Ester

Definition and stakes

Alice A. Ball,  The Chemical Constituents of Piper Methysticum (1915)

“ The crystalline product consists, largely of methysticin, the methyl ester of methysticinic acid. In addition to this there is about five percent of the free methysticinic acid present.
The resinous product consists of about five percent of free resinous acids, which acids can be separated into three different acids or groups of acids according to their solubility in the different alkalies. The remaining resinous product is composed of ester resins. On hydrolysis these esters yield three distinct acids, two resinous acids and methysticinic acid.
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Source: Gutenberg

Alice A. Ball,  The Chemical Constituents of Piper Methysticum (1915)

“ The potassium salts of the various resin acids formed by the saponification of the ester resins should yield a resinous mass syrupy or oily in consistency when acidified, if it consists entirely of the two groups of acids spoken of as the iron acids and the barium acids. Also the weight of the barium acids plus the weight of the iron acids should nearly equal the weight of the ester resins, if these are the only two acids, because the alcohol radicals constitute not more than two percent of the ester resins. ”
Source: Gutenberg

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