Inositol (CAS 87-89-8) Manufacturer Guide: Process, Applications & Sourcing Tips for 99% Food-Grade Inositol

Inositol (CAS 87-89-8), also commonly called cyclohexanehexol, appears as white crystals or a white crystalline powder. It is widely used in food nutritional fortification, dietary supplements, feed additives and pharmaceutical intermediates. For buyers, the supplier comparison that truly matters is not who quotes the lowest price, but whether assay content is stable, the production process is controllable, and testing documentation is complete. This guide covers specifications, applications, production process, quality control, factory verification, and packaging, storage & transportation, and can be used directly as a checklist when issuing an inquiry.

1. Basic Specifications of Inositol: CAS No., Molecular Formula and Key Parameters

The six hydroxyl groups of inositol are symmetrically arranged on the cyclohexane skeleton. This structure gives it good water solubility, stable chemical properties, and low tendency to react with other formulation ingredients, delivering good compatibility in compounded food and feed systems. The market commonly offers two grades by assay: 98% and 99%. For food, supplement and export orders, it is recommended to lock in the 99% grade directly and require batch-specific test reports from the supplier.

Figure 1: Finished 99% Inositol — white crystalline powder, direct factory supply.

2. Main Applications of Inositol: Real-World Use Scenarios

Food & Beverages

In food applications, inositol is used mainly as a nutritional fortifier, commonly found in formula foods, solid beverages, sports drinks and certain baked goods. With good water solubility and a mild sweet taste, it rarely forms precipitates in liquid formulations and barely alters the original flavor profile, which makes it suitable for functional beverages requiring long-term stable incorporation.

Dietary Supplements

In the dietary-supplement sector, inositol is a common raw material for women’s health and metabolic-support products, usually formulated as a blend of Myo-inositol and D-chiro-inositol at a defined ratio. Such formulations place high demands on raw-material purity and batch consistency: once the blending ratio is fixed, any assay fluctuation in a batch will be reflected directly in the label values of the finished product.

Feed Additives

Aquafeed is a traditional application of inositol. It is added in fixed amounts to feeds for crustaceans such as shrimp and crabs and for certain fish species to support growth and fat metabolism, and is also used in livestock and poultry feed. Feed-grade applications have different monomial-impurity requirements compared with food-grade material, but control over heavy metals and sanitary indicators must still be maintained strictly.

Pharmaceuticals & Cosmetics

In pharmaceutical production, inositol serves as a synthetic raw material for derivatives such as inositol nicotinate. In cosmetic formulations it functions as a moisturizing and conditioning ingredient. Both directions are sensitive to appearance, color and odor of the raw material; white crystals with no off-odor are the basic requirement.

3. How Inositol Is Produced: Full Potassium Phytate Hydrolysis Workflow

The mainstream industrial route for inositol production is potassium phytate hydrolysis. The complete process consists of 22 sequential steps grouped into five phases: hydrolysis, separation, crude purification, fine purification, and finished-product handling.

1. Feeding: potassium phytate

2. Hydrolysis: 0.5–0.6 MPa, 160–190 ℃

3. Pressure filtration

4. Concentration of potassium dihydrogen phosphate

5. Decolorization and filtration

6. Crystallization & centrifugation, recovery of potassium dihydrogen phosphate

7. Activated-carbon decolorization and filtration

8. Chromatographic separation

9. Cooling crystallization

10. Crude-product concentration

11. Crude-product crystallization & centrifugation

12. Crude inositol testing

13. Fine-purification decolorization (activated carbon)

14. Fine-purification filtration

15. Fine-purification crystallization & centrifugation

16. Drying (CCP1)

17. Comminution & sieving

18. Blending

19. Iron removal

20. Metal detection (CCP2)

21. Packaging

22. Testing and warehousing

Three points in this route merit attention:

· Hydrolysis window: the combination of 0.5–0.6 MPa and 160–190 ℃ directly determines the hydrolysis rate of phytate. Insufficient pressure or temperature lowers yield, while overly harsh conditions increase by-products.

· Chromatographic separation plus two crystallizations (crude + fine purification) is the core procedure for stably reaching 99% assay, and it is the step that many small manufacturers skip or simplify.

· Recycling potassium dihydrogen phosphate from intermediate streams both spreads unit costs thinner and eases wastewater treatment pressure — a direct reflection of process maturity.

4. Quality Control for 99% Inositol: Two CCPs and Full-Chain Testing

Two explicit Critical Control Points (CCPs) can be identified in the process flow. CCP1 is set at the drying step to control finished-product moisture: excessive moisture directly causes caking and poor flowability and raises microbial risk. CCP2 is set at the metal-detection station, positioned after iron removal and before packaging, to ensure that no metallic foreign bodies remain in the finished product; this is a mandatory audit item for food and feed customers.

Beyond the critical control points, quality assurance covers four stages: raw-material incoming inspection, in-process sampling, finished-product testing, and sample retention. Routine finished-product tests include assay (HPLC), moisture, ignition residue, heavy metals and microbial indicators, with a batch-wise CoA issued for every lot. For buyers, a traceable CoA is far more useful than a vague claim of “stable quality” — it ties batch number, test items and release conclusions together.

5. How to Verify a Reliable Source Factory: Three Checkable Points

· Traceable address: a legitimate factory generally has both an office address and a production address, each corresponding to a real legal entity. A “supplier” offering only an email address and mobile number is most likely a trading middleman.

· Self-controlled testing: whether a supplier can provide batch-specific CoAs and explain at which process step the critical control points are set is a direct measure of how well they master the process.

· Complete export qualifications: export orders involve customs declaration, documentation and destination-market compliance; suppliers lacking full qualifications can stall the delivery schedule at the booking stage.

Take Natural Field as an example. Founded in 2005, its office is located at No. 57 Keji 3rd Road, High-tech Zone, Xi’an, and its manufacturing plant sits at Building 13, Caotang Sci-Tech Industrial Base, Xi’an High-tech Zone. Inositol is a regular item in its nutrition raw-material portfolio; samples and batch-level test documentation are available upon request.

6. Packaging, Storage & Transportation

Inositol is conventionally packed in 25 kg net-weight packages with a food-grade PE inner liner; outer cartons or fiber drums are optional according to customer requirements. The product should be stored in a cool, dry, dark warehouse under sealed conditions, kept separate from odorous materials; during transit it must be protected from moisture, rain and packaging damage.

For export orders, package markings, pallet requirements and shipping marks should be specified clearly in the contract, and destination-port quarantine rules for wooden packaging should be confirmed in advance to avoid extra charges after arrival. Warehouses should keep temperature and humidity records and pest-control measures, with stock issued on a First-In-First-Out basis by batch for later traceability.

7. FAQ for Inositol Sourcing

What is the difference between food-grade and feed-grade inositol?

The core difference lies in impurity control and sanitary indicators rather than the active ingredient itself. Food-grade imposes stricter limits on heavy metals, microbes and appearance, with more test items and a slightly higher price; feed-grade focuses more on hygiene indicators and cost. Before requesting a specific grade and test reports, confirm the end-product application and destination-country regulations first.

How is the 99% assay measured?

Main-component content is routinely determined by High-Performance Liquid Chromatography (HPLC), evaluated together with moisture, ignition residue and other indices for a comprehensive judgment. When requesting samples, buyers can ask the supplier for the corresponding batch chromatograms and CoA to verify that test methods and acceptance criteria are consistent.

How are MOQ and lead time determined?

The standard 25 kg package is the basic unit for minimum ordering; lead time for bulk orders follows current production scheduling. Inositol is a conventional commodity, and stable suppliers usually hold stock. Custom packaging or special specifications require an additional production cycle, subject to formal contract confirmation.

Can I request samples first?

Yes. The standard practice is to provide a small sample for lab trials and formulation validation, accompanied by the CoA of the corresponding batch. Flowability, solubility and color should be confirmed at the sample stage to avoid process-compatibility issues only being discovered after bulk delivery.

Which documents are required for export shipments?

Common paperwork includes the CoA, MSDS, non-wooden-packaging declaration or fumigation certificate, plus compliance documents required by the destination country. The exact list depends on product use and importing-country regulations; all items should be confirmed with the supplier before placing the order to prevent customs-clearance delays caused by incomplete documentation.