Citation: JIN Jing, CHEN Jiping, TIAN Yuzeng, ZOU Lili, WANG Longxing, LI Fang. Determination of undecanoic acid and 13-methyl-tetradecanoic acid connected to the glyceride with internal standard method and its application to the identification of adulteration of illegal cooking oil[J]. Chinese Journal of Chromatography, ;2013, 31(6): 556-560. doi: 10.3724/SP.J.1123.2012.12036 shu

Determination of undecanoic acid and 13-methyl-tetradecanoic acid connected to the glyceride with internal standard method and its application to the identification of adulteration of illegal cooking oil

1.
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China

Corresponding author: CHEN Jiping,
Received Date: 20 December 2012
Available Online: 20 January 2013
Fund Project: 国家自然科学基金项目(21205117). (21205117)

On the basis of the source of illegal cooking oil (heated vegetable oil and animal oil) and the important referents reflecting their sources, namely, undecanoic acid and 13-methyl-tetradecanoic acid connected to the glyceride, their corresponding ramifications in edible oil were detected with internal standard method. The sensitivity and selectivity of this method were improved by the on-line cleanup and preconcentration. The detection limits of the method were 0.070 mg/kg for undecanoic acid and 0.006 mg/kg for 13-methyl-tetradecanoic acid. Additionally, most of the normal vegetable oils have lower levels of both fatty acids than illegal cooking oils. It was suggested to evaluate the quality of edible oils to some extent on the basis of the contents of undecanoic acid and 13-methyl-tetradecanoic acid.
- multidimensional gas chromatography-mass spectrometry (MDGC-MS),
- internal standard,
- undecanoic acid,
- 13-methyl-tetradecanoic acid,
- odd-chain fatty acids,
- illegal cooking oil
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