PLLA(5k)-PEG(5k)-BIO is a biotinylation amphiphilic copolymer which can bind strongly to avidin/streptavidin. The amphiphile polymer has hydrophobic block poly(L-lactide) chemically attached to hydrophilic PEG block. The polymer can be used to encapsulate drugs or therapeutic agents in drug delivery system. Reagent grade, for research purpose.