Rapid Screening for Gutter Oil Adulteration in Vegetable Oil Based on Fatty Acid Methyl Esters

doi:10.7506/spkx1002-6630-201416029

Abstract

Abstract:

A rapid screening method for adulteration of gutter oil in vegetable oils based on different forms of fatty acid
esters detected in samples was developed. The major forms of fatty acids were triglycerides in vegetable oils and fatty acid
methyl esters (FAMEs) in gutter oil. Using gas chromatography-mass spectrometry (GC-MS) in a full-scanning detection
mode, 37 kinds of fatty acid methyl esters were determined by searching against the NIST 05 standard mass spectral library.
The fatty acid methyl esters of samples were determined by direct dilution with n-hexane and GC-MS with full-scanning
analysis. Fatty acid methyl esters were not detected in 100 vegetable oil samples. Meanwhile, 14 kinds of fatty acid methyl
esters were detected in 13 (65%) out of 20 gutter oil samples, mainly including methyl myristate (C14∶0), methyl palmitate
(C16∶0) and methyl stearate (C18∶0). In addition, 70% of the 13 gutter samples were detected to simultaneously contain many
kinds of fatty acid methyl esters at higher levels. Thus, vegetable oil sample detected to contain more fatty acid methyl esters
at higher contents can be confirmed to be adulterated with gutter oil. In the case of lower or undetectable levels of fatty acid
methyl esters, other indicators or methods are needed. In conclusion, fatty acid methyl esters can be used an indicator for
rapid screening for gutter oil adulteration in vegetable oils.

Key words: fatty acid methyl esters (FAMEs), vegetable oil, gutter oil, gas chromatography-mass spectrometry (GC-MS)

CLC Number:

TS207.5

ZHAO Hai-xiang1, REN He-ling2, XU Xiu-li2, ZHANG Feng-xia2, DING Gang-dou2, YUE Fen-peng2, MA Xiao-ning2, ZHONG Wei-ke2,*. Rapid Screening for Gutter Oil Adulteration in Vegetable Oil Based on Fatty Acid Methyl Esters[J]. FOOD SCIENCE, doi: 10.7506/spkx1002-6630-201416029.

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Rapid Screening for Gutter Oil Adulteration in Vegetable Oil Based on Fatty Acid Methyl Esters

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