| Synonyms | Potassium glutamate, MPG |
| Definition | |
| Chemical name | Monopotassium L-glutamate monohydrate |
| Einecs | 243-094-0 |
| Chemical formula | C5H8KNO4 · H2O |
| Molecular weight | 203,24 |
| Assay | Content not less than 99,0 % and not more than 101,0 % on the anhydrous basis |
| Description | White, practically odourless crystals or crystalline powder |
| Identification | |
A.Positive test for potassium | |
B.Positive test for glutamic acid by thin-layer chromatog-raphy | |
C.Specific rotation [α]D 20 | Between 22,5o and 24,0o |
| (10 % solution (anhydrous basis) in 2N HCl, 200 mm tube) |
D.pH of a 2 % solution | Between 6,7 and 7,3 |
| Purity | |
| Loss on drying | Not more than 0,2 % (80 oC, 5h) |
| Chloride | Not more than 0,2 % |
| Pyrrolidone carboxylic acid | Not more than 0,2 % |
| Lead | Not more than 2 mg/kg |