Ultrasensitive aptasensing of lysozyme by exploiting the synergistic effect of gold nanoparticle-modified reduced graphene oxide and MWCNTs in a chitosan matrix

Ultrasensitive aptasensing of lysozyme by exploiting the synergistic effect of gold... The authors describe a lysozyme aptasensor based on the use of gold nanoparticles (AuNP) assembled on the carbon nanotubes, graphene oxide and chitosan. An electrochemical impedance spectroscopic study was performed to demonstrate the synergistic effect of the MWCNT-AuNP, Chit-AuNP and GO-AuNP composites and the order of the layers affect the performance of aptasensing. Different parameters were optimized in order to obtain successful and sensitive detection of lysozyme in urine and saliva samples. A plot of charge-transfer resistance versus the logarithm of the lysozyme concentration is linear in the 0.02 to 250 pM concentration range, with a 9 fM detection limit (at an S/N ratio of 3). The aptasensor is highly specific and selective. Clinical analyses were performed and data were found to be in good agreement with those obtained by HPLC. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Microchimica Acta Springer Journals

Ultrasensitive aptasensing of lysozyme by exploiting the synergistic effect of gold nanoparticle-modified reduced graphene oxide and MWCNTs in a chitosan matrix

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Publisher
Springer Vienna
Copyright
Copyright © 2017 by Springer-Verlag GmbH Austria
Subject
Chemistry; Nanochemistry; Nanotechnology; Characterization and Evaluation of Materials; Analytical Chemistry; Microengineering
ISSN
0026-3672
eISSN
1436-5073
D.O.I.
10.1007/s00604-017-2356-3
Publisher site
See Article on Publisher Site

Abstract

The authors describe a lysozyme aptasensor based on the use of gold nanoparticles (AuNP) assembled on the carbon nanotubes, graphene oxide and chitosan. An electrochemical impedance spectroscopic study was performed to demonstrate the synergistic effect of the MWCNT-AuNP, Chit-AuNP and GO-AuNP composites and the order of the layers affect the performance of aptasensing. Different parameters were optimized in order to obtain successful and sensitive detection of lysozyme in urine and saliva samples. A plot of charge-transfer resistance versus the logarithm of the lysozyme concentration is linear in the 0.02 to 250 pM concentration range, with a 9 fM detection limit (at an S/N ratio of 3). The aptasensor is highly specific and selective. Clinical analyses were performed and data were found to be in good agreement with those obtained by HPLC.

Journal

Microchimica ActaSpringer Journals

Published: Jun 19, 2017

References

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