Soybean trypsin inhibitor (SBTI) first crystallized by Kunitz (1945) is one of several such inhibitors found in soybeans. A single Arginine-Isoleucine bond is cleaved by trypsin, a covalent bimolecular complex of inhibitor and trypsin results. On dissociation either virginal or modified inhibitor appears. Activity: 1mg inhibits 1.2 mg of trypsin (1mg trypsin 180 TAME units, 10,350 BAEE units, 3450 USP/NF units) Unit Definition: One Unit hydrolyzes one umole of TAME/min. at 25C, pH 8.2, in the presence of 0.1M calcium. A280 mg/ml: As Reported Storage and Stability: Lyophilized product is stable for 6 months after receipt at 4C. For maximum recovery of product, centrifuge the original vial prior to removing the cap.
Molecular Weight:
21.5
Purity:
Chromatographically purified (90%, verified by SDS-PAGE).
Form:
Supplied as a lyophilized powder.
CAS Number:
[9035-81-8]
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