Peptide glossary · Analysis
Counterion
The ion that balances the charge of a peptide salt, such as trifluoroacetate or acetate. Counterions count towards the weighed mass but not towards the peptide.
In the lab
Every positively charged group binds a counterion. Strongly basic peptides therefore carry more counterion and often have a lower peptide content.
More terms: Analysis
- AggregationPeptide molecules clumping together, often with hydrophobic sequences.
- Amino acid analysisA method in which the peptide is fully hydrolysed and the individual amino acids are measured.
- Area percentThe unit of HPLC purity: the main peak's area divided by the area of all peaks.
- ChromatogramThe curve an HPLC run produces: detector signal over time.
- DeamidationA degradation route in which asparagine or glutamine lose their amide group.
- EndotoxinsCell wall components of certain bacteria that can strongly distort cell experiments.
For laboratory research use only. Not for use in humans or animals.