Development of the C12Im-Cl-assisted method for rapid sample preparation in proteomic application

Area of Science:

• Biochemistry
• Analytical Chemistry
• Proteomics

Background:

• Mass spectrometry (MS) and chromatography are powerful proteomic tools.
• Clinical proteomics is hindered by slow protein extraction and digestion.
• Ionic liquids offer high solubility and potential for sample processing.

Purpose of the Study:

• To evaluate the cationic surfactant 1-dodecyl-3-methylimidazolium chloride (C12Im-Cl) for clinical proteomic sample preparation.
• To assess the impact of C12Im-Cl on protein digestion efficiency and speed.
• To determine the suitability of C12Im-Cl for formalin-fixed paraffin-embedded (FFPE) tissues.

Main Methods:

• Investigated the compatibility of C12Im-Cl with trypsin for protein digestion.
• Assessed the removal of residual C12Im-Cl using a strong anion exchange membrane.
• Applied C12Im-Cl for rapid protein digestion of FFPE liver cancer tissues.
• Compared protein and peptide identification with traditional filter-aided sample preparation (FASP).

Main Results:

• C12Im-Cl reduced protein digestion time from 16 hours to 1 hour.
• Residual C12Im-Cl was effectively removed prior to MS analysis.
• C12Im-Cl method identified a comparable number of proteins (2705) and peptides (16,682) to FASP (2739 and 17,214).

Conclusions:

• C12Im-Cl facilitates rapid and efficient protein digestion for clinical proteomics.
• This ionic liquid-based method is a promising alternative to traditional sample preparation techniques.
• The C12Im-Cl method shows potential for large-scale clinical proteomic applications.