LL-37 is a 37-amino-acid antimicrobial peptide. Long-chain synthesis is hard, so truncated and impure batches are common in the Australian grey market.
Antimicrobial research peptide
Also known as: Cathelicidin / hCAP-18
Why test LL-37?
LL-37's biological activity depends on the full sequence. Truncated forms (LL-32, LL-25) are common manufacturing impurities and reduce potency. HPLC + LC-MS together catch these.
Common issues we find
Truncated sequences
Low purity (<90%)
Substitution with shorter cathelicidin fragments
Frequently asked questions
What purity should LL-37 be?
Reference-grade LL-37 is ≥95% by HPLC. Anything under 90% likely contains significant truncated peptide content.