PMID- 23687955
OWN - NLM
STAT- MEDLINE
DCOM- 20140715
LR  - 20151119
IS  - 1520-5118 (Electronic)
IS  - 0021-8561 (Linking)
VI  - 61
IP  - 22
DP  - 2013 Jun 5
TI  - Dispersive microextraction based on "magnetic water" coupled to gas 
      chromatography/mass spectrometry for the fast determination of organophosphorus 
      pesticides in cold-pressed vegetable oils.
PG  - 5397-403
LID - 10.1021/jf400870m [doi]
AB  - This article presents a novel application of dispersive microextraction based on 
      "magnetic water" (m-water) for the purification of organophosphorus pesticides 
      (methamidophos, omethoate, monocrotophos) from cold-pressed vegetable oils. In 
      the present study, a trace amount of water (extractant) was adsorbed on bare 
      Fe(3)O(4) by hydrophilic interaction to form m-water. Rapid extraction can be 
      achieved while the m-water is dispersed in the sample solution with the aid of a 
      vigorous vortex. After extraction, the analyte-adsorbed m-water can be readily 
      isolated from the sample solution by a magnet, which could greatly simplify the 
      operation and reduce the whole pretreatment time. Several parameters affecting 
      the extraction efficiency were investigated, and under the optimized conditions, 
      a simple and effective method for pesticide analysis was established by coupling 
      with gas chromatography/mass spectrometry (GC/MS). The linearity range of the 
      proposed method was 2-100 ng/g with satisfactory correlation coefficients (R) of 
      0.9997-0.9998, and the limits of quantification (LOQ) for the target compounds 
      were in the range of 0.70-1.27 ng/g. In addition, the reproducibility was 
      obtained by evaluating the intra- and interday precisions with relative standard 
      deviations (RSDs) less than 7.2% and 6.5%, respectively. Finally, the established 
      "magnetic water" microextraction method was successfully applied for the 
      determination of pesticide residues in several kinds of cold-pressed vegetable 
      oils.
FAU - Zhao, Qin
AU  - Zhao Q
AD  - Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of 
      Education), Department of Chemistry, Wuhan University , Wuhan 430072, People's 
      Republic of China.
FAU - Lu, Qian
AU  - Lu Q
FAU - Yu, Qiong-Wei
AU  - Yu QW
FAU - Feng, Yu-Qi
AU  - Feng YQ
LA  - eng
PT  - Comparative Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20130528
PL  - United States
TA  - J Agric Food Chem
JT  - Journal of agricultural and food chemistry
JID - 0374755
RN  - 0 (Organophosphorus Compounds)
RN  - 0 (Organothiophosphorus Compounds)
RN  - 0 (Pesticide Residues)
RN  - 0 (Pesticides)
RN  - 0 (Plant Oils)
RN  - 059QF0KO0R (Water)
RN  - 28U28EWE79 (dimethoxon)
RN  - 6923-22-4 (Monocrotophos)
RN  - 8Z083FM94W (methamidophos)
RN  - W6U08B045O (Dimethoate)
SB  - IM
MH  - Analytic Sample Preparation Methods
MH  - China
MH  - Dimethoate/analogs & derivatives/analysis/chemistry
MH  - *Food Contamination
MH  - Food Inspection/*methods
MH  - Gas Chromatography-Mass Spectrometry
MH  - Liquid Phase Microextraction
MH  - Magnetic Phenomena
MH  - Monocrotophos/analysis/chemistry
MH  - Organophosphorus Compounds/*analysis/chemistry
MH  - Organothiophosphorus Compounds/analysis/chemistry
MH  - Pesticide Residues/*analysis/chemistry
MH  - Pesticides/*analysis/chemistry
MH  - Plant Oils/*chemistry
MH  - Water/*chemistry
EDAT- 2013/05/22 06:00
MHDA- 2014/07/16 06:00
CRDT- 2013/05/22 06:00
PHST- 2013/05/22 06:00 [entrez]
PHST- 2013/05/22 06:00 [pubmed]
PHST- 2014/07/16 06:00 [medline]
AID - 10.1021/jf400870m [doi]
PST - ppublish
SO  - J Agric Food Chem. 2013 Jun 5;61(22):5397-403. doi: 10.1021/jf400870m. Epub 2013 
      May 28.