Department of Agri-food Industry, Food and Nutrition (LAN), Luiz de Queiroz College of Agriculture (ESALQ), University of São Paulo (USP), Piracicaba, Brazil.
School of Chemistry and Food, Federal University of Rio Grande, Rio Grande, Brazil.
J Sci Food Agric. 2019 Dec;99(15):6814-6821. doi: 10.1002/jsfa.9966. Epub 2019 Sep 4.
Maize is one of the most important cereals. It is used for different purposes and in different industries worldwide. This cereal is prone to contamination with mycotoxins, such as zearalenone (ZEN), which is produced mainly by Fusarium graminearum, F. culmorum and F. equiseti. Toxin production under highly moist conditions (aw > 0.95) is exacerbated if there are alternations between low temperatures (12-14 °C) and high temperatures (25-28 °C). Even if good production practices are adopted, mycotoxins can be found in several stages of the production chain. For this reason, an alternative to reducing this contamination is ozonation. This study evaluated the reduction of ZEN in naturally contaminated whole maize flour (WMF) treated with 51.5 mg L of ozone for up to 60 min. Pasting properties, peroxide value, and fatty acid composition were also evaluated.
Zearalenone degradation in ozonated WMF was described by a fractional first-order kinetic, with a maximum reduction of 62.3% and kinetic parameter of 0.201 min in the conditions that were evaluated. The ozonation process in WMF showed a decrease in the apparent viscosity, a decrease in the proportion of linoleic, oleic, and α-linolenic fatty acids, an increase in the proportion of palmitic acid, and an increase in the peroxide value.
Ozonation was effective in reducing ZEN contamination in WMF. However, it also modified the pasting properties, fatty acid profile, and peroxide value, affecting functional and technological aspects of WMF. © 2019 Society of Chemical Industry.
玉米是最重要的谷物之一。它在世界各地被用于不同的目的和不同的行业。这种谷物容易受到真菌毒素的污染，如玉米赤霉烯酮（ZEN），主要由禾谷镰刀菌、串珠镰刀菌和燕麦镰刀菌产生。在高湿度条件下（aw>0.95），如果温度在 12-14°C 和 25-28°C 之间交替，毒素的产生会加剧。即使采用了良好的生产实践，也可以在生产链的几个阶段发现真菌毒素。因此，减少这种污染的替代方法是臭氧处理。本研究评估了用 51.5 mg/L 臭氧处理自然污染的全玉米粉（WMF）长达 60 分钟对 ZEN 的减少。还评估了糊化特性、过氧化物值和脂肪酸组成。
用臭氧处理的 WMF 中 ZEN 的降解符合分数一级动力学，在评价的条件下，最大降解率为 62.3%，动力学参数为 0.201/min。WMF 中的臭氧处理过程表现为表观粘度降低，亚油酸、油酸和α-亚麻酸的比例降低，棕榈酸的比例增加，过氧化物值增加。
臭氧处理有效地降低了 WMF 中的 ZEN 污染。然而，它也改变了糊化特性、脂肪酸组成和过氧化物值，影响了 WMF 的功能和技术方面。© 2019 化学工业协会。
