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angelic acid
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Angelic acid is a monocarboxylic unsaturated organic acid. It is mostly found in the plants of the family Apiaceae. German pharmacist Ludwig Andreas Buchner isolated angelic acid in 1842 from the roots of garden angelica (''Angelica archangelica'') which gave the acid its name. Angelic acid is a volatile solid with a biting taste and pungent sour odor. It is the ''trans'' isomer of 2-methyl-2-butenoic acid, which easily converts to the ''cis'' isomer, tiglic acid, upon heating or reaction with inorganic acids. The reverse transformation occurs much less readily. The salts and esters of angelic acid are called angelates. Angelic acid esters are the active components of herbal medicine used against a wide range of various health disturbances including pains, fever, gout, heartburn, etc.
==Name and discovery==
Angelic acid was first isolated by the German pharmacist Ludwig Andreas Buchner (1813–1897) in 1842 from the roots of the garden plant angelica (''Angelica archangelica'') that gave the acid its name.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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