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catwithdog

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My experience for you as a reference, wish it help.
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Yes. You need ID for these three unknown impurities. But you may not ×ÔÐкϳÉÔÓÖʶÔÕÕÆ·. It may cost too much.
1.        Normally you can request all the impurities from API suppliers. They will provide you a very small amount impurity standard for free or pay a little.
2.         If these impurities are not from start materials or intermediates or side products, they should be your drug degradants.
3.        You can confirm these impurities with your forced degradation studies and get some ideas on what kind of structures may be. Then based on LC-MS results, likely you can get the structures from fragments. For this type of work, if you have any questions or need help, please let me know.
4.        You do the same ID for brand(Ô­ÑÐ) drug by LC-MS. If your three impurities are the same as these from brand drug, you don¡¯t need do toxicity study since you are working on generic drug. But you need  ¶¨Á¿. You can easily buy these impurities which may not sale as a reference standard. You can qualify them as your reference standard.
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24Â¥: Originally posted by zihuadd at 2012-11-02 15:54:15
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26Â¥2012-11-03 11:45:45
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25Â¥: Originally posted by catwithdog at 2012-11-03 05:17:56
My experience for you as a reference, wish it help.
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Yes. You need ID for these three unknown impurities. But you may not ×ÔÐкϳÉÔÓÖÊ¶Ô ...

Thank yoiu for your answer and suggestion!
API suppliers do not control impurities,since I have asked them.I think these impurities may derive from drug degradants in the process.If they aren't the impurities that I have bought , I must  carry out  experiment of LC-MS to insure their structure.
Thank you very much for your help!
27Â¥2012-11-03 12:05:18
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