Advances in ozone technology for preservation of grains and end products: Application techniques, control of microbial contaminants, mitigation of mycotoxins, impact on quality, and regulatory approvals
Eugénio da Piedade Edmundo Sitoe, Flaviana Coelho Pacheco, Florentina Domingos Chilala
Abstract
Ozone has emerged as a promising technology for preserving stored grains and end products. Its efficiency as a biocide and the absence of residues make it an attractive alternative to traditional chemical methods of food preservation. This study reviews recent advancements in ozone application techniques, including continuous flow treatments, closed-loop recirculation systems, and low-pressure application systems, as well as their impact on product quality. The study also examines the mechanisms of ozone action, its half-life in grain storage environments, and methods to ensure uniform gas distribution. The results of this study provide a foundation for understanding ozone reactions in various grain types and application systems, offering essential information for effectively sizing treatment systems, estimating ozone concentrations over time, and determining the quantity of products to be treated. A thorough comprehension of ozone behavior in porous environments, such as silos, and its stability under diverse environmental conditions is crucial for enhancing its applicability. While scientific evidence supports ozone's efficacy in controlling pests and microorganisms, further investigation is needed on its impact on the nutritional quality of grains and final products. Additionally, the review highlights the latest regulatory approvals for ozone use in the food industry, emphasizing the importance of compliance and safety. The findings underscore the need for continued technological development and economic analysis to evaluate the long-term viability of ozone applications in agriculture.