Marine Oligosaccharides

There is a moment in every seaweed carbohydrate project when the long chains stop being useful. A fucoidan too heavy to cross a cell membrane, an alginate too viscous to pipette, a galactan that will not dissolve below pH 5 — the chemistry is right, the size is wrong. Cutting the polymer down to an oligosaccharide changes all three at once: solubility climbs, viscosity falls away, and the fraction becomes something a membrane, a microbe or a cell line can actually engage with. That is the business we are in — we take the same seaweeds everyone else extracts and re-read them at a smaller scale.

Size, though, is only half the story. Two alginate oligosaccharide batches can both sit in the DP 2–25 window and behave nothing alike if one is mannuronic-rich and the other guluronic-rich; a fucoidan fragment keeps or loses its activity depending on how much sulfate survived the cut. So we treat oligosaccharides as structured products rather than chopped-up polymers: the depolymerisation route, the block composition and the sulfation are all specified up front, and the batch data that arrives with your order confirms each of them.

One Family of Feedstocks, Eight Oligosaccharide Lines

Every line in our oligosaccharide catalogue starts from a polysaccharide we already handle at scale, then goes through a depolymerisation step matched to that backbone. The map below shows where each line comes from and what defines it.

How the Chain Gets Cut — and Why We Prefer Enzymes

Four routes can shorten a marine polysaccharide, and they do not produce the same product. Acid hydrolysis is cheap and fast but randomly cleaves the backbone and can strip sulfate groups; oxidative and hydrothermal methods run similar risks; enzymes cleave at known linkages, at near-ambient temperature, and leave the structural features your work depends on. Where enzyme choice allows it — alginate lyases that prefer M or G blocks, for instance — we use that specificity to steer the product towards the structure you asked for.

Narrowing the Window: Purification and Fractionation

A hydrolysate is a crowd, not a product. After depolymerisation, each batch moves through membrane fractionation — ultrafiltration to remove oversize chains, nanofiltration to strip salts and concentrate — and, where the specification demands a tight band, gel filtration chromatography. Activated-carbon and ion-exchange steps deal with colour and residual monomers. What leaves us is a fraction, not a filtrate: DP windows quoted as ranges, salt content measured, and monosaccharide carryover minimised.

Proof, Not Promises: How Each Batch Is Characterised

• HPLC/SEC for molecular-weight distribution and DP profile.
• ESI-MS or MALDI-TOF for compositional confirmation of the oligomer series.
• 1D/2D NMR for linkage type, block composition and sulfation position where required.
• TLC as a rapid DP fingerprint during production.
• Sulfate content by ion chromatography on every sulfated line, every lot.
• Colour, ash, moisture, pH and microbial limits close out the release package.

Where Our Oligosaccharides Are Working

• Gut-microbiota and prebiotic research — NAOS, AOS and fucoidan fragments feeding short-chain-fatty-acid studies.
• Cosmetic and dermal R&D — mid-weight fucoidan fractions and AOS in collagen-expression and antioxidant assays.
• Agricultural science — laminarin and alginate oligosaccharides as elicitors in plant-defence models.
• Cell culture and biomaterials — low-viscosity fractions for hydrogel modification and signalling studies.
• Analytical glycoscience — DP-defined standards and substrate panels for method development.
• Fermentation and bioprocessing — defined-carbon feed trials and marine-derived carbon-source studies.

Formats, Storage and Shipping

Fractions ship freeze-dried by default — the gentlest path from solution to stable powder — with spray-dried bulk available on higher-volume lines. Research packs start at 100 mg in glass vials; production quantities come in foil-laminated pouches or 25 kg fibre drums. Hygroscopic grades get moisture-barrier liners and desiccant, and cold-chain options are there for fractions where stability data says they should stay chilled.

Cut to Order

Standard windows cover most projects; when they do not, the custom route is short. Tell us the DP or molecular-weight band you need, the block composition or M/G ratio that matters to your assay, the sulfate content to hold, and the salt form you want it delivered in — we will set the enzyme system and fractionation accordingly, run a sample for your confirmation, then scale the same recipe from gram to multi-kilogram quantities without changing the chemistry. Existing customers regularly start with a one-page specification and nothing more.

Send us your target DP window, source preference or application note, and we will reply with the closest matching fraction, its characterisation data, and a sample plan.

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