Impedimetric biosensor and its use for rapid detection of bacterial pathogens in solution
First Claim
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1. A device for detecting a microorganism which comprises:
- (a) a holder means with an electrode means;
(b) a detection sensor mounted on the holder means in contact with the electrical means, the sensor having spaced apart interdigitated electrodes providing a capacitor and with a capture reagent for the microorganism at least between the electrodes, wherein widths of a space between the electrodes and of the electrodes are each about 5 microns or less, and wherein when the microorganism in a liquid is captured by the capture reagent, the detection sensor is interrogated with an electric circuit producing a change of impedance from the detection sensor without the bound microorganism, thereby detecting the presence of the microorganism.
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Abstract
A method and device for the rapid detection of microorganisms by detection of a change of impedance as a result of the microorganism being bound between interdigitated electrodes is described. In particular, the present invention relates to a handheld device to be used for the detection and, in many instances, the identification of the microorganism.
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Citations
47 Claims
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1. A device for detecting a microorganism which comprises:
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(a) a holder means with an electrode means;
(b) a detection sensor mounted on the holder means in contact with the electrical means, the sensor having spaced apart interdigitated electrodes providing a capacitor and with a capture reagent for the microorganism at least between the electrodes, wherein widths of a space between the electrodes and of the electrodes are each about 5 microns or less, and wherein when the microorganism in a liquid is captured by the capture reagent, the detection sensor is interrogated with an electric circuit producing a change of impedance from the detection sensor without the bound microorganism, thereby detecting the presence of the microorganism. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for detecting a microorganism which comprises:
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(a) providing a device which comprises a holder means with an electrode means;
a detection sensor mounted on the holder means in contact with the electrode means, the sensor having spaced apart interdigitated electrodes providing a capacitor and with a capture reagent for the microorganism at least between the electrodes and wherein widths of spaces between each of the electrodes and of the electrodes are each about 5 microns or less, and wherein when the microorganism in a liquid is captured by the capture reagent, the detection sensor is interrogated with an electric circuit producing a change of impedance from the detection sensor without the bound microorganism, thereby detecting the presence of the microorganism;
(b) inserting the detection sensor into a liquid suspected of containing the microorganism;
(c) washing the biosensor to remove any unbound material; and
(d) determining the change of impedance from the detection sensor by interrogating the detection sensor with the electronic circuit to thereby detect the microorganisms. - View Dependent Claims (8, 9)
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10. A device for detecting an analyte in a solution, which comprises:
a biosensor comprising (i) a substrate material having a surface;
(ii) an interdigitated array of at least two electrodes disposed on the surface of the substrate wherein a width of a space between the electrodes and of the electrodes are each about 5 microns or less; and
(iii) at least one covalently bound antibody which is specific for the analyte immobilized at least on the surface of the substrate in the space between the electrodes. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for detecting an analyte in a liquid sample, which comprises:
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(a) providing a device comprising a biosensor comprising (i) a substrate material having a surface;
(ii) an interdigitated array of at least two electrodes disposed on the surface of the substrate wherein widths of a space between the electrodes and of the electrodes are each about 5 microns or less in width; and
(iii) at least one covalently bound antibody which is specific for the analyte immobilized at least on the surface of the substrate in the space between the electrodes; and
(b) immersing the biosensor of the device in the liquid sample for a time sufficient for the antibody to bind the analyte;
(c) removing the biosensor of the device from the liquid sample and immersing the biosensor of the device in a neutral solution; and
(d) applying a current to the biosensor of the device and measuring the impedance of the current wherein an increase in the impedance indicates the liquid sample has the analyte. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method for detecting a microorganism in a liquid sample, which comprises:
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(a) providing a device comprising a biosensor comprising (i) a substrate material having a surface;
(ii) an interdigitated array of at least two electrodes disposed on the surface of the substrate wherein widths of a space between the electrodes and of the electrodes are each about 5 microns or less in width;
(iii) at least one covalently bound antibody which is specific for the analyte immobilized at least on the surface of the substrate in the space between the electrodes; and
(b) immersing the biosensor of the device in the liquid sample for a time sufficient for the antibody to bind the microorganism;
(c) removing the biosensor of the device from the liquid sample and immersing the biosensor of the device in a neutral solution; and
(d) applying a current to the biosensor of the device and measuring the impedance of the current wherein an increase in the impedance indicates the liquid sample has the microorganism. - View Dependent Claims (35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
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34. A method for identifying a microorganism in a liquid sample, which comprises:
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(a) providing a device comprising a biosensor comprising (i) a substrate material having a surface;
(ii) an interdigitated array of at least two electrodes disposed on the surface of the substrate wherein widths of a space between the electrodes and of the electrodes are each about 5 microns or less; and
(iii) at least one covalently bound antibody which is specific for the analyte immobilized at least on the surface of the substrate in the space between the electrodes; and
(b) immersing the biosensor of the device in the liquid sample for a time sufficient for the antibody to bind the microorganism;
(c) removing the biosensor of the device from the liquid sample and immersing the biosensor of the device in water; and
(d) applying a current to the biosensor of the device and measuring the impedance of the current wherein an increase in the impedance to a particular amount identifies the microorganism.
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Specification