Journal
ELECTROANALYSIS
Volume 18, Issue 15, Pages 1449-1456Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.200603566
Keywords
aptamer; impedance; protein biosensor; thrombin
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A label-free electrochemical impedance based protein biosensor was introduced by using aptamer as recognition tool. Our sensing protocol utilizes the affinity interaction between the thrombin and the self-assembled DNA aptamer on gold electrode. This specific interaction increases the electrode interfacial electronic transfer resistance. The resistance signal is then amplified by using guanidine hydrochloride to denature the captured thrombin for increasing the hydrated radius of the thrombin, consequently blocking the electron transfer from solution to electrode. The sensor sensitivity is improved using this strategy and as low as 1.0 x 10(-14) mol L-1 thrombin (enzymatic activity 10 U/mg) can be detected out.
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