Osmora Scientific Glossary
TFA
Trifluoroacetic acid — commonly used in peptide purification and able to remain associated with a peptide as a counter-ion or residue.
In plain language
A substance that can remain with a peptide from processing.
Why it matters in research
It is measured specifically, separate from the peptide's own structure.
Where you’ll encounter it
On a COA as a TFA-content result.