|  |
 CMC Carboxymethyl Cellulose |
Each anhydroglucose unit contains three hydroxyl groups, shown in white. By substituting carboxymethyl groups for some of the hydrogens of these hydroxyls, as shown in Figure 1, sodium carboxymethylcellulose is produced. The average number of hydroxyl groups substituted per anhydroglucose unit is known as the “degree of substitution,” DS. If all three hydroxyls are replaced, the maximum theoretical DS of 3.0 (impossible in practice) results.
Idealized Unit Structure of CMC, with a DS of 1.0
|
Optimum water solubility and other desirable physical properties of CMC are obtained at a much lower degree of substitution than 3. The most widely used types of WekceloCMC have a DS of 0.7 . V
CMC solution characteristics depend on the degree of polymerization (DP) as well as the degree of substitution. Average chain length and degree of substitution determine molecular weight of the polymer. As molecular weight increases, the viscosity of CMC solutions increases rapidly. |
WeKcelo CMC has a minimum purity of 99.5%. it has the following functions and properties:
- Control Viscosity and rheology
- Suspending and binding rheology
- Water retention aid
- Crystal growth inhibitor
- Strong ,resistant film former ?
|
These properties and functions make it suitable for use in a broad range of applications in the food, pharmaceutical, cosmetic, paper, and other industries. Various types based on carboxymethyl substitution, viscosity, particle size, and other parameters. |
Degree of Substitution
WeKcelo CMC is produced with the following degrees of substitution: |
Type |
Substitution Range (a) |
Sodium Content, % |
7 |
0.65-0.85 |
7.0-8.9 |
9 |
0.80-1.10 |
8.1-9.2 |
12 |
1.15-1.45 |
10.5-12.0 |
Viscosity Type |
Factor |
Concentration, % |
High |
1,000 |
1 |
Medium |
100 |
2 |
Low |
10 |
2 |
Table - Some Types of WeKcelo CMC |
| |
Designations for Indicated Substitution Types |
| Viscosity Range at 25°C, (c) cps (mPas) |
7 |
9 |
12 |
High—at 1% Concentration
|
|
|
|
2,500-6,000 |
7H5 |
|
|
1,000-2,800 |
7H2 |
9H2 |
|
1,500-3,000 |
7H2 |
|
|
Medium—at 2% Concentration |
10 |
2 |
|
800-3,100 |
|
|
|
1,500-3,100 |
|
|
12M20 |
400-800 |
7M5 |
9M2 |
|
200-800 |
7M5 |
9M5 |
12M5 |
100-200 |
7M2 |
|
|
Low (d) —at 2% Concentration |
|
|
|
25-50 |
7L3 |
|
|
|
Major application for WeKcelo CMC:
- Pharmaceutical preparation
- Cosmetics and personal care products
- Toothpaste
- Food : Frozen dairy products ,pet food , bakery products , beverages ,low calorine food , instant products,salad dressings .
- Ceramic
- Oil field
- Construction
|
Microbiological Information for Use in Foods, Drugs, Cosmetics, and Toiletries
Microbiological Information
WeKceloCMC is routinely sampled and subjected to microbiological testing by an independent laboratory and data are tabulated to provide an ongoing indicator of control in production. The data generated are not intended to be used to provide product specifications, but typical results using our standard protocol, are shown below.
| Aerobic plate count, cfu/g |
<100 |
| Mold, cfu/g |
<100 |
| Yeast, cfu/g |
<100 |
| Coliforms, MPN/g |
<30 |
| E. coli/10 g |
negative |
| Staphylococcus aureus/10 g |
negative |
| Salmonella/25 g |
negative |
| Pseudomonas/10 g |
negative |
|
|
|
