Carboxyl methyl cellulose

Cation-exchange columns have been used effectively by some investigators for the fractionation of casein (Annan and Manson 1969 Kim et al 1969 Kopfler et al. 1969 Snoeren et al. 1977 Saito et al 1979). Sulfoethyl-Sephadex was used by Annan and Manson (1969) with formate buffer to fractionate the as-casein complex. Cellulose phosphate, carboxyl-methyl-cellulose (CMC), potassium-K-carrageenan, and sodium Amberlite CG50 columns have also been used to fractionate the caseins (Kim et al. 1969 Kopfler et al. 1969 Snoeren et al 1977). A batch method for the preparation of para-K-casein from rennin-treated whole casein has been developed with CMC Sephadex (Saito et al. 1979). 

During the experiments, contrary to the pure reactive absorption, a stationary regime is pursued. The solid mass content of the suspension is much higher than is theoretically required for sulfur dioxide absorption. Thus, the process times will be reduced and the granulation effect with overlapped reactive absorption can be achieved within a few hours. In order to achieve a better granulating effect, carboxyl methyl cellulose (CMC) was added to the suspension as a binder. 

This includes reactions of the polymer groups with metallic sites on the particle surface that may result in the formation of stable or insoluble compounds through covalent, ionic or coordination bonding. Carboxyl flocculants such as polyacrylic acid and carboxyl-methyl cellulose can chemisorb on the surface of calcite and sphalerite which have calcium or zinc sites on them. Certain flocculants, such as cellulose and starch with xanthate and polyacrylamide with dithiocarbamate with high chemically active groups, have been found to exhibit selective reaction with sulfide minerals. Such complexing polymers have been investigated for their use in selective flocculation processes. 

Piaggesi A, Baccetti F, Rizzo L, Romanelli M, Navalesi R, Benzi L. Sodium carboxyl-methyl-cellulose dressings in the management of deep ulcerations of diabetic foot. Diabet Med 2001 18 320-324. 

Carboxyl methyl cellulose (CMC) E466 Cellulose Monochloroacetic acid Drinks, dairy drinks, powdered drinks, sauces, dressings, ice cream, water ices, bakery products, low pH dairy products, cosmetics, paper, textiles, oil drilling, adhesives... 

Carboxyl Carboxyl methyl cellulose Precipitation as copper or uranyl salt 186,187... 

Many types of derivatives of cellulose have been used to prepare affinity adsorbents.51 0-(2-Aminoethyl)cellulose and 0-(carboxy-methyl)cellulose can be coupled to carbohydrates bearing carboxyl or primary amino groups by the carbodiimide method.52,53 Cellulose derivatives bearing amino groups can be coupled to reducing carbohydrates by reductive-amination reactions25 in which the Schiff base produced in the initial reaction is reduced with sodium cyanoborohy-dride.54... 

Uses Crosslinking agent for carboxylated SBR latex, carbor methyl cellulose, PVA, and other water-sol. polymers water resist, aid for starch-based adhesives and coalings food-contact paper/paperboard Regulatory FDA 21 CFR 176.170,176.180 Properties Pale amber liq. water-soL sp.gr. 1.03 vise. 50 cps f.p. -3.9 C pH 4.7 cationic 12.5% total solids Storage 100 days shelf life below 32 C Polycup 1884 [Hercules]... 

There are two general types of water-based adhesives solutions and latexes.Solutions are made from materials that are soluble only in water or in alkaline water. Examples of materials that are soluble only in water include animal glue, starch, dextrin, blood albumen, methyl cellulose, and polyvinyl alcohol. Examples of materials that are soluble in alkaline water include casein, rosin, shellac, copolymers of vinyl acetate or acrylates containing carboxyl groups, and carboxymethyl cellulose. 

Ionic polymers with carboxylic and sulfonic acid functional groups have extremely high water permeabilities. Carboxy methyl cellulose/poly-acrylic acid blends show good water permeability and excellent selectivity for water over low alcohols (Table 1). These membranes can be effectively used to dehydrate alcohols [8]. Selectivity for water over alcohol increases with decreasing polarity of the alcohol. The water fluxes can be correlated with water vapor pressure and are not a function of the nature of the alcohol. 

Ocular systems (Figure 7.5b) with application in the lower ophthalmic conjunctival sac for the controlled release of ciprofloxacin (pre- or post-operative treatment of topical infections, as well as conjimctivitis) were obtained from polyvinyl alcohol and sodium carboxymethylcellulose linking the two polymers by an esterification reaction between the hydroxyl groups of the polyvinyl alcohol and carboxyl groups of carboxy-methyl cellulose [47]. Membranes were obtained by the incorporation of the antibiotic into the polymer solution with the addition of glycerol as a plasticizer (in order to ensure the flexibility of the membrane). The advantage of using these polymers comes from their biocompatibility and from the fact that they are water soluble as the controlled release occms, the membrane is dissolved by the tear bed at 35"C temperature. 

Precipitation as the copper or uranyl salt has been used to determine carboxyl groups [12] in carboxy methyl cellulose. 

Crini et al., 2002 proposed the synthesis of cyclodextrin-carboxy-methyl cellulose gels. Results obtained with these gels showed that effective and efficient extraction of beta-naphtol is achieved. The presence of carboxyl groups in the polymer networks permit to increase significantly the sorption properties. The carboxylic acid groups present in the adsorbents plays an important role in the adsorption of Cu, Pb and Ni [94]. 

The presence of sulphonic and carboxylic groups enables the iron ions to be in the vicinity of the cellulose backbone chain. In this case, the radicals formed can easily attack the cellulose chain leading to the formation of a cellulose macroradical. Grafting of methyl methacrylate on tertiary aminized cotton using the bi-sulphite-hydrogen peroxide redox system was also investigated [58]. 

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