Dissolve 5'- sodium oleate (GMP) in water, and filter out insoluble substances; Decolorizing with activated carbon, adjusting the pH value to be close to 7, adding Dex- 1 (or Dex-2) and salt, heating to make spraying liquid, then spraying the spraying liquid on the surface of monosodium glutamate with a spray gun at 55 ~ 60℃, and heating and drying while spraying.

The actual result 1. When the amount of Dex- 1 is close to or equal to the GMP amount, the effect is good.

2. The coating temperature is 55 ~ 60℃ when spraying.

3. When spraying100g monosodium glutamate, the appropriate solution volume is 40 ~ 50ml, that is, the concentration of GMP in the solution is 4 ~ 5%.

4. Using Dex-2 instead of Dex- 1 can also get good products, but Dex-2 is insoluble in water and easy to precipitate solids when cooling.

5. The effect of batch production is ideal, the preparation is repeated, there is no amplification effect, and it is easier to operate in batch production with a small amount, and the introduction of salt of about 1% has no effect on the product quality.

6. Sodium glutamate, GMP, Cex- 1 (or Dex-2) and refined salt, with the weight ratio of 97∶3∶3∶ 1.