Protein detection method
First Claim
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1. A method for electrochemical detection of cancer antigen 125 (CA-125), comprising:
- providing a nanostructured microelectrode including a linker on its surface, the linker being attached to an antibody or fragment thereof capable of binding CA-125;
contacting the nanostructured microelectrode with a sample including CA-125 and with a redox reporter, wherein binding of CA-125 to the antibody or fragment thereof hinders electron transfer between the redox reporter and the nanostructured microelectrode, the nanostructured microelectrode having a diameter of about 100 microns or less, the nanostructured microelectrode having a detection limit for CA-125 from about 0.1 U/ml to about 10 U/ml;
applying a potential to the nanostructured microelectrode;
measuring, in response to the applied potential, an electrochemical signal generated by the nanostructured microelectrode; and
comparing the electrochemical signal to a control signal;
deeming a change of the electrochemical signal detected relative to the control signal as indicative of the presence of CA-125 in the sample.
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Abstract
Described herein are systems and methods for detecting a target analyte in a sample with electrodes, comprising a linker and an antibody attached to the linker, and measuring an electrocatalytic signal changes generated by binding of an analyte in the sample to the antibody. Also disclosed herein are kits for electrochemical detection of protein analytes.
14 Citations
14 Claims
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1. A method for electrochemical detection of cancer antigen 125 (CA-125), comprising:
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providing a nanostructured microelectrode including a linker on its surface, the linker being attached to an antibody or fragment thereof capable of binding CA-125; contacting the nanostructured microelectrode with a sample including CA-125 and with a redox reporter, wherein binding of CA-125 to the antibody or fragment thereof hinders electron transfer between the redox reporter and the nanostructured microelectrode, the nanostructured microelectrode having a diameter of about 100 microns or less, the nanostructured microelectrode having a detection limit for CA-125 from about 0.1 U/ml to about 10 U/ml; applying a potential to the nanostructured microelectrode; measuring, in response to the applied potential, an electrochemical signal generated by the nanostructured microelectrode; and comparing the electrochemical signal to a control signal; deeming a change of the electrochemical signal detected relative to the control signal as indicative of the presence of CA-125 in the sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 12, 13)
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9. A method for monitoring progression or response in a subject having cancer by electrochemical detection of cancer antigen 125 (CA-125) in a biological sample of the subject, comprising:
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providing a nanostructured microelectrode including a linker on its surface, the linker being attached to an antibody or fragment thereof; contacting the nanostructured microelectrode with the biological sample and with a redox reporter, wherein binding of CA-125 to the antibody or fragment thereof hinders electron transfer between the redox reporter and the nanostructured microelectrode, the nanostructured microelectrode having a diameter of about 100 microns or less, the nanostructured microelectrode having a detection limit for CA-125 from about 0.1 U/ml to about 10 U/ml; applying a potential to the nanostructured microelectrode; measuring in response to the applied potential, an electrochemical signal generated by the nanostructured microelectrode; and comparing the electrochemical signal to a control signal; deeming a change of the electrochemical signal detected relative to the control signal as indicative of the presence of CA-125 in the biological sample. - View Dependent Claims (11, 14)
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Specification