Ochratoxin A

Identity and health significance

Ochratoxin A, commonly abbreviated OTA, is a secondary metabolite produced by selected Aspergillus and Penicillium strains. EFSA's 2020 assessment identified kidney toxicity across tested animal species and considered both non-neoplastic and neoplastic effects in its risk characterisation. OTA is absorbed, binds strongly to plasma proteins and is eliminated slowly in several species. The assessment did not retain the older tolerable weekly intake as the governing human-health approach; it used margins of exposure because the evidence included genotoxicity and carcinogenicity concerns. These findings describe population risk and do not provide a simple concentration at which any particular cured-meat lot becomes acceptable.

How

OTA reaches meat OTA may reach meat through feed-derived residues in animal tissues, through contaminated ingredients, or through direct production by fungi on a ham rind or sausage casing. Experimental work comparing contaminated feed and processed products found low tissue carry-over in the studied conditions but a significant contribution from toxin-forming surface mould during ripening. P. nordicum is a central cured-meat species, while P. verrucosum and yellow aspergilli including A. ochraceus and A. westerdijkiae contribute under their own ecological conditions. Route attribution matters because supplier controls cannot correct a chamber reservoir, and surface control cannot remove an already contaminated spice lot.

Persistence and analytical meaning

OTA is comparatively stable under ordinary food processing. Stopping fungal growth does not establish that previously formed toxin has disappeared. Surface cleaning can remove biomass and perhaps some contaminated material, but its effectiveness depends on toxin distribution and penetration and cannot be assumed. Direct chemical analysis is needed to answer whether OTA is present and at what concentration in the defined test portion. Because contamination can be heterogeneous, sampling design is part of the measurement. The report should identify the lot, surface and depth, increment scheme, composite, preparation method, recovery, limit of quantification and result uncertainty.

Distribution, exposure and lot boundaries

A concentration result belongs to the sampled portion and lot definition. Surface formation can create steep gradients between rind and interior, while feed or ingredient routes may produce a different distribution. Trimming changes both mass and concentration basis and cannot be credited without data on how far contamination extends. Risk assessment also depends on consumption pattern, portion size and frequency, not concentration alone. For operational decisions, define which products shared the chamber, time window, ingredient lot and handling route. This turns a laboratory number into a traceable exposure question and prevents an unaffected-looking neighbouring lot from being released without considering common cause.

Legal scope and control

The EU contaminant regulation lists OTA maximum levels for specified categories including cereals, coffee, dried fruits, wine, spices and certain other foods. The cited consolidated annex does not list a harmonised OTA maximum specifically for cured meat. A business must still consider general food-safety obligations, national rules or guidance, customer specifications and authority instructions. Control is preventive: qualified ingredients, defined surface cultures, chamber hygiene, condensation prevention and a controlled time-temperature-humidity and drying trajectory. A detected or credibly suspected lot remains held until representative evidence and the applicable decision authority support release, reprocessing, diversion, recall or destruction.