| abstract |
A fine particle comprising an amphiphilic polymer, further comprising an inner nucleus of hydrophilic segment of amphiphilic polymer, and a hydrophobic outer layer of hydrophobic segment of amphiphilic polymer, and having a surface modifier bonded to the hydrophobic outer layer. A fine particle of the invention effectively enclose protein, peptide drug, nucleic acid medicine of hydrophilic property and large molecular weight in the inner nucleus of hydrophilic segment of amphiphilic polymer, and are preferable for stabilizing in the body and promoting absorption. |