Desalting
Desalting — The removal of salts and small molecules from a peptide solution, typically performed by size exclusion chromatography or dialysis.
What Is Desalting?
Desalting is the removal of salts and small molecules from a peptide solution, typically by gel filtration (PD-10, G-25 columns), dialysis, or solid-phase extraction (C18 ZipTip). Desalting is essential before MS analysis (salts suppress ionization), lyophilization, and cell-based assays.
Methods
- PD-10 / G-25: Gravity-flow gel filtration. Fast, gentle, preserves bioactivity
- C18 ZipTip: Peptide binds C18 resin, salts wash through, peptide eluted with acetonitrile
- MWCO spin filter: 3 kDa cutoff retains peptides, passes salts through
Frequently Asked Questions
What is Desalting?
The removal of salts and small molecules from a peptide solution, typically performed by size exclusion chromatography or dialysis.
Why is Desalting important in peptide research?
Desalting is a fundamental concept in laboratory as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.