rapid ce-uv evaluation of polymer-coated magnetic nanoparticles for selective binding of endocrine...
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Rapid CE-UV Evaluation of Polymer-coated Magnetic Nanoparticles for Selective Binding of
Endocrine Disrupting Compounds and Pharmaceuticals in Water by Aromatic
Interactions
Prepared by
Musharraf Miah
Department of Chemistry
Carleton University
September 12, 2012
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Some Abbreviations
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CE-UV Capillary electrophoresis with ultra-violet detector
EDCs Endocrine disrupting compounds
PPCPs Pharmaceutical and personal care products
BPA Bisphenol A
MF Metformin
PF Phenformin
NAA Naphthalene acetic acid
TC Triclosan
QS Quinine sulfate
MNPs Magnetic nanoparticles
MNPs@PPy Polypyrrole-coated magnetic nanoparticles
MNPs@PDA Polydopamine-coated magnetic nanoparticles
FTIR Fourier transform infrared spectroscopy
SEM Scanning electron microscopy
TGA Thermogravimetric analysis
XRD X-ray diffraction
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Outline Introduction Research objectives Experimental Results and Discussion Conclusion Future work Acknowledgement
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Introduction
EDCs alter the normal functions of the endocrine system in humans
and animals
They mimic the body's own hormones and lead to negative health
effects
BPA is widely used in plastics (toxic) NAA is a plant hormone used in plant rooting horticultural products,
pesticides on fruits and vegetables (also toxic)
TC is used in soaps, toothpastes, detergents, hand sanitizers,
mouth and dish washes
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Introduction(continue)
PPCPs- wide class of chemical contaminants originate from human
usage and veterinary applications
Three PPCPs analyzed MF, PF, and QS
Long-term exposure to low levels of PPCP residues could have
adverse effects on aquatic ecosystem and human health
(Environment Canada)
EDCs and PPCPs are found in aquatic environment from sewage
treatment plant effluent, agricultural runoff, concentrated animal feed,
landfill leachates, and urban runoff
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Introduction(continue)
MNPs are currently attracting a wide range of applications in water
treatment (not target selective in complex water matrices) Target selective MNPs MNPs@PDA, MNPs@PPy
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Chemical structures of target compounds
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BPA MF
NAA PF
TC QS
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Polypyrrole and polydopamine
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Research objectives
Synthesize MNPs, MNPs@PDA and MNPs@PPy nanoparicles
Characterize the particles by FTIR, SEM, TGA and XRD
Evaluate these magnetic nanoparticles for selective binding with
BPA, NAA, MF, PF, TC, and QS in water by CE-UV
Study the adsorption kinetics and adsorption isotherms of BPA, TC
and PF
Utilize these particles as magnetic sorbents for the preconcentration
of target compounds in water analysis
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Experimental
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Experimental setup for coating MNPs with PPy or PDA
Illustration of Fe3O4 and Fe3O4@PPy syntheses
Ref: X. Wang, L. Wang, X. He, Y. Zhang and L. Chen, Talanta. 2009, 78, 327-332. J. Meng, J. Bu, C. Deng and X. Zhang, J. Chromatogr. A., 2011, 1218, 1585-1591 H. Z. Wen, H. L. Chun, C. G. Xiu, R. C. Fa, H. Y. Huang, and R. W. Xiao, J. Mater. Chem., 2010, 20, 880-883
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FTIR spectra of MNPs, PPy and MNPs@PPy particles
11Ref: T. Yao, T. Cui, J. Wu, Q. Chen, S. Lu, and K. Sun, Polymer chemistry, 2011, 2, 2893 Y. Wang, W. Chen, D. Zhou and G. Xue, Macromol. Chem. Phys., 2009, 210, 936-941.
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FTIR spectra of MNPs and MNPs@PDA particles
12Ref: L. P. Zhu, J. H. Jiang, B. K. Zhu, and Y.Y. Xu, Colloid. Surface. B., 2011, 86, 111-118.
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SEM images of MNPs, MNPs@PPy
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Average MNPs = 45-50 nm, MNPs@PPy = 70-75 nm, MNPs@PDA = 75-80 nm PPy coating = 12-15 nm, PDA coating = 15-18 nm
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XRD spectra of MNPs and MNPs@PPy particles
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Characteristic peaks for MNPs: 31.7°, 37.1°, 44.8°, 55.3°, 58.9° and 64.4° New peaks for MNPs@PPy: 14.6 ° and 22 °
Ref: A. Hrdina, E.P.C. Lai, C.S. Li, B. Sadi and G. Kramer, J. Magn. Magn. Mater., 2010, 322, 2622-2627. T. Yao, T. Cui, J. Wu, Q. Chen, S. Lu, and K. Sun, Polymer chemistry, 2011, 2, 2893.
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Capillary electrophoresis
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Capillary
C a tio ns Ne utra ls Anio ns
Background electrolyte (BGE)
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Results and Discussions
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Electrophoretic mobility values of analytes, MNPs, MNPs@PDA and MNPs@PPy
Mep = Mapp – Meo = [(Ld/ t) / (V/ Lt)] - [(Ld/ t neutral) / V/Lt)]
Migration Time
(t in min)
Molecular Weight
(g.mol-1)
Electrophoretic Mobility
(m2V-1s-1)
Metformin (MF) 3.4 ± 0.1 165.62 1.18x10-8
Phenformin (PF) 3.7 ± 0.1 205.26 6.94x10-9
Quinine sulfate (QS) 4.0 ± 0.1 782.96 2.78x10-9
Mesityl Oxide (MO) 4.2 ± 0.1 98.14 00
Bisphenol A (BPA) 4.5 ± 0.1 228.29 -2.91x10-9
Triclosan (TC) 5.5 ± 0.1 289.54 -1.12x10-8
Naphthalene acetic acid (NAA)
6.9 ± 0.1 186.20 -1.87x10-8
MNPs 7.8 ± 0.1 231.54 -2.21x10-8
MNPs@PDA 8.2 ± 0.1 ----- -2.34x10-8
MNPs@PPy 8.6 ± 0.1 ----- -2.46x10-8
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CE-UV electropherogram for a mixture of BPA, MF, NAA, PF, TC, and QS (200 µg.mL-1) in 20 mM Na2HPO4 BGE
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In-capillary binding test results
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Analytes (200 µg.mL-
1)
% Binding with MNPs (10 mg. mL-1)
% Binding with MNPs@PDA (10 mg.
mL-1)
% Binding with MNPs@PPy (10 mg.
mL-1)
Bisphenol A (BPA)
5 ± 3 65 ± 5 99 ± 1
Metformin (MF)
2 ± 2 14 ± 6 34 ± 4
Naphthalene acetic acid
(NAA)
7 ± 3 21 ± 4 39 ± 6
Phenformin (PF)
5 ± 3 99 ± 1 99 ± 1
Triclosan
(TC)
6 ± 3 92 ± 3 99 ± 1
Quinine sulfate (QS)
8 ± 2 94 ± 2 98 ± 2
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4 m
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2 m
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det
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2 m
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Electropherograms of Standard BPA, PF, TC and NAA
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In-capillary binding test
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Electropherograms: Binding of BPA, PF, TC and NAA with MNPs@PPy
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In-vitro binding test results
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Analytes (200 µg. mL-1)
% Binding with MNPs (9 mg. mL-1)
% Binding with MNPs@PDA (9
mg.mL-1)
% Binding with MNPs@PPy (9
mg.mL-1)
Bisphenol A (BPA) 10 ± 3 71 ± 5 94 ± 2
Metformin (MF) 5 ± 2 43 ± 3 30 ± 4
Naphthalene acetic acid (NAA)
8 ± 2 22 ± 2 68 ± 4
Phenformin (PF) 6 ± 3 94 ± 2 99 ± 1
Triclosan (TC) 7 ± 3 95 ± 1 99 ± 1
Quinine sulfate (QS) 10 ± 2 95 ± 1 99 ± 1
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(A) 6 analytes mixture (B) Supernatant after extraction with MNPs
(C) Supernatant after extraction with MNPs@PDA
(D) Supernatant after extraction with MNPs@PPy
Binding selectivity (in-vitro binding test)
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Elution test of MNPs@PPy particles
A mixture of EtAc and MeOH (75:25, v/v) was selected as the eluting
solvent
The % recoveries of the bound analytes were found to be 85±13% MF,
87±13% PF, 54±11% BPA, 52 ± 10% QS, 39 ±11% TC, and 37 ± 10% NAA
23Ref: J. Meng, J. Bu, C. Deng and X. Zhang, J. Chromatogr. A., 2011, 1218, 1585-1591.
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Regeneration of MNPs@PPy particles
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% Binding = 94±3% % Recovery = 53±4%
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Conclusion
High % binding (99 ± 1%) of MNPs@PPy with BPA, PF, TC, and QS were
found due to π-π and hydrogen bonding interactions between PPy and
analytes
Compared with unmodified MNPs, and MNPs@PDA, MNPs@PPy showed
higher binding efficiency towards aromatic compounds as confirmed by in-
capillary and in-vitro binding tests.
Using EtAc and MeOH (75:25,v/v) as eluting solvent , the % recoveries of
target compounds are found to be between 87% and 37%
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Conclusion (continue)
The higher adsorption capacity (Xm) of MNPs@PPy particles was obtained for
BPA, PF, and TC
Demonstrating strong affinity and better performance of MNPs@PPy particles
as adsorbents for efficient removal of these target compounds
The new coating of PPy on the used particles proved to be time saving and
cost effective in recycling the used particles
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Future work
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Investigate the binding interaction of these drugs with MNPs@PPy particles by CE-UV
The loaded particles can be used for specific drug delivery to target cancer cells
Chemical structures of common anticancer drugs
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Acknowledgements
I would like to express my deepest appreciation to my supervisor, Dr.
Edward Lai for his supervision, advice and guidance
I am thankful to Dr. Zafar Iqbal for his kind assistance during this study
I am thankful to all colleagues in my group for sharing their experience and
knowledge
I am thankful to Anita Chun and Dr. Wendy Hao for their technical
assistance
Financial support from NSERC Canada is gratefully acknowledged.
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Thank you for listening