Chitosan-graphene oxide based aptasensor for the impedimetric detection of lysozyme

WOS: 000335101600028PubMed ID: 24362059An impedimetric detection of lysozyme (LYS) was performed for the first time in this study at the surface of chitosan-graphene oxide (CHIT-GO) modified sensor based on the specific interaction process between DNA aptamer and its cognate protein, LYS. The amino linked DNA aptamer (APT) was covalently immobilized without using any chemical agents onto the surface of pencil graphite electrode (PGE). These PGEs are inexpensive and simple to use, and thus, they can be furtherly developed for a single-use application in a portable protein chip device. The electrochemical impedance spectroscopy (EIS) technique was used herein to analyze (i) the surface characterization of unmodified PGE and CHIT-GO modified PGE, and also (ii) the interaction between APT and LYS. The limit of detection (DL) was found as 0.38 mu g/mL (equals to 28.53 nM). This impedimetric LYS aptasensor exhibited a higher selectivity toward thrombin and bovine serum albumin, even in the mixture samples. (C) 2013 Elsevier B.V. All rights reserved.Turkish Academy of Sciences (TUBA)Turkish Academy of Sciences; Turkish Scientific and Technological Council (TUBITAK) through the master scholarship of TUBITAK ProjectTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [212T082]A.E. would like to express her gratitude to the Turkish Academy of Sciences (TUBA) as an Associate member for its partial support. She also would like to thank Nanoinnova Technologies SL (Spain) for kindly donating GO for this study. E.E. acknowledges the financial support from the Turkish Scientific and Technological Council (TUBITAK) through the master scholarship of TUBITAK Project No. 212T082