Hydrophilic thiol probe

Abstract

The present invention provides a probe that further promotes ionization in proteomic analysis using mass spectrometry, and a high-sensitive mass spectrometry method for a protein using such a probe. Further, the present invention provides an ionization-enhancing probe that can be used even for a protein that has a high degree of hydrophobicity and quickly turns over, and a high-sensitive mass spectrometry method for a protein using such a probe. A thiol probe for a protein, which is represented by the following formula (I): [Chemical Formula 1] wherein R1 represents a linker group, and R2 represents a substituted ammonium group or a substituted amino group. A mass spectrometry method for a protein, comprising the steps of: obtaining a modified protein by reacting the thiol probe with a protein to be subjected to mass spectrometry; and subjecting the modified protein to mass spectrometry.

Dependencies are inferred from the claim text.