Thomas Letzel | Authors

Articles

Design of Experiment Strategy for an Electrospray Ionization Optimization in Supercritical Fluid Chromatography–Mass Spectrometry Coupling

The optimization of adjustable factors in electrospray ionization (ESI) by design of experiments (DoE) is presented. This approach allows a comprehensive and systematic optimization of all relevant factors for the ionization of compounds and increases the understanding about factor influences on the ionization efficiency.

LC–API-MS(/MS) for Biological Samples: Importance of Hydrophobicity, Molecular Weight and Structural Development

The combination of reversed-phase high performance liquid chromatography (RP-HPLC), atmospheric pressure ionization (API), mass spectrometry (MS) and tandem mass spectrometry (MS/MS) is ideal for determining and characterizing analytes in complex biological matrices. This review looks at the importance of parameters such as hydrophobicity, ionization properties, molecular mass and, partially, the molecular structure resulting from applied LC–MS–MS systems in analytical laboratories. The use of these parameters to investigate biomolecules and their unambiguous identification is also described.