The final washes were pooled and taken to dryness to yield a
brownish syrup that was used for precipitation or crystallization
in order to further purify arginine. Precipitation yielded a white
pellet containing 90.7% arginine (Table 2). The exact mass of this
precipitate was 175.1191 (M+) similar to 175.1190 (M+) of the pure
arginine.