Dissolve 80 g of monosodium glutamate in 130 mL of water then add 36 mL of hydrochloric acid with mechanical stirring. Let the mixture stand for 10 minutes and chill down in a freezer. Filter, wash with cold water and dry the glutamic acid in an oven. The yield is almost quantitative.
C5H8NO4Na + HCl = C5H9NO4 + NaCl
The solution prior to the addition of HCl
The solution after the addition of HCl
Rest of the glutamic acid crystallizing out upon chilling down
Damp filtered and washed glutamic acid
Dry glutamic acid