CMC ( Carboxymethyl Cellulose ) is used in food under the E number E466 as a viscosity modifier or thickener, and to stabilize emulsions in various products including beverages, yoghurts etc.

for further reference you could see http://celluloseether.com/sodium-carboxymethyl-cellulose-cmc/

Thanks, yes, it can be used as co-emulsifier but what about emulsifier ?

Dear Behnoush,

You can use Quillaja Saponin as a natural emulsifier. There's a lot of work nowadays on quillaja saponin and other biosurfactants on its application in food and beverage industries.

For further information, you can check this review.

Thanks Hassan, I used it, i can not produce emulsion with droplets lower than 150- 200 nm even in high concentration.