کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1268911 | 972428 | 2008 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Hybridization biosensor using 2,9-dimethyl-1,10-phenantroline cobalt as electrochemical indicator for detection of hepatitis B virus DNA Hybridization biosensor using 2,9-dimethyl-1,10-phenantroline cobalt as electrochemical indicator for detection of hepatitis B virus DNA](/preview/png/1268911.png)
A label-free biosensor for the detection of oligonucleotides related to hepatitis B virus sequence via the interactions of DNA with redox-active complex, 2,9-dimethyl-1,10-phenantroline cobalt [Co(dmp)(H2O)(NO3)2] is described. The study was carried out by the hybridization of 21-mer probe DNA modified on glassy carbon electrode (GCE) with target DNA, and [Co(dmp)(H2O)(NO3)2] whose sizes are comparable to those of the small groove of native double-helix DNA was used as an electrochemical indicator. Electrochemical detection was performed by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) over the potential range where the [Co(dmp)(H2O)(NO3)2] was active. Under the optimum conditions, the electrical signal had a linear relationship with the concentration of target DNA ranging from 3.96 × 10− 7 to 1.32 × 10− 6 M, and the detection limit was 1.94 × 10− 8 M (S/N = 3). The biosensor has good selectivity by detecting the three-base mismatch sequence ssDNA.
Journal: Bioelectrochemistry - Volume 72, Issue 1, February 2008, Pages 28–33