A novel electrochemical biosensor, comprising a tetracycline aptamer immobilised on nano-porous silicon (PS), was investigated for the rapid detection of tetracyclines. . Electrochemical impedance spectroscopy (EIS) was used to analyse the behavior of the sensor. The specific binding of tetracycline to the aptamer biosensor led to a decrease in impedance. The corresponding impedance spectra (Nyquist plots) were obtained when serial concentrations of tetracycline were added into the system. An equivalent electrical circuit was used to fit the impedance data obtained. The linear range of the sensor was 2.079-62.37nM ..
In this study, a carbon electrode electroless polymerization of polypyrrole, which formed a layer of conductive film interface,then absorped a layer of carbon nanotube particles by the way of self-assembled, is studied. The modified electrode is used to electrostatic adherence of formaldehyde dehydrogenase, with Nafion solution capped. Moreover this paper discusses the work of electrode position, PH value and scanning speed on the influence of the electrode response, the response potential is-1.2v, the optimal PH value is 7.5, and we also review the linear range of this electrode, we discovered taht this biosensor have a good linear relationship with the concentration of 1ug/ml-360ug/ml, the Correlation coefficient is 0.9983. In addition,with the stability of this electrode tested, it can be stored 15d at 4°C.
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