Dispersive Microextraction Based on “Magnetic Water” Coupled to Gas Chromatography/Mass Spectrometry for the Fast Determination of Organophosphorus Pesticides in Cold-Pressed Vegetable Oils

2013 ◽  
Vol 61 (22) ◽  
pp. 5397-5403 ◽  
Author(s):  
Qin Zhao ◽  
Qian Lu ◽  
Qiong-Wei Yu ◽  
Yu-Qi Feng
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Vegetable Oils ◽  
Organophosphorus Pesticides ◽  
Gas Chromatography Mass Spectrometry ◽  
Fast Determination ◽  
Dispersive Microextraction ◽  
Cold Pressed ◽  
Magnetic Water

Detection of Adulterated Vegetable Oils Containing Waste Cooking Oils Based on the Contents and Ratios of Cholesterol, β-Sitosterol, and Campesterol by Gas Chromatography/Mass Spectrometry

2015 ◽  
Vol 98 (6) ◽  
pp. 1645-1654 ◽  
Author(s):  
Haixiang Zhao ◽  
Yongli Wang ◽  
Xiuli Xu ◽  
Heling Ren ◽  
Li Li ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Vegetable Oils ◽  
Waste Cooking Oil ◽  
Gas Chromatography Mass Spectrometry ◽  
Quick Method ◽  
Cooking Oil ◽  
Waste Cooking Oils ◽  
Cooking Oils

Abstract A simple and accurate authentication method for the detection of adulterated vegetable oils that contain waste cooking oil (WCO) was developed. This method is based on the determination of cholesterol, β-sitosterol, and campesterol in vegetable oils and WCO by GC/MS without any derivatization. A total of 148 samples involving 12 types of vegetable oil and WCO were analyzed. According to the results, the contents and ratios of cholesterol, β-sitosterol, and campesterol were found to be criteria for detecting vegetable oils adulterated with WCO. This method could accurately detect adulterated vegetable oils containing 5% refined WCO. The developed method has been successfully applied to multilaboratory analysis of 81 oil samples. Seventy-five samples were analyzed correctly, and only six adulterated samples could not be detected. This method could not yet be used for detection of vegetable oils adulterated with WCO that are used for frying non-animal foods. It provides a quick method for detecting adulterated edible vegetable oils containing WCO.

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