For the polysaccharides with immunity enhancement activity, the activity is affected by the constitutes of backbone chain, molecular size, and other factors which cause comformational changes of the polysaccharides.

• 对于免疫增强类多糖 ,多糖的主链组成、相对分子质量等对多糖的功效都产生影响 ,这些影响可能是通过改变多糖的高级结构发挥作用 ;