Extracts with immunological activity were prepared from and . In each case crude mycelial wall was extracted with an aqueous solution of Triton X-100 giving detergent-soluble material. Further fractionation was achieved by removing the detergent from this solution; the resultant precipitate was removed by centrifugation, and the aqueous supernatant was used as a source of soluble antigens. The sensitivity of these preparations was compared with that of water-soluble antigenic material, prepared from whole macerated mycelium, by double diffusion and counterimmunoelectrophoresis using homologous antisera and sera from patients suffering from aspergilloma and allergic bronchopulmonary aspergillosis. The selectivity of these antigenic preparations was monitored with heterologous antisera raised in rabbits. Batch variability was analysed for one strain of using chemical and immunological methods. The nature of the antigenic sites involved in these reactions was investigated by studying the susceptibility of the preparations to proteolytic hydrolysis, periodate oxidation and concanavalin A treatment. The total protein and carbohydrate content of each fraction was determined and the constituent sugars analysed in an attempt to correlate chemical composition with antigenic activity.


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