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During the production of Intraglobin, an i.v. tolerable IgG-immunoglobulin preparation, fraction Cohn II is treated with beta-propiolactone. Thereby the IgG-molecules are chemically modified thus preventing an increase in secondary aggregates which could give rise to adverse reactions in the patients treated with the IgG-preparation. The safety tests described here neither showed any evidence for the presence of unhydrolysed mutagenic-beta-propiolactone in the final product nor that neoantigenic determinants had been created by the reaction of beta-propiolactone with the protein molecules.
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