What Is TFA in Peptide Manufacturing?
Trifluoroacetic acid (TFA) is widely used during peptide cleavage and reversed-phase purification. Residual TFA can remain associated with the finished peptide as a counterion. Residual TFA analysis quantifies how much remains, and is an entirely separate measurement from peptide purity.
Published 2026-08-22 · Updated 2026-08-22 · Reviewed by the Lana editorial team
Why is TFA used?
TFA is an effective acid for resin cleavage and produces sharp chromatographic peaks in reversed-phase separations, which improves purification resolution.
Why is residual TFA measured?
Because TFA is retained as a counterion, it contributes to the total mass of the material and can be relevant in sensitive cell-based experimental systems. Quantifying it allows researchers to interpret their own results accurately.
What TFA analysis does not tell you
A low TFA figure says nothing about peptide purity, identity, sterility or endotoxin content.