Alginate Oligosaccharides

Alginates earn their keep by thickening things. Chop the same polymer chain down to a handful of sugar units and the opposite happens: the gel collapses, the viscosity vanishes, and what remains is a small, free-moving oligomer that dissolves instantly and goes to work biologically instead of rheologically. That is the whole idea behind alginate oligosaccharides (AOS), and it is the product line Eata Marisource has built around controlled enzymatic degradation of brown-seaweed alginate.

Buyers arrive at this chemistry from very different directions. A fertiliser blender wants a root-signalling elicitor at 100 g per tonne. A hatchery nutritionist is after a gut-health ingredient shrimp can actually absorb. A cosmetics lab is screening oligomers for anti-biofilm activity, and an academic glycobiology group needs DP3 and DP5 standards with paper-traceable purity. We supply all of the above from one production platform, with the degree of polymerisation (DP) doing most of the differentiating.

Same Backbone, Different Behaviour

Native alginate is a linear copolymer of β-D-mannuronic acid (M) and its C-5 epimer α-L-guluronic acid (G). Run an alginate lyase across it and two things change at once. The molecular weight drops from six figures into the hundreds, and a 4-deoxy-L-erythro-hex-4-enopyranosyluronate residue appears at the new non-reducing end, giving the oligomers a characteristic unsaturation that absorbs at 235 nm. Practically, this means the material you receive is fully water soluble, stays clear at working concentrations, will not gel with calcium, and contributes essentially no viscosity, which is precisely why it can be dosed into clear liquids, seed coatings and low-solid formulations that a thickening agent would wreck.

A Ladder of Fractions, Not a Single SKU

Rather than one generic 'brown powder', we cut, sort and pack alginate into defined oligomer windows. Current lines:

Why the DP Window Does the Talking

Oligomer length is not a cosmetic detail, it is the activity dial. Published work and field experience line up on three bands:

• DP 2–5: the strongest elicitor range. Root initiation, germination vigour and salicylate/jasmonate immune priming all peak here.
• DP 6–10: the balanced band. Growth promotion still holds while stress tolerance and shelf-stable formulation behaviour improve.
• Above DP 10: uptake efficiency falls away quickly, which is why we cap standard grades at DP 10 and quote molecular weight on every CoA.

Ask us which window suits your crop, species or assay, and we will match the fraction rather than selling you a one-size powder.

How the Chain Gets Cut

Everything starts with food- and industrial-grade alginate extracted from Laminaria and related brown seaweeds. From there the route is deliberately gentle: alginate lyases produced by submerged fermentation cleave the backbone in controlled-pH reactors, so no strong acid or oxidative chemistry touches the chain. That preserves the unsaturated termini associated with bioactivity and keeps the salt load predictable. Oligomers are then sorted by membrane cutoff and ion-exchange chromatography, decolourised, and dried by spray or freeze drying depending on the grade. Where a customer needs a single chain length, the same platform yields chromatography-purified DP1 through DP10 mannuronate and guluronate sodium salts.

The Numbers Behind Every Batch

A certificate of analysis for our oligosaccharide grades typically reports:

• Total oligosaccharide content and DP distribution by HPLC-ELSD or HPAEC-PAD
• Average molecular weight and molecular weight distribution
• M/G ratio by NMR or colourimetric assay, on request
• A235 absorbance for unsaturated oligomer verification
• Moisture by Karl Fischer or loss on drying, plus ash and pH (1% solution)
• Heavy metals including Pb, As and Hg, and a full microbiological panel

Batch-to-batch consistency is what formulators actually buy, so retention samples from every production run are held frozen for the full shelf life of the grade.

Where Customers Put AOS to Work

Agriculture remains the largest outlet. Blended at 100–500 g per tonne into water-soluble or foliar fertilisers, low-DP AOS improves rooting, nutrient-use efficiency and abiotic stress recovery, and it carries no residue burden. In aquaculture and animal feed, oligosaccharides are dosed as a gut-flora and immune-support additive, either top-dressed onto pellets or included in premixes.

Research and industrial uses fill out the range: glycobiology and structure-activity studies built on our single-DP standards, anti-biofilm and skin-microbiome screening in personal care, fermentation media optimisation, and biomaterials work where short alginate chains act as plasticisers or crosslinking spacers. Because the molecule is marine-derived, biodegradable and free of solvent residues, it slots cleanly into sustainability-led formulations.

Packing, Storage and Paperwork

• Powders: 1 kg aluminium foil bags, 5 kg cartons, 25 kg fibre drums; nitrogen flush on request
• Liquids: 25 L jerrycans and 200 L drums, IBC available for volume buyers
• Standards and single-DP fractions: frozen vial formats with lot-traceable purity sheets
• Standard powder stores cool and dry, sealed against moisture; frozen storage extends oligomer integrity past three years
• Every shipment carries COA, MSDS/TDS and certificate of origin; third-party testing reports can be arranged per batch

Tell Us the Fraction, We Will Build Around It

A fixed catalogue only goes so far with this chemistry. If your trial data points to a narrower DP band, a different M/G balance, a specific counter-ion, or a co-processed blend with other marine oligosaccharides, our enzymatic platform can be retargeted without changing your raw-material supplier. Send the specification, the target dose rate and the application, and we will come back with a sample, the supporting analytical package and a scale-up path from kilogram to container loads.

For Research or Industrial Raw Materials, Not For Personal Medical Use!