Composition comprising a polycationic triblock copolymer and polyanionic polymer and the physiologically active peptide

A physiologically active peptide stability was loaded with biological implantation composition provides A formula (I) represented by the tri-block copolymer and polyanionic polymer and the physiologically active peptide composition comprising the same: CNR-PEG-CNR (I) In the formula, CNR is independently a polymer segment containing a repeating unit including a cyclic nitroxide radicals attached to the polymer backbone through a linking group containing at least one amino group as part of a pendant group, PEG is a segment comprising a poly (ethylene glycol).