Lipase-catalyzed transformation of unnatural-type poly(3-hydroxybutanoate) into reactive cyclic oligomer

Yasushi Osanai, Kazunobu Toshima, Naoko Yoshie, Yoshio Inoue, Shuichi Matsumura

研究成果: Article

抜粋

Unnatural-type syndiotactic and atactic poly[(R,S)-3-hydroxybutanoate]s [P(3HB)s] were enzymatically transformed into a reactive cyclic 3HB oligomer of molecular weight ca. 500 in an organic solvent, such as toluene, using immobilized lipase from Candida antarctica at 40°C for 24 h. It was confirmed that similar results were obtained for both syndiotactic and atactic P(3BHB)s. On the other hand, the acidic degradation of these polymers using a protonic acid, such as p-toluenesulfonic acid, exclusively produced the linear 3HB oligimer instead of the cyclic oligomer. The formation of the cyclic oligomer was regarded as the characteristic feature of the lipase-catalyzed degradation in organic media. The cyclic oligomer obtained readily reacted with alcohol as a nucleophile, and using lipase, to produce the alkyl ester of the 3HB oligomer.

元の言語English
ページ(範囲)88-94
ページ数7
ジャーナルMacromolecular Chemistry and Physics
203
発行部数4
出版物ステータスPublished - 2002 3 15

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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