Protein interaction with a Pluronic-modified poly(lactic acid) Langmuir monolayer
1Laboratory of Interfaces and Nanostructures, Institute of Chemistry, Loránd Eötvös University, Budapest 112, P.O. Box 32, 1518 Hungary. kissevak@ludens.elte.hu
Journal of Colloid and Interface Science
|July 25, 2008
Summary
Adding Pluronic copolymers to poly(lactic acid) (PLA) surfaces significantly reduces bovine serum albumin (BSA) adsorption. This hydrophilization of PLA with Pluronic enhances surface properties for biomedical applications.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Surface Chemistry
Background:
- Poly(lactic acid) (PLA) is a widely used biomaterial, but its interaction with proteins like bovine serum albumin (BSA) can limit its applications.
- Poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) triblock copolymers, known as Pluronics, can modify surface properties.
Purpose of the Study:
- To investigate the interaction of BSA with PLA layers modified by Pluronic copolymers at air/solution interfaces.
- To evaluate the effect of Pluronic modification on the wettability and protein adsorption of PLA films.
Main Methods:
- Langmuir balance technique to study interfacial behavior of PLA-Pluronic mixtures.
- Langmuir-Blodgett (LB) film transfer to create one-layer films for characterization.
- Tensiometric investigations and atomic force microscopy (AFM) to assess wettability, protein adsorption, and surface morphology.
Main Results:
- Considerable hydrophilization of PLA was achieved with all Pluronics tested (6400, 6800, 10500, 12700).
- Pluronics 6800 and 12700, with longer PEO blocks, significantly reduced BSA adsorption/penetration onto PLA.
- Surface roughness, analyzed by AFM, correlated with BSA interaction; smooth surfaces were obtained with Pluronic 6800 modification.
Conclusions:
- Pluronic modification, particularly with Pluronics 6800 and 12700, effectively hydrophilizes PLA surfaces.
- The density and length of PEO chains in Pluronics control BSA interaction with modified PLA.
- Surface modification with Pluronic 6800 yields smooth PLA films with minimal BSA penetration, indicating potential for improved biomaterial performance.
