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Peptide standards and tryptic digests of ribonuclease B are separated by comprehensive two-dimensional reversed phase liquid chromatography (RPLC) and capillary zone electrophoresis (CZE) and detected on-line by electrospray mass spectrometry. The RPLC column is coupled to the CZE column by a transverse flow gating interface. A new rugged microelectrospray needle is described that combines high ionization...
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