Influence of chain length on thein vitrohydrolysis of model ester prodrugs by ocular esterases
作者:
ChiehShih,
LeeVincent H.L.,
期刊:
Current Eye Research
(Taylor Available online 1982)
卷期:
Volume 2,
issue 10
页码: 651-656
ISSN:0271-3683
年代: 1982
DOI:10.3109/02713688209019993
出版商: Taylor&Francis
数据来源: Taylor
摘要:
In designing ester prodrugs to improve corneal drug bioavailability, it is important to consider the influence of chain length on both corneal permeation and hydrolysis of the prodrug. However, the second factor has received relatively little attention. The purpose of this study was to evaluate whether the ocular hydrolysis of a homologous series ofα-andβ-napthyl esters was influenced by chain length. Solutions of each ester were incubated with selected ocular tissues and fluids of adult albino rabbits. For theα-series peak hydrolytic rate was reached at the caproate (C6) ester, coinciding with minimization in the value of the Michaelis-Menten constant (Km) and maximization in the value of maximum velocity (Vmax). For theβ-series peak hydrolytic rate was reached at the valerate (C5) ester. In contrast to theα-series this was primarily due to a large increase in value for Km. These findings indicate that the rate of ocular esterase-mediated hydrolysis varies within a homologous series of esters, and that this chain length dependency is influenced by the chemical nature of the parent compound.
点击下载:
PDF (445KB)
返 回