Search for the substances causing allergic contact dermatitis by chrysanthemums on the growers / 日本農村医学会雑誌

ABSTRACT

Since 1976, allergic contact dermatitis caused by <I>Chrysanthemum morifolium</I> Ramalk (commercial name Kinriki) occured on the grower in Tokushima Prefecture. Consequently, a systematic study aimed at the isolation of the allergen of the chrysanthemum was udertaken.<BR>The allergens were contained in the fresh juice of the leaves of chrysanthemum and they were of two types one was water-soluble and the other was fat-soluble, judging from the results of application test of the skin reaction for sensitized guinea pigs.<BR>The fresh juice of the chrysanthemums was fractionated with ammonioum sulfate saturation method and the active precipitates were chromatographed on Sephacryl S-300 and DEAE-cellulose column, successively. The most active fractions contained sugar and protein, suggesting that the water-soluble principles are high molecular glyco-protein. The other hand fat-soluble fraction was obtained from ethyl acetate extract of the supernatant of 65% ammonium sulfate saturation. The extract was chromatographed on silica gel column and on the thin layer to yield 5, 7-dihydroxychromone (I) and sesquiterpens (II-VI). Unfortunately, at that time the sensitization of ginea pigs was unsuccessfuly. Therefore their compounds could not be tested for the allergenic reaction.<BR>When the precipitates of ammonium sulfate were extrcted with ethyl acetate, the allergenic activeity of the precipitates decreased. However, re-addition of the ethyl acetate extracts to the extracted precipitates recovered the activity. Cross reaction between the juice of leaves and sesquiterpene lactone, alantolactone, failed on skin reaction of sensitized ginea pigs.