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The enzymic activity of noncovalent complexes of alpha-chymotrypsin with polyethylene glycol and a block-copolymer of polyethylene oxide and polypropylene oxide (proxanol) was studied in aqueous-organic media. It was shown that complex formation activated the enzyme in media with a high content of the organic solvent, whereas in systems containing more than 50% water the enzymic activity of complexes was the same as that of the native enzyme. The activation in polyethylene glycol-containing complexes was greater than in complexes with proxanol of the same molecular mass.
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