PMID- 26129984
OWN - NLM
STAT- MEDLINE
DCOM- 20151013
LR  - 20181202
IS  - 1873-3778 (Electronic)
IS  - 0021-9673 (Linking)
VI  - 1406
DP  - 2015 Aug 7
TI  - Superparamagnetic core-shells anchored onto graphene oxide grafted with 
      phenylethyl amine as a nano-adsorbent for extraction and enrichment of 
      organophosphorus pesticides from fruit, vegetable and water samples.
PG  - 48-58
LID - S0021-9673(15)00872-9 [pii]
LID - 10.1016/j.chroma.2015.06.025 [doi]
AB  - A novel adsorbent composed of silica coated magnetic microparticles (Fe3O4@SiO2) 
      and graphene oxide (GO) functionalized with phenylethyl amine (PEA) was 
      synthesized and characterized using Fourier transform-infrared (FT-IR) 
      spectroscopy, scanning electron microscopy (SEM), vibrating sample magnetometry 
      (VSM), and CHN elemental analysis techniques. The adsorbent (Fe3O4@SiO2@GO-PEA) 
      was then used in a magnetic solid phase extraction (MSPE) of six 
      organophosphorous pesticides (OPPs) including methyl parathion, fenitrothion, 
      methidathion, ethion, methyl azinphos and coumaphos prior to gas 
      chromatography-nitrogen phosphorus detection (GC-NPD). The fabricated adsorbent 
      combines the advantages of superior adsorption capability of modified GO and 
      magnetic separability of magnetite microparticles to provide high adsorption 
      capacity, and easy isolation from sample solutions. The main experimental 
      parameters affecting the extraction recovery of OPPs including extraction time, 
      pH, adsorbent dosage, salt concentration, and desorption conditions were 
      investigated and optimized. Under the optimal conditions, linear responses were 
      obtained in the concentration range of 0.06-200mugL(-1) with the determination 
      coefficients (R(2)) between 0.9945 and 0.9996. The limits of detection were from 
      0.02 to 0.1mugL(-1) and the intraday and inter-day relative standard deviations 
      (RSDs) were less than 4.8 and 6.4%, respectively. The method was successfully 
      applied for determination of the OPPs in apple, grape, pear, bell pepper, celery 
      and water samples. The obtained recoveries were in the range of 90.4-108.0% 
      (RSDs=1.9-6.6%, n=3) for fruits and vegetables, and 94.6-104.2% (RSDs=2.0-4.8%, 
      n=3) for water samples. The excellent extraction performance of the adsorbent can 
      be attributed to its structure characteristics where the phenyl rings of PEA 
      grafted on the GO nanosheets are accessible to interact effectively with OPPs via 
      delocalized pi-electron system.
CI  - Copyright (c) 2015 Elsevier B.V. All rights reserved.
FAU - Mahpishanian, Shokouh
AU  - Mahpishanian S
AD  - Department of Chemistry, Faculty of Science, University of Tehran, Tehran, Iran.
FAU - Sereshti, Hassan
AU  - Sereshti H
AD  - Department of Chemistry, Faculty of Science, University of Tehran, Tehran, Iran. 
      Electronic address: sereshti@ut.ac.ir.
FAU - Baghdadi, Majid
AU  - Baghdadi M
AD  - Graduate Faculty of Environment, University of Tehran, Tehran, Iran.
LA  - eng
PT  - Journal Article
DEP - 20150619
PL  - Netherlands
TA  - J Chromatogr A
JT  - Journal of chromatography. A
JID - 9318488
RN  - 0 (Environmental Pollutants)
RN  - 0 (Pesticides)
RN  - 059QF0KO0R (Water)
RN  - 7782-42-5 (Graphite)
SB  - IM
MH  - Adsorption
MH  - Chromatography, Gas
MH  - Environmental Monitoring/*methods
MH  - Environmental Pollutants/*analysis
MH  - Food Analysis/*methods
MH  - Fruit/*chemistry
MH  - Graphite/chemistry
MH  - Limit of Detection
MH  - Magnetics
MH  - Pesticides/*analysis
MH  - Solid Phase Extraction
MH  - Spectroscopy, Fourier Transform Infrared
MH  - Vegetables/*chemistry
MH  - Water/*chemistry
OTO - NOTNLM
OT  - Fe(3)O(4)@silica@geraphene oxide-phenylethyl amine
OT  - Gas chromatography
OT  - Magnetic microparticle
OT  - Magnetic solid phase extraction
OT  - Organophosphorous pesticides
EDAT- 2015/07/02 06:00
MHDA- 2015/10/16 06:00
CRDT- 2015/07/02 06:00
PHST- 2015/03/24 00:00 [received]
PHST- 2015/06/10 00:00 [revised]
PHST- 2015/06/10 00:00 [accepted]
PHST- 2015/07/02 06:00 [entrez]
PHST- 2015/07/02 06:00 [pubmed]
PHST- 2015/10/16 06:00 [medline]
AID - S0021-9673(15)00872-9 [pii]
AID - 10.1016/j.chroma.2015.06.025 [doi]
PST - ppublish
SO  - J Chromatogr A. 2015 Aug 7;1406:48-58. doi: 10.1016/j.chroma.2015.06.025. Epub 
      2015 Jun 19.