Hydrolysis of 5-chloro-7-iodo-8-quinolinol conjugates catalyzed by metal ions.

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Glucuronide (CF-G) and sulfate (CF-S) of 5-chloro-7-iodo-8-quinolinol were hydrolyzed in water in the presence of metal ions at pH 7. In this condition, CF-G was hydrolyzed more easily than CF-S. The rate of the hydrolysis, pseudo-first order reaction, was in parallel with the stability constants of 8-quinolinol-metal complexes. The rate of hydrolysis increased with reduction of concentration of H+ and tris buffer suppressed the hydrolysis of CF-G. These results suggest that metal catalyzed hydrolysis of CF-G and CF-S was derived from the formation of complexes between the conjugates and metal ions.

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