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BioUltra, microbial, ≥95% (HPLC)

Acetyl-Leu-Leu-Arg-al, N-Acetyl-L-leucyl-L-leucyl-L-argininal hemisulfate salt, Leupeptin hemisulfate salt
Linear Formula:
C20H38N6O4 · 1/2H2SO4
CAS Number:
Molecular Weight:
MDL number:
PubChem Substance ID:

Quality Level

biological source


product line



≥95% (HPLC)




H2O: 50 mg/mL

storage temp.


SMILES string




InChI key


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5, 25, 100 mg in glass bottle

Biochem/physiol Actions

Inhibitor of serine and cysteine proteases. Inhibits plasmin, trypsin, papain, calpain, and cathepsin B. Does not inhibit pepsin, cathepsins A and D, thrombin, or α-chymotrypsin. Effective concentration 10-100 μM. There have been numerous studies using leupeptin to protect against hearing loss caused by acoustic overstimulation or the ototoxic antibiotic gentamicin. (Loss of cochlear hair cells is believed to be mediated by calpain.)

Analysis Note

Leupeptin gives multiple peaks on HPLC due to equilibria among three forms in solution. Purity determined using three main peaks. Majority of contaminating peptide is racemized leupeptin.

Storage Class Code

11 - Combustible Solids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificate of Analysis

Certificate of Origin

More documents

Quotes and Ordering

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