High-throughput biopolymer desalting by solid-phase extraction prior to mass spectrometric analysis

Area of Science:

• Biochemistry
• Analytical Chemistry
• Molecular Biology

Background:

• Mass spectrometry (MS) is crucial for analyzing peptides, proteins, and DNA, enabling high-throughput identification, sequencing, and genotyping.
• Non-volatile buffers in samples significantly reduce the sensitivity and accuracy of MS biopolymer analysis.
• Effective removal of contaminants like inorganic ions is essential before MS analysis.

Purpose of the Study:

• To develop a rapid and effective method for desalting DNA oligonucleotides and peptides.
• To ensure sample purity for enhanced mass spectrometry-based biopolymer analysis.
• To meet the stringent requirements for applications like protein digest analysis and DNA genotyping.

Main Methods:

• Utilized 96-well solid-phase extraction (SPE) plates containing Waters Oasis HLB sorbent.
• Employed a reversed-phase sorbent to retain biopolymers while washing out inorganic ions with deionized water.
• Eluted purified DNA oligonucleotides and peptides using a 70:30 acetonitrile-water solution.

Main Results:

• Developed a fast and efficient SPE method for desalting biopolymers.
• Successfully retained target analytes (DNA oligonucleotides and peptides) while removing inorganic ion contaminants.
• Achieved high purity of samples suitable for downstream MS applications.

Conclusions:

• The developed SPE method provides a reliable and efficient means for desalting peptides and DNA oligonucleotides.
• This technique significantly enhances sample quality for mass spectrometry, improving accuracy and sensitivity.
• The method is well-suited for high-throughput applications including protein analysis and DNA genotyping.