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Mar 13, 2026 - Foods

High contamination of wine and grape juice with Alternaria toxins – Ochratoxin A only rarely detectable

Alternaria toxins more common than Ochratoxin A

The analysis revealed that Alternaria toxins were significantly more detectable than Ochratoxin A (OTA). While OTA was present in only 5% of the samples, Alternaria toxins were found in about 80% of the samples. Tenuazonic acid (TEA) and Alternariol (AOH) were particularly common.

For Ochratoxin A, there are binding maximum levels for wine and grape juice in the EU according to Regulation (EU) 2023/915. However, the analyzed OTA levels in all samples were below the permitted limits, so from a food safety perspective, there was no need for action.

For Alternaria toxins, there are currently no legal limit values, only general guidelines. There are no specific regulations for grapes and products made from them so far.

Significance for winemakers and producers
The results underscore the importance of regular mycotoxin analysis in wine and grape juice. Producers and winemakers should particularly focus on controlling Alternaria toxins to ensure product safety and minimize potential risks for consumers.

The Tentamus laboratories routinely conduct chemical analyses for mycotoxins and offer manufacturers fast, reliable results as well as individual advice on food safety.

 
Sources:

CVUA Sigmaringen: Contamination of wine and grape juice with mycotoxins