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Alginate Oligosaccharide (AOS)

What's Alginate Oligosaccharides

Alginate Oligosaccharide is the oligomer of alginate, which have strong solubility, easy absorption, and safe and non-toxic compounds. Studies have shown that it has antioxidant activity, antibacterial activity, promote plant growth, etc. It is a natural plant nutrition regulator and an ideal fertilizer additive, and has broad application prospects in agricultural production.

Dora Agri is the exportor & supplier of alginate oligosaccharides in china. Technicist filtered a specific alginate lyase with high extraction efficiency, mild reaction conditions and easy to control the degradation process. The prepared alginate oligosaccharides were safe and stable ( molecular weight and polymerization degree ), and had higher purity and activity.

Biodegradation of Alginate Oligosaccharides

Dora Agri utilizes specific algin lyase to hydrolyze alginate. Alginate lyase can degrade alginate into biologically active alginate oligosaccharides through β-elimination mechanism.

In practical application, alginate oligosaccharides are usually used as fertilizer synergist, which have super compatibility and can be compounded with traditional fertilizers. Such as Compound Fertilizers, Urea, DAP, Granular Potash, Foliar fertilizers. Adding alginate oligosaccharide to NPK can significantly improve fertilizer efficiency(20%-30%).

Alginate Oligosaccharide Mechanism of Synergistic Effect on NPK Fertilizer

Fertilizer type

Adding Dosage Per 100KGS


Compound fertilizer


Salt and alkali resistance, promote photosynthesis, promote growth



Promote the absorption of nitrogen, promote leaf growth

Diammonium phosphate


Promote the absorption of nitrogen and phosphorus, promote the growth of seeds, roots and stems

Granular potash fertilizer


Promote the absorption of potassium, promote root growth, cold resistance

Foliar fertilizer


Resist stress, promote early flowering, early maturity

Root fertilizer


Improve soil condition, basis for high yield

Water soluble fertilizer


Improve plant vigor, color&flavor, early mature, yield increasing, stress resisance, defend diseases

Potassium dihydrogen phosphate


Improve utilize of phosphorus&potassium, stress resistance, improve fruits’ quality

Calcium ammonium nitrate


Promote root growth, increase fruits’ hardness, resist lodging

Calcium magnesium nitrate


Improve utilize of calcium & magnesium, promote photosynthesis, increase protein&sugar in fruits

Functions for Plants

1. Increase Crop Growth

Alginate Oligosaccharide can induce the production of callus, significantly enhance the content of hormones (indoleacetic acid, etc.) in cells, stimulate the expression of auxin-related genes by promoting the content of hormones, lipase, amylase and protease, and promote seed germination and seedlings grow and take root.

2.Stimulate Plant Resistance Ability

The application of alginate oligosaccharide can induce and increase the secretion of plant growth hormones such as abscisic acid in plants. The research results show that alginate oligosaccharide can induce the accumulation of abscisic acid in plants, reaching 5-7 times the normal level, and has a significant anti-stress effect.

Through Dora’s tests, After applying AOS, the contents of free proline, total soluble sugar and resistin were increased, the activities of CAT, SOD, POD and PAL were increased, and the drought resistance of tomato seedlings was improved.

3.Promote Crop Nutrient Absorption

The structure of agricultural-grade alginate oligosaccharide contains carboxyl and hydroxyl groups, which can combine with ammonium ions (NH4+) in nitrogen fertilizers to form complexes, thereby inhibiting the conversion of ammonium nitrogen (NH4+) to nitrate nitrogen (NO3-), reducing nitrogen loss and reducing nitrogen loss. Provide nutrients to plants for a long time.

At the same time, low dose of alginate oligosaccharide can also promote the absorption of N, P, Ca, Mg, Mn, B, Zn and other elements by plant roots.

Dora Agri Field Trial

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