硝普钠的光解分析法及其在透皮吸收研究中的应用

依据已报告的光解分析法原理,建立了定量分析硝普钠的方法。在光源照射下,硝普钠溶液在394nm处吸收度增加属非线性动力学,但对一定浓度溶液,吸收度增量对浓度呈直线关系;无论光照30min或60min,依据△A₃₉₄都能准确地定量。本文方法线性范围50～1000mg/L,日内变异系数<1.9%;日间变异系数<2.6%,回收率99.0～100.1%。共存的少量血清蛋白、十八醇、维生素B₁₂、丙二醇、氮酮以及间硝苯啶、尼群地平、维拉帕米等均不干扰测定。方法已成功地用于透皮吸收剂的研究。

THE PHOTODEGRADATION-ASSAY METHOD OF SODIUM NITROP-RUSSIDE AND ITS APPLICATION TO STUDIES ON PERCUTANEOUS ABSORPTION

A new method of quantitative analysis of sodium nitroprusside (SNP) was developed according to the principle of a photodegradation analytical method that has been reported by the authors previously. After irradiated of solution of SNP under fluorescent lamp, the increase in absorbance at 394 nm belonged to nonlinear kinetics, but the absorbance increment with concentration was linear in certain concentration range of SNP. When irradiated for 30 min or 60 min, SNP in solution can be quantitated accurately by delta A394. The standard curve of this method was linear from 50 to 1000 mg/L. The within-day and day-to-day precisions (RSD) were 1.9% and 2.6% respectively, with recoveries of 99.0-100.1%. No interference from small amount of serum protein, stearyl alcohol, propylene glycol, azone, m-nifedipine, nitrendipine and verapamil was observed. This method has been successfully applied to study percutaneous absorption.