Mr. Haitao Zheng Profile

Haitao Zheng

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Proceedings Article | 21 October 2009 Paper

Electrochemical properties of multilayer film assembled by layer-by-layer adsorption of redox polymer

Tao Sun, Haitao Zheng, Shiyang Liu, Pu Liu, Jingli Zhou, Shin-ichiro Suye

Proceedings Volume 7493, 74935T (2009) https://doi.org/10.1117/12.838442

KEYWORDS: Multilayers, Electrodes, Adsorption, Polymers, Polymer thin films, Gold, Quartz, Absorbance, Data modeling, Magnesium

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A redox polymer, poly(ethylenimine)ferrocene (PEI-Fc) was prepared by attaching electroactive ferrocene groups to the backbone of a water soluble, biocompatible polyelectrolyte, poly(ethylenimine), and multilayer film composed of polystyrenesulfonate sodium (PSS) and PEI-Fc was prepared by alternate layer-by-layer (LBL) self-assembly adsorption technique based on the electrostatic force between the opposite charges carried by these two polymers. UV-Vis spectra was used to monitor the LBL process, and the thickness and immobilization amount of each layer were characterized by quartz crystal microbalance (QCM), which showed the formation of nano-scale multilayer structure and linear mass increase dependent on the alternate adsorption cycles. The electrochemical properties of the PEI-Fc/PSS multilayer film modified gold electrode were investigated by cyclic voltammetry. It was observed clearly that the electrochemical properties of this multilayer film were strongly dependent on the layer number and the ferrocene content in PEI-Fc. The electrochemical kinetic was analyzed based on a general model for surface process, and the experimental data fitted well with that evaluated from the above model. This redox polymer showed potential for the construction of reagentless biosensor.

Proceedings Article | 21 October 2009 Paper

Bioelectrochemical activity of an electroactive macromolecular weight coenzyme derivative

Pu Liu, Haitao Zheng, Pingping Nie, Yaotian Wei, Zhenchao Feng, Tao Sun

Proceedings Volume 7493, 74934Y (2009) https://doi.org/10.1117/12.838551

KEYWORDS: Electrodes, Polymers, Biosensors, Solids, Gold, Magnesium, Bioalcohols, Biological research, Molecules, Oxidation

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As coenzyme utilized by more than hundreds of dehydrogenases, the efficient immobilization and regeneration of nicotinamide adenine dinucleotide (NAD+) are of great importance and have practical applications in industrial, analytical and biomedical field. In this paper, an electroactive macromolecular weight coenzyme derivative (PEI-DHBNAD) was prepared by attaching both NAD+ and 3,4-dihydroxybenzaldehyde (3,4-DHB) to a water-soluble polyelectrolyte, poly(ethylenimine) (PEI). The functional polymer exhibited both electrochemical properties of catechol unites and coenzymatic activity of NAD moieties. The macromolecular NAD analogue showed a substantial degree of efficiency relative to free NAD+ with alcohol dehydrogenase (ADH) and glucose-6-phophate dehydrogenase (G6PDH), and a litter higher Michaelis-Menton constant (Km) was obtained for the coenzyme derivative than free NAD+. The bioelectrochemical properties of PEI-DHB-NAD were investigated by using G6PDH as the model enzyme, and both of them were retained on electrode surface by ultrafiltration membrane. The modified electrode showed typical response to substrate without the addition of free coenzyme, which indicated that PEI-DHB-NAD can carry out the electron transfer between electrode and NAD-dependent dehydrogenase. The utilization of polymer-based PEI-DHB-NAD is convenient for the immobilization of both electron mediator and coenzyme, and offers a practical approach for the construction of reagentless biosensors.

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