The invention belongs to the technical field of animal immunopotentiators, and particularly relates to weaned piglet immunoregulation nanoparticles with
liver targeting and a preparation method thereof.The preparation method comprises the following steps that S1,
galactomannan is added into deionized water, butyl
glyceride is added after stirring and dissolving, the pH is adjusted, a reaction is conducted under
shielding gas, and a mixture is obtained; after the reaction is finished, dialyzing, purifying and freeze-
drying to obtain butyl
glyceride modified
galactomannan; s2, dissolving the butyl
glyceride modified
galactomannan prepared in S1 into a
buffer solution, stirring until the butyl glyceride modified galactomannan is dissolved, dropwise adding a
silibinin ethanol solution into the
buffer solution, and performing ultrasonic reaction to obtain
silibinin-galactomannan self-assembled nanoparticles; and S3, adding a cross-linking agent into the
silibinin-galactomannan self-assembled nanoparticles, carrying out a cross-linking reaction, then carrying out
dialysis purification, and carrying out
freeze drying so as to obtain the immunoregulation nanoparticles. According to the invention, silibinin is used as an immunomodulator, and based on the natural recognition characteristics of galactomannan and
mannose receptors on the surfaces of weaned
pig liver kuhn cells and dendritic cells, the nano packaging efficiency and stability of galactomannan to silibinin are enhanced by using the hydrophobic characteristic of butyl glyceride; the invention constructs a novel immunomodulator with weaned piglet
liver targeting.