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koalaone木蟲 (小有名氣)
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[求助]
氣相測殘留溶劑的回收率要求是多少?
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最近在做一原料殘留溶劑的方法學(xué)驗(yàn)證,但測得的回收率比較高,問一下氣相測殘留溶劑的回收率官方要求是多少?![]() |
木蟲 (正式寫手)
新蟲 (初入文壇)
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My experience as your reference: 1. 氣相測殘留溶劑的回收率: 80%-120%. 2. 原料殘留溶劑的方法學(xué)驗(yàn)證,但測得的回收率比較高: since you are working on 原料殘留溶劑, 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 回收率比較高 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. |
木蟲 (正式寫手)
新蟲 (小有名氣)
木蟲 (小有名氣)
金蟲 (小有名氣)

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