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For your reference: For impurity ID, you can use MS, NMR, HPLC, IR, UV. Most of time you need at least 2 methods. If you have that impurity ( ÔÓÖÊ ) reference standard, you can run HPLC to compare the retention time with your impurity. The second method is to use UV by using PDA detector to compare the UV spectrum. If you don¡¯t have impurity standard, greater than 0.1% impurity normally need ID. |
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