Marine Monosaccharides & Oligosaccharides

Every marine polysaccharide can be taken apart, and what comes out of that process is where a lot of serious work happens. A monosaccharide is a fixed molecule with a defined formula and a CAS number; an oligosaccharide is a short chain whose behaviour depends on how many units long it is and how those units are linked. Between the two sits most of the material our customers order: reference monomers for analytical work, and oligosaccharide fractions made to a degree of polymerisation that their own experiments can rely on.

We supply both sides of that line. On one side, crystalline monomers — fucose, rhamnose, the uronic acids, the amino sugars — in analytical and bulk grades. On the other, oligosaccharide families prepared from alginate, fucoidan, agar, carrageenan, laminarin, chitin and ulvan, offered as broad fractions or as discrete DP series where the project calls for a single chain length. Each comes with the structural evidence behind it, not just a purity figure.

Marine monosaccharides: the monomers

Marine sugars differ from the familiar plant sugars in small but decisive ways. Fucose carries a methyl group where other hexoses carry a hydroxyl, which makes it less hydrophilic and gives it a distinctive role on cell surfaces. The uronic acids — mannuronic, guluronic, glucuronic, iduronic — bring a carboxylate group, so they set charge density and metal binding in the polymer they came from. And 3,6-anhydro-L-galactose, the monomer that closes the agar chain, has no counterpart in land plants at all.

What the purity figure covers

A purity percentage means very little on its own. For a monomer used as a calibration standard, the relevant questions are which method produced the number, what the impurity is, and whether water or counter-ion is included in the mass. For a monomer used as a process input, the questions shift to flowability, residual solvent and microbial count. We state all three, and we will tell you plainly which grade fits which use rather than steering every enquiry to the most expensive one.

Marine oligosaccharides: chain length is the specification

With oligosaccharides the critical number is not purity alone but degree of polymerisation — how many sugar units sit in the chain. A preparation of DP 2–5 behaves differently from one at DP 15–25, in solubility, in viscosity, in how it interacts with a receptor, and in how readily it crosses a barrier.

How chain length is set, and how we measure it

Two routes produce short chains from a long polymer: enzymatic cleavage with a specific lyase, and chemical hydrolysis. They do not give the same material. Enzymatic cleavage by alginate lyase leaves an unsaturated bond at the newly formed chain end, and that unsaturation is widely regarded as the source of much of the biological activity in alginate oligosaccharides; harsh chemical degradation reaches a similar molecular size but tends to destroy the feature. We run the enzymatic route unless a customer specifically asks for the chemical product.

What appears on the specification

Where the material goes

The uses split fairly cleanly into two groups. Monomers and discrete oligosaccharide standards tend to go into analytical and mechanistic work, where the structure has to be known exactly. Broad oligosaccharide fractions go into formulation and process development, where cost per kilogram and consistency matter more than having a single chain length in the bottle.

Keeping a fraction reproducible

• The DP window is measured on every lot, because it is the property most likely to drift when a harvest or an enzyme batch changes.
• Retained samples are kept from each production run, so a repeat order can be matched against the material a customer already has on the bench.
• Where a project needs a single chain length rather than a window, we isolate the individual DP member and quote the purity of that member, not of the mixture.
• Sulfated fractions are reported with their sulfate percentage, since charge density shifts results as much as chain length does.
• Hygroscopic powders are packed under conditions that limit moisture uptake, and the certificate states the moisture at release rather than at manufacture.

Prepared to your specification

Custom work here usually starts with one of three requests: a chain length that is not in the catalogue, a parent polymer from a species we do not routinely run, or a quantity somewhere between a standard pack and a production batch. All three are workable, and the table shows how each is handled.

Send us the structure

Tell us the monomer or the chain length you need, the purity your method can tolerate, and the quantity the project actually requires. We will come back with what is available, what has to be prepared, and the data that will travel with the material.

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