Related Experiment Video
Updated: May 12, 2026
07:15
Mitochondrial Respiration Quantification in Yeast Whole Cells
Published on: November 8, 2024
Ochratoxin A in Brewer's Yeast Used as Nutrient Supplement
1Institute for Microbiology and Toxicology, Federal Center for Meat Research, Kulmbach, Germany.
Mycotoxin Research
|April 23, 2013
Summary
Brewer's yeast supplements can contain ochratoxin A (OTA), a mycotoxin. This study found OTA in 63% of German brewer's yeast samples, posing a potential dietary exposure risk.
Area of Science:
- Food Science
- Analytical Chemistry
- Toxicology
Background:
- Brewer's yeast (Saccharomyces cerevisiae) is widely used in brewing and as a nutritional supplement.
- Concerns exist regarding potential contaminants in food supplements.
- Ochratoxin A (OTA) is a mycotoxin with potential health implications.
Purpose of the Study:
- To investigate the occurrence of ochratoxin A (OTA) in brewer's yeast food supplements available on the German market.
- To assess the potential dietary exposure risk associated with OTA in brewer's yeast consumption.
Main Methods:
- Analysis of 51 brewer's yeast samples from Germany.
- Immunoaffinity cleanup followed by High-Performance Liquid Chromatography (HPLC) with fluorescence detection for OTA quantification.
Main Results:
- Ochratoxin A (OTA) was detected in 32 out of 51 samples (63%).
- Contamination levels ranged from the detection limit (0.03 ng/g) to 1.53 ng/g.
- Mean OTA values varied by product form (powder, dragees).
- Estimated daily intake increase due to brewer's yeast consumption was significant, especially for children.
Conclusions:
- Brewer's yeast food supplements represent an unrecognised source of ochratoxin A (OTA) exposure.
- Consumption of contaminated brewer's yeast poses a potential dietary risk.
- Screening of brewer's yeast supplements for OTA is recommended for food safety and quality control.
More Related Videos
Related Concept Videos
01:25Microbes in Beverage Production
Alcoholic beverages such as wine, beer, and spirits are the products of microbial fermentation processes that transform simple sugars into ethanol and a wide array of complex flavor compounds. These transformations rely on the metabolic activities of specific yeasts and bacteria, which are selected and controlled to yield the desired beverage characteristics.Wine Fermentation and MaturationWine production begins with the crushing of grapes to release juice and pulp, forming a must that is...
01:22Bioreactor Controls-III
Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...
01:18Bioreactor Controls-II
In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the fermentor via a sparger...
01:15Antifungal Agents
Amphotericin B is a broad-spectrum antifungal agent that exploits structural differences between fungal and mammalian cell membranes. Its amphipathic structure—featuring a hydrophobic polyene-lactone ring and a hydrophilic region containing mycosamine and carboxylic acid groups—enables selective binding to ergosterol, a sterol predominantly found in fungal plasma membranes. This selective interaction underlies the drug’s antifungal activity, although weak binding to cholesterol contributes to...
01:29Fungal Group Zygomycota
Zygomycota, previously classified as a distinct fungal group, are primarily terrestrial, saprophytic molds that play a crucial role as decomposers. Recent phylogenetic studies have revealed that these fungi are now divided into two major clades — Mucoromycota, which includes many symbiotic species, and Zoopagomycota, which primarily consists of parasitic and pathogenic fungi. These groups exhibit distinct ecological roles and reproductive strategies while sharing key structural and...