title: Evaluation of a fibrous cellulose drying agent in supercritical fluid extraction and pressurized liquid extraction of diverse pesticides.
abstract: A fibrous cellulose powder (CF-1) was investigated as a drying agent for supercritical fluid extraction (SFE) and pressurized liquid extraction (PLE), also known as accelerated solvent extraction. Analysis of fifty-eight diverse pesticides was performed using gas chromatography-ion-trap mass spectrometric detection (GC-ITD). Extraction efficiencies were correlated versus pesticide polarity with samples of different water-CF-1 ratios. The effect of water was much more pronounced in SFE using CO2 than PLE using acetonitrile. Pesticide recoveries and limits of detection of fortified tomato samples mixed with CF-1 were determined. PLE gave recoveries > 80% for nearly all pesticides, and SFE gave similar recoveries except for the most polar and non-polar pesticides. SFE typically gave lower detection limits than PLE due to fewer matrix interferants.
authors.affiliation: US Department of Agriculture, Beltsville Agricultural Research Center, MD 20705, USA.
authors.forename: S J
authors.initials: SJ
authors.lastname: Lehotay
authors.forename: C H
authors.initials: CH
authors.lastname: Lee
mesh_terms: D002482:Cellulose / Q000737:chemistry*; D002849:Chromatography, Gas / Q000379:methods*; D005069:Evaluation Studies as Topic; D018551:Solanum lycopersicum / Q000737:chemistry*; D010575:Pesticides / Q000032:analysis*; D011312:Pressure
chemical_list: D010575:Pesticides; D002482:Cellulose