweetness and reactions with proteins during heating or storage. Hydrolysis and purification also determine the chain-length distribution, distinguishing the finished ingredient from the original xylan-rich plant material.
Material forms
Concentrated powders, standardised powder preparations and liquid forms represent different physical and compositional formats. The proportion of XOS, the distribution of chain lengths and the identity of any carriers describe separate features. Plant source identifies the raw material, while purification defines how much of that source matrix remains.
Comparison with related ingredients
AXOS retains arabinose-substituted xylose chains and is related but not identical to XOS. FOS uses fructose-based chains, while GOS contains galactose-based structures. Resistant dextrin contains glucose-based resistant carbohydrates with a different molecular distribution.