Glycerine Mono Stearate (GMS)

Glycerol monostearate, commonly known as GMS, is an organic molecule used as an emulsifier.[1] GMS is a white, odorless, and sweet-tasting flaky powder that is hygroscopic. It is a glycerol ester of stearic acid. It occurs naturally in the body as a product of the breakdown of fats by pancreatic lipase, and is also found in fatty foods.

GMS is a food additive used as a thickening, emulsifying, anti-caking, and preservative agent; an emulsifying agent for oils, waxes, and solvents; a protective coating for hygroscopic powders; a solidifier and control release agent in pharmaceuticals; and a resin lubricant. It is also used in cosmetics and hair care products.

GMS is largely used in baking preparations to add "body" to the food. It is responsible for giving ice cream and whipped cream its smooth texture. It is sometimes used as an anti-staling agent in bread.

Parameter Value

CAS Number

123-94-4 

Chemical formula

C21H42O4

Molar mass

358.56 g·mol−1

Appearance

White to yellowish solid

Density

0.97 g/cm3

Melting point

58 to 59 °C (136 to 138 °F; 331 to 332 K)

Boiling point

238 to 239 °C (460 to 462 °F; 511 to 512 K)

Solubility in water

Insoluble

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