The mycotoxin deoxynivalenol (DON) occurs often in wheat grain and is frequently associated with its modified form DON-3-glucoside (DON-3-Glc). Ozone (O3) is a powerful disinfectant and oxidant that reacts easily with specific compounds including mycotoxins. It degrades DON in aqueous solution and can be effective for grain decontamination. This study reports the efficacy of gaseous ozone treatments in reducing DON, DON-3-Glc, bacteria, fungi and yeasts in naturally contaminated durum wheat. A prototype was used to dispense ozone continuously and homogeneously at different concentrations and exposure time. The optimal conditions, which do not affect chemical and rheological parameters of durum wheat, semolina and pasta, were identified (55 g O3 h-1 for 6 h). The measured mean reductions of DON and DON-3-Glc in ozonated wheat were 29% and 44%, respectively. Ozonation also produced a significant (p<0,05) reduction of total count (CFU/g) of bacteria, fungi and yeasts in wheat grains.
Il deossinivalenolo (DON) è una micotossina importante che si ritrova spesso nelle granaglie ed è frequentemente associato alla sua forma modificata DON-3-glucoside (DON-3-Glc). L'ozono (O3) è un potente disinfettante e ossidante che degrada il DON in soluzione acquosa e potrebbe essere efficace se usato direttamente sulle cariossidi. Questo studio riporta l'efficacia dei trattamenti con ozono gassoso nel ridurre DON, DON-3-Glc, batteri, funghi e lieviti in grano duro naturalmente contaminato. Un prototipo è stato utilizzato per erogare l'ozono in modo continuo e omogeneo a diverse concentrazioni e tempi di esposizione. Sono state identificate le condizioni ottimali che non influiscono sui parametri chimici e reologici del grano duro, della semola e della pasta (55 g di O3 h-1 per 6 ore). L'ozonizzazione ha prodotto una riduzione significativa (p<0,05) del conteggio totale (CFU/g) di batteri, funghi e lieviti, di DON (29%) e DON-3-Glc (44%).
Effetto dei trattamenti con ozono gassoso su DON contaminanti microbici e parametri tecnologici di frumento e semola
2018
Abstract
The mycotoxin deoxynivalenol (DON) occurs often in wheat grain and is frequently associated with its modified form DON-3-glucoside (DON-3-Glc). Ozone (O3) is a powerful disinfectant and oxidant that reacts easily with specific compounds including mycotoxins. It degrades DON in aqueous solution and can be effective for grain decontamination. This study reports the efficacy of gaseous ozone treatments in reducing DON, DON-3-Glc, bacteria, fungi and yeasts in naturally contaminated durum wheat. A prototype was used to dispense ozone continuously and homogeneously at different concentrations and exposure time. The optimal conditions, which do not affect chemical and rheological parameters of durum wheat, semolina and pasta, were identified (55 g O3 h-1 for 6 h). The measured mean reductions of DON and DON-3-Glc in ozonated wheat were 29% and 44%, respectively. Ozonation also produced a significant (p<0,05) reduction of total count (CFU/g) of bacteria, fungi and yeasts in wheat grains.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
