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Vidal N.,National Institute for Quality Control in Health INCQS | Vidal N.,National University of Science and Technology | Barbosa H.,University of Campinas | Barbosa H.,National University of Science and Technology | And 3 more authors.
Food Chemistry | Year: 2015

Genetically modified foods are a major concern around the world due to the lack of information concerning their safety and health effects. This work evaluates differences, at the proteomic level, between two types of crop samples: transgenic (MON810 event with the Cry1Ab gene, which confers resistance to insects) and non-transgenic maize flour commercialized in Brazil. The 2-D DIGE technique revealed 99 differentially expressed spots, which were collected in 2-D PAGE gels and identified via mass spectrometry (nESI-QTOF MS/MS). The abundance of protein differences between the transgenic and non-transgenic samples could arise from genetic modification or as a result of an environmental influence pertaining to the commercial sample. The major functional category of proteins identified was related to disease/defense and, although differences were observed between samples, no toxins or allergenic proteins were found. © 2015 Elsevier Ltd. All rights reserved. Source

Simpson-Louredo L.,State University of Rio de Janeiro | Simpson-Louredo L.,National Institute for Quality Control in Health INCQS | Ramos J.N.,State University of Rio de Janeiro | Ramos J.N.,National Institute for Quality Control in Health INCQS | And 9 more authors.
Antonie van Leeuwenhoek, International Journal of General and Molecular Microbiology | Year: 2014

Corynebacterium ulcerans has been increasingly isolated as an emerging zoonotic agent of diphtheria and other infections from companion animals. Since pets are able to act as symptomless carriers, it is also essential to identify virulence potential for humans of these isolates. In this work the ability of C. ulcerans to bind to fibrinogen (Fbg), fibronectin (Fn) and Type I collagen as well the genetic relationship among strains isolated from human and asymptomatic dogs in Rio de Janeiro (Brazil) were analyzed. Five pulsed-field gel electrophoresis (PFGE) profiles were demonstrated (I, II, III, IV and V). In addition, the IV and V profiles exhibiting ≥85 % similarity were expressed by the BR-AD41 and BR-AD61 strains from companion dogs living in the same neighborhood. Independent of the PFGE-types, human and dog isolates showed affinity to Fbg, Fn and collagen. Heterogeneity of PFGE profiles indicated endemicity of C. ulcerans in the Rio de Janeiro metropolitan area. Differences in the expression of adhesins to the human extracellular matrix may contribute to variations in the virulence and zoonotic potential of C. ulcerans strains. © 2013 Springer Science+Business Media Dordrecht. Source

Branquinho M.R.,National Institute for Quality Control in Health INCQS | Ferreira R.T.B.,National Institute for Quality Control in Health INCQS | Cardarelli-Leite P.,National Institute for Quality Control in Health INCQS
Journal of Food Composition and Analysis | Year: 2010

Analysis of food products consisting of, or produced from, genetically modified organisms (GMOs) is required to verify compliance with labeling legislation and to detect any possible unauthorized transgenic crops. With these goals, 240 samples of soy-derived foodstuffs and 25 samples of maize-derived foodstuffs were analyzed from 2004 to 2007. All samples positive for Roundup Ready® soybean were quantitatively examined using the TaqMan® GMO 35S Soy kit. In food containing soy, 68 (28.3%) were shown to contain GM soy, whereas in food containing maize, neither Bt 176 nor MON 810 maize were found. Quantitative analysis revealed GMO contents ranging from 0.05 to 1% in 43 (63.2%) samples, and more than 1% in 25 (36.8%) samples. The absolute and relative limits of detection (LODs) were approximately 10 copies and 0.0125%, respectively, and the absolute and relative limits of quantification (LOQs) were approximately 40 copies and 0.05%, respectively, suggesting sufficient sensitivity to quantify genetically modified (GM) materials below and above the legal threshold of 1%. The presence of GM material in these samples was not indicated on their labels, indicating that none of these food products had been appropriately labeled. These results clearly demonstrate the need for a monitoring program of food products by the Brazilian regulatory authorities. © 2010 Elsevier Inc. All rights reserved. Source

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