Improvement of saponification extraction method for fatty acids separation from geological samples |
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| Authors: | Jiang Chang Yanqing Xia Suping Ma Xuan Fang Minzhuo Sun |
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| Institution: | 1.Key Laboratory of Petroleum Resources,Gansu Province/Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou,People’s Republic of China;2.University of Chinese Academy of Sciences,Beijing,People’s Republic of China |
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| Abstract: | The conventional saponification method could result in lower recoveries and artificial changes of long-chain fatty acids. The main reason is the error judgment of the intermediate layer suspended between the aqueous and organic layer during the liquid–liquid extraction process. This study shows that the intermediate layer consists of lots of medium- to long-chain carboxylic salts for their special physical and chemical properties. An improved saponification extraction method is also developed and the results show that the carboxylic salts distributed in the intermediate layer could be obtained completely, which greatly enhances the authenticity and accuracy of fatty acid analysis. Additionally, the possible reasons of formation of the intermediate layer are also discussed. |
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