Protein Orientation and Polymer Phase Separation Induced by Poly(methyl methacrylate) Tacticity

Area of Science:

• Polymer Science
• Materials Science
• Biotechnology

Background:

• Stereochemistry of polymers influences their physicochemical and biological properties.
• Polymer film properties are crucial for applications like protein microarray substrates.
• Poly(methyl methacrylate) (PMMA) tacticity's role in protein interactions requires investigation.

Purpose of the Study:

• To investigate the effect of PMMA tacticity on polymer thin film interactions with proteins.
• To study the influence of PMMA tacticity on phase separation in PMMA/poly(tert-butyl methacrylate) (PtBMA) blends.
• To explore the fabrication of protein microarrays using tacticity-controlled polymer blends.

Main Methods:

• Fabrication and characterization of isotactic, atactic, and syndiotactic PMMA thin films.
• Surface analysis using secondary ion mass spectrometry and contact angle measurements.
• Protein adsorption studies with albumin and fibrinogen.
• Investigation of phase separation in PMMA/PtBMA blends for microarray fabrication.

Main Results:

• Isotactic PMMA (iso-PMMA) exhibited reduced polar ester group exposure, leading to lower protein adsorption.
• Surface chemistry modifications altered protein orientation on iso-PMMA films.
• Phase separation in atactic PMMA/PtBMA (at-PtBMA) blends yielded 2D domain structures.
• Selective protein adsorption to PtBMA domains was observed on patterned iso-PMMA/at-PtBMA blends.

Conclusions:

• PMMA tacticity critically affects surface properties and protein interactions.
• Controlled phase separation in tacticity-defined blends allows for patterned protein microarray fabrication.
• This approach offers a method for creating biomaterial surfaces with tailored protein immobilization.