Thermoelectric biosensor for analytes in a gas

• US 20110125408A1
• Filed: 12/18/2007
• Published: 05/26/2011
• Est. Priority Date: 04/28/2003
• Status: Abandoned Application

• Current Assignee: Invoy Technologies, LLC
• Original Assignee: Invoy Technologies, LLC
• Inventors: Ahmad, Lubna M.
• Application Number:
  US12/002,901
• Publication Number:
  US 20110125408A1
• Time in Patent Office: Days
• US Class Current: 702/19
• CPC Class Codes: G01N 25/4813 concerning the measuring means
• CPC Class Codes: G01N 25/4873 for a flowing, e.g. gas sample
• CPC Class Codes: G01N 33/497 of gaseous biological material, e.g. breath

Abstract

A biosensor for detecting at least one analyte in a gas includes a capture apparatus, a thermoelectrical sensor, and a microprocessor attached to the first ends of a first lead and a second lead, the two leads having second ends attached to the two contact pads of a thermopile whose difference is converted to concentration of the analyte and shown on an electronic display. The thermoelectrical sensor has a layer of at least one interactant, at least one thermopile and an insulator. The interactant with the analyte produces or consumes heat which is transferred to the thermopile which develops a voltage difference that causes the microprocessor to convert the voltage an indication of the analyte.

Claims

1. A biosensor for detecting at least one analyte in a gas, the biosensor comprising:

a) a capture apparatus; and

b) a thermoelectric sensor, the sensor comprising a layer of at least one analyte interactant that increases or decreases in temperature and at least one thermopile, said at least one thermopile having a first contact pad and a second contact pad;

wherein the passage of gas containing the analyte through the capture apparatus brings the analyte into contact with the interactant and produces or consumes heat, which is transmitted to the thermopile that then produces a voltage difference and measures the analyte.

2. The biosensor of claim 1, wherein the interactant is selected from a chemical reactant, catalyst, adsorbent, absorbent, vaporization agent or a combination thereof.

3. The biosensor of claim 1, wherein the biosensor further comprises multiple thermopiles, each having the same or different interactants.

4. The biosensor of claim 1, wherein the interactant is selected from sodium hypochlorite, sodium monochloroisocyanurate, sodium trichloroisocyanurate, salt, nitrosyl chloride, chloroform or a combination thereof.

5. The biosensor of claim 36, wherein the microprocessor also communicates with an electronic display, noise maker, other output or a combination thereof.

6. The biosensor of claim 1, wherein the analyte is acetone, whose presence indicates the presence of ketones in the bloodstream.

7. The biosensor of claim 1, wherein the analyte is alcohol and the interactant is selected from chromium trioxide, alcohol dehydrogenase, alcohol oxidase, acetoalcohol oxidase or a combination thereof.

8. The biosensor of claim 1, wherein the interactants are specific for ethanol and alkanes, thereby indicating various pathologies, such as breast cancer and transplant rejection.

9. The biosensor of claim 1, wherein the interactant is specific for airborne environmental toxins or classes of toxins, and other airborne components of gas mixtures, thereby detecting these compounds.

10. The biosensor of claim 1, wherein the thermopile comprises metals, alloys, semiconductor materials, or liquid thermoelectric materials.

11. The biosensor of claim 1, wherein the analyte interactant comprises biologically active materials comprising cells, cell organelles, micro-organisms or genetically modified organisms.

12. The biosensor of claim 1, wherein compounds present in the gas other than the analyte of interest facilitate the production or consumption of heat.

36. The biosensor of claim 1, wherein the biosensor further comprises

c) a microprocessor attached to first ends of a first lead and a second lead, the first lead having a second end attached to said first thermopile contact pad and the second lead having a second end attached to said second thermopile contact pad,

whereby the voltage difference produced by the thermopile is registered in the microprocessor, which converts the voltage so as to measure the analyte.

37. The biosensor of claim 36, wherein multiple thermopiles, each having the same or different interactants, are each independently connected to the microprocessor via two leads.

13. (canceled)

14. A method of detecting an analyte in a gas by thermoelectric sensor, the method comprising

a) providing a thermoelectric sensor, the sensor comprising

i) a layer of at least one analyte interactant that when combined with the analyte, gives off or consumes heat;

and

ii) at least one thermopile to which the heat change is transferred, which then registers a voltage difference, the at least one thermopile having a first contact pad and a second contact pad;

b) passing a gas containing the airborne analyte over the thermoelectric sensor; and

c) indicating the presence or quantity of the analyte.

15. The method of claim 14, wherein the step a of providing the thermoelectric sensor comprises providing an analyte interactant specific for acetone and step c comprises a display indicating the presence of acetone, whereby lipid metabolism is indicated.

16. The method of claim 14, wherein the provided thermoelectric sensor has multiple thermopiles, each having the same or different analyte interactants, whereby the presence of single or multiple analytes are indicated.

17. The method of claim 14, wherein step c also comprises indicating the concentration of the analyte.

38. The method of claim 14, wherein the thermoelectric sensor provided in step a. further comprises

iii) a microprocessor attached to first ends of a first lead and a second lead, the first lead having a second end attached to the first thermopile contact pad and the second lead having a second end attached to the second thermopile contact pad, the microprocessor also communicating with a signal device.

39. The method of claim 38, wherein the provided thermoelectric sensor has multiple thermopiles, each having the same or different analyte interactants and each being connected to the microprocessor by two leads, whereby the presence of single or multiple analytes are indicated.

18-35. -35. (canceled)