HPLC reports the proportion of peptide-related material that is the target peptide. Endotoxin is not peptide-related and does not appear in that accounting.
It is also potent far below the level any such method would register. A quantity that would not move a purity figure at all can dominate a cell-culture result.
Recombinant expression in bacterial systems is the obvious route — the host is the source. Beyond that, water, glassware and handling can all introduce it, and it is heat-stable enough to survive autoclaving.
Synthetic peptides have no bacterial step in their production, which lowers but does not eliminate the concern, since everything downstream of synthesis is still an opportunity.
For cell-based work, particularly anything involving immune cells or inflammatory readouts, where endotoxin can generate the effect being attributed to the compound. For chemical and analytical work it is generally not relevant.
It is worth knowing it is a separate test, so that a certificate reporting identity and purity is not mistaken for one that has addressed it.
HPLC reports the proportion of peptide-related material that is the target peptide. Endotoxin is not peptide-related and does not appear in that accounting.
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Supplied for laboratory research use only. Not for human or veterinary consumption. REVIVE LAB UAE provides no dosing, administration or protocol guidance.