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Micotoxinas em gr?os de trigo: ocorr?ncia, efeitos da ozoniza??o e determina??o de uma forma modificada do desoxinivalenol / Mycotoxins in wheat grains: Occurrence, effects of ozonation and determination of a modified form of deoxynivalenol

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Previous issue date: 2016-03-18 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Mycotoxins are natural contaminants produced by filamentous fungi and they are widely present in food. In wheat grains, the presence of trichothecenes produced by Fusarium spp. and also aflatoxins, produced by Aspergillus spp. are a serious public health problem because they are toxic metabolites to man and animals that remain stable during the industrial processes to which wheat is subjected when manufacturing derived products. One way to reduce such contaminants is to use ozone (O3) in food processing. Due to its high potential as an oxidant, O3 may react with mycotoxins and reduce their toxicity due to molecular degradation. This research aimed to evaluate the effects of different conditions of ozonation on the i) reduction in mycotoxins levels (deoxynivalenol and total aflatoxins); ii): reduction in total fungal count; iii) the effects on chemical, mineral and technological profiles and; iv) the possible differences sensorial profile of the flour obtained from the ozonized grains. In a second phase of this project, a methodology for determination of D3G (deoxynivalenol-3-glucoside), a masked form of DON, using High Performance Liquid Chromatography with photodiode array detector (HPLC-PDA) was optimized and in-house validated. Results obtained from ozonation study showed that O3 reduced total fungal count in approximately 3.0 cycles log CFU/g of wheat grain and deoxynivalenol and total aflatoxins contamination up to 64.3% and 48.0%, respectively. The gaseous ozonation can be applied without negatively changing the chemical, technological and sensory characteristics of the grains and can be considered an excellent method for remediation of fungal and mycotoxin contaminations. Also, the method optimized and in-house validated for determination of D3G by HPLC-PDA showed adequate results and, it could be considered an alternative to mass spectrometry determination of D3G in wheat grains. / Micotoxinas s?o contaminantes naturais, produzidos por fungos filamentosos e, podem ocorrer em altos n?veis nos alimentos. Nos gr?os de trigo, a presen?a de tricotecenos, um grupo de micotoxinas produzidas por Fusarium spp. e, aflatoxinas, produzidas por Aspergillus spp., representam um importante problema de sa?de p?blica por serem t?xicas ao homem e animais e muito est?veis aos processos no qual o trigo ? submetido para obten??o de produtos industrializados. Uma forma de reduzir a contamina??o dos alimentos por micotoxinas ? atrav?s do uso do oz?nio (O3) no processamento do alimento. Devido ao alto potencial oxidante do O3, esse pode degradar as mol?culas das micotoxinas, tendo como consequ?ncia a elimina??o ou redu??o de seus efeitos t?xicos. Essa pesquisa teve como objetivos principais avaliar os efeitos de diferentes condi??es de ozoniza??o na i) redu??o de micotoxinas (desoxinivalenol e aflatoxinas) em gr?os de trigo; ii) redu??o nos n?veis de fungos filamentosos; iii) influ?ncia nos par?metros qu?micos, perfil de minerais e par?metros tecnol?gico dos gr?os e da farinha obtida ap?s o processamento e; iv) influ?ncia nas caracter?sticas sensoriais da farinha elaborada a partir dos gr?os ozonizados. Em uma segunda etapa do projeto, um m?todo para determina??o de uma forma modificada do desoxinivalenol (DON), o desoxinivalenol-3-glicos?deo (D3G) foi otimizada e validada intralaboratorialmente, utilizando cromatografia l?quida de alta efici?ncia com detector de arranjo de diodos (CLAE-DAD). Os resultados obtidos dos ensaios de ozoniza??o demonstraram que o O3, nas condi??es experimentais utilizadas, reduziu a contagem de fungos totais em cerca 3,0 logs UFC/g de gr?os e a contamina??o por desoxinivalenol e aflatoxinas totais em at? 64,3 % e 48,0 %, respectivamente. O processo de ozoniza??o n?o influenciou de modo negativo a qualidade qu?mica, tecnol?gica e sensorial dos gr?os de trigo, podendo ser utilizado como um excelente m?todo para remedia??o da contamina??o dos gr?os por fungos e micotoxinas. Resultados adequados tamb?m foram obtidos na valida??o do m?todo de determina??o de D3G por CLAE-DAD, demonstrando que o m?todo ? confi?vel para a determina??o dessa forma mascarada do DON em gr?os e trigo e, pode ser utilizado como um m?todo alternativo a espectrometria de massas para tal an?lise.

Identiferoai:union.ndltd.org:IBICT/oai:localhost:jspui/1354
Date18 March 2016
CreatorsTrombete, Felipe Machado
ContributorsFraga, Marcelo Elias, Saldanha, Tatiana, Freitas-Silva, Otniel, Cust?dio, Fl?via Beatriz, Gamalho, Ormindo Domingues, Cruz, Luiz Celso Hygino da
PublisherUniversidade Federal Rural do Rio de Janeiro, Programa de P?s-Gradua??o em Ci?ncia e Tecnologia de Alimentos, UFRRJ, Brasil, Instituto de Tecnologia
Source SetsIBICT Brazilian ETDs
LanguagePortuguese
Detected LanguageEnglish
Typeinfo:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis
Formatapplication/pdf
Sourcereponame:Biblioteca Digital de Teses e Dissertações da UFRRJ, instname:Universidade Federal Rural do Rio de Janeiro, instacron:UFRRJ
Rightsinfo:eu-repo/semantics/openAccess
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