As a water-soluble food additive, CMC has the functions of thickening, stabilizing, emulsifying and shaping, and has a wide range of uses in the food industry.
Properties of CMC
CMC is the abbreviation of CarboxyMethylCellulose in English, sodium carboxymethylcellulose in Chinese, and the molecular formula is C6H7(OH)2OCH2COONa. CMC is a fiber derivative obtained by chemical modification of natural cellulose. It is one of the important water-soluble polymers. CMC has excellent properties such as thickening, dispersing, suspending, bonding, film-forming, protecting colloid and protecting moisture, and is widely used in food, medicine, toothpaste and other industries.
CMC is white or slightly yellow powder, granular or fibrous solid, odorless, tasteless and non-toxic.
CMC is a macromolecular chemical substance that can absorb water and swell. When swollen in water, it can form a transparent viscous glue, which is neutral in pH.
Solid CMC is stable to light and room temperature, and can be stored for a long time in a dry environment.

CMC has hygroscopic properties, and its hygroscopic degree is related to atmospheric temperature and relative humidity. When it reaches equilibrium, it will no longer absorb moisture.
CMC aqueous solution has excellent adhesion, thickening, emulsification, suspension, film formation, protective colloid, moisture retention, resistance to enzymatic hydrolysis and metabolic inertness.
When CMC aqueous solution meets tin, silver, aluminum, lead, iron, copper and some heavy metals, precipitation reaction will occur; when CMC aqueous solution coexists with calcium, magnesium, and salt, precipitation will not occur, but it will reduce the viscosity of CMC aqueous solution.
CMC aqueous solution and aqueous solutions such as water-soluble animal gum, glycerol, ethylene glycol, sorbitol, acacia, pectin and soluble starch are all miscible with each other.
CMC solids in acetone, benzene, acetate, carbon tetrachloride, castor oil, corn oil, peanut oil, methanol, ethanol, ether, chloroform, trichloroethane, gasoline, methyl ethyl ketone, toluene, xylene, turpentine, etc. Insoluble in substances.
When the CMC aqueous solution encounters acid, the acid CMC precipitate will be precipitated. But acid-resistant CMC has certain resistance to acid solution.