Resistência de quatro genótipos de amendoim à produção de aflatoxina B1 após inoculação com Aspergillus flavus Link

Prado, Guilherme; Oliveira, M. S.; Gazzinelli-Madeira, Jovita Eugenia; Godoy, Ignácio José de; Corrêa, Benedito; Junqueira, Roberto Gonçalves; Ferreira, Solange Oliveira

doi:10.1590/s0101-20611999000100015

Cited by 8 publications

(7 citation statements)

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“…AFB1 production of four genotypes of peanuts (including the most planted in Brazil), inoculated with A. flavus IMI 190443, was also investigated by Prado et al (89,99). The genotype 2117, originating from India, presented the lowest AFB1 levels, indicating varietal resistance as a possible means of control.…”

Section: Prevention Control and Effects Of Processingmentioning

confidence: 99%

Mycotoxin research in Brazil: the last decade in review

Rodriguez–Amaya

Sabino

2002

Braz. J. Microbiol.

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The number of research papers (128 papers) on mycotoxins published by Brazilian researchers in 1991-2000 surpassed the total number (85 papers) published in the preceding three decades . Thirty percent of the papers surveyed mycotoxins in foods and feeds. AFs in peanut and peanut products continued to be alarming, and high incidence and levels of FBs in corn and corn products also appeared as a serious problem. Contamination with other toxins, such as ZEA, OTA and trichothecenes, was low. Occurrence of AFM 1 in milk and dairy products and patulin in apple juice needs to be verified as the results are somewhat diverging. Work on analytical methods, mycological examination and toxic effects constituted 16, 13 and 13%, respectively, of the published papers in the decade assessed. Attempts to find means of preventing/controlling fungal growth and mycotoxin production notably increased, making up 27% of the papers, including investigations on influencing factors (e.g. genotype resistance, water content/a w , relative humidity, temperature, presence of metals, type of soil, mite infestation) and antagonistic potential of other microorganisms against mycotoxin-producing fungi. Effects of plant extract, flavonoids, fungicides and other chemicals, storage bag material, adsorbents, cooking and processing of food were also studied. Thus, notwithstanding constraints on resources, Brazilian research responds to the needs of the country, reflects international concerns and recent developments in the area.

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Section: Prevention Control and Effects Of Processingmentioning

confidence: 99%

Mycotoxin research in Brazil: the last decade in review

Rodriguez–Amaya

Sabino

2002

Braz. J. Microbiol.

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“…According to CHIOU (1997), fungal infection of peanuts is a matter of great concern for food producers and consumers because of the resultant quality decay and production of aflatoxins. Aflatoxins exert direct influence on the quality of peanut and its derivatives consumed by both people and animals (PRADO et al, 1999). Of the various types of mycotoxins, aflatoxins stand out as presenting high acute and chronic toxicity in animals, including human beings; they can also cause liver damage, such as cirrhosis and hepatocellular carcinoma, in addition to teratogenic effects (ABDULKADAR et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Decomposition kinetics of gaseous ozone in peanuts

Alencar

Faroni²,

Martins³

et al. 2011

Eng. Agríc.

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This study was conducted to evaluate the decomposition kinetics of gaseous ozone in peanut grains. This evaluation was made with 1-kg peanut samples, moisture contents being 7.1 and 10.5% wet basis (w.b.), placed in 3-liter glass containers. The peanut grains were ozonated at the concentration of 450 µg L -1 , at 25 and 35 ºC, with gas flow rates of 1.0 and 3.0 L min -1 . Time of saturation was determined by quantifying the residual concentration of ozone after the gas passed through the grains to constant mass. The decomposition kinetics of ozone was evaluated after the grain mass was ozone-saturated. For the peanut grains whose moisture content was 7.1% (w.b.), at 25 and 35ºC and with flow rates of 1.0 and 3.0 L min -1 , the values obtained for time of saturation of gaseous ozone ranged between 173 and 192 min; the concentration of saturation was approximately 260 µg L -1 . For the grains whose moisture content was 10.5% (w.b.), a higher residual concentration of gaseous ozone was obtained at 25 ºC, that of 190 µg L -1 . As regards the half-life of ozone, the highest value obtained was equivalent to 7.7 min for grains ozonated at 25 ºC, while for those with moisture content of 10.5% at 35 ºC, half-life was 3.2 min. In the process of ozone decomposition in peanut grains, temperature was concluded to be the key factor. An increase of 10 ºC in the temperature of the grains results in a decrease of at least 43% in the half-life of ozone.KEYWORDS: concentration of saturation, time of saturation, half-life. CINÉTICA DA DECOMPOSIÇÃO DO GÁS OZÔNIO EM AMENDOIMRESUMO: Este trabalho foi desenvolvido com o objetivo de avaliar a cinética de decomposição do ozônio em grãos de amendoim. Para avaliar a cinética de decomposição do gás, utilizaram-se amostras de 1 kg de amendoim, com teores de água de 7,1 e 10,5% base úmida (b.u.), acondicionadas em recipientes de vidro com capacidade de 3 L. Os grãos de amendoim foram ozonizados na concentração de 450 µg L -1 , nas temperaturas de 25 e 35 ºC, e vazões do gás de 1,0 e 3,0 L min -1 . Determinou-se o tempo de saturação, quantificando-se a concentração residual do ozônio após a passagem do gás pela massa de grãos, até que a mesma se mantivesse constante. A cinética de decomposição foi avaliada depois da saturação da massa de grãos com o gás. Nessa etapa, obteve-se a concentração residual do ozônio, depois de períodos de repouso, durante os quais o gás reagia no meio poroso, e dessa forma, era decomposto. Um modelo cinético de primeira ordem foi ajustado aos dados da concentração residual em função do tempo, após linearização. A partir dos valores da constante da taxa de decomposição, definida como a inclinação da reta referente ao modelo cinético de primeira ordem linearizado, foi possível obter a meia-vida do ozônio em grãos de amendoim. Para os grãos de amendoim com teor de água de 7,1% (b.u.), nas temperaturas de 25 e 35 °C, e vazões de 1,0 e 3,0 L min -1 , os valores obtidos de tempo de saturação do gás permaneceram na faixa entre 173 e 192 min, com concentração de s...

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“…Também Vasedeva et al (1989) comentaram que, em relação ao tegumento, deve-se considerar os fatores específicos que estão associados, tais como, uniformidade da camada cerosa, presença de taninos, compostos inibidores, acúmulo de cera na superfície, entre outros. Prado et al (1999) ressaltaram ainda, que além do conhecimento dos mecanismos indutores de resistência, é necessário considerar as variações em função do isolado de A. flavus utilizado, seu potencial infectivo, o processo de inoculação, bem como também das condições de cultivo e colheita dos frutos a serem analisados (Usberti & Amaral, 1999).…”

Section: Introductionunclassified

Contaminação de sementes de amendoim, inoculadas por Aspergillus secção Flavi, influenciada pelo genótipo, pela área de cultivo e pelos isolados

2010

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RESUMOO amendoim pode ser contaminado por Aspergillus secção Flavi no solo, antes da colheita, como após a colheita, na secagem e no armazenamento. O crescimento desses fungos pode reduzir a germinação e causar morte do embrião. Objetivou-se, neste trabalho, avaliar a contaminação das sementes de amendoim inoculadas por A. secção Flavi, sob influência de diferentes genótipos produzidos em áreas de cultivo com e sem calagem e de distintos isolados utilizados. O delineamento experimental utilizado foi o inteiramente casualizado, em esquema fatorial: 3 (genótipos: IAC 22, BR 1 e Caiapó) x 4 (tratamentos: sem inoculação e três isolados de A. secção Flavi) x 2 (áreas de cultivo: com e sem calagem), com quatro repetições. A. secção Flavi não reduziu a porcentagem de plântulas normais sadias provenientes de sementes inoculadas dos diferentes genótipos de amendoim. As sementes de amendoim do genótipo IAC 22, produzidas em área com calagem promoveram a obtenção de menor porcentagem de plântulas anormais deterioradas. Termos para indexação:Arachis hypogaea L., calagem, sanidade, viabilidade. ABSTRACTPeanut can be contaminated by Aspergillus section Flavi in the soil before harvest and during drying and storage. The growth of this fungus can reduce germination and cause the death of the embryo. The objective of this work was to evaluate the contamination in peanut seeds inoculated with A. section Flavi influence by genotype, cultivated area and isolate. The experimental design was a 3 (genotypes: IAC 22, BR 1 and Caiapó) x 4 (treatments: without inoculation and three isolates of A. section Flavi) x 2 (cultivated areas: with or without liming) factorial, with four replicates, in a completely randomized experimental design. A. section Flavi did not reduce the percentage of healthy normal seedlings originated from the inoculated seeds of the different peanut types. Peanut seeds of genotype IAC 22 that were produced in an area with liming generated a smaller amount of abnormal seedlings.

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Resistência de quatro genótipos de amendoim à produção de aflatoxina B1 após inoculação com Aspergillus flavus Link

Cited by 8 publications

References 0 publications

Mycotoxin research in Brazil: the last decade in review

Mycotoxin research in Brazil: the last decade in review

Decomposition kinetics of gaseous ozone in peanuts

Contaminação de sementes de amendoim, inoculadas por Aspergillus secção Flavi, influenciada pelo genótipo, pela área de cultivo e pelos isolados

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