壳寡糖又叫壳聚寡糖、低聚壳聚糖，是将壳聚糖经特殊的生物酶技术（也有使用

Chitosan is also called oligochitosan and oligochitosan. It is a kind of polymerization degree obtained by degrading chitosan through special biological enzyme technology (there are also reports using chemical degradation and microwave degradation technology). The intermediate oligosaccharide product has a molecular weight of ≤3200Da, which is a low molecular weight product with good water solubility, large function and high biological activity. It has a high solubility that chitosan does not have, is completely soluble in water, and is easily absorbed and utilized by organisms. Its effect is 14 times that of chitosan.

Shell oligosaccharides, also known as shell polysaccharides, oligosaccharides, are a polymerization between 2 and 20 oligosaccharides degraded by special bioenzyme technology (also reported using chemical degradation, microwave degradation technology), molecular weight ≤3200Da, is a water-soluble, functionally large, high bioactive low molecular weight products. It has a high solubility not found in shell polysaccharides, all soluble in water, easy to be absorbed and utilized by organisms and many other unique functions, its role is 14 times shell polysaccharides.

Chitooligosaccharide, also known as chitooligosaccharide and oligochitosan, is a kind of oligosaccharide product with polymerization degree between 2 ~ 20 and molecular weight ≤ 3200da, which is a low molecular weight product with good water solubility, high function and high biological activity. It has many unique functions, such as higher solubility than chitosan, completely soluble in water, easy to be absorbed and used by organisms, and its effect is 14 times higher than that of chitosan.