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Feizy J.,Testa Quality Control Laboratory
Mycotoxin research | Year: 2012

Forty samples of dried vine fruit (raisin, n = 22; currant, n = 18) were collected in 2009-2011 from the Iranian market. Aflatoxins (AFs) and ochratoxin A (OTA) were determined in these samples after immunoaffinity column clean-up by high performance liquid chromatography (HPLC) with fluorescence detection. The limit of quantification (LOQ) for AFs B1. B2, G1, G2, and OTA were 0.62, 0.50, 0.70, 0.40, and 0.42 ng/g, respectively. AFB1 was found in one sample of raisin (0.64 ng/g) and in two samples of currant (0.20 and 0.63 ng/g). AFB2 (0.33 ng/g) and AFG2 (0.49 ng/g) were found in 2 samples of currant. OTA was detected in 3 of the 22 samples of raisin (mean 2.21 ng/g) and in one sample of currant (2.99 ng/g). The results show that in AFs and OTA levels are well below the regulatory limits both of the European Union and of Iran. Source


Beheshti H.R.,Testa Quality Control Laboratory | Asadi M.,Testa Quality Control Laboratory
Food Additives and Contaminants: Part B Surveillance | Year: 2013

Ochratoxin A content in 100 grain and derived products were determined by high-performance liquid chromatography with immunoaffinity column clean-up and fluorometric detection. Ochratoxin A was detected in 32% of green gram, 13.3% of chickpea, 10% of lentil and 17.5% of wheat flour. Ochratoxin contamination was below the regulatory limits of the European Union and of Iran. Recovery was 97% and the limit of detection was 0.12 ng g-1. Copyright © 2013 Testa Quality Control Laboratory. Source


Beheshti H.R.,Testa Quality Control Laboratory | Asadi M.,Testa Quality Control Laboratory
Food Additives and Contaminants: Part B Surveillance | Year: 2013

Aflatoxin content of 173 sunflower and safflower seeds was determined by HPLC with immunoaffinity column (IAC) clean-up and fluorometric detection. Aflatoxin B1 contamination was found in 111 samples: in 8 of the sunflower seed samples (16%) at a mean level of 40.68 ng g-1 and in 103 safflower seed samples (83.7%) at a mean level of 2.81 ± 0.44 ng g-1. In 5 sunflower seed samples and 1 safflower seed sample, aflatoxin B1 levels were higher than the maximum levels of AFB1 under Iran regulations (5 ng g-1). Aflatoxin B1 levels in 5 sunflower and 2 safflower seed samples were higher than the European Union maximum limit (2 ng g-1). © 2013 Copyright Taylor and Francis Group, LLC. Source


Es'haghi Z.,Payame Noor University | Beheshti H.R.,Testa Quality Control Laboratory | Feizy J.,Payame Noor University | Feizy J.,Testa Quality Control Laboratory
Journal of Separation Science | Year: 2014

In this research, magnetic graphene nanoparticles were prepared and used as adsorbents for preconcentrating the aflatoxins in rice, wheat, and sesame samples. For this purpose, graphene was synthesized by Hummer's method. Magnetically modified graphene formed by the deposition of magnetite (Fe3O4) on graphene was used for the separation of aflatoxins B1, B2, G1, and G2 from the samples. The extractants were subsequently analyzed with high-performance liquid chromatography and fluorescence detection. Parameters affecting the efficiency of the method were thoroughly investigated. The measurements were done under the optimized conditions. For aflatoxins B1, B2, G1, and G2, limits of detection were 0.025, 0.05, 0.05, and 0.075 ng/g and limits of quantification were 0.083, 0.16, 0.16, and 0.23 ng/g, respectively. Accuracy was examined by the determination of the relative recovery of the aflatoxins. The relative recovery of aflatoxins B1, B2, G1, and G2 were quite satisfactory (between 64.38 and 122.21% for food samples). Relative standard deviations for within laboratory repeatability (n = 6) were in the range from 1.3 to 3.2. The application of this sorbent for the separation and concentration of the mentioned aflatoxins from food samples was examined. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Source


Beheshti H.R.,Testa Quality Control Laboratory | Asadi M.,Testa Quality Control Laboratory
Food Additives and Contaminants: Part B Surveillance | Year: 2014

One hundred and forty-six samples of animal feed (barley, n = 60; wheat bran, n = 22; wheat dry pulp, n = 29; and canola meal, n = 35) were collected in 2011 from Mashhad (Khorasan, Iran). Aflatoxins (AFs) were determined in these samples after immunoaffinity column clean-up by high-performance liquid chromatography (HPLC) with fluorescence detection. Aflatoxin B1 (AFB1) contamination was found in 28 samples: in five of the barley samples (8.3%) at a mean level of 0.48 μg·kg-1, in two wheat bran samples (9.0%) at a mean level of 0.88 μg·kg-1, in 10 wheat dry pulp samples (34.5%) at a mean level of 0.30 μg·kg-1 and in 11 canola meal samples (31.4%) at a mean level of 0.92 μg·kg-1. AFB1 levels were below the maximum levels of Iran regulations (5 μg·kg-1) and the EU maximum limit (5 μg·kg-1). © 2013 © 2013 Testa Quality Control Laboratory. Source

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