The invention relates to the technical field of nano-materials, in particular to a monatomic nano-
enzyme drug delivery system for IBD treatment and a preparation method and application of the monatomic nano-
enzyme drug delivery system. The monatomic nano
enzyme delivery system provided by the invention comprises an iron-doped monatomic nano enzyme Fe-SA,
curcumin Cur and
hyaluronic acid grafted
dopamine HAD, the Fe-SA and the Cur form a Fe-SA / Cur compound through a coordination effect, and the surface of the Fe-SA / Cur compound is coated with the HAD. According to the iron-doped monatomic nano-enzyme Fe-SA, Fe atoms in the iron-doped monatomic nano-enzyme Fe-SA are distributed in a graded carbon-based matrix of the Fe-SA in a Fe-N4 co-
doping form, and the iron-doped monatomic nano-enzyme Fe-SA has efficient SOD and CAT nano-enzyme activity, and can realize
antioxidant self-
cascade nano-enzyme reaction, effectively remove
active oxygen and improve the
pathological environment. According to the preparation method disclosed by the invention, a coordination compound Fe-SA / Cur is constructed by utilizing the iron-doped monatomic nano-enzyme and the
curcumin, so that the anti-inflammatory effect is improved, and the characteristic of poor water
solubility of the
curcumin is effectively improved. According to the invention, HAD is loaded on the outer layer of a coordination compound Fe-SA / Cur to construct an oral monatomic
antioxidant cascade nano-
enzyme system, high
acid resistance and targeted delivery capability are realized by using the remarkable stability and negative charges of HAD, and
oral administration is effectively realized. In-vivo and in-vitro experiments show that the monatomic nano-enzyme delivery
system provided by the invention can effectively remove intestinal free radicals, improve the intestinal environment, reduce the expression of
inflammatory factors, promote the
recovery of damaged tissues and effectively treat
colitis. The invention provides a new thought and method for biomedical research and
drug development of
inflammatory bowel diseases.