المدونة

Monosodium glutamate, a white prismatic crystalline solid at room temperature and pressure, has a specific meat fresh flavor and a certain solubility in water. The substance is an amino acid derivative, it is a widely used fresh flavor agent and food flavoring agent, in a variety of food processing and production process has a better application. The presence of monosodium L-glutamate is partly responsible for the flavoring effect that tomatoes, fermented soy products, yeast extracts, certain sharp cheeses, as well as fermented or hydrolyzed protein products such as soy sauce or soybean paste, can bring.

1. Chemical Properties

Monosodium L-glutamate contains an asymmetric carbon atom in its molecular structure, which is optically active and can rotate the polarized plane of light by a certain angle. The substance is more stable to light and heat, and its 10% aqueous solution at pH 6.9 has a decomposition rate of about 0.6% when heated at 100°C for 3h under the condition of aeration; it can undergo dehydration and condensation when heated to 120°C. It is worth noting that the substance produces glutamic acid or glutamic acid hydrochloride in acidic environments, however, in alkaline environments monosodium L-glutamate undergoes a chemical reaction to produce the corresponding disodium glutamate.

2. Applications

Monosodium L-glutamate is a commonly used food flavoring agent, and it is the most widely used freshness agent both domestically and internationally. When the substance is used as a flavoring agent, the general dosage is 0.2% to 0.5%. In addition to separate use, the substance is best used with ribonucleotides and sodium inosinate and other nucleic acids such as seasoning materials with a composite seasoning to improve the effect. monosodium L-glutamate has a strong meat flavor, MSG diluted with water up to 3,000 times can still feel the fresh taste, widely used in the family, catering, food processing industry (soup, sausage, fish cake, hot sauce, canned food, etc.). Sodium guanosine monosodium glutamate is used together with this substance to enhance the freshness with synergistic effect, and it is also known as freshness enhancer or powerful MSG. In addition, the substance can be used as organic synthesis intermediates in the industry, but in the world's annual output, this use accounts for a very small proportion of such applications as auxiliaries, osmotic membranes, silk protein modification, leather auxiliaries, biomedical materials, modified regeneration of collagen fibers and other fields.

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