FOOD SCIENCE ›› 2013, Vol. 34 ›› Issue (8): 199-201.doi: 10.7506/spkx1002-6630-201308042

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Identification of Drainage Oil Based on Palmitoleic Acid and Methacrolein

LI Tao,ZHU Xiao-hong,SHENG Xi-xia,LIU Hai-jing,YANG Zhi-hai   

  1. 1. Shaanxi Institute for Food And Drug Control, Xi’an 710061, China;2. Institute of Industrial Hygiene of Ordnance Industry, Xi’an 710065, China
  • Received:2012-11-28 Revised:2013-02-25 Online:2013-04-25 Published:2013-05-07
  • Contact: Tao LI E-mail:westyx@126.com

Abstract: This study was conducted to find out specific indicators for discriminating drainage oil from edible oil. For this purpose, tow approaches were proposed: one was analysis of fatty acid composition following sample saponification, and the other was methyl esterification and direct enrichment by headspace sampling method and GC-MS analysis of volatile components in samples. Results revealed that palmitoleic acid and methacrolein showed strong specificity in drainage oil. In the studied samples, using palmitoleic acid alone for identification, the overall correct detection rate was 54.1%, the correct detection rate of positive samples was 100%, the false negative rate was 60.7%, and the correct detection rate of negative samples was 100%. When using methacrolein along, the overall correct detection rate was 78.4%, the correct detection rate of positive samples was 100% and the false negative rate was 28.6%, and the correct detection rate of negative samples was 100%. However, when combining palmitoleic acid and methacrolein together, the overall correct detection rate was 86.5%, the correct detection rate of positive samples was 100%, the false negative rate was 17.9% and the correct detection rate of negative samples was 100%. Therefore, the combined application of palmitoleic acid and methacrolein were proposed as specific indicators in differentiating drainage oil. The two-way methods could be mutual validated, of overall judgment, and identify the drainage oil and the edible oil more accurately.

Key words: drainage oil, edible oil, palmitoleic acid, methacrolein, gas chromatography-mass spectrometry

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