PMID- 20961040
OWN - NLM
STAT- MEDLINE
DCOM- 20110301
LR  - 20220318
IS  - 1520-5118 (Electronic)
IS  - 0021-8561 (Linking)
VI  - 58
IP  - 22
DP  - 2010 Nov 24
TI  - Analysis of agricultural residues on tea using d-SPE sample preparation with 
      GC-NCI-MS and UHPLC-MS/MS.
PG  - 11553-60
LID - 10.1021/jf102476m [doi]
AB  - This study presents new sample preparation and analytical procedures for the 
      quantification of pesticides on processed tea leaves. The new method includes tea 
      extraction and dispersive solid phase extraction (d-SPE) to prepare gas 
      chromatography (GC) and ultrahigh-performance liquid chromatography (UHPLC)-ready 
      samples, providing a fast and cost-effective solution for time-sensitive 
      industrial analysis to fulfill regulatory requirements. Both GC-negative chemical 
      ionization mass spectrometry (GC-NCI-MS) and UHPLC-tandem mass spectrometry 
      (UHPLC-MS/MS) were employed to produce highly sensitive and reproducible data. 
      Excellent limits of detection (typically below 1 mug/kg for GC and 10 mug/kg for 
      UHPLC), wide linearity ranges, and good recoveries (mostly >70%) were achieved on 
      the selected pesticides. Twenty-seven tea samples purchased from local grocery 
      stores were analyzed using the newly developed methods. Among the pesticides 
      analyzed, endosulfan sulfate and kelthane were the most frequently detected by 
      GC-NCI-MS and imidacloprid and acetamiprid by UHPLC-MS/MS in these teas. The 
      samples were found to be relatively clean, with <1 mg/kg of total pesticide 
      residues. The organic-labeled teas were significantly cleaner than nonorganic 
      ones. The cost per gram of tea did not correlate with pesticide residue levels 
      detected.
FAU - Zhang, Xian
AU  - Zhang X
AD  - Ingredient Quality Department, The Coca-Cola Company, 1 Coca-Cola Plaza, Atlanta, 
      Georgia 30313, United States.
FAU - Mobley, Nicole
AU  - Mobley N
FAU - Zhang, Jiugen
AU  - Zhang J
FAU - Zheng, Xiaomin
AU  - Zheng X
FAU - Lu, Ling
AU  - Lu L
FAU - Ragin, Oscar
AU  - Ragin O
FAU - Smith, Christopher J
AU  - Smith CJ
LA  - eng
PT  - Evaluation Study
PT  - Journal Article
DEP - 20101020
PL  - United States
TA  - J Agric Food Chem
JT  - Journal of agricultural and food chemistry
JID - 0374755
RN  - 0 (Pesticide Residues)
RN  - 0 (Tea)
SB  - IM
MH  - Camellia sinensis/*chemistry
MH  - Chromatography, High Pressure Liquid/*methods
MH  - Gas Chromatography-Mass Spectrometry/*methods
MH  - Pesticide Residues/*analysis/isolation & purification
MH  - Solid Phase Extraction/*methods
MH  - Tandem Mass Spectrometry/*methods
MH  - Tea/*chemistry
EDAT- 2010/10/22 06:00
MHDA- 2011/03/02 06:00
CRDT- 2010/10/22 06:00
PHST- 2010/10/22 06:00 [entrez]
PHST- 2010/10/22 06:00 [pubmed]
PHST- 2011/03/02 06:00 [medline]
AID - 10.1021/jf102476m [doi]
PST - ppublish
SO  - J Agric Food Chem. 2010 Nov 24;58(22):11553-60. doi: 10.1021/jf102476m. Epub 2010 
      Oct 20.