title: Development of antimicrobial thermoplastic material from archaeal poly-γ-L-glutamate and its nanofabrication.
abstract: Here we describe a stoichiometric ion-complex of archaeal poly-γ-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.
authors: Agricultural Science, Graduate School of Integrated Arts and Sciences, Kochi University, Nankoku, Kochi 783-8502, Japan. ashiuchi@kochi-u.ac.jp
authors: Makoto
authors: M
authors: Ashiuchi
authors: Kenzo
authors: K
authors: Fukushima
authors: Haruna
authors: H
authors: Oya
authors: Toshihumi
authors: T
authors: Hiraoki
authors: Shigeo
authors: S
authors: Shibatani
authors: Nogiho
authors: N
authors: Oka
authors: Hirokazu
authors: H
authors: Nishimura
authors: Hirofumi
authors: H
authors: Hakuba
authors: Masahiko
authors: M
authors: Nakamori
authors: Masaru
authors: M
authors: Kitagawa
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects; D005658:Fungi / Q000187:drug effects; D006216:Halobacteriaceae / Q000737:chemistry / Q000378:metabolism*; D006358:Hot Temperature; D008826:Microbial Sensitivity Tests; D010969:Plastics / Q000737:chemistry* / Q000494:pharmacology; D011099:Polyglutamic Acid / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology*
chemical_list: D000890:Anti-Infective Agents; D010969:Plastics; D011099:Polyglutamic Acid