E313

E313
Name	Ethyl cellulose (E313)
Other names	Ethylcellulose; Ethyl cellulose (E313)
Iupac name	Cellulose, ethyl ether
Cas number	9004-57-3
Formula	(C6H10O5)n (partially ethylated)
Molar mass	variable
Density	~1.15 g/cm3
Solubility	Insoluble in water; soluble in organic solvents

E313 is a designation commonly encountered in additive coding systems for food and pharmaceuticals referring to a cellulose-derived ether used as a film former, binder, stabilizer, and coating agent. It is related to a family of cellulose ethers that have been modified by substitution with ethyl groups and is used across industries including food processing, pharmaceuticals, cosmetics, and industrial coatings. The material combines traits of polymers derived from plant polysaccharides with processing behavior adapted for Nestlé, Unilever, Pfizer, Johnson & Johnson, and other manufacturers’ formulations.

Identification and Nomenclature

The term appears alongside systematic names such as ethyl cellulose and commercial trademarks owned by companies like Dow Chemical Company, Ashland Inc., Merck Group, and DuPont. Alternate identifiers include CAS registry numbers and supplier catalog entries used by Sigma-Aldrich, FMC Corporation, and BASF. In pharmacopeial contexts the substance is referenced in standards published by organizations such as the European Pharmacopoeia, United States Pharmacopeia, and national regulatory agencies including Food and Drug Administration and European Commission guidance documents. Industry datasheets often list degrees of substitution and viscosity grades connected to suppliers like AkzoNobel and Celanese.

Chemical Properties and Structure

Ethyl cellulose is derived from the parent biopolymer cellulose through Williamson etherification to yield ethyl ether linkages on the anhydroglucose repeat units. Structural descriptors reference the degree of ethoxyl substitution and the polymer chain length; these parameters influence physical properties like glass transition temperature and film-forming behavior. Typical analytical techniques used to characterize the material include nuclear magnetic resonance (NMR) as employed in laboratories at Harvard University, ETH Zurich, and MIT; gel permeation chromatography used by research groups at Max Planck Institute; and Fourier-transform infrared spectroscopy common in quality control at GlaxoSmithKline and Roche. The material is hydrophobic relative to parent cellulose and displays solubility in organic solvents such as ethanol, toluene, and acetic acid, a property exploited by formulators at L’Oréal, Procter & Gamble, and Estée Lauder.

Synthesis and Production=

Commercial production typically involves alkaline activation of cellulose sourced from wood pulp or cotton by manufacturers like International Paper and Suzano Papel e Celulose, followed by reaction with ethyl chloride or ethyl sulfate under controlled conditions—processes developed and scaled by chemical engineering departments at Imperial College London and industrial R&D groups at Bayer. Process control monitors degree of substitution and molecular weight distribution via methods standardized by ASTM International technical committees and industrial partners including Siemens instrumentation. Environmental and process safety practices implemented by producers reference guidance from agencies such as Occupational Safety and Health Administration and European Chemicals Agency; large producers often operate continuous reactors and solvent recovery systems similar to those used at Shell and ExxonMobil plants.

Applications and Uses

Ethyl cellulose serves as a film former and binder in pharmaceutical tablet coatings developed by formulators at Pfizer and Novartis; as a viscosity modifier and stabilizer in food products marketed by Kellogg Company and Mondelez International; and as a matrix material for controlled-release systems studied at Johns Hopkins University and UCSF. In cosmetics it is used by Shiseido and Revlon to modify texture and film properties in mascaras and nail polishes; in paints and inks it is used by Sherwin-Williams and Canon for rheology control and adhesion. Research collaborations between Stanford University and industry have explored ethyl cellulose for microencapsulation of flavors and fragrances for companies like Givaudan and IFF. Its thermal and mechanical properties have led to experimental uses in additive manufacturing and composite formulations examined at MIT Media Lab and Lawrence Berkeley National Laboratory.

Safety and Toxicology

Toxicological profiles compiled by agencies such as World Health Organization, European Food Safety Authority, and Food and Agriculture Organization indicate low acute oral toxicity and minimal systemic absorption due to high molecular weight and poor water solubility; this finding underpins approvals by regulators including Food and Drug Administration for specified uses. Occupational exposure limits and handling recommendations are provided by OSHA and NIOSH; industrial hygiene monitoring programs at manufacturers like Dow and BASF implement dust control and respiratory protection. Allergenicity and sensitization reports are rare, though safety data sheets from suppliers such as Merck and Sigma-Aldrich recommend eye and skin contact precautions. Chronic studies referenced in reviews prepared by European Chemicals Agency committees evaluate biodegradation and environmental persistence relative to other cellulose derivatives.

Regulatory Status and Standards

Ethyl cellulose is listed in international food additive codices and pharmacopeias and is permitted for specific applications and maximum use levels set by regulatory bodies including European Commission, FDA, and national ministries of health in Japan and Canada. Standards for identity, purity, and testing protocols are published by International Organization for Standardization committees and in monographs by United States Pharmacopeia and European Pharmacopoeia, with additional guidance from Codex Alimentarius. Trade associations such as the Cellulose Ether Producers Association and chemical consortia coordinate voluntary standards and good manufacturing practice guidance used by companies like Nippon Paper Industries and Sappi.

Category:Cellulose ethers