amanitins and phalloin

The toxin composition of 25 Amanita phalloides carpophores collected from three sites in Franche-Comté (France) differing in their geological and pedological characteristics was determined and the factors involved in the variations of the toxin concentration in the tissues were identified. The concentrations of the main amatoxins (beta-amanitin, alpha-amanitin, gamma-amanitin) and phallotoxins (phallacidin, phallisacin, phalloidin, phallisin, phalloin) in the six tissues constituting the carpophore, i.e. the cap (C), gills (G), ring (R), stipe (S), bulb (B) and volva (V) were evaluated by using high-performance liquid chromatography. The results analysed statistically showed that the toxin concentrations were tissue dependent, leading to classification of the tissues into two groups (B, V) and (C, G, R, S). The (B, V) group was distinguished by high amounts of phalloidin, phallisin and phallisacin, and the (C, G, R, S) group by the predominance of the amatoxins. The characteristics of the soil of the collection site also affected the toxin concentrations; however, this effect differed from one site to another and was not similar for all the tissues. Finally, the mean toxin profile in the carpophores from the three sites was evaluated. This study underscores the fact that environmental factors and mainly the soil type clearly have an effect on the toxin composition of A. phalloides carpophores.

Topics: Alkaloids; Amanita; Amanitins; Environment; France; Hydrogen-Ion Concentration; Peptides, Cyclic; Phalloidine; Soil