title: Evaluation of pressurized liquid extraction for the analysis of four pesticides in unpolished rice.
abstract: The aim of to evaluate efficiency of this study was extraction pressurized liquid extraction (PLE) for the analysis of four pesticides, fthalide, etofenprox, fenitrothion, and isoprothiolane, in unpolished rice by comparing with homogenization as a reference technique. The concentrations of four selected pesticides obtained by PLE with acetonitrile at 130 degrees C for 10 min x 2 cycles were comparable to those by homogenization with water-soaking. The repeatability of the analysis, represented as relative standard deviations (RSDs), were 1.4-3.6% (n = 3) for PLE at 130 degrees C and 1.2-3.8% (n = 3) for homogenization with water-soaking. Recovery yields of surrogates were 75-88% and 87-109% for PLE at 130 degrees C and homogenization with water-soaking, respectively, and these were satisfactory according to the method of positive list. This study suggested that PLE can be applied for the analysis of selected four pesticides in unpolished rice as well as homogenization with water-soaking.
authors.affiliation: National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki, Japan. t-ootake@aist.go.jp
authors.forename: Takamitsu
authors.initials: T
authors.lastname: Otake
authors.forename: Yoshie
authors.initials: Y
authors.lastname: Aoyagi
authors.forename: Mayumi
authors.initials: M
authors.lastname: Matsuo
authors.forename: Nobuyasu
authors.initials: N
authors.lastname: Itoh
authors.forename: Takashi
authors.initials: T
authors.lastname: Yarita
mesh_terms: D002849:Chromatography, Gas; D019411:Clinical Laboratory Techniques; D013058:Mass Spectrometry; D012275:Oryza / Q000737:chemistry*; D010575:Pesticides / Q000032:analysis*; D012015:Reference Standards; D015203:Reproducibility of Results; D012989:Soil Pollutants / Q000032:analysis*; D012995:Solubility; D013696:Temperature; D014867:Water / Q000737:chemistry*
chemical_list: D010575:Pesticides; D012989:Soil Pollutants; D014867:Water