Fig. 1From: Multistage pH-responsive codelivery liposomal platform for synergistic cancer therapyCharacterization of DPRP and DSPE-PEG2000-DPRP/DSPE-PEG2000-CPP. a Principle of DPRP synthesis. b The positive ion electrospray ionization mass spectrum of DPRP. c Principle of the synthesis of DSPE-PEG2000-DPRP/DSPE-PEG2000-CPP. d MALDI-TOF mass spectra of DSPE-PEG2000-DPRP and (e) DSPE-PEG2000-CPPBack to article page