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Antibiotic residues in food present a significant public health concern, particularly nitrofurans, a class of broad-spectrum antimicrobials that includes furaltadone, furazolidone, nitrofurantoin, and nitrofurazone. These compounds have historically been used in food-producing animals to treat and prevent infections. However, because studies link them to potential carcinogenic effects and other health risks, many countries—including the United States, Canada, and the European Union—have banned their use. In addition, strict regulations prohibit the import of food products containing detectable nitrofuran residues.

To protect consumers, authorities carry out ongoing monitoring of food products and environmental sources such as water. This ensures that prohibited veterinary drugs are not misused and do not enter the human food chain. Furthermore, surveillance focuses on high-risk commodities such as meat and animal-derived products, where residues may persist after veterinary treatment.

However, detecting nitrofurans presents a technical challenge. The parent compounds metabolise rapidly in animal tissues after administration, which makes direct detection difficult. Therefore, laboratories instead target stable, protein-bound metabolites that remain in edible tissues for longer periods.

One of the most important markers is AOZ (3-amino-2-oxazolidinone), a metabolite derived from furazolidone. Importantly, AOZ provides a reliable indicator of prior nitrofuran exposure. It remains stable under acidic conditions and resists degradation during common food processing methods, including cooking. As a result, it can still be detected in prepared food products.

Consequently, AOZ detection plays a critical role in food safety testing programmes. Laboratories use it to confirm compliance with international bans, while regulatory bodies rely on it to enforce safety standards. Overall, this approach helps protect public health and ensures that prohibited veterinary drug residues do not enter the food supply chain.