3种计算方法测定阿司匹林含量的比较研究

目的:比较3种计算方法测定阿司匹林、水杨酸双组分体系中阿司匹林含量的方法。方法:配制系列浓度的水杨酸、阿司匹林混合标准品溶液,于230nm～350nm波长范围内进行扫描,记录2组分在265、295、320.5nm波长处的吸收度,分别采用等吸收双波长法、近似倍率系数法、水杨酸浓度分级近似计算法进行数据处理,计算阿司匹林回收率。结果:3种方法测定阿司匹林回收率分别为(99.11±1.68)%、(98.82±1.17)%、(96.23±4.10)%。结论:近似倍率系数法测定结果波动小,比较稳定,对大量样品的测定而言,其不失为一种简单有效的方法。

Content Determination of Aspirin: Comparison among 3 Calculation Methods

OBJECTIVE: To compare 3 different calculation methods in the determination of aspirin in the bicomponent (aspirin and salicylic acid) system. METHODS: Different concentrations of mixed standard solution of aspirin and salicylic acid were prepared and scanned under a wavelength ranged from 230nm to 350nm. The absorbabilities of the 2 constituents were recorded at 265nm, 295nm and 320.5nm, and the data were treated with Iso-absorption diplo-wavelength method, proximal multiplying factor coefficient method and SA concentration fractional approximate calculation method. The recoveries of aspirin were calculated. RESULTS:The recoveries of aspirin determined by 3 different methods were (99.11±1.68)%, (98.82±1.17) % and (96.23±4.10)%, respectively. CONCLUSION: The proximal multiplying factor coefficient method is stable with little fluctuation in determination results, which proved to be simple while effective for the determination of sample at a great quantity.