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You can set up lower than 0.01% peak area of  your working standard. Or you don¡¯t set up which is 0.
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Normally individual unknown impurity in our in house method should less than 0.2%, total impurities should less than 2%. There is no Çø±ð between generic drug and brand drug. However, we set up different acceptable limit for phase I, phase II, phase III drug. For phase I stage, our acceptable limit is relative loose.
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