The browning of soybean paste seems to be largely to the
melanoidins formed by glucose-glutamic acid and glucose-lysine from the result of the color intensity of 60
MRPs prepared by heating each of five sugars with each
of 12 amino acids, the reactivity to browning, and the
contents of sugar and amino acid in the soybean paste.
Browning also tended to be accelerated in the presence of
a metal ion and inhibited by NaCl. Therefore, in order to
inhibit browning, we need to particularly control the
browning reaction between glucose-glutamic acid and
glucose-lysine in the presence of metal ion.