Activation of the Hageman factor-prekallikrein system in the whole human blood plasma is studied as affected by organic silica (aerosils) with anionic and cationic properties. Positive- and negative-charged aerosils are shown to possess the same ability to activate prekallikrein. Activity of prekallikrein was manifested in hydrolysis of the chromogenic substrate--Benz-Pro-Phen-Arg-paranitroanilide . HCl, kininogen and protamine sulphate formed by kallikrein. The data permit supposing that optimal activation of the Hageman factor requires the polar (but not ionic) groups with hydrophilic properties on activating surfaces. Plasminogen under contact activation, in contrast to prekallikrein is activated only in the diluted plasma (pH 4.8), and not completely. Possible mechanisms of the contact activation and interaction of the Hageman factor, prekallikrein and high-molecular kininogen in this process are discussed.
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