The invention discloses a preparation method and use of a
thioctic acid-modified
polyethylene glycol-polyaminoacid amphiphilic triblock
copolymer. A hydrophilic chain of the amphipathic triblock
polymer is
polyethylene glycol, a middle hydrophobic
chain segment of the amphipathic triblock
polymer is poly(benzyl glutamate), a
tail hydrophobic
chain segment of the amphipathic triblock
polymer is polyphenylalanine and the
side chain of the middle
chain segment is modified through
thioctic acid. The amphipathic triblock polymer is self-assembled in water to form a polymer nanometer
micelle with
polyethylene glycol as an outer crown,
thioctic acid-modified poly(benzyl glutamate) as a middle shell and polyphenylalanine as an inner core. Through crosslinking of the nanometer
micelle, the stable reduction-sensitive shell crosslinked nanometer
micelle is obtained so that the nanometer micelle is not easily dissociated
in vitro and in blood and thus stability of a nanometer micelle-coated
drug is guaranteed. When the nanometer micelle enters a tumor
cell, the nanometer micelle can be fast crosslinked and dissociated so that the
drug can be fast released and produces high treatment effects. The amphipathic triblock polymer solves the problems of
drug leakage
in vivo, low conveying efficiency and slow release in cells.