Glycerol ester of wood rosin

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Glycerol ester of wood rosin, also known as glyceryl abietate or ester gum, is an oil-soluble food additive (E number E445). The food-grade material is used in foods, beverages, and cosmetics to keep oils in suspension in water.[1] It is also used as an ingredient in the production of chewing-gum and ice cream. Similar, less pure materials (glycerol ester of gum rosin) are used as a component of certain low-cost adhesives[2]

To make the glycerol ester of wood rosin, refined wood rosin is reacted with glycerin to produce the glycerol ester. This results in a fragrant, "warm" tasting, sweet substance (around 0.6 times that of cane sugar).[3]

Glycerol ester of wood rosin is an alternative to brominated vegetable oil in citrus oil-flavored soft drinks. In some cases both ingredients are used together.


  1. ^ WHO Food Additives Series 35: 836. Glycerol ester of wood rosin
  2. ^ Rosin Resins
  3. ^ Ruth Winter, M.S. (2009). A Consumer's Dictionary of Food Additives, 7th Edition. New York: Three Rivers Press. 

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