The influence of Cytochrome c on the polycondensation of silicic acid

The polycondensation kinetics of silicic acid was measured cryoscopically in a temperature interval between 5 degrees C and 35 degrees C. Unlike polyamines such as polyallylamine, polylysine or polyarginine, catalitical amounts of Cytochrom c have a distinct retarding influence on the polycondensation kinetics. The Arrhenius analysis of the experimental reaction rates with and without Cytochrome c determines an invariant activation energy of E-A(CC/wo) = (69.9 +/- 0.7) kJ/mol, while the pre-exponential factors differ by Delta kappa(0) = (1 x 10(8)+/- 8 x 10(7)) s(-1). The latter can be attributed to a three-times pejoration of a sterical factor, which then indicates, that the adsorption of reactive silicic acid oligomers on the protein is dominating the reaction rate.