ポリ-γ-グルタミン酸ナノファイバーによる金属イオンの吸着特性

抄録

Poly-γ-glutamic acid(γ-PGA)is a natural polymer that is widely recognized as a component in the viscous filaments of fermented soybean (natto). γ-PGA is known for its superior biodegradability‚ biocompatibility‚ water retention and sorption of metal ions. We used oxazoline component polymer(OXA) for crosslinking agent and prepared γ-PGA nanofiber from γ-PGANa by the electrospinning with a non-toxic water solvent system. In this study, we evaluated metal sorption characteristics of γ-PGA/OXA webs. At low concentration solution of copper ions‚ the γ-PGA material dissolved and didn’t cohere‚ but γ-PGA/OXA webs shrank by the sorption of metal ions, and salt precipitated on its surface. When γ-PGA/OXA webs contained OXA with a very small or a large quantity‚ its sorption rate or sorption ability was decreased. A tendency was found to adsorb divalent or trivalent metal ions, and reflect the shrinkage of the γ-PGA/OXA web.