Ozone as an alternative fumigant for controlling Callosobruchus maculatus (F.) (Coleoptera: Chrysomelidae) in cowpea beans

Abreu, Artur Oliveira; Faroni, L. R. D.; Silva, Marcus V.; Sousa, Adalberto Hipólito de; Alencar, Ernandes Rodrigues de; Silva, Gutierres Nelson

doi:10.1016/j.jspr.2022.101969

Cited by 10 publications

(9 citation statements)

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“…All the input oxygen volume was converted into ozone, which effectively reacted with the product inside the hypobaric chamber. On the hand, in flow applications, some ozone reacts with the product, while the remaining flows freely through the grain mass, resulting in residual ozone, which must be either degraded or recirculated 26 . In the study by Silva et al ., 22 the authors compare the mass of ozone used per kilogram of popcorn kernels to control S. zeamais , and they found that the hypobaric chamber method required less ozone than the flowing‐gas application system.…”

Section: Discussionmentioning

confidence: 99%

“…This elevated rate is associated with the high values of the reaction rate constant of ozone gas with rice grains 49 . Grain reactivity determines the efficiency of ozone gas on insect‐pest mortality 18,26,75,83 . Little grain reactivity and long half life imply high concentrations of ozone in the intergranular space and, consequently, good efficiency in controlling insect pests 18 …”

Section: Discussionmentioning

confidence: 99%

“…On the hand, in flow applications, some ozone reacts with the product, while the remaining flows freely through the grain mass, resulting in residual ozone, which must be either degraded or recirculated. 26 In the study by Silva et al, 22 the authors compare the mass of ozone used per kilogram of popcorn kernels to control S. zeamais, and they found that the hypobaric chamber method required less ozone than the flowing-gas application system. In addition, the low-pressure injection system provided better operational safety, as the applications necessarily take place in hermetic chambers, and no residual ozone is generated.…”

Section: Discussionmentioning

confidence: 99%

“…49 Grain reactivity determines the efficiency of ozone gas on insect-pest mortality. 18,26,75,83 Little grain reactivity and long half life imply high concentrations of ozone in the intergranular space and, consequently, good efficiency in controlling insect pests. 18 Although the treatments in paddy rice and polished rice were only a little effective, the exposure time in this study was 172 min.…”

Section: Percentage Of Surviving Insectsmentioning

confidence: 99%

“…22 Several authors investigated the reaction kinetics of ozone when applied in flow to agricultural products in bulk, such as corn, nuts, beans, and rice. [23][24][25][26][27][28] Studies indicated that ozone decay depends on the chemical composition and physical properties of the grains. 29,30 However, few reports approached the application of ozone in low-pressure injection systems.…”

Section: Introductionmentioning

confidence: 99%

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Low‐pressure ozone injection system: relationship between reaction kinetics and physical properties of grains

et al. 2022

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BACKGROUND The ozonation of grains in a closed system at low pressure is a strategy with the potential for treating packaged products. Research is necessary to characterize the reaction kinetics of ozone in this type of injection system so that it is possible to design chambers and determine the ozone concentrations suitable for commercial‐scale applications. The objective of this study was therefore to characterize the low‐pressure ozone injection system in relation to the physical properties of the grains and determine possible changes in their quality. Samples (5 kg each) of common beans, cowpea beans, corn, popcorn kernels, paddy rice, and polished rice were exposed to ozone in a 70 L hypobaric chamber. Initially, the internal pressure of the chamber was reduced to 500 hPa. Then, ozone was injected at a concentration of 32.10 g m−3 at a volumetric flow rate of 1 L min−1 until reaching a pressure of 1000 hPa. To relate the decomposition of ozone to the grains that were being evaluated, different physical properties were determined, and quality analysis was conducted. RESULTS Ozone gas half‐life outside and inside the package depended on the grain type. Ozone decomposition was quickest in polished rice and slowest in common beans. The half‐life of the different grains ranged from 17.8 to 52.9 and 16.4 to 52.9 min, outside and inside the package, respectively. Considering the physical properties, specific surface (Ss), surface area (SA), and sphericity (φ) exhibited a significant correlation with the decomposition rate constant (k) of ozone. However, the variables volume (V), permeability (K), porosity (ε), and specific mass (ρ) showed no correlation with k. CONCLUSION The physical properties of grain influenced the reaction kinetics of ozone gas during the low‐pressure injection process. Ozone gas injection at low pressures did not alter the quality attributes of the grains under study. © 2022 Society of Chemical Industry.

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Section: Discussionmentioning

confidence: 99%