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【单选题】
ChP2015 阿司匹林肠溶片(标示量 50mg/ 片)含量测定:I色谱条件与系统适用性试验用十八烷基硅合硅胶为填充剂,以乙腈 - 四氢呋喃 - 冰醋酸 - 水( 20 : 5 : 5 : 70) 为流动相;检测波长为 276mn 。理论板数按阿司匹林峰计算不低于 3000 ,阿司匹林峰与水杨酸峰的分离度应符合要求。( 2 )测定法取本品 20 片,精密称定( 1.3982g ),充分研细,精密称取片粉 13.85mg (约相当于阿司匹林 10mg) ,置于 100ml 量瓶中,加 1% 冰醋酸的甲醇溶液强烈振摇使阿司匹林溶解并稀释至刻度,滤膜滤过 , 取续滤液作为供试品溶液,精密量取 10μl 注人液相色谱仪,记录色谱图,峰面积为 19663 ;另取阿司匹林对照品,精密称定,加 1% 冰醋酸的甲醇溶液溶解并定量稀释制成每 0.l mg/ml 的溶液,同法测定,峰面积为 19543 。按外标法以峰面积计算标示量的百分含量 ( )
A.
101.6%
B.
102.3%
C.
100.5%
D.
102.1%
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