%0 Journal Article
%T Oriented Immobilization of His-Tagged Protein on a Redox Active Thiol Derivative of DPTA-Cu(II) Layer Deposited on a Gold Electrode〞The Base of Electrochemical Biosensors
%A Edyta Mikuˋa
%A Magdalena Sulima
%A Ilona Marszaˋek
%A Aleksandra Wysˋouch-Cieszy里ska
%A Peter Verwilst
%A Wim Dehaen
%A Jerzy Radecki
%A Hanna Radecka
%J Sensors
%D 2013
%I MDPI AG
%R 10.3390/s130911586
%X This paper concerns the development of an electrochemical biosensor for the determination of A汕16每23' and A汕1每40 peptides. The His-tagged V and VC1 domains of Receptor for Advanced Glycation end Products (RAGE) immobilized on a gold electrode surface were used as analytically active molecules. The immobilization of His6每RAGE domains consists of: (i) formation of a mixed layer of N-acetylcysteamine (NAC) and the thiol derivative of pentetic acid (DPTA); (ii) complexation of Cu(II) by DPTA; (iii) oriented immobilization of His6每RAGE domains via coordination bonds between Cu(II) sites from DPTA每Cu(II) complex and imidazole nitrogen atoms of a histidine tag. Each modification step was controlled by cyclic voltammetry (CV), Osteryoung square-wave voltammetry (OSWV), and atomic force microscopy (AFM). The applicability of the proposed biosensor was tested in the presence of human plasma, which had no influence on its performance. The detection limits for A汕1每40 determination were 1.06 nM and 0.80 nM, in the presence of buffer and human plasma, respectively. These values reach the concentration level of A汕1每40 which is relevant for determination of its soluble form in human plasma, as well as in brain. This indicates the promising future application of biosensor presented for early diagnosis of neurodegenerative diseases.
%K pentetic acid每Cu(II) complex
%K gold electrodes
%K His-tagged proteins
%K A汕 peptides
%K electrochemical biosensor
%U http://www.mdpi.com/1424-8220/13/9/11586