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Kindahl, H.; Cort, N.; Fredriksson, G.; Edqvist, L.E.; Stabenfeldt, G.
Nuclear and related techniques in animal production and health1986
Nuclear and related techniques in animal production and health1986
AbstractAbstract
[en] Intravenous infusion of endotoxins causes a rapid and pronounced release of prostaglandin F2α in the mare, cow, goat and sow. In the doe a marked relationship exists between the dose of endotoxin administered and the amount of prostaglandin released. Endotoxin-mediated prostaglandin release can affect luteal function, causing shortening of the oestrous cycle or abortion in pregnant animals. (author)
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Source
International Atomic Energy Agency, Vienna (Austria); Food and Agriculture Organization of the United Nations, Rome (Italy); Proceedings series; 696 p; ISBN 92-0-010286-7;
; 1986; p. 263-274; IAEA; Vienna (Austria); International symposium on the use of nuclear techniques in studies of animal production and health in different environments; Vienna (Austria); 17-21 Mar 1986; IAEA-SM--292/33; 19 refs, 8 figs.

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AbstractAbstract
[en] In aflatoxin radioimmunoassay the following indicators are determined: total radioactivity of the sample, proportion of specific bond, proportion of nonspecific bond, formal detection threshold, specific bond inhibition. The calculation method is given for each indicator. The plotting is designed of calibration dependence of the determination of values of reference samples and accuracy is discussed. The paper is oriented to the fundamentals of processing and the evaluation of results. (M.D.)
Original Title
Zpracovani vysledku radioimunologickeho stanoveni aflatoxinu
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[en] Methods for preparation of labelled ochratoxin A and B are described. The method for preparation of labelled ochratoxin B involves the synthesis of the azide of ochratoxin β via the mixed anhydride and subsequent conjugation to labelled phenylalanine to yield 14C-ochratoxin B. The labelled ochratoxins were injected into male Wistar rats and after different survival times they were sacrificed and subjected to whole body autoradiography. The distribution pattern of ochratoxin A in the rat did not differ from that earlier registered for mouse. The previously known, high susceptibility of rats (and not mice) to ochratoxin A-induced cancer could thus not be explained by an accumulation of the toxin in specific cells or organs. The distribution patterns of ochratoxin A and B were almost congruent - the only apparent difference being a much longer retention of the labelled ochratoxin A in the blood compared to ochratoxin B, which was much faster excreted. When analyzing tissue extract for labelled metabolites only the extracts from the rats injected with ochratoxin B were found to contain easily detectable concentrations, while no metabolites of ochratoxin A were seen. (au)
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[en] Abstract only
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South African Society of Radiation Therapists (South Africa); 53 p; 1986; p. 9; 10. National congress of the South African Society of Radiation Therapists; Sandton (South Africa); 13-15 Aug 1986
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Miscellaneous
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AbstractAbstract
[en] Cross-reactions and resulting nonspecific binding of substances with structures resembling aflatoxins (derivatives of coumarin, and cinnamonic and benzoic acids, etc.) were investigated. The concentrations of these substances causing erroneously high or false positive values in radioimmunoassay were determined. One μg aflatoxin B1/kg sample may be simulated by the occurrence of 5 g coumarin, 10 g caffeic acid, 16 g chlorogenic acid, or 15 g vanillin/kg fodder or food sample
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Journal of the Association of Official Analytical Chemists; ISSN 0004-5756;
; CODEN JANCA; v. 71(3); p. 491-493

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[en] Aspergillus flavus was grown on maize and rice extract agars and on irradiated viable cracked maize and rice grains, either in pure culture or in dual culture with wild strains of either Hyphopichia burtonii or Bacillus amyloliquefaciens. Aflatoxin production by A. flavus and its growth and interactions with the other microorganisms were studied at three water activities (a/sub w/) (0.98, 0.95, and 0.90) and two temperatures (25 and 160C). Both H. burtonii and B. amyloliquefaciens markedly stimulated growth and aflotoxin production by A. flavus on cracked maize, especially at 250C and 0.95 and 0.98 a/sub w/. No aflatoxin was detected in pure cultures of A. flavus on cracked rice after 12 days of incubation at 250C, but some was produced by mixed cultures at 160C and 0.98 a/sub w/. The morphological interactions among A. flavus, H. burtonii, and B. amyloliquefaciens were also examined on maize and rice extract agars under similar controlled conditions
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[en] This book describes the nature, source, analysis and detection of marine toxins, freshwater toxins and mycotoxins. The first part covers functional and analytical methods to monitor the presence of the toxins in food, and the different technical approaches. There is a full chapter dedicated to the need for certified calibrants and materials for analysis and quantitation, and two chapters to discuss how to evaluate in vitro and in vivo the acute toxicity of natural food toxins. The last chapters describe the nature of each of the known toxin groups, with a final chapter covering the different technical options to analyze the presence of toxins in the environment.
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2018; 283 p; De Gruyter; Berlin (Germany); ISBN 978-3-11-044203-8;
; ISBN 978-3-11-044204-5 (ELECTRONIC);
; ISBN 978-3-11-043363-0 (ELECTRONIC); 



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Mammadov, Kh. F, E-mail: nukl@box.az2011
AbstractAbstract
[en] Full text: The kinetics of degradation of natural polycyclic toxins in grains and dried fruits under the influence of UV-light and ionizing radiation 60C and the probability of radiolytic detoxication of these products has been studied for the first time
Original Title
Tebii politsiklik mikrotoksinlerin fotolitik ve radiolitik destruksiyasi
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Available in abstract form only, full text entered in this record; Translated from Azerbaijan
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Journal Article
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Translation
Journal
Chemical Problems; ISSN 2221-8688;
; v. 242(5); 8 p

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[en] The described method allows to determine picogram amounts of the total of aflatoxins in biological materials. [2,3-can be prepared to a specific activity of min. 30 Ci/mmol and whose use may increase the sensitivity of radioimmunoassay up to 6 pg/0.1 ml of sample. Examples are given of the determination of aflatoxin in milk and in fodder. (M.D.)
Original Title
Zpusob stanoveni aflatoxinu radioimunologickou analyzou
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1 Aug 1985; 10 Jan 1980; 4 p; CS PATENT DOCUMENT 215289/B/; CS PATENT APPLICATION PV 225-80; Application date: 10 Jan 1980
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Patent
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AbstractAbstract
[en] To examine the sensitivities of the Limulus test and the inhibitory factors in radiopharmaceuticals, the following procedures were employed. Twenty commonly used radiopharmaceuticals were examined by Limulus Lysate (Pre-gel). In order to detect the inhibitory factors, several doses of endotoxin (E. coli) were added to the radiopharmaceuticals before the Limulus test was made and the results were compared with control results using saline solution of endotoxin. When the pH of the reaction solution lay out of a suitable range (6.0-7.5), the pH was adjusted by Tris-HCl buffer before the reaction. The sensitivity of the Limulus test control using Pre-gel was positive at a concentration of 10-3 μg/ml of endotoxin. The Limulus test was sensitive and without inhibitory reactions for sup(99m)TcO4-, sup(99m)Tc-albumin, sup(99m)Tc-MAA, sup(99m)Tc-Sn-colloid, 131I-hippurate, Na131I, Na251CrO4, 67Ga-citrate and 57Co-bleomycin as they were supplied. 111In-DTPA, sup(99m)Tc-phytate, sup(99m)Tc-pyrophosphate, sup(99m)Tc-DTPA, 131I-PVP, 59FeCl3, Na-phosphate (32P), 198Au-colloid and 75Se-selenomethionine needed to have their pH adjusted to avoid inhibition. Benzyl alcohol in the radiopharmaceutical showed an inhibitory effect at a concentration greater than 1%. Commonly used 169Yb-DTPA which was evaluated by this test had a sensitivity of 2.5 x 10-3 μg/ml due to addition of a small amount of benzyl alcohol. 131I-BSP showed intense inhibition in gelation reaction. Contaminations of endotoxin were detected in sup(99m)Tc-albumin, sup(99m)Tc-Sn-colloid, 131I-hippurate, Na131I, Na251CrO4, 198Au-colloid, 57Co-bleomycin and 75Se-selenomethionine. (auth.)
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Radioisotopes (Tokyo); v. 24(8); p. 560-566
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