Nanorods of a new metal-biomolecule coordination polymer showing novel bidirectional electrocatalytic activity and excellent performance in electrochemical sensing

Metal organic coordination polymers (CPs), as most attractive multifunctional materials, have been studied extensively in many fields. However, metal-biomolecule CPs and CPs' electrochemical properties and applications were studied much less. We focus on this topic aiming at electrochemical bio...

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Bibliographic Details
Published in:Biosensors & bioelectronics 2015-05, Vol.67, p.66-72
Main Authors: Yang, Jiao, Zhou, Bo, Yao, Jie, Jiang, Xiao-Qing
Format: Article
Language:English
Subjects:
Bidirectional
Biosensing Techniques
Biosensors
Coordination polymers
Detection
Electrodes
Hydrogen Peroxide - chemistry
Hydrogen Peroxide - isolation & purification
Manganese
Manganese - chemistry
Metal Nanoparticles - chemistry
Metals - chemical synthesis
Metals - chemistry
Nanostructure
Nanotubes - chemistry
Nanotubes, Carbon - chemistry
Oxidation-Reduction
Polymers - chemical synthesis
Polymers - chemistry
Tyrosine
Tyrosine - chemical synthesis
Tyrosine - chemistry
X-ray photoelectron spectroscopy
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Summary:Metal organic coordination polymers (CPs), as most attractive multifunctional materials, have been studied extensively in many fields. However, metal-biomolecule CPs and CPs' electrochemical properties and applications were studied much less. We focus on this topic aiming at electrochemical biosensors with excellent performance and high biocompatibility. A new nanoscaled metal-biomolecule CP, Mn-tyr, containing manganese and tyrosine, was synthesized hydrothermally and characterized by various techniques, including XRD, TEM, EDS, EDX mapping, elemental analysis, XPS, and IR. Electrode modified with Mn-tyr showed novel bidirectional electrocatalytic ability toward both reduction and oxidation of H2O2, which might be due to Mn. With the assistance of CNTs, the sensing performance of Mn-tyr/CNTs/GCE was improved to a much higher level, with high sensitivity of 543 mA mol(-1) L cm(-2) in linear range of 1.00×10(-6)-1.02×10(-4) mol L(-1), and detection limit of 3.8×10(-7) mol L(-1). Mn-tyr/CNTs/GCE also showed fast response, high selectivity, high steadiness and reproducibility. The excellent performance implies that the metal-biomolecule CPs are promising candidates for using in enzyme-free electrochemical biosensing.
ISSN:0956-5663
1873-4235
DOI:10.1016/j.bios.2014.06.047