PMID- 21780288
OWN - NLM
STAT- MEDLINE
DCOM- 20120112
LR  - 20110914
IS  - 1615-9314 (Electronic)
IS  - 1615-9306 (Linking)
VI  - 34
IP  - 18
DP  - 2011 Sep
TI  - Magnetic solid-phase extraction based on magnetic carbon nanotube for the 
      determination of estrogens in milk.
PG  - 2498-504
LID - 10.1002/jssc.201100323 [doi]
AB  - In this work, a novel method for the fabrication of magnetic carbon nanotubes 
      based on 'aggregation wrap' was proposed. When carbon nanotubes and magnetic 
      nanoparticles were vortically mixed in a solvent, the magnetic nanoparticles were 
      wrapped into the carbon nanotube bundles that formed during the aggregation 
      process, leading to the formation of magnetic carbon nanotubes. Thus, the 
      resultant material can be separated from the solvent rapidly and conveniently by 
      a magnet. Our investigation demonstrated that the 'aggregation wrap' mechanism 
      for the preparation of magnetic composite is also applicable to other 
      self-aggregated micro/nanomaterials, including graphene, graphite, C(60), etc. To 
      testify the feasibility of the magnetic composites in sample preparation, the 
      resultant magnetic carbon nanotubes were applied as sorbents for magnetic 
      solid-phase extraction (MSPE) of estrogens in milk samples. Under optimized 
      conditions, a rapid, convenient and efficient method for the determination of 
      estrogens in milk samples was established by the combination of MSPE with 
      high-performance liquid chromatography with fluorescence detector. The linearity 
      range of the proposed method was 5-2000 mug/L with correlation coefficients (R) of 
      0.9983-0.9994. The limit of detection (LOD) for three estrogens ranged from 1.21 
      to 2.35 mug/L. The intra- and inter-day relative standard deviations (RSDs) were 
      <9.3%. The reproducibility of the MSPE with different batches of magnetic carbon 
      nanotubes was acceptable with RSD values <3.6%.
CI  - Copyright (c) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
FAU - Ding, Jun
AU  - Ding J
AD  - Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of 
      Education), Department of Chemistry, Wuhan University, Wuhan, PR China.
FAU - Gao, Qiang
AU  - Gao Q
FAU - Li, Xiao-Shui
AU  - Li XS
FAU - Huang, Wei
AU  - Huang W
FAU - Shi, Zhi-Guo
AU  - Shi ZG
FAU - Feng, Yu-Qi
AU  - Feng YQ
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20110721
PL  - Germany
TA  - J Sep Sci
JT  - Journal of separation science
JID - 101088554
RN  - 0 (Estrogens)
RN  - 0 (Nanotubes, Carbon)
SB  - IM
MH  - Adsorption
MH  - Animals
MH  - Chromatography, High Pressure Liquid
MH  - Estrogens/*analysis
MH  - Hydrogen-Ion Concentration
MH  - *Magnetics
MH  - Milk/*chemistry
MH  - Molecular Conformation
MH  - Nanotubes, Carbon/*chemistry
MH  - Particle Size
MH  - *Solid Phase Extraction
MH  - Spectrometry, Fluorescence
MH  - Surface Properties
EDAT- 2011/07/23 06:00
MHDA- 2012/01/13 06:00
CRDT- 2011/07/23 06:00
PHST- 2011/04/11 00:00 [received]
PHST- 2011/06/11 00:00 [revised]
PHST- 2011/06/12 00:00 [accepted]
PHST- 2011/07/23 06:00 [entrez]
PHST- 2011/07/23 06:00 [pubmed]
PHST- 2012/01/13 06:00 [medline]
AID - 10.1002/jssc.201100323 [doi]
PST - ppublish
SO  - J Sep Sci. 2011 Sep;34(18):2498-504. doi: 10.1002/jssc.201100323. Epub 2011 Jul 
      21.