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| in such a large proportion in the mixture that it can saturate the column, leading to irreproducible retention times, as the maximum of the peak can wander. thus ,it may be advantageous to select a compound other than the API that is added to , or present in , the mixture in an amount sufficiently large to be detectable and sufficiently low as not to saturate the column, and to use that compound as the reference marker. |
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