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Ochratoxinogenicity of Aspergillus ochraceus strains from nephropathic and non-nephropathic areas in Yugoslavia

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Abstract

Mycological analyses of 855 samples of stored grains and dried meat collected in period 1980–1987 from individual households in the nephropathic and wider non-nephropathic area in SR Croatia in Yugoslavia showed 10% of samples to be contaminated with Aspergillus ochraceus. Ability to produce ochratoxin A (OA) was tested in 70 samples (27 from nephropathic areas and 43 from non-nephropathic areas). The detection was carried out under UV-light (365 nm) (light blue fluorescence) and 6 OA-producers were found.

A biosynthetic procedure on liquid nutritional substrate with sacharose and yeast extract as well as a method using wet crushed wheat revealed that 37% of the samples from a nephropathic area, and 35% of the samples from a non-nephropathic area produce OA.

In the nephropathic area 1/10 strains was a strong producer of OA (concentration crushed wheat 135 mg/kg, and 240 mg/l on YES liquid substrate), 1/10 strains was a moderate producer (concentration 16.6 mg/l and 0.07–7.0 mg/l and 0.1–10.4 mg/kg).

Among the strains isolated from a wider non-nephropathic area no strong producers of OA were found, but 2/15 strains were moderate producers of OA (concentration of OA 20.4–27.0 mg/l and 15.0–33.7 mg/kg). The other strains, 8/10 on the crushed wheat and 13/15 on the liquid substrate, were weak producers of OA with concentrations of OA between 0.2–9.0 mg/l and 0.2–10.0 mg/kg with the two methods respectively.

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  1. Department of Microbiology, Faculty of Pharmacy and Biochemistry, University of Zagreb, A. Kovačića 1, 41000, Zagreb, Yugoslavia

    Zdenka Cvetnić & Stjepan Pepeljnjak

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  1. Zdenka Cvetnić
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  2. Stjepan Pepeljnjak
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Cvetnić, Z., Pepeljnjak, S. Ochratoxinogenicity of Aspergillus ochraceus strains from nephropathic and non-nephropathic areas in Yugoslavia. Mycopathologia 110, 93–99 (1990). https://doi.org/10.1007/BF00446997

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