Abstract
A copolymer of N-isopropylacrylamide and N-acryloylpyrrolidine, which exhibits a lower critical solution temperature (LCST) at 38°C, having a didodecyl group at the chain terminal was synthesized and calcein-loaded liposomes were prepared from a mixture of dioleoylphosphatidylethanolamine and the copolymer. While the contents release from the copolymer-modified liposomes was strongly accelerated around the LCST of the copolymer, some extent of the release was also observed below the LCST, probably because the partly-dehydrated copolymer chains interacted with the liposome membrane. When poly(ethylene glycol) with the number average molecular weight of 550 having a didodecyl group at the chain end was introduced into the copolymer-modified liposomes, the contents release from the copolymer-modified liposomes was effectively suppressed below the LCST but hardly affected above the LCST. As a result, the liposomes exhibited much sharper enhancement of the contents release in a narrow temperature region. The temperature-sensitive contents release property of the copolymer-modified liposomes became less significant in the presence of serum. However, inclusion of the anchor-bearing poly(ethylene glycol) derivative improved the contents release behavior of the copolymer-modified liposomes in the presence of serum.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
