This complex, also
known as the melamine-cyanurate complex, is a cause of human and animal health problems. In this work we present two examples
of the incidence of melamine and cyanuric acid in two feed products originating from China. They were rice and the pea concentrates
intended for animal nutrition. Protein concentrates can be the main risk factor for food chain contamination with melamine and
cyanuric acid, especially those of unknown origin. Feed with a high content of nitrogen compounds and low content of aminoacids
can be regarded as particularly suspicious. A comparison of results for determining nitrogen compounds and amines can be used as
proof of adulteration of protein feeds. These feeds must be subjected to further analysis to determine melamine and cyanuric acid