Sodium carboxyl methylstarch

Product Details

CasNo： 9063-38-1

MF： C2H4O3·xNa·x

Appearance： powder

Delivery Time： 15 days

Packing： 25kg/bag

Purity： 99%

• Basic Information
  • Alias: Carboxymethyl starch sodium, CMS - Na.
  • Chemical Formula: C10H19O8Na.
  • CAS Registry Number: 9063 - 38 - 1.
• Physical and Chemical Properties
  • Appearance: White or off - white powder.
  • Odor and Taste: Odorless and tasteless.
  • Solubility: It can be dispersed in water to form a viscous colloidal solution, and is insoluble in ethanol or ether.
  • Stability: The aqueous solution is relatively stable in alkali, but poor in acid, generating free acid insoluble in water and reducing the viscosity. When the aqueous solution is heated at above 80°C for a long time, the viscosity will also decrease.
• Category and Function
  • Pharmaceutical Excipient: It is mainly used as a disintegrant and filler. It can be used in direct - compression tablets or wet - granulation tablets. Usually, the dosage in tablets is 2% - 8%, and the optimal content is 4%. It achieves rapid and significant swelling by quickly absorbing water, thus playing a disintegrating role. It is less affected by hydrophobic excipients (such as lubricants), and increasing the tableting pressure seems to have no effect on the disintegration time. It can also be used as a suspending agent.
  • Food Additive: In the food industry, it is used as a thickener, stabilizer, suspending agent, emulsifier, etc. It is widely used in products such as milk, beverages, frozen foods, fast - food, pastries, and syrups. It can also improve the freshness and acid resistance of food.
  • Other Industrial Uses: In the construction industry, it is used as a thickening and water - retaining agent for putty powder and latex paint; in the ceramic industry, it is used as a plasticizer for green bodies; in the daily - chemical industry, it can be used as a stabilizer in detergent formulas; in the petroleum industry, it is used as a mud stabilizer and water - retaining agent; in the printing and dyeing industry, it is used as a carrier paste for dyes and printing auxiliaries.
• Preparation Methods
  • Aqueous Medium Method: Using water as the reaction medium, starch undergoes a carboxymethylation reaction with sodium chloroacetate under alkaline conditions.
  • Solvent Method: Using an organic solvent as the reaction medium, the water content in the reaction system is low, and the reaction efficiency is high. However, the amount of organic solvent used is large, the production cost is high, and it is easy to pollute the environment.
  • Dry Method: The reaction conditions are mild, the energy consumption is low, and the operation is simple. But the reaction is not uniform, the substituents are mostly distributed on the surface of starch particles, the average degree of substitution is not high, the utilization rate of raw materials is low, and the product performance is unstable.
  • Semi - dry Method: Combining some characteristics of the dry method and the aqueous medium method, an appropriate amount of water and organic solvent are added during the reaction process, so that the reaction can be carried out under relatively mild conditions and improve the uniformity of the reaction and the performance of the product.
• Relevant Standards
  • Acidity and Alkalinity: Type A is 5.5 - 7.5, Type B is 3.0 - 5.0, and Type C and Type D are 5.5 - 7.5.
  • Sodium Chloride: Type A, Type B, and Type D should not exceed 6.0%, and Type C should not exceed 1.0%.
  • Loss on Drying: Type A, Type B, and Type D should not exceed 10.0%, and Type C should not exceed 7.0%.
  • Content: The sodium content of Type A is 2.8% - 4.2%, Type B is 2.0% - 3.4%, Type C is 2.8% - 5.0%, and Type D is 2.0% - 4.0%.
• Safety Information
  • Toxicity: It is generally considered non - toxic and harmless. However, long - term and large - scale intake may have adverse effects on the digestive system, such as diarrhea and abdominal distension, and may also affect the body's absorption of minerals such as calcium and iron.
  • Compatibility Taboos: It has a compatibility taboo with ascorbic acid.