Detection of contaminants in food

• US 5,306,466 A
• Filed: 05/19/1993
• Issued: 04/26/1994
• Est. Priority Date: 05/19/1993
• Status: Expired due to Term

• Current Assignee: SIRF Technology Incorporated (Qualcomm, Inc.)
• Original Assignee: CALIFORNIA SOUTH PACIFIC INVESTORS
• Inventors: Goldsmith, Robert M.
• Primary Examiner(s): ALEXANDER, LYLE
• Application Number:
  US08/064,521
• Time in Patent Office: 342 Days
• Field of Search: 422/56, 422/58, 422/61, 436/1, 436/164, 426/232, 116/206
• US Class Current: 422/403
• CPC Class Codes: G01N 31/22 using chemical indicators G01N31/02 takes precedence
• CPC Class Codes: G01N 31/221 for investigating pH value
• CPC Class Codes: G01N 33/5308 for analytes not provided for elsewhere, e.g. nucleic acids, uric acid, worms, mites
• CPC Class Codes: G01N 33/54366 Apparatus specially adapted for solid-phase testing
• CPC Class Codes: G01N 33/56916 Enterobacteria, e.g. shigella, salmonella, klebsiella, serratia

Abstract

A food contamination detector. The detector comprises a tray for holding a food product. A collector is placed in the tray for collecting liquids from the food. A bar code detector is located in the collector.

Claims

1. A food contamination detector for identifying the presence of toxins in food comprising:

a toxin printed onto a substrate; and

an indicator bound to the toxin to form a bar code on the substrate such that when the detector is contacted with a toxin, specific for the indicator, the indicator is removed from the substrate, destroying the bar code and thereby indicating the presence of the toxin in the food.

2. A food contamination detector as recited in claim 1 wherein the toxins are selected from the group consisting of Salmonella sp., Listeria Sp., E. coli, ciguatoxin and related marine polyethers, domoic acid and aflatoxin.

3. A food contamination detector as recited in claim 1 wherein the substrate comprises a transparent membrane.

4. A food contamination detector as recited in claim 1 wherein the indicator comprises an antibody bound to a latex bead.

5. A food contamination detector as recited in claim 4 wherein the antibody is selected from the group consisting of monoclonal antibodies and polyclonal antibodies.

6. A food contamination detector for identifying the presence of toxins in food comprising:

a first toxin printed onto a substrate at a first position;

a second toxin printed onto a substrate at a second position;

a first indicator bound to the first toxin;

a second indicator bound to the second toxin such that the first and second indicators form parallel bars on the substrate which can be detected by an optical scanner and where the presence of a food sample containing a contaminant specific for the indicators will cause the indicator to become unbound and efface the parallel bar pattern to thereby indicate the food is contaminated.

7. A food contamination detector as recited in claim 6 wherein the toxins are selected from the group consisting of Salmonella sp., Listeria Sp., E. coli, ciguatoxin and related marine polyethers, domoic acid and aflatoxin.

8. A food contamination detector as recited in claim 6 wherein the substrate comprises a transparent membrane.

9. A food contamination detector as recited in claim 6 where additional toxins are printed on the substrate and bound to indicators to form a bar code.

10. A food contamination detector as recited in claim 6 wherein the indicator comprises an antibody bound to a latex bead.

11. A food contamination device as recited in claim 10 wherein the antibody is selected from the group consisting of monoclonal antibodies and polyclonal antibodies.

12. A food contamination detector for identifying the presence of toxins in food comprising:

a tray for holding a food product;

a collector in the tray for collecting liquids from the food product; and

a bar code detector located in the collector wherein the bar code detector comprises;

a toxin printed on a substrate in a bar code pattern; and

an indicator bound to the toxin to make the bar code pattern visible.

13. A food contamination detector as recited in claim 12 wherein the toxins are selected from the group consisting of Salmonella sp., Listeria Sp., E. coli, ciguatoxin and related marine polyethers, domoic acid and aflatoxin.

14. A food contamination detector as recited in claim 12 wherein the substrate comprises a transparent membrane.

15. A method of detecting contaminants in food comprising:

printing toxins onto a substrate;

binding an indicator to the toxins to form a bar code detectable by an optical scanner;

contacting the bar code with material derived from the food which is suspected of being contaminated with a toxin; and

scanning the bar code to thereby detect the presence of contaminants in the food.

16. A method as recited in claim 15 wherein the toxins are selected from the group consisting of Salmonella sp., Listeria Sp., E. coli, ciguatoxin and related marine polyethers, domoic acid and aflatoxin.

17. A method as recited in claim 15 wherein the substrate comprises a transparent membrane.

18. A method as recited in claim 15 wherein the indicator comprises an antibody bound to a latex bead.

19. A method as recited in claim 18 wherein the antibody is selected from the group consisting of monoclonal antibodies and polyclonal antibodies.