Inulinase Specification Checklist for Fructose Production

Most commercial inulinase applications for fructose from inulin are evaluated in mildly acidic conditions, commonly around pH 4.5 to 5.5, with operating temperatures often in the 50 to 60 °C range. Some preparations may tolerate wider or narrower windows, so the TDS should be checked against your process constraints. Initial screening dosages may fall around 0.1 to 1.0 kg enzyme preparation per metric ton of dry inulin substrate, or an equivalent activity-unit dosage, but this must be optimized in pilot work. Higher solids can improve plant productivity but may reduce mixing efficiency and increase viscosity. Residence time is typically set by target dextrose-equivalent-style reducing sugar release, fructose concentration, and by-product limits. Buyers should also confirm whether enzyme deactivation is possible through heat treatment, pH adjustment, or downstream evaporation conditions without affecting syrup color or flavor.

Typical screening pH: 4.5–5.5, subject to enzyme TDS. • Typical screening temperature: 50–60 °C, subject to stability data. • Typical starting dosage: 0.1–1.0 kg/MT dry substrate or activity-equivalent.

A qualified inulinase supplier should provide documentation before plant introduction, not after problems appear. Request a current COA for the offered lot, a technical data sheet with activity definition and recommended conditions, and an SDS covering handling, storage, and safety controls. For food sweetener manufacturing, also request statements relevant to intended market access, such as food-processing suitability, allergen information, carrier composition, and country-of-origin details where needed. Avoid vague activity claims that do not identify substrate, assay pH, assay temperature, and unit definition. The COA should allow incoming QC to compare activity, appearance, moisture or formulation basis where applicable, microbiological limits, and lot traceability. Supplier qualification should also evaluate change-control practices, batch-to-batch consistency, lead time, packaging integrity, technical service capability, and whether the supplier can support pilot validation with realistic sample quantities.

Required: COA, TDS, SDS, activity method, storage conditions. • Useful: allergen, carrier, origin, traceability, and change-control statements. • Confirm whether samples and scale-up support are available.

Comparing inulinase quotes only by price per kilogram can be misleading because enzyme concentration, activity definition, storage stability, and dosage response vary. Cost-in-use should be calculated as enzyme cost per metric ton of dry inulin processed, per kilogram of fructose produced, or per target syrup solids unit. Include yield, conversion time, tank occupancy, energy, pH adjustment, filtration impact, product losses, and waste handling. Supplier qualification should cover commercial availability, shelf life, packaging sizes, cold-chain or ambient storage requirements, technical support, and ability to provide consistent lots. Clarify whether the formulation contains stabilizers, salts, or carriers that affect ash, color, flavor, or labeling in your market. For search terms such as inulin insulin, buyers should distinguish terminology: inulin is a fructan feedstock, while insulin is a hormone and not relevant to industrial enzyme conversion.

Calculate enzyme cost per ton of dry substrate and per kilogram of fructose. • Include yield, residence time, and downstream effects in total economics. • Qualify supply reliability before moving from pilot to production.

Inulin is a fructan carbohydrate made mainly of fructose units and is found in sources such as chicory root and agave. In an industrial fructose process, inulin fiber is treated as a feedstock rather than as a dietary supplement ingredient. Inulinase hydrolyzes the fructan bonds to produce fructose-rich syrups or, with partial hydrolysis, shorter fructooligosaccharide fractions.

Yes, the source can affect degree of polymerization, impurities, viscosity, mineral content, and pretreatment needs. Chicory root inulin and agave inulin may both be suitable for inulinase conversion, but they should not be assumed to perform identically. Pilot trials should use the actual commercial feedstock, target solids, and process water to confirm dosage, conversion rate, filtration behavior, and final carbohydrate profile.

A practical first screen often uses pH 4.5 to 5.5, temperature around 50 to 60 °C, and a dosage ladder near 0.1 to 1.0 kg enzyme preparation per metric ton of dry inulin substrate, or the supplier’s activity-equivalent recommendation. These are starting points only. The final setpoints should be based on your enzyme TDS, feedstock, residence time, target fructose yield, and downstream constraints.

Compare quotations by cost-in-use, not only price per kilogram. Normalize offers by activity method, dosage needed for target conversion, reaction time, yield, storage stability, packaging, and technical support. Ask each supplier for COA, TDS, SDS, activity definition, sample availability, and expected lead time. A lower-priced enzyme can be more expensive if it requires higher dosage or longer tank residence.

Brix and reducing sugar tests are useful for monitoring, but they do not fully define the carbohydrate profile. Use HPLC or an equivalent validated method to measure fructose, glucose, sucrose, residual inulin, and FOS distribution. Also record pH, temperature, time, solids, viscosity, color, and deactivation conditions. These data support process control, supplier comparison, and scale-up decisions.