Iodine-131 Labeling of Purified Microbial Antigens by Microdiffusion

Abstract
Conventional methods for introduction of I-133 may modify or destroy the serological reactivity of labile microbial antigens. A modified microdiffusion iodination method that eliminates the exposure of antigens to excess oxidizing agent produced satisfactory trace labeling of a purified protective angiten of Bacillus anthracis and enterotoxin-B of Staphylococcus aureus with-out detectable change in precipitating activity. The iodinated antigens are suitable for use in the (NH4)2SO4 coprecipitation technique of Farr.

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