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| Item | STANDARD | |
| Characteristics | A white crystalline or crystammine powder acid taste and slightly agreeable. | |
| Specific rotation [a]D20° | +30.5 °~ +32.5° | |
| Chloride (Cl) | 0.02% max | |
| Ammonium (NH4) | 0.02% max | |
| Sulfate (SO4) | 0.02% max | |
| Iron (Fe) | 10ppm max | |
| Heavy metals (Pb) | 10ppm max | |
| Cadmium | 1ppm max | |
| Mercury | 0.1ppm max | |
| Arsenic (AS2O3) | 1ppm max | |
| Other amino acids | Conform to starndard. | |
| Loss on drying | 0.5% max | |
| Residue on ignition(sulfated) | 0.10% max | |
| Assay: | 98.5% to 100.5% | |
| PH | 3.0 to3.5 | |
글루탐산은 20가지 단백질 아미노산 가운데 하나이며 코돈은 GAA, GAG이다. 동물의 체내에서 신경 전달 물질로 기능한다. 글루탐산 수용체를 통해 신경 말단의 흥분을 전달한다.
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