PMID- 18481329
OWN - NLM
STAT- MEDLINE
DCOM- 20080902
LR  - 20121115
IS  - 1615-9314 (Electronic)
IS  - 1615-9306 (Linking)
VI  - 31
IP  - 10
DP  - 2008 Jun
TI  - Effectiveness of pressurized liquid extraction and solvent extraction for the 
      simultaneous quantification of 14 pesticide residues in green tea using GC.
PG  - 1750-60
LID - 10.1002/jssc.200800010 [doi]
AB  - A simultaneous multiresidue method to determine 14 different pesticides, namely: 
      flufenoxuron, fenitrothion, chlorfluazuron, chlorpyrifos, hexythiazox, 
      methidathion, chlorfenapyr, tebuconazole, EPN, bifenthrin, cyhalothrin, 
      spirodiclofen, difenoconazole, and azoxystrobin in green tea using pressurized 
      liquid extraction (PLE) is described and compared with that of liquid-liquid 
      extraction (LLE). For PLE, the extraction conditions were not optimized. Rather 
      they were selected based upon previous successful investigations published by our 
      laboratory. Analysis was performed by GC with electron capture detector (GC-ECD), 
      and the pesticide identity of the positive samples was confirmed by GC-MS in a 
      selected ion-monitoring (SIM) mode. Calibration curves showed an excellent 
      linearity for concentrations ranging from 0.006 to 36.049 ppm, with r(2) >0.995. 
      Green tea spiked at each of the two fortification levels, yielded average 
      recoveries in the range of 87-112% and 71-109% for PLE and LLE, respectively. 
      Precision values, expressed as RSDs, were below 6% at various spiking levels. 
      With respect to the existing procedures, both methods gave LOQs that were lower 
      than the maximum residue limits (MRLs) established by the Korea Food and Drug 
      Administration (KFDA). Both methods have been successfully applied to the 
      analysis of real samples, and bifenthrin was the only pesticide residue 
      quantified in incurred green tea samples, with concentrations ranging from 0.093 
      ppm (LLE) to 0.1 ppm (PLE). These concentration levels were relatively low 
      compared to KFDA-MRL (0.3 ppm). According to the validation data and performance 
      characteristics, both methods are appropriate for multiresidue analysis of 
      pesticide residues in green tea. PLE methodology showed superiority in recoveries 
      of some pesticides, acceptable accuracy and precision while minimizing 
      environmental concerns, time, and labor, and can be applied in routine analytical 
      laboratories.
FAU - Cho, Soon-Kil
AU  - Cho SK
AD  - Natural Products Chemistry Laboratory, Institute of Agricultural Science and 
      Technology, College of Agriculture and Life Science, Chonnam National University, 
      Buk-Ku, Gwangju, Republic of Korea. Fax: +82-62-530-0219.
FAU - Abd El-Aty, A M
AU  - Abd El-Aty AM
FAU - Choi, Jeong-Heui
AU  - Choi JH
FAU - Jeong, Yang-Mo
AU  - Jeong YM
FAU - Shin, Ho-Chul
AU  - Shin HC
FAU - Chang, Byung-Joon
AU  - Chang BJ
FAU - Lee, Chitto
AU  - Lee C
FAU - Shim, Jae-Han
AU  - Shim JH
LA  - eng
PT  - Journal Article
PL  - Germany
TA  - J Sep Sci
JT  - Journal of separation science
JID - 101088554
RN  - 0 (Ions)
RN  - 0 (Pesticide Residues)
RN  - 0 (Pyrethrins)
RN  - 0 (Solvents)
RN  - 0 (Tea)
RN  - 6B66JED0KN (bifenthrin)
SB  - IM
MH  - Calibration
MH  - Chemistry Techniques, Analytical/methods
MH  - Chromatography
MH  - Chromatography, Gas/*methods
MH  - Electrons
MH  - Gas Chromatography-Mass Spectrometry/methods
MH  - Ions
MH  - Models, Chemical
MH  - Pesticide Residues/*analysis
MH  - Pressure
MH  - Pyrethrins/analysis
MH  - Reproducibility of Results
MH  - Solvents/*chemistry
MH  - Tea/*metabolism
MH  - Temperature
EDAT- 2008/05/16 09:00
MHDA- 2008/09/03 09:00
CRDT- 2008/05/16 09:00
PHST- 2008/05/16 09:00 [pubmed]
PHST- 2008/09/03 09:00 [medline]
PHST- 2008/05/16 09:00 [entrez]
AID - 10.1002/jssc.200800010 [doi]
PST - ppublish
SO  - J Sep Sci. 2008 Jun;31(10):1750-60. doi: 10.1002/jssc.200800010.