The invention belongs to the technical field of medicinal preparations, and discloses an
insulin oral
selenium nano preparation being capable of promoting the oral absorption of
insulin and having the synergetic
blood sugar decreasing effect of
selenium, and a preparation method of the
insulin oral
selenium nano preparation. According to the preparation method, a selenium-containing
reagent is added into a solution or suspension containing insulin and
chitosan, and selenium /
chitosan nanoparticles loaded with insulin are generated under the effect of a
reducing agent. The insulin oral selenium nano preparation can be effectively loaded with insulin, so that insulin is efficiently loaded into the nanoparticles formed by
chitosan and selenium, therefore, the release and
exposure of insulin in the
gastrointestinal tract after
oral medication are reduced, thus the
gastrointestinal tract stability of insulin is improved, the absorbability and
biological activity of selenium are also improved, and finally, the
bioavailability of insulin and selenium is improved. In addition, with the addition of selenium, the preparation has the effect of decreasing
blood sugar level, meanwhile, the function of the body can be reconstructed through the
oxidation resistance,
blood sugar regulation and insulin-mimetic effect of selenium, the synergetic blood
sugar decreasing effect is realized through the insulin-mimetic effect of selenium, and thus the function of treating both symptoms and root causes of diabetes is realized.