Acceleration and Inhibition of the Hydrolysis of Penicillin G by Dimerization and Cyclodextrin Inclusion

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概要

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• Quantitative treatments for the equilibrium and kinetics of dimerizing, cyclodextrin (CD)-binding, and hydrolyzing systems in unbuffered and buffered solutions have been developed and applied to hydrolysis and pH data on the penicillin G (PCG)-CD system. By dimerization of PCG, the acidic hydrolysis of PCG is accelerated, whereas the basic hydrolysis is inhibited. This result is explicable in terms of electrostatic interactions of the PCG dimer with hydrogen ion and hydroxide ion, similar to the micellar effect on chemical reactions. In buffered solutions, the acidic hydrolysis of PCG is inhibited by all of α-, β, and γ-CDs. This is explained in terms of the reaction mechanism and the enolation of the secondary hydroxyl group of CD. γ-CD inhibits the acidic hydrolysis most effectively of the three CDs, since its binding constant is the greatest among them. The dimer of PCG can be incorporated into γ-CD, but not incorporated into α- and β-CDs. In a 154 mmol dm^<13> potassium chloride solution, the acidic hydrolysis of 5 mmol dm^<-3> PCG is enhanced by α- and β-CDs. This striking result can be explained by the catalysis of hydrogen carbonate ion. A commercial sample of α-CD catalyzes the acidic hydrolysis of PCG linearly with the concentration of α-CD, whereas a purified sample catalyzes the same reaction, following Michaelis-Menten-like kinetics. CDs, particularly γ-CD, may be used as an additive for the stabilization of PCG.

• 公益社団法人日本薬学会の論文
• 1997-04-15

著者

• Funasaki N

  Department Of Physical Chemistry 21st Century Coe Program Kyoto Pharmaceutical University

• Funasaki Noriaki

  Department Of Physical Chemistry Kyoto Pharmaceutical University

• FUNASAKI Noriaki

  Kyoto Pharmaceutical University

• NEYA Saburo

  Department of Physical Chemistry, Graduate School of Pharmaceutical Sciences, Chiba University

• Neya S

  Graduate School Of Pharmaceutical Sciences Chiba University

• Neya Saburo

  Department Of Physical Chemistry Graduate School Of Pharmaceutical Sciences Chiba University

• Neya Saburo

  Department Of Physical Chemistry Kyoto Pharmaceutical University

• Neya Saburo

  Kyoto Pharmaceutical University

• HADA Sakae

  Kyoto Pharmaceutical University

• Funasaki Noriaki

  Kyoto College of Pharmacy

• Hada Sakae

  Kyoto College of Pharmacy

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