期刊
JOURNAL OF FOOD PROTECTION
卷 81, 期 7, 页码 1087-1092出版社
INT ASSOC FOOD PROTECTION
DOI: 10.4315/0362-028X.JFP-17-505
关键词
Headspace; Pesticide; Solid-phase microextraction; Surface-enhanced Raman spectroscopy
资金
- National Institute of Food and Agriculture of the U.S. Department of Agriculture [USDA-NIFA 2016-67017-24458]
- China Scholarship Council [201606150089, 201308360013]
We developed an innovative approach that couples headspace solid-phase microextraction (SPME) with surface-enhanced Raman spectroscopy (SERS) to detect a volatile pesticide (i.e., fonofos) in a liquid complex matrix (i.e., apple juice). A gold nanoparticles-coated fiber was fabricated by reducing gold(III) on a chemically etched stainless steel wire to extract pesticide, using SPME. The fabricated fibers were then tested by a headspace-SPME method and a dip-SPME method, followed by SERS detection of fonofos in water and apple juice samples. Using the headspace-SPME method, we can detect as low as 5 ppb of fonofos in water and apple juice, compared with the dip-SPME method, which cannot detect lower than 10 ppb in water and 50 ppb in apple juice. This study demonstrated the potential capability of the headspace-SPME-SERS method for rapid (within 30 min) and sensitive detection of volatile and vaporizable compounds in complex matrices. The developed method could be a potential alternative approach to the gas chromatography method. Future work is needed to optimize the fiber by minimizing signal variation, and it should be tested in a variety of targeted compounds and matrices.
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