title: [Analysis of phenmedipham in agricultural products by HPLC].
abstract: An analytical method was developed for the determination of phenmedipham (PM) in agricultural products using reversed-phase high-performance liquid chromatography with UV detection. A sample was extracted with acetonitrile, and the acetonitrile layer was separated by salting-out. The acetonitrile phase was isolated and evaporated. The extract was dissolved in diethyl ether-hexane (1 : 1), and then cleaned up on a Florisil column. The column was washed with diethyl ether-hexane (1 : 1), and PM was eluted with acetone-hexane (3 : 7), and the eluate was evaporated. The residue was dissolved in acetone-hexane (2 : 8), and the sample solution was cleaned up on SAX/PSA cartridge. The SAX/PSA cartridge was washed with acetone-hexane (2 : 8), and PM was eluted with acetone-hexane (3 : 7). If required, the eluate of the Florisil column was cleaned up with SAX/PSA and ENVI-Carb/ NH2 cartridges. The SAX/PSA cartridge was washed with acetone-hexane (2 : 8), and connected to be ENVI-Carb/NH2 cartridge. The cartridges were washed with acetone-hexane (3 : 7), and then the SAX/PSA cartridge was removed. PM was eluted with acetonitrile-toluene (3 : 1) from the ENVI-Carb/NH2 cartridge. PM in the eluate was separated isocratically on an ODS column (4.6 mm i.d. x 150 mm, 5 microm) using acetonitrile-water (6 : 4) as a mobile phase (flow-rate 1.0 mL/min, temp. 40 degrees C), with monitoring at 235 nm. The calibration curve was linear from 0.005 microg/mL to 10 microg/mL of PM. The recoveries of PM from eight kinds of agricultural products spiked at levels of 0.1 and 0.02 microg/g were 80.8-98.7%. The determination limit was 0.01 microg/g.
authors.affiliation: Tokyo Kenbikyoin Foundation Center of Food and Environmental Sciences, 44-1, Nihonbashi Hakozaki-cho, Chuo-ku, Tokyo 103-0015, Japan.
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Imazawa
authors.forename: Tomonari
authors.initials: T
authors.lastname: Iida
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Matsuno
authors.forename: Fumiaki
authors.initials: F
authors.lastname: Kato
authors.forename: Takeshi
authors.initials: T
authors.lastname: Ito
authors.forename: Kumiko
authors.initials: K
authors.lastname: Sasaki
mesh_terms: D027461:Beta vulgaris / Q000737:chemistry; D002219:Carbamates / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D018556:Crops, Agricultural / Q000737:chemistry*; D005506:Food Contamination / Q000032:analysis*; D006540:Herbicides / Q000032:analysis*; D010573:Pesticide Residues / Q000032:analysis*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D002219:Carbamates; D006540:Herbicides; D010573:Pesticide Residues; C100128:phenmedipham