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Rosin (/ ˈ r ɒ z ɪ n /), also known as colophony or Greek pitch (Latin: pix graeca), is a resinous material obtained from pine trees and other plants, mostly conifers. The primary components of rosin are diterpenoids, i.e., C 20 carboxylic acids. Rosin consists mainly of resin acids, especially abietic acid. [1]
Pimaric acid is a carboxylic acid that is classified as a resin acid. It is a major component of the rosin obtained from pine trees. [1] [2] When heated above 100 °C, pimaric acid converts to abietic acid, which it usually accompanies in mixtures like rosin. It is soluble in alcohols, acetone, and ethers. The compound is colorless, but almost ...
Resin acid refers to any of several related carboxylic acids found in tree resins. Nearly all resin acids have the same basic skeleton: three fused rings having the empirical formula C 19 H 29 COOH. Resin acids occur in nature as tacky, yellowish gums consisting of several compounds. They are water-insoluble. A common resin acid is abietic acid ...
Levopimaric acid is an abietane-type of diterpene resin acid. [1] It is a major constituent of pine oleoresin with the chemical formula of C 20 H 30 O 2.In general, the abietene types of diterpene resin acid have various biological activities, such as antibacterial, cardiovascular and antioxidant.
The term terpene was coined in 1866 by the German chemist August Kekulé to denote all hydrocarbons having the empirical formula C 10 H 16, of which camphene was one. Previously, many hydrocarbons having the empirical formula C 10 H 16 had been called "camphene", but many other hydrocarbons of the same composition had different names.
Pitch produced from petroleum may be called bitumen or asphalt, while plant-derived pitch, a resin, is known as rosin in its solid form. Tar is sometimes used interchangeably with pitch, but generally refers to a more liquid substance derived from coal production, including coal tar, or from plants, as in pine tar. [2]
[1] [2] The name originated as an anglicization of the Swedish tallolja ('pine oil'). [3] Tall oil is the third largest chemical by-product in a kraft mill after lignin and hemicellulose; the yield of crude tall oil from the process is in the range of 30–50 kg / ton pulp. [4] It may contribute to 1.0–1.5% of the mill's revenue if not used ...
Abietic acid is considered a "nonhazardous natural substance" in tall oil ("liquid rosin"). [4] In the U.S., abietic acid is listed in the inventory of the Toxic Substances Control Act. Abietic acid is the primary irritant in pine wood and resin. As a contact allergen [8] it is the cause of abietic acid dermatitis.