Capillary electrophoresis-mass spectrometry using an in-line sol–gel concentrator for the determination of methionine enkephalin in cerebrospinal fluid

In this study, a CE-MS method using a monolithic sol–gel concentrator for in-line solid-phase extraction (SPE) is evaluated for the analysis of methionine enkephalin in biological samples. Operational SPE parameters such as sample pH, loading volume, elution volume and composition have been studied....

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