Detection of contaminants in food

• US 6,270,724 B1
• Filed: 04/07/1999
• Issued: 08/07/2001
• Est. Priority Date: 01/11/1996
• Status: Expired due to Fees

• Current Assignee: SIRF Technology Incorporated (Qualcomm, Inc.)
• Original Assignee: CALIFORNIA SOUTH PACIFIC INVESTORS
• Inventors: Woodaman, James G.
• Primary Examiner(s): ALEXANDER, LYLE
• Application Number:
  US09/287,950
• Time in Patent Office: 853 Days
• Field of Search: 436/1, 436/164, 422/56, 422/58, 422/61, 426/87, 426/232, 116/100, 116/106
• US Class Current: 422/416
• CPC Class Codes: G01N 33/02 Food
• CPC Class Codes: G01N 33/12 Meat; Fish
• CPC Class Codes: G01N 33/569 for microorganisms, e.g. protozoa, bacteria, viruses
• CPC Class Codes: G01N 33/56911 Bacteria

Abstract

The present invention relates to a food contamination detector associated with a double bar code, given the trademark GILBAR™ by the owner of the present invention, that includes coded indicia used to identify the presence of conditions indicative of microbial contamination in food, including toxic contaminants, bacterial metabolites, and other microbial secretions. Of the two bar code symbols associated with the food contamination detector, the first identifies the food product in terms of the type of food, the quantity, the price and the like, while the second bar code symbol is designed to identify the presence of contaminants. When contamination is not detected, the first bar code symbol is scanner readable, whereas the second bar code symbol is not. Once contamination is detected, bars in both bar code symbols can appear or disappear causing the first bar code symbol to become scanner unreadable and the second bar code symbol to become scanner readable.

Claims

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

a first bar code symbol coded to identify a food product by a bar code reader;

a second bar code symbol coded to identify contaminated food by a bar code reader;

an indicator bound to a substrate wherein the indicator is in communication with the gases and vapors from the food; and

means for changing the appearance of the indicator when a condition indicative of contamination is present in the gases and vapors from the food, wherein the change in the appearance of the indicator causes the first bar code symbol to become unreadable by a bar code reader and causes the second bar code symbol to become readable by a bar code reader to identify food contamination.

2. A food contamination detector as recited in claim 1 wherein the means for changing identifies the presence of a condition indicative of contamination including bacterial metabolites and toxins.

3. A food contamination detector as recited in claim 1 wherein the indicator comprises an antibody attached to the substrate.

4. A food contamination detector as recited in claim 1 wherein the indicator comprises a time-temperature indicator associated with the substrate.

5. A food contamination detector for detecting the presence of bacterial metabolites comprising:

a tray for containing the food;

an indicator in communication with the gases and vapors from the food wherein the indicator comprises;

a first antibody attached to a substrate; and

a solution in contact with the first antibody attached to the substrate, wherein the solution contains a labeled second antibody and wherein the labeled second antibody becomes bound to the substrate changing the light reflectivity of the substrate in the presence of a bacterial metabolite in the gases and vapors from the food; and

a first bar code symbol coded to identify a food product aligned with the substrate so that the change in the light reflectivity of the substrate renders the first bar code symbol unreadable;

a second bar code symbol coded to identify contaminated food aligned with the substrate so that the change in the light reflectivity of the substrate renders the second bar code symbol readable to identify food contamination.

6. A food contamination detector as recited in claim 5 wherein the first antibody and the second antibody are each selected from the group consisting of monoclonal antibodies and polyclonal antibodies.