Layer-by-layer film growth using polysaccharides and recombinant polypeptides: a combinatorial approach

Area of Science:

• Materials Science
• Biotechnology
• Polymer Science

Background:

• Nanostructured films are crucial for applications in tissue engineering and drug delivery.
• Polysaccharides and elastin-like recombinamers (ELRs) are versatile biomaterials for film fabrication.
• Layer-by-layer assembly allows for precise control over film architecture and properties.

Purpose of the Study:

• To investigate the in situ fabrication of polysaccharide-ELR hybrid nanostructured films.
• To determine the optimal conditions for constructing these films using quartz-crystal microbalance with dissipation monitoring (QCM-D).
• To understand the influence of pH, polysaccharide type, and ELR characteristics on film growth.

Main Methods:

• Layer-by-layer assembly of polysaccharide-ELR films.
• In situ monitoring of film buildup using quartz-crystal microbalance with dissipation monitoring (QCM-D).
• ζ-potential measurements to determine charge density at different pH values.
• Voigt-based viscoelastic modeling to estimate film thickness.

Main Results:

• Thicker films were fabricated under near-pKa conditions (pH close to the polysaccharide's acidity constant).
• Hydrophobic interactions between ELRs and partially neutralized polysaccharides favored film construction.
• The molecular weight of ELRs had a minimal impact on film growth tendency.

Conclusions:

• Optimal conditions for fabricating polysaccharide-ELR nanostructured films involve near-pKa pH values.
• These findings enable the tuning of film properties for specific biofunctional applications.
• The study provides a foundation for developing advanced materials for tissue engineering and drug delivery.