L-谷氨酸一钠 (CAS No.32221-81-1)
- 中文别名
- 味精；L-谷氨酸钠；谷氨酸一钠；α-氨基戊二酸一钠；味之素；一水合谷氨酸一钠
- 英文名称
- Monosodium L-glutamate
- 分子式
- C5H8NNaO4·H2O
- 所属类别
- 食品添加剂
- 物化性质
- 无色至白色棱柱状结晶或白色结晶性粉末，略有甜味或咸味，基本无气味。相对密度1.635，熔点195℃（一水合物）。易溶于水，25℃时溶解度约74g/100mL，5%水溶液pH为6.7~7.2；微溶于乙醇，不溶于乙醚。不吸湿，对光稳定，贮存时无变化。加热至120℃失去结晶水，150~160℃开始分子内脱水生成焦谷氨酸钠，约232℃熔化分解，约270℃分解成吡咯。鲜味阈值0.012g/100mL（6.25×10⁻⁴mol/L）。在高温及酸性条件（pH 2.2~4.4）下部分水解为5'-吡咯烷酮-2-羧酸；在强酸或强碱条件下可转化为DL-谷氨酸盐，呈味力降低。小鼠经口LD50为16.2g/kg，ADI不需特殊规定（FAO/WHO, 1994）。
- 技术参数
- 含量≥99% 相对密度1.635 熔点195℃（一水合物） 5%水溶液pH值6.7~7.2 包装规格25kg/桶，可按客户需求定制
English description（英文原文，共 1930 字符）
Product Name:Monosodium L-glutamate
English Name:Monosodium L-glutamate
CAS No.:32221-81-1
Aliases:MSG, Sodium glutamate, L-Glutamic acid monosodium salt, Monosodium glutamate monohydrate, Ajinomoto, α-Aminoglutaric acid monosodium salt
Molecular Formula:C5H8NNaO4·H2O
Physical Properties:Colorless to white prismatic crystals or white crystalline powder, with a slight sweet or salty taste and essentially no odor. Relative density 1.635, melting point 195°C (monohydrate). Freely soluble in water, solubility approximately 74 g/100 mL at 25°C; pH of 5% aqueous solution is 6.7–7.2. Slightly soluble in ethanol, insoluble in ether. Non-hygroscopic, stable to light, and unchanged during storage. Loses water of crystallization at 120°C; undergoes intramolecular dehydration at 150–160°C to form sodium pyroglutamate; melts with decomposition at approximately 232°C and decomposes to pyrrole at approximately 270°C. Umami threshold 0.012 g/100 mL (6.25×10⁻⁴ mol/L). Under high temperature and acidic conditions (pH 2.2–4.4), it partially hydrolyzes to 5'-pyrrolidone-2-carboxylic acid; under strong acid or strong alkaline conditions, it converts to DL-glutamate with reduced flavor-enhancing activity. Oral LD50 in mice is 16.2 g/kg; ADI not specified (FAO/WHO, 1994).
Uses:Monosodium L-glutamate is the most widely used flavor enhancer worldwide. In the presence of salt, it enhances the savory taste, and it exhibits a synergistic effect when combined with disodium 5'-inosinate or disodium 5'-guanylate. It may be added to various food categories according to production needs as regulated in China. It is also used to reduce sodium content in foods, as it can improve the flavor of low-salt products even when salt is reduced by 30%.
Technical Specifications:
Content ≥99%
Relative density 1.635
Melting point 195°C (monohydrate)
pH of 5% aqueous solution: 6.7–7.2
Packaging: 25 kg/drum, customizable upon request
English Name:Monosodium L-glutamate
CAS No.:32221-81-1
Aliases:MSG, Sodium glutamate, L-Glutamic acid monosodium salt, Monosodium glutamate monohydrate, Ajinomoto, α-Aminoglutaric acid monosodium salt
Molecular Formula:C5H8NNaO4·H2O
Physical Properties:Colorless to white prismatic crystals or white crystalline powder, with a slight sweet or salty taste and essentially no odor. Relative density 1.635, melting point 195°C (monohydrate). Freely soluble in water, solubility approximately 74 g/100 mL at 25°C; pH of 5% aqueous solution is 6.7–7.2. Slightly soluble in ethanol, insoluble in ether. Non-hygroscopic, stable to light, and unchanged during storage. Loses water of crystallization at 120°C; undergoes intramolecular dehydration at 150–160°C to form sodium pyroglutamate; melts with decomposition at approximately 232°C and decomposes to pyrrole at approximately 270°C. Umami threshold 0.012 g/100 mL (6.25×10⁻⁴ mol/L). Under high temperature and acidic conditions (pH 2.2–4.4), it partially hydrolyzes to 5'-pyrrolidone-2-carboxylic acid; under strong acid or strong alkaline conditions, it converts to DL-glutamate with reduced flavor-enhancing activity. Oral LD50 in mice is 16.2 g/kg; ADI not specified (FAO/WHO, 1994).
Uses:Monosodium L-glutamate is the most widely used flavor enhancer worldwide. In the presence of salt, it enhances the savory taste, and it exhibits a synergistic effect when combined with disodium 5'-inosinate or disodium 5'-guanylate. It may be added to various food categories according to production needs as regulated in China. It is also used to reduce sodium content in foods, as it can improve the flavor of low-salt products even when salt is reduced by 30%.
Technical Specifications:
Content ≥99%
Relative density 1.635
Melting point 195°C (monohydrate)
pH of 5% aqueous solution: 6.7–7.2
Packaging: 25 kg/drum, customizable upon request
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常见问题
- L-谷氨酸一钠的 CAS 号是多少？
- L-谷氨酸一钠的 CAS 号是 32221-81-1。
- L-谷氨酸一钠的分子式和分子量是什么？
- L-谷氨酸一钠的分子式为 C5H8NNaO4·H2O。
- L-谷氨酸一钠的英文名称是什么？
- L-谷氨酸一钠的英文名称为 Monosodium L-glutamate。
- L-谷氨酸一钠还有哪些别名？
- L-谷氨酸一钠又称 味精、L-谷氨酸钠、谷氨酸一钠、α-氨基戊二酸一钠、味之素、一水合谷氨酸一钠。
- L-谷氨酸一钠有哪些供应商和生产厂家？
- 掌上化工当前收录 1 条L-谷氨酸一钠供应报价，来自 1 家供应商，可按地区、纯度、级别筛选对比。
- L-谷氨酸一钠的供应商主要分布在哪些地区？
- L-谷氨酸一钠的供应商主要分布在 上海市（1 条） 等地。
- L-谷氨酸一钠有哪些级别可选？
- 平台上L-谷氨酸一钠的供应级别包括 工业级。
- L-谷氨酸一钠的报价单位是什么？
- L-谷氨酸一钠的报价单位主要有 千克。
- 哪里可以查到L-谷氨酸一钠的价格？
- 掌上化工L-谷氨酸一钠产品页汇总了各供应商的最新报价与规格，地址：/chemicals/32221-81-1/。部分供应商价格为电议，可通过页面上的询价功能直接获取。
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