Sodium Carboxymethylcellulose

The chemical formula is [C6H7O2 (OH) 2OCH2COONA] N

Sodium carboxymethyl cellulose is usually made of natural cellulose and caustic soda and a chloroacetic acid reaction and made of an anionic polymer compound, molecular weight from thousands to millions.White to light yellow powder, granular or fibrous material, hygroscopicity is strong, soluble in water, in neutral or alkaline, solution is high viscosity liquid.Stable to drug, light and heat.But the heat is limited to 80℃, 80℃ above a long time heating, viscosity is reduced, insoluble in water.Its relative density is 1.60, and the relative density of the flakes is 1.59.The refractive index is 1.515.It is brown when heated to 190 ~ 205℃, and carbonized to 235 ~ 248℃.Its solubility in water depends on the degree of substitution.Insoluble in acids and alcohols, does not precipitate in salt.It is not easy to ferment, the emulsification ability of oil and wax is large, and it can be kept for a long time. There are two categories of products: alkaline and neutral, alkaline, industrial low viscosity (2% aqueous solution) 0.2 ~ 0.5Pa·s;Medium viscosity (2% aqueous solution) 0.3 ~ 0.6Pa·s for industrial use, high viscosity (2% aqueous solution) 0.8 ~ 1.0Pa·s for industrial use.

classification

The main application according to the use of different alkaline and neutral two categories of products, alkaline, industrial low viscosity (2% aqueous solution) 0.2 ~ 0.5Pa·s;Medium viscosity (2% aqueous solution) 0.3 ~ 0.6Pa·s for industrial use, high viscosity (2% aqueous solution) 0.8 ~ 1.0Pa·s for industrial use.

Widely used in petroleum industry digging well mud treatment agent, synthetic detergent, organic lotion, textile printing and dyeing sizing agent, daily chemical products water-soluble colloidal viscosifier, pharmaceutical industry viscosifier and emulsifier, food industry with thickening agent, ceramic industry with adhesive, industrial paste, paper industry with sizing agent.Used as flocculant in water treatment, mainly used in wastewater sludge treatment, can improve the solid content of filter cake.

Sodium carboxymethyl cellulose is also a thickening agent, because of its good functional characteristics in the food industry has been widely used, it also promotes the rapid and healthy development of the food industry to a certain extent.For example, it can be used to stabilize sour milk drinks and increase the viscosity of yogurt system because it has a certain thickening and emulsifying effect.Because of its hydrophilicity and rehydration, it can be used to improve the edible quality of bread and steamed bread, prolong the shelf life of pasta products and enhance the taste.It can be used in the manufacture of jelly and jam because of its gelling effect.It can also be used as an edible coating material, combined with other thickening agents, smear on some food surface, can maximize the preservation of food, and because it is an edible material, will not cause adverse effects on human health.Therefore, food grade CMC-NA, as an ideal food additive, is widely used in food production in the food industry.

Functional characteristics of application in food

Thickening and emulsifying stabilization

The edible sodium carboxymethyl cellulose can emulsify and stabilize the oil lipoprotein drinks. The general characteristics of the oil drinks are that they contain different degrees of fat and a certain amount of protein. When stored, they are easy to separate and float up, forming an ugly "collar" and affecting the appearance of the products.

In addition, protein is easy to coagulate and separate, especially for products with low pH value, protein is bound to coagulate, and CMC-NA can effectively solve these problems. It dissolves into transparent and stable colloid in water, which can stabilize protein, reduce the surface tension between fat and water, and make fat fully emulsified.Therefore, CMC-NA is often used as a thickening agent in the food industry.

Water effect

Sodium carboxymethyl cellulose has hydration, in meat products, bread, steamed bread and other foods, can play a role in the improvement of the organization, but also can make the water is not volatile, can improve product output, increase taste.

gelation

Thixotropic sodium carboxymethyl cellulose refers to the fact that large molecular chains have a certain amount of interaction and tend to form three-dimensional structures.The apparent viscosity of the solution increases after the three-dimensional structure is formed.After breaking the three-dimensional structure, the apparent viscosity decreases.Thixotropy is a time-dependent change in apparent viscosity.The thixotropic carboxymethyl cellulose plays an important role in the gel system and is used to make jellies and jams.

A membranous

Sodium carboxymethyl cellulose can form a layer of film on the surface of food, can play a certain protective effect on fruits and vegetables, due to the existence of the film, the formation of a low oxygen, high carbon dioxide gas environment between the film and fruits and vegetables, thereby reducing the gas exchange rate, material exchange rate, used to extend the shelf life of fruits and vegetables.

Sodium carboxymethyl cellulose also has some other properties, such as suspension and chemical stability, these properties also laid the foundation for its widespread use in the food industry.