Reversed-Phase HPLC and Hyphenated Analytical Strategies for Peptidomics
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Peptide study and analysis widely involve liquid chromatography. Among the different strategies available, reversed-phase
liquid chromatography (RP-HPLC) is one of the methods of choice to separate species in a nontargeted approach. The compounds
are sorted according to their hydrophobicity, even though the experimental order of elution could change according to the
nature of the mobile phase and the stationary phase. In our work, we have developed protocols to resolve hundred of peptidic
species. To overcome the limitations of peak capacity of RP-HPLC alone, it has been coupled downstream to tandem mass spectrometry
using two different ionization modes. To overcome the limitations of peak capacity of RP-HPLC MS/MS, it has been coupled upstream
to strong cation exchange liquid chromatography. Multidimensional analysis allows for a deeper description of a sample because
the limit of detection is often due to a lack of dynamic range of the detection itself rather than due to a lack of sensitivity.
In this chapter, different protocols are presented. They should be considered as examples that could be used as starting point
for new protocols optimization. Even if RP-HPLC is a universal peptide separation method, it should be optimized according
to the specific characteristics of the peptide(s) of interest.