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Characterization of clinical lots and commercial AST disks of gentamicin by LC-MS. The percentage of each of the major gentamicin congeners was computed by the extracted ion count (EIC) based on the congener molecular weights from the mass spectroscopy signal. The bars on the left of the graph illustrate the range of the acceptance criteria for gentamicin clinical batches. Points that lie outside this range are outlined in black.
