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- W2008142499 abstract "We have performed a comparative study on four protocols for the immobilization of the thrombin aptamer on a graphite-epoxy composite electrode with the aim to identify the most practical method for designing the corresponding impedimetric aptasensor. The protocols included (a) physical adsorption, (b) avidin-biotin affinity interaction, (c) electrochemical activation and covalent bonding via amide groups, and (d) electrochemical grafting using 4-carboxybenzenediazonium coupling. The properties of the sensing surface were probed by electrochemical impedance measurements in the presence of the (ferri/ferro)hexacyanide redox couple. An increase in the interfacial charge transfer resistance (Rct) was noted in all cases after the aptamer-thrombin interaction had occurred. The selectivity of the aptasensor over common serum proteins was also systematically investigated. Physical adsorption resulted in the lowest detection limit of the probe (4.5 pM), while avidin-biotin interaction resulted in highest selectivity and reproducibility exhibiting a 4.9 % relative standard deviation at pM thrombin concentration levels." @default.
- W2008142499 created "2016-06-24" @default.
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- W2008142499 date "2013-11-14" @default.
- W2008142499 modified "2023-10-12" @default.
- W2008142499 title "A comparison of four protocols for the immobilization of an aptamer on graphite composite electrodes" @default.
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- W2008142499 doi "https://doi.org/10.1007/s00604-013-1126-0" @default.
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