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Direct coupling of ion-exchange separations to mass spectrometric (MS) detection is increasingly being used for analyses of molecules ranging from organic acids to proteins. These approaches leverage both the exquisite selectivity of the ion-exchange mode for charge-based separation, and the tremendous power of mass spectrometry for identification of unknowns and trace-level quantitation.

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This instalment is the first of a series of four white papers on high performance liquid chromatography (HPLC) modules (pump, autosampler, UV detector, and chromatography data system) to be published in 2019. This instalment provides an overview for analytical-scale HPLC pumps, including their requirements, modern designs, operating principles, trends, and best practices for trouble-free operation.