The invention relates to a method for preparing recombinant
human growth hormone entrapped sustained-release
drug microcapsules. According to the method, a degradable multi-arm
polyethylene glycol-
polylactic acid block
polymer material with good
biocompatibility is taken as a vector material, and raw materials are easily obtained; the multi-arm
polymer has relatively small hydrodynamic volume and relatively low
viscosity, and the degradation rate of the multi-arm
polymer is higher than that of linear polymers, so that the loading and delivery of drugs are more facilitated; a multi-arm
polyethylene glycol-
polylactic acid block
copolymer has good
drug loading capacity and unique amphiphilicity, so that
protein adsorption can be prevented, the recognition and
phagocytosis of a reticuloendothelial
system are avoided, and the physiological barrier is easy to pass; the method disclosed by the invention is simple and does not need a complicated re-
emulsion formation process; the microcapsules are good in stability, the
bioavailability of recombinant
human growth hormone is improved, and the content of the recombinant
human growth hormone reaches up to 46-81%; the
entrapment rate of the recombinant human
growth hormone entrapped sustained-release
drug microcapsules reaches 91%, the stability is good, the grain size is uniform, and the
repeatability is good, so that the recombinant human
growth hormone entrapped sustained-release drug microcapsules are suitable for large-scale production.