Carboxymethyl Cellulose Fiber

 

 

   Carboxymethyl cellulose (CMC) is a versatile component widely used in various products ranging from food to personal care and pharmaceuticals. It is a derivative of cellulose, which is a natural polymer present in plant cell walls. CMC is generated by treating cellulose with chloroacetic acid and introducing carboxymethyl groups onto the cellulose backbone.
    One of the main characteristics of CMC is that it can form a viscous gel when mixed with water. This makes it a valuable thickener in various applications, such as in food products such as ice cream, sauces, and salad dressings. CMC can also be used as a stabilizer for dairy beverages and frozen desserts, helping to prevent ingredient separation.
    In addition to its thickening and stabilizing properties, CMC is also a commonly used emulsifier. This means it can help mix typically mutually exclusive components such as oil and water together. This makes CMC an essential ingredient in products such as mayonnaise and margarine.

- Chemical structure: The hydroxyl group (-OH) on the glucose unit of cellulose is replaced by a carboxymethyl group (-CH₂COOH), and the degree of substitution (DS) is usually 0.6~1.2.
- Solubility: Easily soluble in water, insoluble in organic solvents (such as ethanol, acetone).
- Solution properties:
- High viscosity (depending on molecular weight and degree of substitution).
- pH stability: Stable in the pH range of 3~12, and precipitation may occur if the acid is too strong (pH < 3).
- Salt resistance: May gel under the influence of high-valent metal ions (Ca²⁺, Al³⁺).
- Biocompatibility: non-toxic, non-irritating, biodegradable (but the degradation rate is slow).

    The storage conditions for CMC cellulose usually require a cool, dry, and ventilated place, avoiding direct sunlight and high temperatures. Specifically, it should be stored in an environment of 2-8 ° C and avoid contact with water or moisture to prevent clumping or dissolution. In addition, to maintain its performance, contact with strong oxidants should be avoided.

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