Size Exclusion Chromatography (SEC)
Size Exclusion Chromatography (SEC) — A chromatographic method that separates molecules based on their hydrodynamic radius, used to detect peptide aggregation and determine molecular size.
What Is Size-Exclusion Chromatography?
Size-exclusion chromatography (SEC, also called gel filtration) separates molecules by hydrodynamic size. Larger molecules elute first because they cannot enter the pores of the column packing, while smaller molecules diffuse into pores and elute later. SEC is the gold standard method for detecting and quantifying peptide aggregation.
Peptide Applications
- Aggregate detection: Quantifies monomer, dimer, and higher-order aggregate percentages
- MW estimation: Calibration with protein/peptide standards estimates molecular weight
- Buffer exchange: Desalting columns (small SEC) rapidly exchange peptide from one buffer to another
- Formulation QC: Monitors aggregate levels in formulated peptide products during stability studies
Frequently Asked Questions
What is Size Exclusion Chromatography (SEC)?
A chromatographic method that separates molecules based on their hydrodynamic radius, used to detect peptide aggregation and determine molecular size.
Why is Size Exclusion Chromatography (SEC) important in peptide research?
Size Exclusion Chromatography (SEC) is a fundamental concept in analytical 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.
Authority Sources
- Size Exclusion Chromatography (SEC) on Wikipedia
- Search Size Exclusion Chromatography (SEC) on PubChem (NIH)
- Research articles on ScienceDirect