[Study of free radical reactions in proteins by a recombination-kinetic method]

In terms of the polychronous kinetics model there were obtained values of efficient activation energy (Eeff) for a slow reaction of the death of free macroradicals in UV-irradiated at 77K silk fibroin and tendons with 80 and 15% humidity. In silk fibroin Eeff equals 6 +/- 1 kkal.mole-1 at 313-413 K and 14 +/- 1 kkal.mole-1 at 413-453 K. In the tendons with 80% humidity at 193-233 K Eeff = 1 +/- 0.5 kkal.mole-1, and at 233-252 K Eeff = 2 +/- 0.5 kkal.mole-1. In the tendons with 15% humidity in the region of 313-373 K there is a distribution for Eeff from Emin = 0 kkal.mole-1 to Emax = 33 +/- 1 kkal.mole-1. At 373-413 K Eeff = 0.