Encontrados 13 documentos, a visualizar página 1 de 2
Determination of ochratoxin A in bread: evaluation of microwave-assisted extrac...
Paíga, Paula; Morais, Simone; Oliva-Teles, Maria Teresa; Correia, Manuela; Delerue-Matos, Cristina; Sousa, Ana M. M.; Gonçalves, Maria PilarAn analytical method using microwave-assisted extraction (MAE) and liquid chromatography (LC) with fluorescence detection (FD) for the determination of ochratoxin A (OTA) in bread samples is described. A 24 orthogonal composite design coupled with response surface methodology was used to study the influence of MAE parameters (extraction time, temperature, solvent volume, and stirring speed) in order to maximize...
Determination of ochratoxin A content in wheat bread samples collected from the...
Bento, J. M. V.; Pena, A.; Lino, C. M.; Pereira, J. A.http://www.sciencedirect.com/science/article/B6W6H-4TX33XB-1/2/609b7e7d0247810aab7cad1fae1f851b
Ochratoxin A exposure assessment of the inhabitants of Lisbon during winter 200...
Duarte, S. C.; Bento, J. M. V.; Pena, A.; Lino, C. M.A survey on the occurrence of ochratoxin A (OTA) in 41 bread samples was carried out in the Portuguese capital, Lisbon. Maize (5) and wheat bread (36) and 43 representative urine samples from the Lisbon region were assayed for OTA levels using immunoaffinity column cleanup (IAC) and HPLC with fluorimetric detection (LC-FD). The percentage of OTA-positive samples was slightly higher for maize bread (80%) than wh...
Ochratoxin A contamination of bread – Portugal nationwide survey during winter ...
Duarte, S.; Bento, J.M.V.; Pena, A.; Lino, C.M.; Pereira, J.A.; Delerue-Matos, C.; Oliva-Teles, T.; Morais, S.; Correia, M.; Oliveira, M.B.P.P.Ochratoxin A (OTA) remains one of the most important mycotoxins known, due to its ubiquitous occurrence, wide range of susceptible food commodities and observed toxic effects, in both animals and humans. The reported toxic effects include carcinogenic, nephrotoxic, teratogenic, neurotoxic and immunotoxic.
Ochratoxin A content in urine from Bragança and Alentejo: a compartive analysis...
Duarte, S.; Bento, J.M.V.; Pena, A.; Lino, C.M.; Pereira, J.A.; Delerue-Matos, C.; Oliva-Teles, T.; Morais, S.; Correia, M.; Oliveira, M.B.P.P.Ochratoxin A (OTA) is a mycotoxin which possesses a variety of toxic effects, including enzyme inhibition, immunosuppression, teratogenicity, nephrotoxicity, and carcinogenicity. It is produced by fungi for which foodstuffs such as beans, cereals, fruits, and seeds constitute an ideal growing media. It has proven itself at least partly resistant to food processing methods, meaning it is also present in derived ...
Ochratoxin A in the morning and afternoon portions of urine from Coimbra and Va...
Manique, R.; Pena, A.; Lino, C. M.; Moltó, J. C.; Mañes, J.The widespread contamination of foodstuffs and beverages by mycotoxins, such as ochratoxin A (OTA), has made the monitoring of human contamination levels essential. ; http://www.sciencedirect.com/science/article/B6TCS-4RY6WKJ-1/1/4c16511b1a2109e4107233b7f0e3b98f
Determination of ochratoxin A in organic and non-organic cereals and cereal pro...
Juan, C.; Moltó, J. C.; Lino, C. M.; Mañes, J.The objective of this work was to know the occurrence of OTA in organic and non-organic cereals and cereal products from Spain and Portugal. A method based on extraction with matrix solid phase dispersion (MSPD) using octylsilica (C8) followed by liquid chromatography coupled with fluorescence detection (LC-FD) was used to determine OTA from the selected samples. Recoveries of OTA from the studied samples spike...
Levels of ochratoxin A in serum from urban and rural Portuguese populations and...
Lino, C. M.; Baeta, M. L.; Henri, M.; Dinis, A. M. P.; Pena, A. S.; Silveira, M. I. N.Urban and rural population exposure to ochratoxin A (OTA) in central zone of Portugal was investigated in three places: Coimbra, Verride and Ereira. ; http://www.sciencedirect.com/science/article/B6T6P-4PYYTY1-6/1/d92ebdd35d9b9545c0b4cc338410924b
Determination of ochratoxin A in maize bread samples by LC with fluorescence de...
Juan, C.; Lino, C. M.; Pena, A.; Moltó, J. C.; Mañes, J.; Silveira, I.Ochratoxin A (OTA) is a secondary fungal metabolite produced by several moulds, mainly by Aspergillus ochraceus, A. carbonarius, A. niger and by Penicillium verrucosum. The present work shows the results of comparative studies using different procedures for the analysis of OTA in maize bread samples. The studied analytical methods involved extraction with different volumes of PBS/methanol, different extraction ...
Occurrence of fumonisins B1 and B2 in broa, typical Portuguese maize bread
Lino, C. M.; Silva, L. J. G.; Pena, A.; Fernández, M.; Mañes, J.Fumonisin B1 (FB1) and fumonisin B2 (FB2) are mycotoxins mainly produced by Fusarium verticillioides, and Fusarium proliferatum, fungi species most commonly isolated from maize. The natural occurrence of FB1 and FB2 in broa, typical Portuguese maize bread, was evaluated in 30 samples. Twenty five were found positive with levels ranging from 142 to 550 [mu]g kg- 1. The limit established by the European regulatio...
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