In the potato and the soya protein concentrates, melamine
and cyanuric acid were not found. It can be concluded
from the results that in the rice and the pea proteins the
high contents of nitrogen in the determined nitrogen
compounds are caused by non-protein nitrogen, as documented
in Figure 2.
It follows from Figure 2 that in the rice protein there is
only 10.33% and in the pea protein only 3.01% of nitrogen
bound in aminoacids, whereas nitrogen in other nitrogen
compounds represents 89.67% and 96.99%, respectively. In
the potato and the soya concentrates almost 60% of nitrogen
was bound in aminoacids, while only 40% of nitrogen
was bound in other nitrogen compounds.