L-Aspartic Acid → L-Aspartic Acid

Participants

Reaction Steps

A sample of 13.3 g (100 mmol) of aspartic acid was slurried in 100 ml distilled water with stirring, and the aspartic acid was partially neutralized with 5 ml of 10 N NaOH (50 mmol). Conc. NH4OH (3.38 ml, 14.8 N, 50 mmol) was pipetted into the beaker, fully neutralizing and solubilizing the aspartic acid. The beaker was placed in a drying oven at 120° C. overnight, producing a clear, slightly yellowish glass of the comonomers, aspartic acid (plus residual ammonium aspartate) and sodium aspartate. The beaker was then heated in a vacuum oven at 200° C., 25 mm Hg, for 4 hours, to convert the material to a copolymer of sodium aspartate and succinimide. Titration data confirmed the 1:1 residue ratio.

Provenance & Evidence