Methyl cellulose

It is a kind of methyl ether of cellulose. It is white or pale yellow or light gray small particles (95% through a 40 mesh sieve), filaments like or powder. It is odorless, tasteless and has hygroscopicity with an apparent density of 0.3~0.7g/mL.When all the R in the structure is methyl, the substitution degree is equal to 3, and the methoxy content is 45.57%. For methylcellulose used as the food additive, the methoxy content should be around 26%~33% which corresponds to a degree of substitution of 1.7 to 2.2. When the substitution degree is lower than 1.3, it can be dissolved in alkaline. While methylcellulose with substitution degree higher than 2.6 is soluble in an organic solvent. When the degree of substitution is less than 1.3, it can be dissolved in alkali; for those with substitution degree higher than 2.6, it is soluble in organic solution. At the range between 1.3 and 2.6, it is soluble in cold water, pyridine, aniline, trimethyl formamide, benzyl alcohol and acetic acid.Aqueous solution is stable at neutral and room temperature; but it can generate gelation effect and be precipitated at high temperature. Gelation temperature is dependent on the absolute viscosity and concentration of the solution; solution of large viscosity and high concentration has a relative low gelling temperature. In the presence of inorganic salts, viscosity can be increased. Due to that it belongs to a non-ionic solution, the polyvalent metal is not able to precipitate it; Gelation will only occur when the concentration of the electrolyte and other dissolved substances exceeds a certain limit.Aqueous solution has surfactant activity and dried to form a thin film; upon heating and cooling, it will orderly go through the reversible transition from the sol to gel.
white powder or (often) 2% solution in water, properties
Methylcellulose occurs as a white, fibrous powder or granules. It is practically odorless and tasteless. It should be labeled to indicate its viscosity type (viscosity of a 1 in 50 solution).
Methyl cellulose is a water soluble, gel-like substance with no odor and no taste.
Odorless white or creamy white fibrous powder. Tasteless.