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Proceedings Paper

Bioelectrochemical activity of an electroactive macromolecular weight coenzyme derivative
Author(s): Pu Liu; Haitao Zheng; Pingping Nie; Yaotian Wei; Zhenchao Feng; Tao Sun
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Paper Abstract

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.

Paper Details

Date Published: 21 October 2009
PDF: 7 pages
Proc. SPIE 7493, Second International Conference on Smart Materials and Nanotechnology in Engineering, 74934Y (21 October 2009); doi: 10.1117/12.838551
Show Author Affiliations
Pu Liu, Tianjin Polytechnic Univ. (China)
Haitao Zheng, Tianjin Polytechnic Univ. (China)
Pingping Nie, Tianjin Polytechnic Univ. (China)
Yaotian Wei, Tianjin Polytechnic Univ. (China)
Zhenchao Feng, Tianjin Polytechnic Univ. (China)
Tao Sun, Tianjin Polytechnic Univ. (China)


Published in SPIE Proceedings Vol. 7493:
Second International Conference on Smart Materials and Nanotechnology in Engineering

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