Sequential depletion coupled to C18 sequential extraction as a rapid tool for human serum multiple profiling

Area of Science:

• Biochemistry
• Analytical Chemistry
• Proteomics

Background:

• Human serum analysis is crucial for disease diagnostics.
• Existing methods for serum peptide profiling can be time-consuming and complex.
• There is a need for rapid, efficient, and cost-effective analytical tools.

Purpose of the Study:

• To present a novel, rapid methodology for human serum multiple profiling.
• To develop a cost-effective and simple approach for peptide extraction and analysis.
• To demonstrate the utility of the method in classifying biological samples.

Main Methods:

• Sequential chemical depletion of serum using DTT and ACN.
• Fast protein digestion utilizing ultrasonic energy.
• Peptide concentration via C18 Zip-tips and sequential extraction with varying ACN concentrations.
• Mass spectrometry profiling of peptide extracts using MALDI-TOF.

Main Results:

• Successful classification of 40 individuals (20 healthy, 20 non-healthy) with q-value < 0.05.
• Demonstrated the effectiveness of MALDI-TOF spectra for sample classification.
• The method proved to be rapid, simple, and cost-effective.

Conclusions:

• The presented methodology offers a cheap, simple, and fast approach for human serum peptide profiling.
• This technique has broad applicability for serum samples and other complex biological fluids.
• The method shows significant potential for diagnostic and research applications in proteomics.