Sodium Carboxymethyl Cellulose Pdf

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No layer of foam appears. This test distinguishes sodium carboxymethyl cellulose from other cellulose ethers and from alginates and natural gums. Precipitate formation To 5 ml of an 0.5% solution of the sample add 5 ml of a 5% solution of copper sulfate or of aluminium sulfate. A precipitate appears.

Carboxymethyl cellulose
Names
Other names
Identifiers
ChEBI	CHEBI:85146
ChEMBL
ChemSpider	none
ECHA InfoCard	100.120.377
E number	E466 (thickeners, ..)
UNII
Properties
variable
Molar mass	variable
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
verify (what is ?)
Infobox references

Carboxymethyl cellulose (CMC) or cellulose gum^[1] is a cellulosederivative with carboxymethyl groups (-CH₂-COOH) bound to some of the hydroxyl groups of the glucopyranosemonomers that make up the cellulose backbone. It is often used as its sodium salt, sodium carboxymethyl cellulose. It used to be marketed under the name Tylose, a registered trademark of SE Tylose.

2Uses

Preparation[edit]

It is synthesized by the alkali-catalyzedreaction of cellulose with chloroacetic acid.^[2] The polar (organic acid) carboxyl groups render the cellulose soluble and chemically reactive.

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Following the initial reaction, the resultant mixture produces about 60% CMC plus 40% salts (sodium chloride and sodium glycolate). This product is the so-called technical CMC which is used in detergents. A further purification process is used to remove these salts to produce the pure CMC used for food, pharmaceutical, and dentifrice (toothpaste) applications. An intermediate 'semipurified' grade is also produced, typically used in paper applications such as restoration of archival documents.

The functional properties of CMC depend on the degree of substitution of the cellulose structure (i.e., how many of the hydroxyl groups have taken part in the substitution reaction), as well as the chain length of the cellulose backbone structure and the degree of clustering of the carboxymethyl substituents.

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Uses[edit]

CMC is used in food under the E number E466 or E469 (when it is enzymatically hydrolyzed) as a viscosity modifier or thickener, and to stabilizeemulsions in various products including ice cream. It is also a constituent of many non-food products, such as toothpaste, laxatives, diet pills, water-based paints, detergents, textile sizing, reusable heat packs, and various paper products. It is used primarily because it has high viscosity, is nontoxic, and is generally considered to be hypoallergenic as the major source fiber is either softwood pulp or cotton linter.^[3]^[4] CMC is used extensively in gluten free and reduced fat food products.^[5] In laundry detergents, it is used as a soil suspension polymer designed to deposit onto cotton and other cellulosic fabrics, creating a negatively charged barrier to soils in the wash solution. CMC is used as a lubricant in artificial tears.

CMC is also used as a thickening agent, for example, in the oil-drilling industry as an ingredient of drilling mud, where it acts as a viscosity modifier and water retention agent. Sodium CMC(Na CMC) for example, is used as a negative control agent for alopecia in rabbits.

Knitted fabric made of cellulose (e.g. cotton or viscose rayon) may be converted into CMC and used in various medical applications.^{[citation needed]}

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Device for epistaxis (nose bleeding). A poly-vinyl chloride (PVC) balloon is covered by CMC knitted fabric reinforced by nylon. The device is soaked in water to form a gel, this is inserted into the nose and the balloon inflated. The combination of the inflated balloon and the therapeutic effect of the CMC stops the bleeding.
Fabric used as a dressing following ear nose and throat surgical procedures.
Water is added to form a gel, and this gel is inserted into the sinus cavity following surgery.

Insoluble microgranular CMC is used as a cation-exchange resin in ion-exchange chromatography for purification of proteins.^[6] Presumably, the level of derivatization is much lower, so the solubility properties of microgranular cellulose are retained, while adding sufficient negatively charged carboxylate groups to bind to positively charged proteins.

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CMC is also used in ice packs to form a eutectic mixture resulting in a lower freezing point, and therefore more cooling capacity than ice.^[7]

Aqueous solutions of CMC have also been used to disperse carbon nanotubes. The long CMC molecules are thought to wrap around the nanotubes, allowing them to be dispersed in water. In conservation-restoration, it is used as an adhesive or fixative (commercial name Walocel, Klucel).

CMC is used to achieve tartrate or cold stability in wine. This innovation may save megawatts of electricity used to chill wine in warm climates. It is more stable than metatartaric acid and is very effective in inhibiting tartrate precipitation. It is reported that KHT crystals, in presence of CMC, grow slower and change their morphology.^[8] Torrent numb3rs season 6 teen wolf. Their shape becomes flatter because they lose 2 of the 7 faces, changing their dimensions. CMC molecules, negatively charged at wine pH, interact with the electropositive surface of the crystals, where potassium ions are accumulated. The slower growth of the crystals and the modification of their shape are caused by the competition between CMC molecules and bitartrate ions for binding to the KHT crystals (Cracherau et al. 2001).

In veterinary medicine, CMC is used in abdominal surgeries in large animals, particularly horses, to prevent the formation of bowel adhesions.

CMC is sometimes used as an electrode binder in advanced battery applications (i.e. lithium ion batteries), especially with graphite anodes. CMC's water solubility allows for less toxic and costly processing than with non-water soluble binders, like the traditional polyvinylidene fluoride (PVDF), which requires toxic n-methylpyrrolidone (NMP) for processing. CMC is often used in conjunction with styrene-butadiene rubber (SBR) for electrodes requiring extra flexibility, e.g. for use with silicon-containing anodes.^[9]

Culinary uses[edit]

CMC powder is widely used in the ice cream industry, to make ice creams without churning or extreme low temperatures, thereby eliminating the need for the conventional churners or salt ice mixes.^[10] CMC is used in preparing bakery products such as bread and cake. The use of CMC gives the loaf a much improved quality at a reduced cost to the baker, by economizing on the fat component. CMC is also used as an emulsifier in high quality biscuits. By dispersing fat uniformly in the dough, it improves the release of the dough from the moulds and cutters, achieving well-shaped biscuits without any distorted edges. It can also help to reduce the amount of egg yolk or fat used in making the biscuits, thus achieving economy. Use of CMC in candy preparation ensures smooth dispersion in flavour oils, and improves texture and quality. CMC is used in chewing gums, margarines and peanut butter as an emulsifier. It is also used in leather crafting to burnish the edges.^[11]

Enzymology[edit]

CMC has also been used extensively to characterize enzyme activity from endoglucanases (part of the cellulase complex). CMC is a highly specific substrate for endo-acting cellulases, as its structure has been engineered to decrystalize cellulose and create amorphous sites that are ideal for endoglucanase action. CMC is desirable because the catalysis product (glucose) is easily measured using a reducing sugar assay, such as 3,5-dinitrosalicylic acid. Using CMC in enzyme assays is especially important in regard to screening for cellulase enzymes that are needed for more efficient cellulosic ethanol conversion. However, CMC has also been misused in earlier work with cellulase enzymes, as many had associated whole cellulase activity with CMC hydrolysis. As the mechanism of cellulose depolymerization has become better understood, exo-cellulases are dominant in the degradation of crystalline (e.g. Avicel) and not soluble (e.g. CMC) cellulose.

Adverse reactions[edit]

While thought to be uncommon, case reports of severe reactions to carboxymethyl cellulose exist. In one such instance, a woman was known to experience anaphylaxis following exposure.^[12] Skin testing is believed to be a useful diagnostic tool for this purpose.^[12]

Effects on inflammation, microbiota-related metabolic syndrome, and colitis are a subject of research.^[13]

Sodium Carboxymethyl Cellulose Eye Drops

Sodium Carboxy Methyl Cellulose Cmc

References[edit]

^Codex Alimentarius Commission (2016). 'Sodium carboxymethyl cellulose (Cellulose gum)'. GFSA Online. FAO.
^Hollabaugh, C.B.; Burt, Leland H.; Walsh, Anna Peterson (October 1945). 'Carboxymethylcellulose.. Uses and Applications'. Industrial and Engineering Chemistry. 37 (10): 943–947. doi:10.1021/ie50430a015.
^'CP Kelco Cellulose Gum / Carboxymethyl Cellulose'.
^'Sodium Carboxymethylcellulose - The Ideal Hydrocolloid for Bakery & Dough Products'(PDF). Archived from the original(PDF) on 2015-06-26.
^Stanford, John (January 2012). 'Food Processing Technologies for Reduction of Fat in Products'(PDF). Food & Health Innovation Service. Scotland Food & Drink. Archived from the original(PDF) on 2014-10-23.
^'Whatman Filters & Sample Collection'. Retrieved 9 November 2016.
^Use in ice packsArchived July 8, 2011, at the Wayback Machine
^Gerbaud, Vincent (18 October 1996). Determination de l'etat de sursaturation et effet des polysaccharides sur la cristallisation du bitartrate de potassium dans les vins [Determination of the state of supersaturation and effect of polysaccharides on the crystallization of potassium bitartrate in wines] (PDF) (Ph.D.) (in French). Institut National Polytechnique de Talouse. Docket 961NP1030G. Retrieved 2017-05-07.
^[1] Applications of sodium carboxymethyl cellulose As a Binder In Batteries
^Bahramparvar, Maryam; Mazaheri Tehrani, Mostafa (3 March 2011). 'Application and Functions of Stabilizers in Ice Cream'(PDF). Food Reviews International. 27 (4): 389–407. doi:10.1080/87559129.2011.563399.
^'C.m.c. Glossary - Recipes with C.m.c. - Tarladalal.com'. Retrieved 9 November 2016.
^ ^a^bLieberman, Phil. 'Anaphylaxis to carboxymethylcellulose'. American Academy of Allergy, Asthma, and Immunology. Archived from the original on 2017-07-12. Retrieved 2017-07-12.
^Healy, Melissa (2015-02-25). 'Is common food additive to blame for rising rates of bowel disease?'. Los Angeles Times. Archived from the original on 2017-07-12. Retrieved 2017-07-12.

Is Sodium Carboxymethyl Cellulose Safe

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