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.
Microchimica Acta – Springer Journals
Published: Jun 19, 2017
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