series, glycine is the most reactive. Longer
and more complex substituent groups reduce
the rate of browning. In the co-amino acid
series, browning rate increases with increasing
chain length. Ornithine browns more rapidly
than lysine. When the reactant is a
protein, particular sites in the molecule may
react faster than others. In proteins, the eamino
group of lysine is particularly vulnerable
to attack by aldoses and ketoses.