TFA Removal Service

What is TFA and How Is It Used in Peptide Synthesis?

Peptide synthesis and purification heavily rely on TFA (trifluoracetic acid). TFA is used during several key steps, including:

Cleavage of the peptide from the resin
Removal of protection groups from the amino acid side chains
HPLC purification

While free TFA is removed during purification and freeze-drying, it also protonates side-chain amino functionalities of amino acids and the free N-termini of peptides. As a result, peptides are typically obtained as TFA salts. The anionic TFA acts as a counter ion for positively charged sidechains and the N-terminus. Therefore, the amount of TFA depends on the peptide sequence and can range between 10%-45% TFA.

Because peptides are commonly supplied as TFA salts, many researchers consider obtaining peptides with TFA removed before sensitive biological applications.

Do you really need TFA removal services?

TFA removal from peptides is a frequently requested service in peptide research and development. Before requesting TFA removal, it is important to understand whether it is necessary for your specific application. We encourage you to review the information below to determine whether TFA removed peptides will meaningfully improve your results — or whether your assay will perform well without it.

When Does TFA Matter?

As TFA is a strong acid, it can impact biological assays and affect their accuracy and reproducibility. However, for most assays the amount of TFA in the final assay preparation is so low that it does not cause any problems. If your peptide is highly diluted before use, TFA removal is rarely necessary.

Assays that might be sensitive to TFA:

Cellular assays
API study
Immunotherapy research

In these cases, TFA removal from peptides may improve assay stability and reproducibility.

A Quick Self-Check

Before requesting TFA removal, consider:

What is the final peptide concentration in your assay?
What is the final estimated TFA concentration?
Is your system pH-sensitive?
Have you observed unexplained variability that could be acid-related?

If the calculated TFA concentration in your assay is negligible, counter ion exchange or TFA removal may not provide measurable benefit.

How to remove TFA from peptides

Many researchers ask: How to remove TFA from peptides? TFA removal is typically performed via counter ion exchange. This process replaces trifluoroacetate (TFA⁻) with alternative counter ions such as:

Acetate
Hydrochloride

For biological applications, replacement with acetate is recommended, because it is less acidic than both TFA and hydrochloric acid.

Contact US

At JPT, peptides are processed under controlled conditions to ensure clean counter ion exchange and reliable TFA removal, preserving peptide integrity and purity. Contact us to discuss your application and determine whether receiving peptides with TFA removed is necessary for your project.
You also can always take a look on our resources page. We are happy to support you with any technical problems and peptide design.