title: [Isolation and properties of chymotrypsin and trypsin labeled with iodine radioisotopes].
abstract: Comparative study of iodination of chymotrypsin and trypsin was carried out using either iodine monochloride or the electrochemical procedure under conditions of controlled anode potential. It was shown that a part of iodine monochloride was consumed for oxidation of protein molecules. As a result of this process specific activity of the enzymes was decreased down to 50-60% of the initial activity after introduction of 2 atoms of iodine per a molecule. The similar degree of iodination under mild conditions of electrolysis in potentiostatic experiments caused considerably lower decrease in the enzymatic activity, reaching 5-10% of the initial activity (after introduction of I atom of iodine per a molecule--2.5%); labelling of trypsin and chymotrypsin by means of iodine radionuclides is promising for various medico-biological purposes.
mesh_terms: D002850:Chromatography, Gel; D002918:Chymotrypsin / Q000032:analysis / Q000037:antagonists & inhibitors* / Q000302:isolation & purification; D006868:Hydrolysis; D066298:In Vitro Techniques; D007457:Iodine Radioisotopes; D007700:Kinetics; D011854:Radiochemistry; D014357:Trypsin / Q000032:analysis* / Q000302:isolation & purification; D014361:Trypsin Inhibitors
chemical_list: D007457:Iodine Radioisotopes; D014361:Trypsin Inhibitors; D002918:Chymotrypsin; D014357:Trypsin
vernacular_title: Poluchenie i svoĭstva khimotripsina i tripsina, mechennykh radioizotopami ĭoda.