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The subject of this work was fumonisin B1 (FB1) and moniliformin (MON) biosynthesis by three isolates of Fusarium oxysporum and three isolates of F. proliferatum of asparagus spears origin. The cultures of fungi were grown on rice and asparagus media for 3 weeks at 20°C. Experiment was carried out in 3 replicates. FB1 and MON occurrence was evaluated with high-performance liquid chromatography (HPLC) analyses. Analysis of variance was carried out to determine biosynthesis of FB1 and MON by F. oxysporum and F. proliferatum. FB1 was found in the amount up to 2012.8 μg/g in cultures of F. proliferatum on rice and in a very small amount in two cultures on asparagus medium. F. oxysporum did not produce FB1 on any of the media. MON was biosynthesized by two the same isolates of F. oxysporum in the amount up to 182.8 μg/g on rice and up to 743.3 μg/g on asparagus medium and one isolate (different on each medium) of F. proliferatum.
Fusarium oxysporum and/or F. proliferatum were isolated from all asparagus spears with brown spots (which indicate an infection) and from almost all spears without spots. The presence of Fusarium spp. And their toxins in the basal parts of asparagus spears was analyzed. Fumonisin B₁ (FB₁) and moniliformin (MON) were found in spears with brown spots and those without disease symptoms. FB₁ was determined in the concentration range 0.16-152.68 ng g⁻¹ (mean 7.52), while moniliformin was detected in the range 15.30-585.00 ng g⁻¹ (mean 121.00). Only in 10% analyzed spears were metabolites not detected.
Ochratoxin A (OA), zearalenone (ZON), moniliformin (MON) as well as trichotecenes and fumonisines (FUM) are naturally occurring contaminants of cereals and animal feed. They pose a health risk not only to humans but also to livestock and, as a consequence, may cause economical losses either due to unfavorable effects on domestic animals themselves or to an increased potential for health effects in human beings consuming mycotoxin-contaminated edible animal products. At present, large-scale studies are carried out in EU countries to determine a safe, admissible concentration of these toxins in cereals and their processed products. The aim of this review is to collect and summarize information concerning the properties, occurrence and toxicity of these mycotoxins.
A total of 50 samples of poultry feed mixtures of Slovak origin were analysed for fumonisin B1 and B2 (FB1, FB2) and moniliformin (MON) using SAX-clean up procedure being detected by high pressure liquid chromatography with mass spectrometry (HPLC-MS) and diode array detection (HPLC-DAD), respectively. The samples were also simultaneously investigated for Fusarium species occurrence, and for the capability of Fusarium isolates recovered to produce FB1 and MON in vitro. FB1 was detected in 49 samples (98%) in concentrations ranging from 43 to 798 µg.kg-1, and FB2 in 42 samples (84%) in concentrations ranging from 26 to 362 µg.kg-1. MON was detected in 26 samples (52%) in concentrations that ranged from 42 to 1,214 µg.kg-1. Only two Fusarium populations were encountered, namely F. proliferatum and F. subglutinans, of which the former was the most dominant and frequent. All 86 F. proliferatum isolates tested for FB1-production ability proved to be producers of the toxin although none of them produced MON. On the contrary, MON production was observed in a half out of 16 F. subglutinans isolates tested, yet no FB1 production was detected in this case. Despite the limited number of samples investigated during this study, it is obvious that poultry feed mixtures may represent a risk from a toxicological point of view and should be regarded as a potential source of the Fusarium mycotoxins in central Europe. This is the first reported study dealing with fumonisin and moniliformin contamination of poultry feeds from Slovakia.
The effects of fusarial toxins: DAS, T-2, DON, 3 Ac-DON, MON and ZEA, on actively dividing root tip cells of rye, wheat and field bean were investigated. Three concentrations: 1, 5 and 10 µg mL⁻¹ were applied for 24 hours. Nuclei and chromosomes were stained using the Feulgens method. It has been found that trichothecene mycotoxins (DAS, T-2, DON, 3 Ac-DON) had a profound effect on mitosis, as they decreased the mitotic index, produced excessive condensation of pro- and metaphase chromosomes, C-metaphascs and C-anaphases, and caused an accumulation of metaphases. The main effect of trichothecene mycotoxins, probably caused via their influence on protein synthesis, was abnormal functioning of the mitotic spindle.
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