Controlled drug loading and release of a stimuli-responsive lipogel consisting of poly(N-isopropylacrylamide) particles and lipids

J Phys Chem B. 2013 Aug 22;117(33):9677-82. doi: 10.1021/jp402826n. Epub 2013 Aug 9.

Abstract

Environmentally responsive materials are attractive for advance biomedicine applications such as controlled drug delivery and gene therapies. Recently, we have introduced the fabrication of a novel type of stimuli-sensitive lipogel composite consisting of poly(N-isopropylacrylamide) (pNIPAM) microgel particles and lipids. In this study, we demonstrated the temperature-triggered drug release behavior and the tunable drug loading and release capacities of the lipogel. At room temperature (22 °C), no calcein was released from the lipogel over time. At body temperature (37 °C), the release process was significantly promoted; lipids in the lipogel acted as drug holders on the pNIPAM scaffold carrier and prolonged the calcein release process from 10 min to 2 h. Furthermore, the loading and release of calcein could be effectively controlled by modulating the relative amount of lipids incorporated in the lipogel, which can be realized by the salt-induced lipid release of the lipogel.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acrylic Resins / chemistry*
  • Drug Carriers / chemistry*
  • Fluoresceins / chemistry
  • Gels / chemistry
  • Kinetics
  • Lipids / chemistry*
  • Temperature

Substances

  • Acrylic Resins
  • Drug Carriers
  • Fluoresceins
  • Gels
  • Lipids
  • poly-N-isopropylacrylamide
  • fluorexon