Servizio Comunitario di Informazione in materia di Ricerca e Sviluppo - CORDIS

The fate of organophosphates during the malting and brewing processes

The fate of organophosphates (registered for seeds treatment in several European countries), during the malting and brewing processes was accurately stated.

Pirimiphos-methyl was applied to two identical batches of barley at a rate of 10mg/kg using pilot malting drums. After one week, each batch was malted, one to give an ale malt and the other to produce a lager. Samples were taken throughout processing and analysed for residues of pirimiphos-methyl.

About half of the pirimiphos-methyl applied was taken up by the barley. Most of the remaining chemical was washed out of the drums with the first steep water. Approximately 8% of the residues were lost during steeping. Up to 24% could be lost during germination but the greatest losses occurred during kilning (about 43%). The finished malt contained less than 20% of the residues of the starting barley. The amount of pesticide residue in the beer is such that, only if all survived the fermenting process, would it come within normal residue detection parameters.

Reported by

Ministry of Agriculture, Fisheries and Food - Central Science Laboratory
Sand Hutton
YO4 1LZ York
United Kingdom


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