Carrageenan (Iota, High-Purity)

The iota fraction of carrageenan, a sulfated galactan polysaccharide extracted from Eucheuma denticulatum (formerly Eucheuma spinosum) red seaweed. Selected and refined for high purity to deliver soft elastic gels that release water minimally and reform after shear.

Off-white to pale tan free-flowing powder. Soluble in hot water above 70 °C; gels on cooling in the presence of calcium ions. Distinct from kappa carrageenan (firm brittle gel with potassium) and lambda carrageenan (non-gelling thickener).

We supply Iota Carrageenan from manufacturers in China holding ISO, Halal, Kosher and other certifications relevant to the product and production. JECFA-compliant refined carrageenan only; no semi-refined PES material in this specification.

Common market grades include high-purity dairy-grade iota for milk desserts and yogurt-style products, water-gel-grade for fruit jellies and ready-meal sauces, blended iota-kappa grades for tunable gel firmness, and pharmaceutical USP/EP grade for tablet and oral-suspension applications.

Bulk and reduced-MOQ shipments. Batch-level COA covering viscosity, sulfate ester content, gel strength with calcium, heavy metals, and microbiology.

Carrageenan has been extracted from Irish moss (Chondrus crispus) for traditional milk-pudding preparation since at least the seventeenth century. Modern industrial production began in the 1930s and 1940s, with subsequent identification of three principal fractions, kappa, iota, and lambda, distinguished by the position and number of sulfate ester groups on the galactan backbone.

Iota carrageenan is the predominant fraction in Eucheuma denticulatum and gives a characteristic soft elastic gel that contrasts with the firm brittle gel of kappa carrageenan from Kappaphycus alvarezii. Production proceeds by alkaline extraction of dried seaweed, filtration, precipitation with alcohol or potassium chloride, washing, and drying to a refined powder. Iota selection is achieved by source-seaweed choice and downstream fractionation.

Regulated in the EU as E407 (refined carrageenan) and E407a (processed Eucheuma seaweed), classified as Generally Recognized as Safe by the U.S. FDA under 21 CFR 172.620 for refined carrageenan, and approved by JECFA without a numerical Acceptable Daily Intake limit for refined material. The JECFA evaluation distinguishes refined high-molecular-weight carrageenan from low-molecular-weight degradation products (poligeenan), which are not permitted in food applications.

Mechanism in finished products is calcium-mediated double-helix association: dissolved iota carrageenan chains, on cooling, form double helices that aggregate through calcium-ion bridges to create a three-dimensional gel network. The gel is soft, elastic, syneresis-resistant, and freeze-thaw stable, and reforms after shear (thixotropic recovery), distinguishing iota gels from the brittle non-reforming gels of kappa.

Strategic positioning: High-purity iota carrageenan is the specialty fraction selected for dairy desserts, soft sauces, and applications where syneresis control and shear recovery are required. Specification work should target sulfate ester content and viscosity at standard concentration, since these parameters determine gel firmness and matrix compatibility in finished products.

• Soft elastic gels in dairy desserts, panna cotta, and milk-based puddings
• Stabilizer in low-fat and reduced-sugar yogurt and yogurt drinks
• Thickener and texturizer in cold-fill dairy beverages and protein drinks
• Suspension stabilizer in chocolate milk and cocoa beverages
• Gelling agent in fruit jellies, gummy water-gels, and dessert preparations
• Texture modifier in vegetarian and vegan meat alternatives with low-temperature gel set
• Sauce, dressing, and ready-meal stabilizer with shear-recovery gel behavior
• Pharmaceutical and supplement tablet binder and slow-release matrix
• Personal-care thickener in toothpaste, lotions, and creams