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|Section2= |Section3= |Section4= |Section7= |Section8= }} Propionic acid (from the Greek words ''protos'', meaning "first", and ''pion'', meaning "fat"; also known as propanoic acid) is a naturally occurring carboxylic acid with chemical formula CH3CH2COOH. It is a clear liquid with a pungent and unpleasant smell somewhat resembling body odor. The anion CH3CH2COO− as well as the salts and esters of propionic acid are known as propionates (or propanoates). ==History== Propionic acid was first described in 1844 by Johann Gottlieb, who found it among the degradation products of sugar. Over the next few years, other chemists produced propionic acid in various other ways, none of them realizing they were producing the same substance. In 1847, the French chemist Jean-Baptiste Dumas established all the acids to be the same compound, which he called propionic acid, from the Greek words protos, meaning ''first'', and pion, meaning ''fat'', because it is the smallest H(CH2)''n''COOH acid that exhibits the properties of the other fatty acids, such as producing an oily layer when salted out of water and having a soapy potassium salt. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「propionic acid」の詳細全文を読む スポンサード リンク
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