The arsenic speciation was determined in macrofungi of the Ramaria genus with HPLC coupled to inductively coupled plasma mass spectrometry. Besides arsenic species that are already known for macrofungi, like arsenobetaine or arsenocholine, two compounds that were only known from marine samples so far (trimethylarsoniopropanate and dimethylarsinoylacetate) were found for the first time in a terrestrial sample. An unknown arsenical was isolated and identified as homoarsenocholine. This could be a key intermediate for further elucidation of the biotransformation mechanisms of arsenic.

Institute of Chemistry University of Graz Universitaetsplatz 1 8010 Graz Austria

Nuclear Physics Institute Czech Academy of Sciences Hlavní 130 25068 Husinec Řež Czech Republic; Institute of Geology Czech Academy of Sciences Rozvojová 269 16500 Prague 6 Czech Republic

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