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Master's Dissertation
DOI
https://doi.org/10.11606/D.42.2014.tde-27062014-155824
Document
Author
Full name
Cynara Baltazar Barbosa
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2014
Supervisor
Committee
Correa, Benedito (President)
Ishida, Kelly
Sabino, Myrna
Title in Portuguese
Micoflora e ocorrência de micotoxinas em grãos de trigo recém-colhidos e armazenados.
Keywords in Portuguese
Alternaria spp.
Fusarium spp.
Alternariol
Deoxinivalenol
LC-MS/MS
Micobiota
Trigo
Zearalenona
Abstract in Portuguese
O presente estudo objetivou avaliar a microbiota fúngica e a ocorrência de micotoxinas por Cromatografia Líquida de Alta Eficiência acoplada à Espectrometria de Massas em amostras de grãos de trigo recém-colhidas e armazenadas. Os resultados revelaram a predominância do gênero Alternaria nas amostras de todas as coletas, seguido de Epicoccum (12,6%), Fusarium (8,3%) e mais 16 outros gêneros de fungos filamentosos. As espécies de Fusarium e Alternaria foram identificadas utilizando métodos moleculares, sendo F. graminearum e A. alternata as espécies mais frequentes. De 70 amostras, 69 (98,6%) estavam contaminadas com a toxina DON (210-2910 ppb) e 3 (4,3%) amostras contaminadas com a toxina ZEA (20-30,1 ppb). O nível de contaminação por DON é inferior aos limites estabelecidos recentemente pela legislação brasileira (3000 ppb), porém superam os limites da Comunidade Européia (1750 ppb). É prudente que se realize um monitoramento contínuo de grãos de trigo a fim de avaliar a exposição dos consumidores às contaminações e estabelecer diretrizes de segurança alimentar.
Title in English
Mycoflora and occurrence of mycotoxins in grains of wheat freshly harvested and stored.
Keywords in English
Alternaria spp.
Fusarium spp.
Alternariol
Deoxynivalenol
LC-MS/MS
Mycoflora
Wheat
Zearalenone
Abstract in English
The present study aimed to evaluated the mycoflora and occurrence of mycotoxins by high performance liquid chromatography coupled to tandem mass in freshly harvested and stored wheat samples. The results showed the predominance of genus Alternaria in all samples, followed by Epicoccum (12.6%), Fusarium (8.3%) and over 16 other genera of filamentous fungi. The species of Fusarium and Alternaria were identified using molecular methods, and F. graminearum and A. alternata were the most frequent species. Of 70 samples, 69 (98.6%) were contaminated with toxin DON (210-2910 ppb), and 3 (4.3%) samples contaminated with the toxin ZEA (20-30.1 ppb). The level of DON contamination is below of the limits recently established by Brazilian legislation (3000 ppb), but exceed the limits of the European Community (1750 ppb). It is prudent to perform a continuous monitoring of wheat to assess consumer exposure to contaminants and establish guidelines for food safety.
 
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Publishing Date
2014-07-02
 
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