Stationary Phase
Stationary Phase — The fixed phase in chromatography through which the mobile phase flows. In reverse-phase HPLC, typically a C18-bonded silica column packing.
What Is a Stationary Phase?
The stationary phase is the immobile phase in a chromatographic system that interacts differentially with analytes, causing their separation. In peptide HPLC, the stationary phase is typically C18 (octadecylsilane) or C8 (octylsilane) bonded silica, where peptides are retained by hydrophobic interactions with the alkyl chains.
Stationary Phases for Peptides
- C18: Most common. Strong retention of hydrophobic peptides. Standard for purity analysis and preparative purification
- C8/C4: Shorter alkyl chains for large, very hydrophobic peptides and proteins that bind too strongly to C18
- Phenyl: Pi-pi interactions with aromatic residues (Trp, Phe, Tyr). Orthogonal selectivity to C18
- HILIC: Hydrophilic interaction chromatography for very polar, hydrophilic peptides that don't retain on C18
Frequently Asked Questions
What is Stationary Phase?
The fixed phase in chromatography through which the mobile phase flows. In reverse-phase HPLC, typically a C18-bonded silica column packing.
Why is Stationary Phase important in peptide research?
Stationary Phase 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
- Stationary Phase on Wikipedia
- Search Stationary Phase on PubChem (NIH)
- Research articles on ScienceDirect