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其他芳酸类典型药物结构性质、鉴别试验

其他芳酸类典型药物结构性质、鉴别试验. 1. 典型药物的结构与性质. 酯键,可发生异羟肟酸铁反应. 苯环,有紫外吸收. 苯环,有紫外吸收. 游离羧基,弱酸性,不溶于水,与碱成盐,可用酸碱滴定法测定含量. 2. 鉴别试验. 3. 紫外鉴别. (1) 氯贝丁酯鉴别: 用无水乙醇溶解并稀释制成每 l m l 中约含 0. lOmg 的溶液( 1) 与每 lml 中约含 lOpg 的溶液( 2) ,照紫外 - 可见分光光度法(附录 IV A) 测定,溶液( 2) 在 226nm 的波长处有最大吸收,溶液( 1) 在 280nm 与 288nm 的波长处有最大吸收。

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其他芳酸类典型药物结构性质、鉴别试验

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  1. 其他芳酸类典型药物结构性质、鉴别试验

  2. 1.典型药物的结构与性质 酯键,可发生异羟肟酸铁反应 苯环,有紫外吸收

  3. 苯环,有紫外吸收 游离羧基,弱酸性,不溶于水,与碱成盐,可用酸碱滴定法测定含量

  4. 2.鉴别试验

  5. 3.紫外鉴别 (1)氯贝丁酯鉴别:用无水乙醇溶解并稀释制成每l m l 中约含0. lOmg的溶液(1)与每lml中约含lOpg的溶液(2),照紫外-可见分光光度法(附录IV A)测定,溶液(2)在226nm的波长处有最大吸收,溶液(1)在280nm与288nm的波长处有最大吸收。 (2)布洛芬的鉴别:取本品,加0.4%氢氧化钠溶液制成每1ml中含0.25mg的溶液,照紫外-可见分光光度法(附录Ⅳ A)测定,在265nm与273nm的波长处有最大吸收,在245nm与271nm 的波长处有最小吸收,在259nm的波长处有一肩峰。

  6. (3)依他尼酸鉴别:取本品,加盐酸-甲醇(1 :1000 ) 溶解并制成每lml中约含50ug的溶液,照紫外-可见分光光度法(附录IVA)测定,在270nm的波长处有最大吸收。

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