Electrochemical regeneration of NADH using conductive vanadia-silica xerogels.

Article Details

Citation

Copy to clipboard

Siu E, Won K, Park CB

Electrochemical regeneration of NADH using conductive vanadia-silica xerogels.

Biotechnol Prog. 2007 Jan-Feb;23(1):293-6.

PubMed ID

17269701 [ View in PubMed

]

Abstract

Electrically conductive sol-gel matrices have been first introduced in order to enhance the efficiency of electrochemical NADH regeneration systems for biocatalysis. Vanadia-silica mixed gels as conductive sol-gels were synthesized using vanadium (V) oxytripropoxide (VOTP) and tetramethyl orthosilicate (TMOS) as precursors. Direct electrochemical reductions of NAD+ were carried out in the presence of vanadia-silica xerogels using unmodified platinum electrodes. Vanadia-silica gels from higher ratios of VOTP to TMOS could effectively improve electrochemical generations of NADH from NAD+. Direct electrochemical regenerations of NADH were coupled to the synthesis of l-glutamate from alpha-ketoglutarate catalyzed by glutamate dehydrogenases (GDH). In this case, vanadia-silica gels were used as matrices for enzyme encapsulation, as opposed to serving as additives. When GDH were entrapped in "nonconductive" silica gels, synthesized using only TMOS, in the control experiment, the initial supply of NADH exhausted quickly and a final conversion of 30% was obtained. However, the use of conductive vanadia-silica gels with encapsulated GDH resulted in complete conversion of alpha-ketoglutarate to l-glutamate. A turnover number of a cofactor was also enhanced 3-fold by the application of conductive vanadia-silica gels.

DrugBank Data that Cites this Article

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
NADH	GDH/6PGL endoplasmic bifunctional protein	Protein	Humans	Unknown	Not Available	Details