Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 63, Issue 30, Pages 6689-6697Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.5b01828
Keywords
quaternary ammonium compounds; vegetable; ultrasonic-assisted extraction; GC-MS; matrix effect
Funding
- National Natural Science Foundation of China [41071211, 41173101, 41301337, 41273113]
- Guangdong Natural Science Foundation [S2011010001083, 2011020003196]
- project on the Integration of Industry, Education and Research of Guangdong Province [2013B0906001]
- High-Level Talents Program of Guangdong Higher Education Institutions
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A reliable, sensitive, and cost-effective method was developed for determining three quaternary ammonium compounds,(QACs) including dodecyltrimethylammonium chloride, cetyltrimethylammonium chloride, and didodecyldime-thylammonium chloride in various vegetables using ultrasonic-assisted extraction and gas chromatography mass spectrometry. The Variety and acidity of extraction solvents, extraction times, and cleanup efficiency of sorbents were estimated to obtain an optimized procedure for extraction of the QACs in nine vegetable matrices. Excellent linearities.(R-2 > 0.992) were obtained for the analytes in the nine matrices. The limits of detection and quantitation were 0.7-6.0 and 2.3-20.0 mu g/kg (dry weight, dw) in various matrices, respectively. The recoveries in the nine matrices ranged from 70.5% to 108.0% with relative standard deviations below 18.0%. The developed method was applied to determine the QACs in 27 vegetable samples collected from Guangzhou in southern China, showing very high detection frequency with a concentration of 23-180 mu g/kg (dw).
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