Synthesis, chemical and enzymatic hydrolysis, and bioavailability evaluation in rabbits of metronidazole amino acid ester prodrugs with enhanced water solubility
作者:Nadia M Mahfouz、Maha A Hassan
DOI:10.1211/0022357011776199
日期:2010.2.18
series of amino acid esters (3a-e) have been synthesized and evaluated as potential prodrugs of metronidazole with the aim of improving aqueous solubility and therapeutic efficacy. The aqueous solubility and the lipophilicity (expressed as the log P value) of metronidazole and its esters were investigated. In general the prodrugs revealed enhanced water solubility compared with metronidazole. N,N-diethylglycinate
已经合成了一系列氨基酸酯(3a-e),并作为甲硝唑的潜在前药进行了评估,目的是提高水溶性和治疗功效。研究了甲硝唑及其酯的水溶性和亲脂性(表示为log P值)。通常,与甲硝唑相比,前药显示出增强的水溶性。N,N-二乙基甘氨酸盐酸盐(3a)和4-乙基哌嗪基乙酸盐(3e)衍生物显示出更高的水溶性,比母体药物的水溶性分别高约140和100倍。除4-苯基哌嗪子乙酸酯衍生物(3f)外,所有酯均显示出比甲硝唑更低的log P值,其亲脂性比甲硝唑高6.5倍。在37°C的磷酸盐水溶液(pH 7.4)和80%的人体血浆中研究了酯的水解动力学。在所有情况下,水解均遵循拟一级动力学,并通过HPLC证明定量转化为甲硝唑分析。前药在pH 7.4的磷酸盐水溶液中显示出足够的化学稳定性(半衰期,t1 / 2,4-16小时)。在80%的人类血浆中,它们在几分钟内被水解成甲硝唑。酯3d(甲基哌嗪子乙酸酯衍生物)和3f除外,因为它们的t1