In recent years, seaweed fertilizer, which is safe, efficient, organic, and environmentally friendly, has been deeply loved by users. Seaweed is a type of lower aquatic spore plant, rich in seaweed polysaccharide. Seaweed polysaccharides can be divided into four categories according to their sources: fucoidan, red algae polysaccharide, green algae polysaccharide and cyanobacteria polysaccharide.
Seaweed polysaccharides have large molecular weight, low solubility, and low bioavailability. Therefore, their utilization efficiency in medicine and materials is also low, and their applications are greatly limited.
Seaweed oligosaccharides
Seaweed oligosaccharide is the degradation product of seaweed polysaccharide, a linear or branched chain compound with a polymerization degree of 2 to 10. Compared with seaweed polysaccharides, seaweed oligosaccharides have high solubility and low molecular weight, and have a variety of biological activities, such as protecting cell structure, antioxidant, growth promotion, inducing plant stress resistance, product preservation, etc., and are widely used in agriculture, medicine, food, Chemical industry and other fields have unique application advantages. Commonly used preparation methods for seaweed oligosaccharides include physical preparation, chemical preparation and enzymatic preparation. There are many types of seaweed oligosaccharides, among which the main ones are fucose oligosaccharide (FOS), agar oligosaccharide (AGOS), carrageenan oligosaccharide (COS), fucoidan oligosaccharide (AOS), etc.
Fuco-oligosaccharide (FOS)
Fucoidan, also known as fucoidan sulfate, is mainly derived from algae such as kelp and Fucus algae, as well as marine animals such as sea cucumbers and sea urchins. The oligosaccharide product obtained after fucoidan is degraded is called fucose oligosaccharide. Fucose oligosaccharide has a variety of biological activities and is becoming a new favorite in the development of a new generation of natural functional health foods, drugs and cosmetics.
Agar oligosaccharides (AGOS)
Agar is a type of linear polysaccharide extracted from the cell walls of red algae such as Gracilaria and Gelidium. The molecular weight of agar oligosaccharides is relatively small and has the advantage of being easily degraded and absorbed. Studies have shown that agar oligosaccharides can regulate the immune function of cells by promoting the apoptosis of human venous endothelial cells, inhibiting angiogenesis, inducing the expression of cytokines, and also have antioxidant, anti-inflammatory, and promotion of plant root growth. biological activity.
Carrageenan oligosaccharide (COS)
Carrageenan is a general name for a type of sulfated linear polysaccharide extracted from the cell walls of red algae plants (Gracilaria, Gelidium, Carrageensis, etc.). Carrageenan oligosaccharide has large molecular weight, high viscosity, and complex spatial structure. It has antiviral activity and can significantly inhibit the proliferation of influenza virus (H1N1).
Fucoidan oligosaccharide (AOS)
Fucoidan oligosaccharide (AOS), also called alginic oligosaccharide, is a degradation product of algin. It has the characteristics of good solubility, small molecular weight, strong stability, easy absorption by the body and high safety.
The preparation of AOS by biological enzymatic method is to prepare AOS of different low molecular weight fragments through the specific cleavage of algin lyase. This method has the advantages of mild reaction conditions, high catalytic efficiency, controllable degree of substrate polymerization, and no pollution. Compared with other methods, AOS prepared by enzymatic methods can completely retain biological activity.
Fucoidan oligosaccharides have a variety of biological activities, such as anti-tumor, anti-inflammatory, immunomodulatory and hypolipidemic effects, and have strong application prospects in the fields of medicine, health products, cosmetics, animal feed and plant regulators.
Efficacy in agriculture
(1) Activate the immune system of SA (salicylic acid) and JA (jasmonic acid), which can resist bacteria and viruses and reduce the use of pesticides.
(2) Inducing plants to synthesize ABA (abscisic acid) and JA (jasmonic acid), enhancing plant stress resistance, coloring and sweetening, leading to early maturity and early market.
(3) Inducing plants to synthesize IAA (auxin), resulting in rapid rooting, germination, and rapid growth.
(4) Natural preservatives and preservatives can extend the shelf life of fruits.