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  • Title: Behavior of myclobutanil, propiconazole, and nuarimol residues during lager beer brewing.
    Author: Navarro S, Pérez G, Vela N, Mena L, Navarro G.
    Journal: J Agric Food Chem; 2005 Nov 02; 53(22):8572-9. PubMed ID: 16248555.
    Abstract:
    Over a 4 month brewing process, the fate of three fungicides, myclobutanil, propiconazole, and nuarimol, was studied in the spent grain, brewer wort, and final beer product. Only the residual level of myclobutanil after the mashing step was higher than its maximum residue limit (MRL) on barley. A substantial fraction was removed with the spent grain in all cases (26-42%). The half-life times obtained for the fungicides during storage of the spent grains ranged from 82 to 187 days. No significant influence of the boiling stage on the decrease of the fungicide residues was demonstrated. During fermentation, the content reduction varied from 20 to 47%. After the lagering and filtration steps, no significant decrease (<10%) was observed in any of the residues. Finally, during storage of the beer (3 months), the amounts of fungicides fell by 25-50% of their respective concentrations in the finished beer.
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