Related Experiment Videos
Toxic metabolite produced by Aspergillus wentii
Abstract:
Mycelial extracts of an Aspergillus wentii strain grown on yeast-extract sucrose medium and initially isolated from country-cured ham were highly toxic when inoculated into chicken embryos or fed to mice. Moldy corn and rice were less toxic when fed to mice. Water extracts of moldy corn or rice or culture filtrates from yeast-extract sucrose medium were not toxic. Purification by thin-layer chromatography followed by crystallization yielded orange-red crystals that showed high toxicity and had a melting point of 285 to 286 C. Chloroform solutions of the crystals had absorption maxima at 270, 295, and 452 nm. The smallest amount of this component necessary to have zero hatchability of fertile eggs was 50 mug/egg.
Insights
Toxicity was identified in Aspergillus wentii, a mold found on country-cured ham. Purified extracts yielded toxic orange-red crystals, demonstrating significant toxicity to chicken embryos and mice.
Area of Science:
- Mycology
- Food Science
- Toxicology
Background:
- Aspergillus wentii is a fungal species sometimes found in food products.
- Previous research has not fully characterized the toxic potential of this specific strain.
Purpose of the Study:
- To investigate the toxicity of an Aspergillus wentii strain isolated from country-cured ham.
- To identify and characterize the toxic compound produced by the fungus.
Main Methods:
- Mycelial extracts and moldy food samples were tested for toxicity in chicken embryos and mice.
- Purification of the toxic compound was achieved using thin-layer chromatography and crystallization.
- Spectroscopic analysis (UV-Vis) and melting point determination were performed on the purified compound.
Main Results:
- Mycelial extracts were highly toxic to chicken embryos and mice.
- Moldy corn and rice showed lower toxicity.
- Purification yielded toxic orange-red crystals with a melting point of 285-286°C and specific UV-Vis absorption maxima.
- The toxic component caused zero hatchability in fertile eggs at 50 µg/egg.
Conclusions:
- Aspergillus wentii isolated from country-cured ham produces a highly toxic compound.
- The toxic compound is a crystalline substance with specific physical and chemical properties.
- Further research is needed to determine the chemical structure and toxicological implications of this compound.