| HS Code | |
| Name | Carrageenan |
| E Number | E407 |
| Cas Number | 9000-07-1 |
| Chemical Type | Sulfated linear polysaccharide |
| Source Material | Red seaweeds such as Chondrus crispus, Eucheuma, Kappaphycus, and Gigartina |
| Appearance | White to yellowish or tan powder |
| Solubility | Soluble in hot water; dispersible and swellable in cold water |
| Primary Function | Thickener, gelling agent, stabilizer, suspending agent, and emulsifier |
| Gel Type | Thermoreversible; kappa forms firm gels with potassium, iota forms soft elastic gels with calcium, lambda is non-gelling |
| Common Applications | Dairy products, plant-based beverages, ice cream, jellies, processed meats, confectionery, toothpaste, cosmetics, and pharmaceuticals |
| Typical Use Level | 0.01% to 1.0% by weight |
| Regulatory Status | Permitted food additive in the EU as E407; permitted in the USA under 21 CFR 172.620 |
| Caloric Value | Negligible; indigestible dietary fiber |
| Taste | Bland and tasteless |
| Odor | Odorless |
| Charge | Anionic |
| Molecular Weight | High molecular weight, typically variable |
| Ph Stability | Stable over a broad pH range but may hydrolyze at low pH and high temperature |
| Storage | Cool, dry, sealed container |
As an accredited Carrageenan factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Carrageenan is packaged in 25 kg multi-walled paper bags with inner polyethylene liners, then palletized and shrink-wrapped. |
| Container Loading (20′ FCL) | Food-grade Carrageenan loaded in a 20-foot FCL container, palletized in 25 kg bags, securely stacked and moisture-protected for export. |
| Shipping | Carrageenan is non-hazardous and not classified as dangerous goods for transport. Ship in sealed, moisture-resistant bags or fiber drums, usually 25 kg. Store cool and dry. No UN number, hazard class, or special labels required. Handle to prevent dust and moisture exposure. International shipments follow general cargo rules. |
| Storage | Store carrageenan in a cool, dry, well-ventilated area at ambient temperature, away from direct sunlight, heat, moisture, and strong oxidizers. Keep containers tightly closed when not in use to prevent caking, dust, and microbial contamination. Avoid generating dust; use appropriate PPE. Maintain clean, clearly labeled containers, separate from incompatible materials. Carrageenan is stable under these recommended conditions. |
| Shelf Life | Carrageenan typically has a shelf life of about two years when stored cool, dry, sealed, and protected from moisture and light. |
In aseptic UHT chocolate milk lines, kappa-carrageenan is introduced at 0.014–0.025% by finished weight, usually dry-blended with sucrose or cocoa powder at a 1:5 to 1:10 ratio before addition to raw milk at 40–50 °C. The mechanism is electrostatic complexation between sulfate ester groups on the polymer and κ-casein, which creates a weak protein–polysaccharide network that suspends cocoa particles in the 10–25 µm mean particle size range without increasing high-shear viscosity above 15–30 cP at 20 °C. Hydration proceeds in a plate or tubular pasteurizer at 75–80 °C for 5–8 minutes, followed by two-stage homogenization at 150/50 bar. The UHT step at 137–142 °C for 4–6 seconds is not the primary degradation risk at neutral pH; the greater risk is acid hydrolysis when pH drops below 6.4 during shelf life in lactose-hydrolysed or cocoa-alkalised systems. Finished-product additive status is covered under FDA 21 CFR 172.620 and EU Regulation (EC) No 1333/2008, Annex II, E407. Sedimentation is monitored at 45 °C for 30 days using backscattered light scanning; hard-pack sediment indicates that the kappa-only network is too rigid and requires replacement with a kappa-lambda blend at 0.010–0.015% kappa and 0.005–0.010% lambda. Added potassium citrate above 0.05% in low-fat formulations can over-strengthen the gel fraction and generate visible flecks after cooling.
In whole-muscle poultry injection brines, kappa-carrageenan is used at finished-product levels of 0.10–0.30%; the brine concentration is back-calculated from injection and retention, commonly 15–25% of green weight, and typically falls in the 0.50–1.50% range after retained brine is considered. The brine also contains sodium chloride at 1.8–2.2% and sodium tripolyphosphate at 0.35–0.45%. High sodium activity is the main process conflict: kappa gel strength is optimized by potassium ions, not sodium ions, and sodium-dominated brines can delay or weaken the gel set during vacuum tumbling at 0.08–0.09 MPa vacuum, 12 rpm, 30–45 minutes, 2–4 °C. To offset this, potassium chloride is included at 0.20–0.40% in the brine, but potassium chloride above 0.50% produces bitterness in the cooked product. Carrageenan is dry-blended with the phosphate fraction before hydration to avoid localized gel lumps in the high-shear mixing vessel. Injection needles of 2.0–3.0 mm internal diameter at 2.5–3.5 bar injection pressure are standard, and needle blockage occurs when brine viscosity exceeds 120 cP. Thermal processing to a core temperature of 72 °C fixes the gel network. Yield data from plant batches commonly show 1.5–3.0 percentage points higher cook yield compared with phosphate-only controls, but published data for all brine combinations is limited. Regulatory coverage is under USDA FSIS Directive 7120.1 and FDA 21 CFR 172.620.
Toothpaste batches containing iota-carrageenan at 0.8–1.2% by finished weight require pre-dispersion in a non-aqueous humectant phase before water addition. In a vacuum mixer with planetary or anchor blades running at 20–40 rpm, iota-carrageenan is wetted into sorbitol syrup or glycerin at a 1:3 to 1:4 ratio, and the aqueous phase is introduced at 50–60 °C under a vacuum of -0.08 MPa. Hydration is continued for 15–25 minutes before abrasive cleaning agents such as dicalcium phosphate dihydrate or hydrated silica are added. Iota is preferred over kappa because calcium ions released at the abrasive surface produce an elastic, low-syneresis gel network that maintains ribbon stand-up in the tube. Sodium lauryl sulfate at 2.0–2.5% is not added directly to hydrated carrageenan; localized surfactant-rich aggregates can form and reduce gloss. The final pH is held at 7.0–9.5. Below pH 5.5, autohydrolysis of the carrageenan glycosidic bonds accelerates during 40 °C accelerated aging, producing viscosity loss that is measurable within 7 days. The filled-tube viscosity window is 25,000–45,000 cP at 25 °C on a Brookfield RVT viscometer at 10 rpm. Compliance is checked against ISO 11609:2017 and the USP-NF carrageenan monograph for microbiological limits and heavy metals.
Transparent air freshener gel systems are formulated with kappa-carrageenan at 1.0–2.0%, potassium chloride at 0.2–0.6%, a non-ionic emulsifier such as PEG-40 hydrogenated castor oil at 1.0–2.0%, and fragrance oil at 4.0–8.0%. The aqueous phase is heated to 80–85 °C in a jacketed kettle; carrageenan is dispersed at 1,500–2,500 rpm and held at temperature for 10–15 minutes. Fragrance is added after cooling to 55–60 °C, and the mass is filled into containers at 45–50 °C. The gel sets during static cooling to 20–25 °C over 60–120 minutes. Kappa gels without a co-gellant slump and exhibit syneresis within 24–48 hours; locust bean gum at 0.30–0.50% reduces syneresis and toughens the gel without clouding. Aldehyde-rich fragrance oils reduce gel strength more than ester-rich oils, so each fragrance oil is screened by measuring break force on a texture analyzer after 24 hours at 25 °C. Published data for specific fragrance evaporation rates in carrageenan matrices is limited; headspace gas chromatography after 24 hours is used as a batch-to-batch quality control comparator. Filling below 45 °C can create stringing, while filling above 55 °C can destabilize the fragrance emulsion.
| Grade | Primary ionic trigger | Gel texture and syneresis | Typical use level | Process boundary |
|---|---|---|---|---|
| Kappa | Potassium ion | Rigid, brittle, syneresis-prone | 0.015–0.60% | pH below 6.0 accelerates hydrolysis; extended shear above 3,000 rpm reduces molecular weight |
| Iota | Calcium ion | Elastic, low syneresis, freeze–thaw stable | 0.20–1.20% | pH below 5.5 causes viscosity loss; sodium-rich systems weaken gel strength |
| Lambda | None | Non-gelling, cold-water-soluble thickener | 0.05–0.30% | Provides no gel network; only suspension and mouthfeel control |
Canned pet food gravy with kappa-carrageenan at 0.20–0.30%, locust bean gum at 0.15–0.20%, and modified tapioca starch at 1.5–2.0% is formulated for retort-stable suspension of meat chunks. The dry carrageenan is pre-blended with starch to prevent fish-eye lumps, then dispersed into the meat slurry at 40–50 °C and heated to 80 °C before filling into double-seam cans. Retort processing at 121 °C for an F₀ of 3–6 minutes can shift water-binding among starch, protein, and carrageenan; post-retort syneresis appears when carrageenan is overdosed above 0.35%, when gravy pH drops below 4.5, or when water hardness exceeds 200 ppm calcium carbonate equivalents. In a rotary filler, preheated gravy is held at 75–80 °C; cooling in the can must not proceed so rapidly that the gel sets before full hydration, which creates a grainy texture. Batch-to-batch variance is controlled by measuring viscosity at 80 °C on a Bostwick consistometer, targeting 6–10 cm in 30 seconds. Regulatory coverage for the ingredient is under FDA 21 CFR 172.620 and AAFCO Official Publication ingredient definitions. Published data for specific retort time–temperature integration on carrageenan depolymerization in multi-protein gravy is limited.
Kappa-carrageenan at 2.0–4.0% is dissolved in deionized water at 70–80 °C and degassed under vacuum before cooling to 50–55 °C. The enzyme or microbial cell suspension is mixed with the cooled solution at a 1:1 volume ratio, and the mixture is extruded through a 0.5–1.0 mm nozzle into cold 0.2 M potassium chloride at 4–10 °C. Curing continues for 30–60 minutes, producing beads with diameters of 2–4 mm. The ionotropic gelation step is selective for potassium; sodium chloride at the same molarity produces weak beads, and phosphate buffer above 100 mM causes swelling and leakage. Beads are washed with 10 mM potassium phosphate buffer at pH 7.0. In packed-column operation for lactose hydrolysis, pressure drop across the bed is controlled by bead diameter and column diameter-to-bead ratio; bead rupture occurs when superficial velocity exceeds the matrix compressive yield point. Published data for long-term continuous operation of carrageenan-embedded lactase in beverage streams is limited, and each enzyme–buffer combination requires bead compressive testing on a texture analyzer before scale-up. The matrix is not suitable for enzymes requiring high sodium chloride or divalent metal chelators because both conditions destabilize the carrageenan network.
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Carrageenan is a high-molecular-weight sulfated galactan extracted from Chondrus crispus, Eucheuma cottonii, and Eucheuma spinosum by hot alkali processing. The product is assigned E407 under Commission Regulation (EU) No 231/2012 and is cleared for direct food use under 21 CFR 172.620. Commercial lots typically carry weight-average molecular weight from 200,000 Da to 800,000 Da; refined food-grade powders are controlled to ≤12% loss on drying, ≤2% acid-insoluble matter, and total sulfate ester content from 15% to 40% by dry weight. The three primary industrial fractions—kappa, iota, and lambda—differ in 3,6-anhydrogalactose content, sulfate ester position, and cation responsiveness. Kappa forms stiff, thermally reversible gels with potassium ions; iota forms soft, elastic gels with calcium ions; lambda is non-gelling and builds viscosity in cold and hot systems. Product models commonly available include refined kappa, semi-refined kappa, refined iota, and lambda; each model is further sold by gel strength, viscosity, mesh size, and syneresis control. Standard powder grades are typically milled to 95% through 100 mesh (150 μm), while agglomerated grades pass 60 mesh (250 μm) and retain on 200 mesh (75 μm) to control dusting and wetting.
Kappa, iota, and lambda fractions are separated by sulfate ester position and the presence of 3,6-anhydrogalactose residues. This molecular difference determines cation selectivity, gel texture, and process tolerance. Kappa is standardized for potassium-sensitive gelation, producing rigid, brittle gels with high syneresis unless combined with locust bean gum or other synergistic hydrocolloids. Iota is calcium-sensitive and forms cohesive, elastic gels with limited syneresis and freeze-thaw stability. Lambda has no 3,6-anhydrogalactose bridging capacity and functions as a cold-soluble thickener with high sulfate content. On a scraped-surface heat exchanger, kappa solutions below 0.25% remain low viscosity until potassium chloride is introduced; addition of 0.2% KCl at 70 °C can raise apparent viscosity by an order of magnitude as helical junction zones form. Semi-refined kappa contains residual cellulosic matter that can shift acid-insoluble content from 2% toward 8–12%, producing more turbid finished matrices than refined grades.
| Model/Fraction | Sulfate ester range | 3,6-Anhydrogalactose content | Cation selectivity | Gel character | Typical dosage |
|---|---|---|---|---|---|
| Refined kappa | 22–30% | 25–35% | K+ | Brittle, thermally reversible, syneresing | 0.02–1.5% |
| Refined iota | 28–35% | 25–30% | Ca2+ | Elastic, cohesive, freeze-thaw stable | 0.5–1.2% |
| Refined lambda | 32–39% | <5% | None | Non-gelling, high cold viscosity | 0.1–0.8% |
| Semi-refined kappa | 20–28% | 22–30% | K+ | Brittle, higher acid-insoluble fraction | 0.4–1.0% |
In pasteurized dairy stabilization, kappa carrageenan is used at 0.015–0.03% in chocolate milk and flavored milk to suspend cocoa and insoluble mineral particles. The stabilizing mechanism involves formation of a weak electrostatic gel network with casein micelles after pasteurization at 135–140 °C for 2–4 s. Without carrageenan, accelerated shelf-life storage at 4 °C can produce visible cocoa sediment within 24 h. Batch-to-batch variance in semi-refined kappa acid-insoluble matter can shift apparent viscosity by ±15% in neutral dairy systems, requiring adjustment of metering screw speed on the powder injection line. Homogenization at 150–200 bar before final pasteurization improves dispersion and reduces the risk of localized over-gelation in the balance tank. Particle size distribution of the dry powder is measured by laser diffraction to maintain D50 below 75 μm for standard grades and between 150 μm and 250 μm for agglomerated grades, which disperse more readily at low shear.
In dessert gels, water gels, and pourable dressings exposed to freeze-thaw cycling, iota carrageenan is selected because calcium-bridged junction zones produce small, ordered pore structures that resist water expulsion. Typical formulation ranges are 0.5–1.2% iota carrageenan with 0.2–0.4% calcium chloride dihydrate. Finished gels are often tested by centrifugal syneresis at 1500 × g for 10 min; formulation targets for iota gels frequently specify syneresis below 5% after three cycles of -20 °C freezing and 25 °C thaw. Kappa gels under the same thermal cycling conditions can release above 15% water by weight, a limitation that directs formulators toward iota or kappa-locust bean gum combinations. In dairy toppings, iota contributes mouthfeel and a uniform gel structure without the brittle fracture observed in potassium-induced kappa networks. Processing on plate heat exchangers requires hold times of 5 min at 75 °C to fully hydrate iota before cooling below its setting temperature of 35–45 °C in the presence of calcium.
In brine injection for formed and whole-muscle poultry, kappa carrageenan is added at 0.5–1.0% of finished product weight. Multi-needle injectors with 3 mm needle diameters and 2–3 bar injection pressure distribute the brine, followed by vacuum tumbling at 0.8 bar vacuum and 6–8 rpm for 30–45 min. Carrageenan interacts with myofibrillar protein exudate and soluble salt-extracted protein to bind free water. Thermal processing to a core temperature of 72 °C triggers hot-set gelation that improves sliceability and reduces purge during refrigerated storage. The limitation of kappa in high-salt brines is that sodium chloride competes for available water and can reduce gel strength unless the carrageenan is pre-hydrated at 70–80 °C before addition to the cold brine. Published data for this specific configuration in smokehouse and continuous oven lines remains limited; therefore, process validation is typically performed by measuring cook loss, purge, and texture profile analysis with a 50 mm diameter probe.
Lambda carrageenan produces the highest cold viscosity among the three primary types. At 1% solids in distilled water at 25 °C, typical Brookfield RVT spindle 2 at 20 rpm viscosity ranges from 200 mPa·s to 800 mPa·s for standard lambda lots, whereas refined kappa remains below 100 mPa·s unless potassium ions are added. Hydration of semi-refined kappa requires 70–80 °C for 10 min under high-shear dispersion; below 70 °C, hydration is incomplete and visible gel particles can survive downstream filling. Particle size distribution controls hydration kinetics: D50 below 75 μm reduces lumping but increases dust and operator exposure; agglomerated grades with D50 of 150–250 μm disperse more readily at low shear. An inline rotor-stator mixer operated at 3000 rpm is commonly used for dispersion, followed by a plate heat exchanger holding at 75 °C for 5 min. In aseptic beverage lines, lambda at 0.1–0.3% provides suspension of insoluble fibers without thermal gelation, but high calcium concentrations above 200 mg/L can reduce lambda solubility and should be evaluated by pilot-scale loss-on-sieve testing.
USP/NF carrageenan is used as a suspending agent, demulcent, and tablet binder in pharmaceutical and oral-hygiene formulations. In oral suspensions, lambda carrageenan at 0.2–0.5% provides yield stress and prevents sedimentation of active pharmaceutical ingredients with particle size D90 < 100 μm. Viscosity is controlled by method <911> of the current USP/NF, and microbial enumeration follows USP <61> with specified-organism testing per USP <62>. For toothpaste systems, refined iota carrageenan at 0.5–1.0% with 10–20% dicalcium phosphate dihydrate provides dentifrice stand-up and clean rinsing. Kappa carrageenan in pharmaceutical gel matrices can create brittle fracture when potassium chloride is present above 0.2%; therefore, iota or carrageenan-locust bean gum blends are preferred for elastic gel vehicles. The raw material is dispensed through loss-in-weight feeders with ±0.5% feed accuracy because exceeding the target by 0.1% can shift viscosity outside the finished product release range.
Food-grade carrageenan is tested against the Food Chemicals Codex monograph for carrageenan: total ash 15–40%, loss on drying ≤12%, acid-insoluble matter ≤2%, arsenic ≤3 mg/kg, and lead ≤5 mg/kg. Under Commission Regulation (EU) No 231/2012, E407 purity criteria include sulfate 15–40%, loss on drying ≤12%, and acid-insoluble matter ≤2%. At pH below 3.5, hot processing above 80 °C progressively hydrolyzes kappa and iota, cleaving 3,6-anhydrogalactose units and lowering gel strength; acidified fruit preparations are therefore buffered with sodium citrate before blending. Carrageenan should not be dry blended with strong oxidizing agents, and residual potassium chloride above 0.5% can over-strengthen kappa gels, creating excessive syneresis and brittle texture. Incompatibilities differ from those of agar, gelatin, high-methoxyl pectin, and xanthan gum, which are summarized in the comparative table below.
| Hydrocolloid | Gel formation | Melting/setting range | Ion requirement | Typical dosage | Major operational limitation |
|---|---|---|---|---|---|
| Kappa carrageenan | Brittle, thermally reversible | Set 30–50 °C; melt 50–70 °C | K+ | 0.02–1.5% | Syneresis; acid hydrolysis below pH 3.5 |
| Iota carrageenan | Elastic, cohesive, thermally reversible | Set 35–45 °C; melt 50–60 °C | Ca2+ | 0.5–1.2% | Slower hydration than kappa; calcium source required |
| Agar | Brittle, strong, thermally reversible | Set 32–43 °C; melt 85–95 °C | None | 0.5–2.0% | High cost; higher melt temperature alters texture |
| Gelatin | Elastic, thermally reversible | Set 15–25 °C; melt 25–40 °C | None | 1–10% | Animal origin; heat and acid instability |
| High-methoxyl pectin | Spreadable, sugar-acid dependent | Set and melt depend on soluble solids and pH | Ca2+ in low-ester types | 0.5–2.0% | Requires high sugar or low pH for gelation |
| Xanthan gum | Non-gelling thickener | Not applicable | None | 0.05–0.5% | Does not form self-supporting gels; limited texture control |
