Preparation and thermo-sensitivity behavior of polymer liposomes made of poly(2-ethylacrylic acid) alkylamide derivatives

The temperature-sensitive liposomes were constructed by poly(2-ethylacrylic acid) (PEAA) alkylamide derivatives that were synthesized for partially modification of carboxylic groups. The thermal characteristics of liposomes were investigated by using fluorescent indicator, particle size device and fluorescence spectrophotometer system. The results showed that the liposome made of fatty amine-modified poly(2-ethylacrylate) had a marked thermal sensitive release of drugs, which is correlated with the structure of molecular of polymer and the initial ratio of composition of phospholipid. The PEAA-associated-liposomes were also shown pH-sensitive drug release under acidic condition. The poly (2-ethylacrylate) for the preparation of medium-induced thermal liposomes in vitro experiments showed a good thermal characteristics and the methods of preparing temperature-sensitive liposomes were convenient and stability.