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复方制剂中氨基比林与溴甲酚绿形成稳定的离于对，用氯仿萃取后在４１６．８ｎｍ处测定吸收度．回收率为９９．８０％，相对标准偏差为０．９２％（ｎ＝５）。方法简便快速，结果准确可靠。
Aminopyrine and bromocresol green in compound preparations form a stable off-pair, and the absorbance is measured at 416.8 nm after extraction with chloroform. The recovery was 99.80% with a relative standard deviation of 0.92% (n = 5). The method is simple and fast, the result is accurate and reliable.