Amino-Acid-Derived Anionic Polyacrylamides with Tailored Hydrophobicity-Physicochemical Properties and Cellular...

Area of Science:

• Polymer Chemistry
• Biomaterials Science
• Cellular Biology

Background:

• Polyanions internalize into cells via endocytosis, making them promising for biomedical applications.
• Tailoring polyanion properties like hydrophobicity is crucial for effective cellular interactions and drug delivery.

Purpose of the Study:

• To synthesize amino-acid-derived polyanions with controlled hydrophobicity and alkyl branching.
• To investigate the physicochemical properties and cellular interactions of these novel polyanions.

Main Methods:

• Reversible addition-fragmentation chain-transfer (RAFT) polymerization followed by postpolymerization modification.
• Characterization using size-exclusion chromatography, NMR, and infrared spectroscopy.
• Evaluation of hydrophobicity, surface charge, pH dependence, and cell association with L929 fibroblasts.

Main Results:

• Successfully synthesized amino-acid-derived polyanions with varied alkyl side-chains.
• Determined similar pKa values to poly(acrylic acid) despite hydrophobicity differences.
• Observed slow cell association and membrane accumulation, with higher association for more hydrophobic polymers.

Conclusions:

• Macromolecular engineering of charge and hydrophobicity is key for polymer-cell membrane association and internalization.
• Amino-acid-derived polymers offer diverse properties for advanced drug delivery systems.