A yeast bioassay for trichothecenes.

Area of Science:

• Mycotoxicology
• Food Safety
• Cell Biology

Background:

• Eukaryotic cells, including yeasts, are susceptible to trichothecene mycotoxins like T-2 toxin and verrucarin A.
• Evaluating mycotoxin contamination in food commodities like corn is crucial for public health.

Purpose of the Study:

• To develop and optimize a sensitive yeast bioassay for quantifying trichothecene toxicity in corn samples.
• To establish the assay's reliability and efficiency for routine screening.

Main Methods:

• A yeast bioassay utilizing the sensitivity of eukaryotic cells to trichothecenes was optimized using spiked maize extracts.
• Toxicity was determined by comparing sample inhibition to T-2 toxin standards, with results validated using column clean-up for enhanced precision.
• Growth inhibition levels (EC85) were measured to establish quantitative thresholds.

Main Results:

• The optimized bioassay demonstrated high repeatability, with a relative standard deviation (RSD) of 4.5% for T-2 toxin standards at 85% growth inhibition (EC85).
• The assay accurately distinguished between corn samples with T-2 toxin concentrations above and below 58 ppb, enabling qualitative evaluation.
• The method allows for rapid (within 24 h) and cost-effective analysis of numerous samples.

Conclusions:

• The developed yeast bioassay is a reliable, sensitive, and practical tool for the qualitative assessment of trichothecene toxicity in corn.
• This method offers a low-cost, high-throughput solution for screening mycotoxin contamination in agricultural products.
• The bioassay can be adapted for broader applications, including the study of other trichothecene metabolites and related compounds.