Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 57, Issue 15, Pages 6558-6563Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf901286e
Keywords
Parathion; vegetables; molecular imprinting; polyethyleneimine; silica gel; electrochemical sensor
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A novel sensor for the determination of parathion based on coupled grafting of the functional macromolecule polyethylene! mine on surfaces of silica gel particles via a surface imprinting method using molecular imprinting technology was fabricated. The electrochemical behavior of parathion at the imprinted sensor was characterized by cyclic voltammetry and linear sweeping voltammetry. The imprinted films showed high selectivity toward parathion in comparison to similar organophosphates. A linear response over parathion concentration in the range of 0.015-15 mg kg(-1) was exhibited with a detection limit of 0.003 mg kg(-1) (S/N = 3). The imprinted film sensor has been applied to the determination of parathion in spiked vegetable samples and shows promise for fast and selective determination of trace levels of parathion in real samples.
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