Sato S, Fujita K, Kanazawa M, Mukumoto K, Ohtsuka K, Waki M, Takenaka S. Electrochemical assay for deoxyribonuclease I activity.
Anal Biochem 2008;
381:233-9. [PMID:
18674511 DOI:
10.1016/j.ab.2008.07.014]
[Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2008] [Revised: 07/11/2008] [Accepted: 07/15/2008] [Indexed: 10/21/2022]
Abstract
A thiolated oligonucleotide having three ferrocenes was immobilized on a gold electrode through the sulfur-gold linkage. This electrode showed a current response based on the redox reaction of the ferrocene moieties and this response was decreased after treatment with deoxyribonuclease I (DNase I), suggesting the disappearance of the ferrocene moieties on the electrode by the DNase I digestion. A linear correlation between i(0) and i, which are current peaks before and after DNase I treatment, respectively, was observed and this slope was decreased with increase in the amount of DNase I. No current decrease was observed in the presence of EDTA or RNase A instead of DNase I. These results suggested that the current decrease responded specifically to the amount of DNase I and this electrode could be used for an electrochemical DNase I assay. Under the optimum conditions of DNase I digestion at 37 degrees C for 30 min, a quantitative analysis could be achieved in the range of 10(-4)-10(-2)units/microl of DNase I.
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