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Abstract: The pre-treatment methodology of purification and preconcentration of four sulfonylurea herbicides, including bensulfuron-methyl (BSM), metsulfuron-methyl (MSM), nicosulfuron (NS) and tribenuron-methyl (TBM) in spiked rice samples were developed using BSM molecular imprinting polymers solid phase extraction (MISPE) cartridges prepared by using the molecular imprinted polymer (MIP) as the sorbent. The MIP was prepared using the BSM as template molecule, trimethylolpropane trimethacrylate (TRIM): divinyl benzene (DVB) (1 : 1) as the cross-linker, dichloromethane as porogen. The MISPE extraction procedure has been optimized. The quantitative analysis of four herbicides was performed by liquid chromatography - mass spectrometry under positive ion mode. The calibration curves were linear for four sulfonylurea herbicides in the concentration range of 0.01-0.70 mg L-1 and the recoveries from spiked rice samples were between 68% and 100%. The result indicated that except for the interferents, the sulfonylurea herbicides of BSM, MSM, NS and TBM were strongly retained by the imprinting sites in BSM molecular imprinting polymers SPE cartridges. The MIP showed high selective recognition and affinity to four sulfonylurea herbicides. (Analytical Abstracts 2010)
Template and target information: bensulfuron-methyl, BSM, metsulfuron-methyl, MSM, nicosulfuron, NS, tribenuron-methyl, TBM
Author keywords: sulfonylurea herbicide, high performance liquid chromatography-mass spectrometry, molecular imprinting, solid phase extraction, rice sample