Abstract
The invertase of Ricinus communis complexes with proteins, polyvinylpyrrolidone, polyethylene glycol, heparin and dextran sulfate. This association produces an increase of invertase activity. The minimal concentration of activator giving the maximal activation was attained at the same molarity for a given amount of enzyme for all macromolecules studied. These conditions are used for the molecular weight determination of the activating substance. The method may be used for the molecular weight determination of polymeric substance with a molecular weight in the range from 5000 to 1000 000 Da.
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