Aprotinin inhibits the activity of several proteolytic enzymes such as chymotrypsin, kallikrein, plasmin and trypsin. It is present in blood and in most tissues, with a high concentration in lung, inhibits pro-inflammatory cytokine release and maintains glycoprotein homeostasis. In platelets, aprotinin reduces glycoprotein loss (e.g., GpIb, GpIIb/IIIa), while in granulocytes it prevents the expression of pro-inflammatory adhesive glycoproteins
Aprotinin is a natural proteinase inhibitor polypeptide consisting of 58 amino acids arranged in a single polypeptide chain, cross-linked by three disulfide bridges and having a molecular mass of 6512D.
Biological Activity:
~6000 KIU (Kallikrein Inactivator Units) per mg, 4.85 TIU/mg.
Unit Definition:
1 Unit corresponds to 1 biological kallikrein inhibitor unit (KIU).
1 TIU ~1300 KIU.
Storage and Stability:
Lyophilized powder may be stored at -20 degrees C. Stable for 12 months at -20 degrees C. Reconstitute with sterile ddH2O, 0.1% HSA or BSA. Aliquot to avoid repeated freezing and thawing. Store at -20 degrees C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.
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