Acetate Salt
Also known as: peptide acetate · TFA salt · salt form · net peptide content
The salt form peptides are supplied as; net peptide content is slightly below the raw weight because of the counter-ion.
Synthetic peptides are almost always supplied as a salt — commonly an acetate salt — because the purification process leaves a counter-ion associated with the peptide’s charged groups. This makes the powder stable and handleable.
It matters for accuracy: the "net peptide content" is slightly less than the raw powder weight, since part of the mass is the counter-ion (and bound water). A quality Certificate of Analysis states the salt form and, ideally, the net peptide content.
Acetate is generally preferred over trifluoroacetate (TFA) salts for research where the counter-ion should be inert.
RELATED TERMS
Purity
The percentage of a sample that is the intended peptide, as measured by HPLC — the headline quality figure.
Certificate of Analysis (CoA)
A batch-specific lab document reporting a compound’s identity and purity — the primary proof of what is in the vial.
Molar Mass
The mass of one mole of a compound (in g/mol or Daltons) — used to convert between milligrams and moles.
Reconstitution
The process of dissolving a lyophilised (freeze-dried) peptide in a sterile solvent such as bacteriostatic water before study.
Educational content, not medical advice. All products supplied for research purposes only — not for human consumption.