Remotely Controlled Diffusion from Magnetic Liposome Microgels

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• 作者：Jaroslav Hanu拧 ; Martin Ullrich ; Ji艡铆 Dohnal ; Mandeep Singh ; Franti拧ek 艩t臎p谩nek
• 刊名：Langmuir
• 出版年：2013
• 出版时间：April 2, 2013
• 年：2013
• 卷：29
• 期：13
• 页码：4381-4387
• 全文大小：331K
• 年卷期：v.29,no.13(April 2, 2013)
• ISSN：1520-5827

文摘

The reversible, temperature-dependent change in the permeability of a phospholipid bilayer has been used for controlling the diffusion rate of encapsulated molecular payload from liposomes. Liposomes were preloaded with a fluorescent dye and immobilized in calcium alginate hydrogel microparticles that also contained iron oxide nanoparticles. The composite microparticles were produced by a drop-on-demand inkjet method. The ability of iron oxide nanoparticles to locally dissipate heat upon exposure to a radio-frequency (RF) alternating magnetic field was used to control the local temperature and therefore diffusion from the liposomes in a contactless way using an RF coil. Several different release patterns were realized, including repeated on-demand release. The internal structure of the composite alginate鈥搇iposome鈥搈agnetite microparticles was investigated, and the influence of microparticle concentration on the heating rate was determined. In order to achieve a temperature rise required for the liposome membrane melting, the concentration of alginate beads should be at least 25% of their maximum packing density for the nanoparticle concentration and specific absorption rate used.