Abstract
The objective of this study was to evaluate the effect of a bioactive edible coating combined with a low γ-radiation dose or negative air ionization (NAI) with ozone on the microbiological quality of ready-to-eat cauliflowers. Results showed that each treatment alone was effective on Listeria innocua, Escherichia coli and mesophilic bacteria. After 7 d, treatment with γ-radiation reduced L. innocua and E. coli of 1.8 and 3.6 log CFU g−1 respectively while NAI+ozone reduced L. innocua and E. coli of 2.0 and 2.8 log CFU g−1 respectively. Mesophilic bacteria were reduced of 1.8 log CFU g−1 after γ-radiation and 1.4 log CFU g−1 after NAI+ozone. This study demonstrated that the bioactive coating acts in synergy with γ-radiation, inducing no bacterial growth of L. innocua and E. coli, as well as a control of the growth of mesophilic bacteria during 7 d. The combination of bioactive coating and NAI+ozone induced an additive effect on L. innocua, E. coli and mesophilic bacteria, and suggests potential antioxidant properties of the coating.
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