The study by Afonso and colleagues explores the potential of yeast-based biosensors (YBBs) as innovative tools for rapid, in-line safety and quality monitoring in fermented beverages.

YBBs employ yeast cells, often Saccharomyces cerevisiae, as biological recognition elements. In the presence of a contaminant, the system activates a reporter (fluorescence, luminescence, colorimetric, or electrochemical signal), enabling rapid and potentially in-line detection.

The operational advantage lies in the robustness of yeast in complex matrices and the ability to design highly specific genetic circuits.

The most advanced applications involve the detection of heavy metals (e.g., Cu²⁺, Cd²⁺) and mycotoxins (zearalenone, aflatoxins, DON) using engineered strains with heterologous receptors or surface display systems, a technique that involves exposing proteins or antibody fragments capable of selectively binding the target molecule to the cell surface, transforming the binding into a measurable signal. Acetic acid biosensors are also noteworthy. Systems dedicated to biogenic amines and the direct detection of spoilage microorganisms such as Brettanomyces or Candida spp. remain underdeveloped.

Despite promising results, most YBBs are still in the laboratory stage. Critical issues include stability in real matrices, signal reproducibility, and regulatory constraints related to the use of GMOs.

In summary, yeast-based biosensors represent a versatile and low-cost analytical platform with significant potential for the early detection of contaminants in the beverage industry. The challenge now is to translate this innovation into industrially validated solutions.

Bibliographic references: Afonso, S.; Oliveira, I.; Vilela, A. Yeast Biosensors for the Safety of Fermented Beverages. Biosensors 2026, 16, 64. https://doi.org/10.3390/bios16010064