It follows from Figure 1 that in the suspicious protein
concentrates (rice and pea concentrates), in spite of the
high content of nitrogen compounds, there is a low content
of total aminoacids and a very high content of other
nitrogen compounds. On the contrary, common protein
concentrates, like those of potato and soya, are characterized
by their high content of total aminoacids and low content
of other non-protein nitrogen compounds. Analysis
of the rice and the pea protein concentrates revealed that
the increased content of nitrogen compounds was caused
by added melamine and cyanuric acid. In the rice protein
the content of melamine was 3 200 mg/kg and 3 096 mg/kg
for cyanuric acid; for the pea concentrate the melamine
content was 3 420 mg/kg and 3 260 mg/kg for cyanuric
acid. In reality, higher contents of these compounds can
be expected since the recovery of the methods used is 70%.