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Implication of pre-drying steps with natural fumonisin contamination levels in freshly harvested corn

in World Mycotoxin Journal
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E. Ono Department of Biochemistry and Biotechnology, State University of Londrina, P.O. Box 6001, 86051-980 Londrina, Paraná, Brazil

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M. Silva Department of Biochemistry and Biotechnology, State University of Londrina, P.O. Box 6001, 86051-980 Londrina, Paraná, Brazil

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M. Ono Department of Pathological Sciences, State University of Londrina, P.O. Box 6001, 86051-980 Londrina, Paraná, Brazil

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E. Vizoni Department of Applied Mathematics, State University of Londrina, P.O. Box 6001, 86051-980 Londrina, Paraná, Brazil

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G. Garcia Integrada Agroindustrial Cooperative, 86380-000 Andirá, Paraná, Brazil

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O. Kawamura Faculty of Agriculture, Department of Biochemistry and Food Science, Kagawa University, Ikenobe, Miki-cho, Kita-gun, 761-0765 Kagawa, Japan

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M. Sabino Instituto Adolfo Lutz, 01246-902 São Paulo, SP, Brazil

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Y. Sugiura Department of Food Chemistry, Kobe Institute of Health, 4-6 Minatojima-nakamachi, Chuo-ku, Kobe 650-0046, Japan

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E. Hirooka Department of Food Science and Technology, State University of Londrina, P.O. Box 6001, 86051-980 Londrina, Paraná, Brazil

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Maize quality regarding fumonisin contamination of 390 freshly harvested samples used by maize processing industries in the Northern region of Parana State, Brazil (2003 crop) was evaluated and correlated to the time elapsed from harvesting to the pre-drying step. Sampling was carried out at three points of the maize production chain, immediately after harvesting (n=100), at the industry delivery posts (n=200) and before the drying process (n=90). Fumonisin B1 (FB1) was detected in all the samples from the three points of the maize production chain. FB1 levels ranged from 0.11 to 12.68 µg/g (mean 1.81±2.12 µg/g) in the field samples, 0.10 to 11.83 µg/g (mean 1.83±1.75 µg/g) in the reception samples and from 0.02 to 10.98 µg/g (mean 2.31±2.38 µg/g) in the pre-drying samples. FB2 levels ranged from 0.01 to 5.26 µg/g (mean 0.84±0.94 µg/g) in the field samples, from 0.02 to 5.25 µg/g (mean 0.74±0.69 µg/g) in the reception samples and from 0.07 to 7.89 µg/g (mean 1.25±1.29 µg/g) in the pre-drying samples. Although there was no significant difference in mean fumonisin levels among the field, reception and pre-drying samples by the Tukey multiple comparison test (P<0.05), there was a positive correlation (P<0.05) between fumonisin levels and the time elapsed (p=0.95) from harvesting to the pre-drying step. Therefore reduction in the harvest/drying interval would be essential to assure product quality and safety and minimise potential health hazards.

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