Sigma-Aldrich Leupeptin

Sigma-Aldrich leupeptin is an organic compound produced by actinomycetes, serine and cysteine proteases reversibly. inhibits trypsin-like proteases and some cysteine proteases including endoproteinase lys-c, kallikrein, papain, thrombin, cathepsin b and trypsin. mw:426.56 s 49.04 . 18.02 {c20h36n6o4 . 1/2h2so4 . h2o} ac-leu-leu-argininal (hemi-sulfated form). thus material has three tautomeric isomers that can be visualized by chromatography. appearance: white amorphous powder working range 10-100mum. stable for several hours in water. stock solutions of 10mm in water are stable for 1 week at 4ºc and 6 months at -20ºc. 5mg/1.054 ml = 10mm. typically dilute 1:100 for a 100mum working solution. source: organic isolated from actinomycetes. - SIAL (Additional S&H Or Hazmat Fees May Apply)