Analytic sensor apparatus and method

• US 6,503,701 B1
• Filed: 11/21/2001
• Issued: 01/07/2003
• Est. Priority Date: 06/15/1999
• Status: Expired due to Fees

• Current Assignee: Biosensor Systems Design, Inc.
• Original Assignee: Biosensor Systems Design, Inc.
• Inventors: Bauer, Alan Joseph
• Primary Examiner(s): Leary, Louise N.
• Application Number:
  US09/979,354
• Time in Patent Office: 412 Days
• Field of Search: 435/4, 435/287.1, 435/289.1, 435/283.1
• US Class Current: 435/4
• CPC Class Codes: B82Y 15/00 Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C12Q 1/002 Electrode membranes
• CPC Class Codes: G01N 33/5438 Electrodes
• CPC Class Codes: G01N 33/66 involving blood sugars, e.g. galactose
• CPC Class Codes: Y10S 977/881 Microscopy or spectroscopy, e.g. sem, tem
• CPC Class Codes: Y10S 977/925 Bioelectrical

Abstract

A sensor for detecting analytes of interest is described. Analyte presence or concentration is determined through measurement of changes in induced electromotive force, current or other electrical property in a sensor strip during analyte exposure to the sensor. According to one class of embodiments, the present device immobilizes natural or synthetic macromolecules sufficiently close to an electrically-conductive base member to insure that interaction of analyte with the macromolecules will lead to altered de novo electrical signals in the sensor strip of base member and macromolecules. Performance of the sensor is enhanced by the use of resistance-modifying element in a circuit that includes the sensor strip, and by an adhesive agent disposed between the base member and at least one electrical lead of a detection unit.

Claims

1. A sensor for detecting an analyte, comprising:

a base member having a conductive electrical property;

a macromolecular layer, wherein said macromolecular layer and said base member define a sensor strip, macromolecules of said macromolecular layer being interactive at a level of specificity with a predetermined analyte, wherein electrical current is generated responsive to presence of the analyte; and

a semiconductive element situated between said base member and a detection unit that is connectable with said base member to establish a sensor circuit for detection of said electrical current.

2. The sensor according to claim 1, further comprising a chemical entity disposed between said base member and said macromolecular layer.

3. The sensor according to claim 1, further comprising two equipotential electrodes coupling said sensor strip to said detection unit.

4. The sensor according to claim 3 wherein said semiconductive element is physically associated with at least one of said electrodes.

5. The sensor according to claim 1, wherein said semiconductive element is physically associated with said sensor strip.

6. The sensor according to claim 1, wherein said semiconductive element is physically associated with the detection unit.

7. The sensor according to claim 1, wherein said base member is an electrically conducting foil.

8. The sensor according to claim 1 wherein said base member is an electrically conductive coating.

9. The sensor according to claim 1 wherein said base member is an electrically conductive thin film.

10. The sensor according to claim 1, wherein said base member is an electrically conductive ink.

11. The sensor according to claim 1, wherein said base member is an electrically conductive solid piece.

12. The sensor according to claim 1, wherein said base member is an electrically semiconducting foil.

13. The sensor according to claim 1, wherein said base member is an electrically semiconductive coating.

14. The sensor according to claim 1, wherein said base member is an electrically semiconductive thin-film.

15. The sensor according to claim 1, wherein said base member is an electrically semiconductive ink.

16. The sensor according to claim 1, wherein said base member is an electrically semiconductive solid piece.

17. The sensor according to claim 1, further comprising a packaging layer disposed above said macromolecular layer, said packaging layer being soluble in a medium that contains the analyte.

18. The sensor according to claim 1, wherein said sensor strip comprises a plurality of sensor strips.

19. A method for detecting a predetermined analyte, comprising the steps of:

providing an electrically conductive base member;

forming a macromolecular layer in proximity to said base member, wherein macromolecules of said macromolecular layer are interactive with said predetermined analyte, said base member and said macromolecular layer defining a sensor strip;

exposing said predetermined analyte to said macromolecular layer;

establishing a closed electrical circuit comprising said base member, a detection unit and at least one semiconductive element;

detecting an electrical current generated in said electrical circuit, said current being responsive to presence of said predetermined analyte.

20. The method according to claim 19, further comprising the steps of:

disposing a chemical entity proximate said base member; and

forming said macromolecular layer proximate said chemical entity.

21. The method according to any of claim 19, wherein said step of detecting is performed by equipotentially coupling electrodes of said detection unit to said sensor strip.

22. The method according to claim 21, wherein said step of coupling is performed by passively contacting said electrodes to said sensor strip.

23. The method according to claim 21, wherein said semiconductive element is an organic semiconductor physically associated with one of said electrodes.

24. The method according to any of claim 19, wherein said semiconductive element is an organic semiconductor physically associated with said sensor strip.

25. The method according to any of claim 19, further comprising the step of disposing a packaging layer above said macromolecular layer, said packaging layer being soluble in a medium that contains said predetermined analyte.

26. The method according to claim 19, wherein said sensor strip comprises a plurality of sensor strips.

27. The method according to claim 19, further comprising the step of conducting said current to a device that is external to said sensor strip.