Ochratoxin A in the Portuguese Wine Market, Occurrence and Risk Assessment

ABSTRACT

Ochratoxin A (OTA) is mainly found in cereals and cereal-based foodstuffs, but also in wine. Being one of the most consumed alcoholic drinks in Portugal and one of the main sources of human exposure to OTA, wine monitoring and exposure studies are essential. The analytical methodology consisted of the direct injection of the filtered samples into the liquid chromatograph, equipped with fluorescent detection (LC-FLD). Linearity was adequate, both in mobile phase and in matrix-matched solutions, with R² values higher than 0.997. The limits of detection were 0.08 and 0.39 µg/L for white and red wine, respectively and recoveries were above 91.9%. One hundred wine samples acquired on the Portuguese market were investigated. In 5 samples the OTA was detected, with the red wine presenting higher frequency of contamination. Regarding the risk to human health it was observed that the estimated weekly intake (EWI) is considerably lower than the established tolerable weekly intake (TWI).

KEYWORDS:

• Ochratoxin A
• wine
• direct injection
• LC-FLD
• human risk assessment

Acknowledgments

The authors gratefully acknowledge the Portuguese governmental FCT for funding support through the project UID/QUI/50006/2013.

Additional information

Funding

This work was supported by the Fundação para a Ciência e a Tecnologia [Project UID/QUI/50006/2013].