Adsorption
Adsorption — The adhesion of molecules to a surface, a concern when peptides bind to glass or plastic vial surfaces, reducing effective concentration.
What Is Adsorption?
Adsorption is the adhesion of peptide molecules to surfaces (glass, plastic, metal, filters). It is a significant cause of peptide loss, especially at low concentrations (< 1 mg/mL), where surface adsorption can consume a substantial fraction of the total peptide. Hydrophobic peptides adsorb more aggressively than hydrophilic ones.
Prevention Strategies
- Low-bind plasticware: Surface-treated polypropylene tubes and tips reduce nonspecific binding
- Surfactants: 0.01-0.05% Polysorbate 20/80 in formulation prevents surface adsorption
- Siliconized glass: Silanized vials reduce peptide binding to glass surfaces
- Carrier protein: 0.1% BSA in assay buffers blocks nonspecific surface binding
- Higher concentration: Prepare stock solutions at high concentration; surface loss is proportionally smaller
Frequently Asked Questions
What is Adsorption?
The adhesion of molecules to a surface, a concern when peptides bind to glass or plastic vial surfaces, reducing effective concentration.
Why is Adsorption important in peptide research?
Adsorption is a fundamental concept in chemistry 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.