PLLA(1k)-PEG(2k)-BIO is a biotinylation block copolymer which can bind strongly to avidin/streptavidin. The polymer is amphiphilic with hydrophobic block of 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.