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Stabilization of Liposomes Attached to Polymer Surfaces Having Phosphorylcholine Groups
1Institute for Medical and Dental Engineering, Tokyo Medical and Dental University, 2-3-10, Kanda-Surugadai, Chiyoda-ku, Tokyo, 101, Japan
Journal of Colloid and Interface Science
|August 15, 1997
Summary
omega-methacryloyloxyalkyl phosphorylcholine (MAPC) polymers better maintain the structure of dipalmitoylphosphatidylcholine (DPPC) liposomes upon adsorption compared to poly(HEMA). MAPC surfaces show more sensitive temperature responses and slower disruption of adsorbed liposomes.
Area of Science:
- Biomaterials Science
- Surface Chemistry
- Polymer Science
Background:
- Liposome adsorption on polymer surfaces is crucial for biomaterial applications.
- Understanding the interaction between liposomes and polymer coatings informs the design of biocompatible materials.
- Phosphorylcholine-containing polymers are known for their biomimetic properties.
Purpose of the Study:
- To evaluate the adsorption state of dipalmitoylphosphatidylcholine (DPPC) liposomes on omega-methacryloyloxyalkyl phosphorylcholine (MAPC) polymer surfaces.
- To compare the adsorption behavior and structural integrity of DPPC liposomes on MAPC versus poly(2-hydroxyethyl methacrylate) (HEMA) surfaces.
- To investigate the influence of polymer structure on liposome-surface interactions and temperature-dependent phase transitions.
Main Methods:
- Quartz Crystal Microbalance (QCM) was used to monitor liposome adsorption in real-time.
- Atomic Force Microscopy (AFM) was employed to visualize the morphology of adsorbed liposomes on polymer surfaces.
- Temperature-dependent phase transitions of adsorbed liposomes were analyzed.
- Disruption of adsorbed liposomes using a nonionic surfactant was monitored via QCM.
Main Results:
- QCM showed greater frequency change (indicating more adsorption) on poly(HEMA) compared to MAPC.
- MAPC surfaces exhibited more sensitive temperature responses related to DPPC liposome phase transitions.
- Disintegration of liposomes on MAPC surfaces resulted in a slower return to baseline frequency compared to poly(HEMA).
- AFM revealed that DPPC liposomes maintained their spherical shape on MAPC surfaces, unlike on poly(HEMA).
Conclusions:
- DPPC liposomes adsorb to MAPC polymer surfaces while largely retaining their original structure.
- Adsorbed DPPC liposomes on poly(HEMA) surfaces appear to penetrate the hydrated layer and alter their structure.
- MAPC polymers offer a more stable platform for liposome adsorption compared to poly(HEMA), preserving liposome integrity.