Antifungal activity and inhibition of aflatoxins production by Zingiber officinale Roscoe essential oil against Aspergillus flavus in stored maize grains/Atividade antifungica e inibicao da producao de aflatoxinas pelo oleo essencial de Zingiber officinale Roscoe contra Aspergillus flavus em graos de milho armazenados

Essential oils are possible alternatives to the use of synthetic pesticides for control of fungal contamination. Ginger (Zingiber officinale) essential oil (GEO) is known for having antifungal and antiaflatoxigenic properties, but its use as a fumigant in situ has not been studied yet. The aim of th...

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Published inCiência rural Vol. 50; no. 6
Main Authors Nerilo, Samuel Botiao, Romoli, Jessica Cristina Zoratto, Nakasugi, Lydiana Polis, Zampieri, Natana Souza, Mossini, Simone Aparecida Galerani, Rocha, Gustavo Henrique Oliveira, Gloria, Eduardo Micotti da, Filho, Benicio Alves de Abreu, Machinski, Miguel, Jr
Format Journal Article
LanguageEnglish
Published Universidade Federal de Santa Maria 01.06.2020
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Summary:Essential oils are possible alternatives to the use of synthetic pesticides for control of fungal contamination. Ginger (Zingiber officinale) essential oil (GEO) is known for having antifungal and antiaflatoxigenic properties, but its use as a fumigant in situ has not been studied yet. The aim of this study was to evaluate GEO's effects upon Aspergillus flavus as a fumigant agent in stored maize grains. The main compounds reported in GEO were [alpha]-zingiberene (23.85%) and geranial (14.16%), characterized by gas chromatography-mass spectrometry and nuclear magnetic resonance. The GEO was used as a fumigant in irradiated maize grains in concentrations ranging from 5 to 50 [micro]g/g and the resulting effects were compared to a synthetic antifungal agent (carbendazim and thiram), an antifungal traditionally used for seed treatment. The antifungal efficacy of GEO against A. flavus has been proven in a dose-dependent manner through in situ (maize grains) test. The GEO inhibited aflatoxin production at concentrations 25 and 50 [micro]g/g and controlled fungal growth. Therefore, GEO can be used as an effective and non-toxic alternative to conventional treatments in stored maize grains for the natural control of A. flavus. Key words: aflatoxins, posthaverst, fumigants, maize, essential oils. Os oleos essenciais sao possiveis alternativas ao uso de praguicidas sinteticos no controle da contaminacao por fungos. O oleo essencial de gengibre (Zingiber officinale--OEG) e conhecido por possuir propriedades antifungicas e antiaflatoxigenicas, mas seu uso como fumigante in situ ainda nao foi estudado. O objetivo deste estudo foi avaliar os efeitos do OEG sobre Aspergillus flavus como agente fumigante em graos de milho armazenados. Os principais compostos encontrados no OEG foram [alpha]-zingibereno (23,85%) e geranial (14,16%), caracterizados por cromatografia gasosa acoplada a espectrometria de massas e ressonancia magnetica nuclear. O OEG foi utilizado como fumigante em graos de milho irradiados em concentracoes variando de 5 a 50 [micro]g/g e os efeitos resultantes foram comparados a um agente antifungico sintetico (carbendazim e tiram), antifungico tradicionalmente usado para o tratamento de sementes. A eficacia antifungica do OEG contra A. flavus foi comprovada de maneira dependente da dose atraves do teste in situ (graos de milho). O OEG inibiu a producao de aflatoxina nas concentracoes 25 e 50 [micro]g/g e controlou o crescimento de fungos. Portanto, o OEG pode ser usado como uma alternativa eficaz e nao toxica aos tratamentos convencionais em graos de milho armazenados para o controle natural de A. flavus. Palavras-chave: aflatoxinas, pos-colheita, fumigantes, milho, oleos essenciais.
ISSN:0103-8478
1678-4596
DOI:10.1590/0103-8478cr20190779