Journal
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
Volume 21, Issue 4, Pages 710-714Publisher
SOC BRASILEIRA QUIMICA
DOI: 10.1590/S0103-50532010000400018
Keywords
biodegradation; mycotoxin; submerged fermentation
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The objective was to evaluate the capacity of Aspergillus oryzae and Rhizopus oryzae to degrade deoxynivalenol (DON) during submerged fermentation. The submerged medium utilized was sterile distilled water with 1 mu g mL(-1) DON, added and inoculated with 4 x 106 spores mL(-1) of the fungal species. Sampling was performed every 48 h to 240 h. DON analyses included residual mass, percentage and velocity of degradation. Residual mass of DON in the collected medium was extracted by liquid-liquid partition and quantified by gas chromatography through derivation with trifluoroacetic anhydride. The time required for the largest DON degradation was 96 h and 240 h by Aspergillus oryzae and Rhizopus oryzae respectively, and degradation rate were 0.62 and 0.54 mu g h(-1), respectively. Rhizopus oryzae caused the largest decrease in DON at around 90% in 240 h, while Aspergillus oryzae caused the most rapid degradation with a 74% reduction of DON at 96 h.
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