CHROMATOGRAPHIC FRACTIONATION OF THE NON-DIALYZABLE PORTION OF MOSQUITO EXTRACT AND INTRACUTANEOUS REACTIONS OF MOSQUITO-BITE-SENSITIVE SUBJECTS TO THE SEPARATED COMPONENTS

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Abstract
An extract of each of Aedes aegypti (L.), A. atropalpus (Coq.), and Culex pipiens (L.) was shown by paper chromatography to contain 12 ninhydrin-staining peptides. None of these peptides from the A. aegypti extract was capable of eliciting skin reactions in a volunteer sensitive to A. aegypti bites. A reaction equivalent to that caused by a mosquito bite was produced by an estimated 10−3 g of dialyzed A. aegypti extract from which the ninhydrin-staining peptides had been removed. Of the solvents tested in attempting to fractionate this active material, the most suitable was 65% acetone. By this means, A. aegypti extract was shown to contain at least four fractions capable of producing skin reactions in volunteers sensitive to A. aegypti bites.

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