Electromagnetic sensor

• US 6,342,347 B1
• Filed: 10/22/1999
• Issued: 01/29/2002
• Est. Priority Date: 10/22/1999
• 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:
  US09/426,564
• Time in Patent Office: 830 Days
• Field of Search: 435/4, 435/287.1, 435/289.1, 435/283.1, 204/403, 204/164
• US Class Current: 435/4
• 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 2333/205 from Campylobacter (G)
• CPC Class Codes: G01N 2333/924 acting on glycosyl compounds (3.2)
• CPC Class Codes: G01N 2333/98 acting on amide bonds in linear amides (3.5.1)
• CPC Class Codes: G01N 2333/986 acting on amide bonds in cyclic amides (3.5.2), e.g. beta-lactamase (penicillinase, 3.5.2.6), creatinine amidohydrolase (creatininase, EC 3.5.2.10), N-methylhydantoinase (3.5.2.6)
• CPC Class Codes: G01N 2333/99 Isomerases (5.)
• CPC Class Codes: G01N 2415/00 Assays, e.g. immunoassays or enzyme assays, involving penicillins or cephalosporins
• CPC Class Codes: G01N 33/5438 Electrodes
• CPC Class Codes: Y10S 977/906 Drug delivery
• CPC Class Codes: Y10S 977/932 for electronic or optoelectronic application

Abstract

The present invention relates to a sensor for analyte detection. The sensor makes use of changes in electrostatic fields associated with macromolecular binding agents during their interaction with analytes. Specifically, analyte presence leads to increases in magnetic flux generated by the motions of the binding agent electrostatic material. Magnetic or induced electrical signals may be monitored for change in order to detect analyte in a sample of interest.

Claims

1. A sensor for detecting the presence of an analyte in a sample, comprising:

(1) one or a plurality of base members, each having an electrically-conductive property;

(2) at least one macromolecular entity disposed proximate each base member and interactive at a level of specificity with a predetermined analyte, electron motions induced in said base member and responsive to the interaction of said macromolecular entity with analyte;

(3) a detection unit for detecting said induced electron motions.

2. The sensor according to claim 1, further comprising a conductive layer disposed proximate and electrically-contacted to said conductive base member.

3. The sensor according to claim 2, further comprising chemical layer disposed between said base member and said conductive layer.

4. The sensor according to claim 1, wherein said macromolecular entity comprises a first macromolecular entity capable of interacting at a first specificity and a second macromolecular entity capable of interacting at a second specificity for the detection of at least one analyte.

5. The sensor according to claim 2, wherein electrical leads of said detection unit are coupled to each base member and associated conductive layer at no more than two positions.

6. The sensor according to claim 1, wherein an electrode wire of a detection unit is placed in proximity to each sensor strip.

7. The sensor according to claim 1, wherein each base member is a conducting foil, coating, thin-film, ink, or solid piece.

8. The sensor according to claim 2, wherein said conductive layer has a semiconductive property.

9. The sensor according to claim 2, further comprising a packaging layer disposed above said macromolecular entity, said packaging layer being soluble in the sample medium.

10. The sensor according to claim 1, further comprising a unit to process a signal that is responsive to said induced electron motions.

11. A method for determining presence of an analyte in a sample, comprising the following steps:

(1) providing one or a plurality of electrically conductive base members;

(2) immobilizing at least one macromolecule in proximity to each base member, wherein said macromolecule is capable of interacting at a level of specificity with a predetermined analyte;

(3) exposing sample to at least one base member-macromolecule sensor strip;

(5) detecting by any means induced motions of electrons in each base member, and said induced electron motions are responsive to analyte presence; and

(6) comparing a signal caused by said induced electron motions to a known background signal determined in a sample that lacks analyte.

12. The method according to claim 11, further comprising the step of disposing a conductive layer proximate to at least one side of each base member.

13.The method according to claim 11, wherein said macromolecule comprises a first macromolecule capable of interacting at a first specificity and a second macromolecule capable of interacting at a second specificity for the detection of at least one analyte.

13. The method according to claim 12, wherein said step of detecting a signal is performed by contacting electrical leads of a detection unit to the conductive layer and the base member at no more than two positions.

14. The method according to claim 12, wherein an electrode wire is brought into proximity to each conductive layer.

15. The method according to claim 11, wherein each base member is a conducting foil, coating, thin-film, ink, or solid piece.

16. The method according to claim 12, wherein said conductive layer has a semiconductive property.

17. The method according to claim 12, further comprising the step of disposing a packaging layer above said macromolecules, said packaging layer being soluble in the sample medium.

18. The method according to claim 11, further comprising the step of processing said signal or a component thereof.

19. The method in accordance with claim 11, further comprising the steps of:

removing a portion of said sensor strip; and

submitting said removed portion to a detection system for analysis thereof.