Table 1.

The stirring and dialyzing time and MWCO of the copolymers synthesis

Reaction mixture	Stirring (day)	Dialyzing (day)	MWCO (kDa)
PEG-b-PBLG	3	3	7
PEG-b-PELG	2	3	3.5
PEG-b-(PELG-g-PZLL)	3	3	7
PEG-b-(PELG-g-(PZLL-r-PLL))	3	3	7

Abbreviations: MWCO, molecular weight cutoff; PEG-b-PBLG, poly(ethylene glycol)-b-poly(γ-benzyl l-glutamate); PEG-b-PELG, poly(ethylene glycol)-b-poly (ethylenediamine l-glutamate); PEG-b-(PELG-g-PZLL), poly(ethylene glycol)-b-(poly(ethylenediamine l-glutamate)-g-poly(ε-benzyoxycarbonyl-l-lysine)); PEG-b-(PELG-g-(PZLL-r-PLL)), poly(ethylene glycol)-b-(poly(ethylenediamine l-glutamate)-g-poly(ε-benzyoxycarbonyl-l-lysine)-r-poly(l-lysine)).