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Fusarium graminearum Colors and Deoxynivalenol Synthesis at Different Water Activity

1
Laboratory of Food Process Engineering, Graduate School of Agriculture, Hokkaido University, Sapporo, Hokkaido 060-0808, Japan
2
Department of Biological Sciences, Faculty of Sciences, Eduardo Mondlane University, Av. Julius Nyerere, 3453 Maputo, Mozambique
*
Author to whom correspondence should be addressed.
Received: 4 November 2018 / Revised: 11 December 2018 / Accepted: 21 December 2018 / Published: 23 December 2018
(This article belongs to the Section Food Microbiology)
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Abstract

Deoxynivalenol (DON) is a well-known mycotoxin, responsible for outbreaks of gastrointestinal disorders in Japan. Fusarium graminearum, a parasite of cereal crops, produces this toxin and this is one of the reasons why it is important to understand its metabolism. It is possible to predict the mold’s color change and the quantity of DON synthesized throughout its lifecycle. Furthermore, aw has been found to affect the amount of DON. This study aimed to analyze the potential of F. graminearum surface color as a predictor of DON concentration at aw = 0.94, 0.97, and 0.99. Thus, 36 specimens were incubated at 25 °C, 12 at each aw. After 4, 8, 12, and 16 days, three specimens from each aw were collected for color analysis and DON quantification. For color analysis, photos were taken and red, green and blue (RGB) channels were measured on ImageJ software. DON was quantified through liquid chromatography (HPLC). Color changes were only observed at aw = 0.99 because at lower aw the molds presented high growth of white mycelium. Yet, DON increased in all cases. It was only possible to relate the colors with DON concentration at aw = 0.99, where they presented inverse proportionality. View Full-Text
Keywords: Fusarium graminearum; deoxynivalenol; RGB; water activity Fusarium graminearum; deoxynivalenol; RGB; water activity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Cambaza, E.; Koseki, S.; Kawamura, S. Fusarium graminearum Colors and Deoxynivalenol Synthesis at Different Water Activity. Foods 2019, 8, 7.

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