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Ozone owns high oxidative potential against a broad microbial spectrum and can be applied directly in grain and seed for decontamination fungal and mycotoxin reduction. Thus, the objective of this work was to evaluate the effect of ozonation in the control of fungi and on sunn hemp seeds quality. For this, a cylindrical column of 15 cm diameter PVC was used for ozonation at different heights of the seed layer 2.95 to 17.05 cm and in different times of exposure ozone (17.7, 30, 60, 90 and 102.3 min) according to central composite rotatable design (CCRD). It was evaluated the effect of ozone on decontamination by fungi, moisture content and electric conductivity of sunn hemp seeds. Results of CCRD show different reductions of fungi and a second-order linear model was proposed (average absolute deviation 7.79% and R2=0.67). Fungi reduction (92.37%) was significantly higher in lower layers of the seed column and in longer ozone exposure times, values corresponding to 10 cm and 102.7 min, respectively. Results also showed that ozonation did not influence significantly electrical conductivity and moisture content of seeds (p-value<0.05). Thus, application of ozone can ensure maintenance of sunn hemp seeds in post-harvest without damaging your quality.

Ozone penetration in a column containing sunn hemp (Crotalaria spectabilis Roth) seeds and the effect on the quality