化学名称：L-2-氨基戊二酸；L-a-氨基戊二酸
分子式：C5H9NO4
结构式：HOOCCH2CH2CH(NH2)COOH
分子量：147.13
性状：白色结晶性粉末；几乎无臭，有特殊滋味和酸味。224℃-225℃分解。饱和水溶液的PH值约3.2.难溶于水，实际不溶于乙醇和乙醚，极易溶于甲酸。溶解度（g/100g水）；0.72（20℃），1.51（40℃），3.17（60℃），6.66（80℃）
质量标准：日本味之素公司标准。
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| 项目 | 指标 |
| 含量（C5H9NO4）%(干基计) | 99.0%-100.5% |
| 比旋光度【a】20°D | +31.5-+32.5 |
| 【a】25°D 546.1nm | +37.7-+38.5 |
| 砷（以As计）% ≤ | 0.0001 |
| 重金属（以Pb计）% ≤ | 0.001 |
| PH值（1%水）≤ | 3.0-3.5 |
| 干燥失重（105℃，3h），% ≤ | 0.1 |
| 灼伤残渣（以硫酸盐计）≤ | 0.1 |
| 氯化物（以CI计） ≤ | 0.02 |
| 硫酸盐（以SO4计） ≤ | 0.02 |
| 铵盐（以NH4计）% ≤ | 0.02 |
| 溶液透光度%（0.1g/mL，HCI溶液） ≥ | 98.0 |
| 铁盐（以Fe计） ≤ | 0.001 |
用途：
00001. 在食品工业方面：
1） 用作代盐剂、营养增补剂、鲜味剂（主要用于肉类、汤类和家禽等）。如用于方便食品的肉汤和汤类，10g/kg。用于饮料。烘烤制品、肉、肉香肠、肉汤、乳及肉制品、调味剂、谷类制品，用量400mg/kg。用作营养增补剂，限量12.4（以食品中蛋白质的总量计）。
2） 可用作虾。蟹等水产罐头中产生磷酸铵镁结晶的防止剂，用量0.3-1.6.
3） L-谷氨酸单钠盐（MSG谷称“味精”）具有强烈的肉类鲜味，是除食粮和食盐之外世界消费量最多的一种调味剂。特别是在PH 值为6-7时，MSG全部解离，呈味最强。广泛用于烹饪和食品加工。一般用量为0.2-0.5，人均日允许摄入量不超过6g/d。
4） L-谷氨酸盐酸用地改善啤酒苦味，也可用作代盐剂、营养增补剂、增香剂。
00001. 在医药工业方面：
1）L-谷氨酸是非必要氨基酸，它在体内代谢，容易失去氨基，与酮酸发生转移反应，能合成其他氨基酸。食用后，有96-谷氨酸可被体内吸收，因此可作为营养增补剂“要素膳”的原料之一，在临床山使用。
2）作为氨基酸输液配方的组分之一。
3）L-GIU参与脑蛋白和碳水化合物的代谢，促进氧化过程。具有兴奋性传质作用，一次它对改善和维持脑机能是必不可少的。它具有抑郁中枢神经兴奋的作用，可用于精神病患者和智力低下儿童的补脑剂，以及癫痫病、、记忆力障碍等治疗药剂。
L-Glutamic Acid
Chemical name: L-2-amino-glutaric acid; La-amino-glutaric acid
Molecular Formula: C5H9NO4
Structural formula: HOOCCH2CH2CH (NH2) COOH
Molecular Weight: 147.13
DEscriptION: White crystalline powder; almost no smell, there is a special flavor and acidity. Decomposition is 224 ℃ -225 ℃. Saturated aqueous solution of the PH value of about 3.2. Difficult to dissolve in water, insoluble in ethanol and ether, the actual, easily soluble in formic acid. Solubility (g/100g water); 0.72 (20 ℃), 1.51 (40 ℃), 3.17 (60 ℃), 6.66 (80 ℃)
Quality Standard: Ajinomoto company standards
APPLICATION：
In the food industry:
1) as a generation of salts, nutritional supplements, flavor agent (primarily for meat, soups and poultry, etc). For convenience foods such as broth and soups, 10g/kg. For beverages. Baking products, meat, meat, sausage, broth, milk and meat products, flavoring agent, cereal products, dosage 400mg/kg. Used as a nutritional supplement, limited 12.4 (in term of the amount of protein in food ).
2)Can be used as shrimp. Canned crab and other aquatic produce magnesium ammonium phosphate crystals in the prevention of agent, dosage 0.3-1.6.
3) L-monosodium glutamate (MSG Valley, known as "MSG"), has a strong meat flavor, is the world's largest outside of a flavoring agent besides
food and salt. Especially in the PH value is 6-7 pm, MSG all of dissociation, was the strongest flavor. Widely used in cooking and food processing. General dosage is 0.2-0.5 per capita daily intake of no more than 6g / d.
4) L-Glutamic acid hydrochloride not only can improve beer bitterness, but also can be used on behalf of salts, nutritional supplements, flavor enhancer.
In the pharmaceutical industry:
1) L-Glutamate is an non-essential amino acid metabolism. It is easy to lose amino acid when occur the transfer reaction. After eating, there are 96 - glutamic acid can be absorbed into the body, it can be used as nutritional supplements, "elemental diet" as one of raw materials, used in clinical Hill.
2) As a component of one of the amino acid infusion formulations.
3) Involved in promoting the oxidation process of protein and carbohydrate. With the excitatory role of mass transfer, it can improve and maintain brain function. It has the role of depression and central nervous excitement and additional brain agents of mental illness and mental retardation of children, as well as epilepsy, hypertension, memory disorders, the treatment agents.