Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 5, Pages 1619-1624Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am3032025
Keywords
poly-gamma-glutamate; antimicrobial; thermoplastic; nanofiber; archaeal polymer; cationic surfactant
Funding
- Innovation Promotion Program (Eco-Innovation) of NEDO under MATI
- Nanotechnology Platform Program (Molecule and Material Synthesis) of MEXT, Japan
- Grants-in-Aid for Scientific Research [24655209] Funding Source: KAKEN
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Here we describe a stoichiometric ion-complex of archaeal poly-gamma-L-glutamate (L-PGA) and hexadecylpyridinium cation (HDP+), called PGAIC, which shows remarkable chemical resistance and potential as a novel functional thermoplastic. PGAIC films suppressed the proliferation of prokaryotic (Escherichia coli, Bacillus subtilis, Salmonella typhimurium, and Staphylococcus aureus) and eukaryotic (Saccharomyces cerevisiae) microorganisms. Moreover, its antifungal activity was demonstrated against a prevalent species of Candida (Candida albicans) and a filamentous fungus (Aspergillus niger). The minimal inhibitory concentrations were estimated as 0.25 mg mL(-1), and zones of growth inhibition appeared when PGAIC-coated polyethylene terephthalate (PET) films were placed in culture plates, whereas PET had very little effect on fungal growth. Soluble PGAIC thus shows promises as an antimicrobial and as a coating substrate. We also succeeded in synthesizing an L-PGA-based nanofiber using an ethanol solution of PGAIC.
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