Synthesis and characterization of antimicrobial colloidal polyanilines

Area of Science:

• Materials Science
• Nanotechnology
• Antimicrobial Research

Background:

• Colloidal polyaniline (PANI) has limited antimicrobial applications due to poor solubility and low potency.
• Existing PANI formulations face challenges in common organic solvents and scalability.

Purpose of the Study:

• To enhance the solubility and antimicrobial efficacy of polyaniline.
• To develop a functionalized PANI (fPANI) with silver nanoparticles (Ag) for improved performance.

Main Methods:

• Synthesized functionalized PANI (fPANI) using aniline and 3-aminobenzoic acid.
• Incorporated silver nanoparticles (Ag) onto fPANI via AgNO3 addition.
• Assessed solubility qualitatively and particle size using dynamic light scattering.
• Evaluated antimicrobial activity against Staphylococcus aureus, Escherichia coli, and Bacteriophage PhiX 174.

Main Results:

• fPANI exhibited improved solubility compared to PANI.
• fPANI-Ag colloids showed a significant reduction in particle size (1322 nm to 473 nm), indicating enhanced dispersion.
• fPANI-Ag demonstrated superior antimicrobial potency, halving the minimum bactericidal concentration (MBC) and minimum virucidal concentration (MVC) compared to fPANI alone.

Conclusions:

• The combination of fPANI and Ag nanoparticles effectively enhances solubility and antimicrobial activity.
• fPANI-Ag colloids present a promising candidate for biomedical applications.
• Further research into scale-up is warranted for potential commercialization.