Journal
ANALYTICA CHIMICA ACTA
Volume 645, Issue 1-2, Pages 30-35Publisher
ELSEVIER
DOI: 10.1016/j.aca.2009.04.047
Keywords
Deoxyribonuclease I; Electrochemical detection; Ferrocenyloligonucleotide; Ferrocenylcarbodiimide
Categories
Funding
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan
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A ferrocenyloligonucleotide (FcODN) having contiguous cytosine bases was immobilized effectively and reproducibly on a gold electrode furnished with a self-assembled monolayer (SAM) having an N-hydroxysuccinimide-activated carboxylic acid. The resulting electrode was used as a sensor chip in DNase I assay. Thus, the current response of the modified electrode decreased upon addition of DNase I, demonstrating that the phosphodiesterbonds of FcODN were cleaved. The DNase I activity assessed by Delta i defined as (i(0)-i)/i(0), where i(0) and i represent the current before and after DNase I treatment, respectively, was found to be reproducible with a standard deviation not greater than 9%. The DNase I can be quantitated in the range of 10(-5) to 10(-3) units mu L-1 with a detection limit of 10(-5) units mu L-1 with this sensor chip. The current signal of the FcODN electrode was stable to storage in Biopak water up to 16 days with a 30% signal decrease over this period. DNase I activity in human sera was also determined successfully with this sensor chip. (C) 2009 Elsevier B.V. All rights reserved.
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