Ethyl Cellulose – Jecfa Specification

 Prepared at the 26th JECFA (1982), published in FNP 25 (1982) and FNP 52 (1992). Metals and arsenic specifications revised at the 57th JECFA (2001). A group ADI ‘not specified’ was established at the 35th JECFA (1989).
DEFINITIONEthyl ether of cellulose, prepared from wood pulp or cotton by treatment with alkali and ethylation of the alkali cellulose with ethyl chloride. The article of commerce can be specified further by viscosity.
Chemical namesCellulose ethyl ether, ethyl ether of cellulose
C.A.S. number9004-57-3
AssayNot less than 44% and not more than 50% of ethoxyl groups (-OC2H5) on the dried basis (equivalent to not more than 2.6 ethoxyl groups per anhydroglucose unit).
DESCRIPTIONFree-flowing, white to light tan powder
FUNCTIONAL USESTableting aid, binder, filler, diluent of colour and other food additives
SolubilityPractically insoluble in water, in glycerol, and in propane-1,2-diol, but soluble in varying proportions in certain organic solvents, depending upon the ethoxyl content. Ethyl cellulose containing less than 46-48% of ethoxyl groups is freely soluble in tetrahydrofuran, in methyl acetate, in chloroform, and in aromatic hydrocarbon ethanol mixtures. Ethylcellulose containing 46-48% or more of ethoxyl groups is freely soluble in ethanol, in methanol, in toluene, in chloroform, and in ethyl acetate.
Film forming testDissolve 5 g of the sample in 95 g of an 80:20 (w/w) mixture of toluene-ethanol. A clear, stable, slightly yellow solution is formed. Pour a few ml of the solution onto a glass plate, and allow the solvent to evaporate. A thick, tough continuous, clear film remains. The film is flammable.
pHNeutral to litmus (1 in 20 suspension)
Loss on dryingNot more than 3% (105o, 2 h)
Sulfated ashNot more than 0.4%Test 1 g of the sample (Method I)
LeadNot more than 2 mg/kgDetermine using an atomic absorption technique appropriate to the specified level. The selection of sample size and method of sample preparation may be based on the principles of the method described in Volume 4, “Instrumental Methods.”
METHOD OF ASSAYDetermine the ethoxyl content as directed under Ethoxyl and Methoxyl Group Determination (see Volume 4).