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catwithdog

新虫 (初入文坛)


【答案】应助回帖


koalaone: 金币+1 2012-11-13 07:54:07
My experience as your reference:
1.        气相测残留溶剂的回收率: 80%-120%.
2.        原料残留溶剂的方法学验证,但测得的回收率比较高: since you are working on 原料残留溶剂, you cannot add your  reference standard to placebo to measure your recovery. You only can use  原料 +  80%, 100%, 120% working standard solution (100% working standard solution is ICH limit level) to calculate recovery%. To troubleshooting 回收率比较高
1)        When you measure your sample(原料), you may measure your sample n=3 or 5 to get mean value.
2)        Prepare sample in a fast or correct way (我100mg定容到1ml, this is not normal way to do, the volume is too low that will be difficult to manage sample evaporation) to avoid sample evaporation.
3)        Sample + matrix interaction may cause this issue too. You can try different solvent (matrix) to dissolve your sample.
4)        If still cannot get right recovery%, you may try internal standard or external standard method.
11楼2012-11-13 03:48:41
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koalaone

木虫 (小有名气)

引用回帖:
9楼: Originally posted by asz_yy at 2012-11-12 15:52:47
最近我也在做这个,请问你是怎么做的?称多少mg样品定容到多少ml的量瓶中,我100mg定容到1ml,测得结果偏低,你怎么会偏高呢?

结果偏低可能一方面是配制样品的过程中溶剂挥发;另一方面是环境温度影响,由于室内温度低,打开空调后温度升高,溶液体积增大,配置的样品溶液浓度会减小,也会使回收率降低。
置于我做的回收率偏高,可能与我们实验室气相室的温度低有关,其他原因还没找到。
12楼2012-11-13 07:52:03
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