Automated fingerprint methods and chemistry for product authentication and monitoring

• US 6,232,124 B1
• Filed: 11/13/1998
• Issued: 05/15/2001
• Est. Priority Date: 05/06/1996
• Status: Expired due to Term

• Current Assignee: Verification Technologies, Inc. (Sun Chemical, Inc.)
• Original Assignee: Verification Technologies, Inc. (Sun Chemical, Inc.)
• Inventors: Selinfreund, Richard H.
• Primary Examiner(s): SNAY, JEFFREY R
• Application Number:
  US09/191,947
• Time in Patent Office: 914 Days
• Field of Search: 436/56, 436/20, 436/24, 436/22, 436/23, 436/2, 436/172
• US Class Current: 436/20
• CPC Class Codes: G01N 2021/6417 Spectrofluorimetric devices
• CPC Class Codes: G01N 21/6428 Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes" in vivo A61B5/00; immunoassay G01N33/53
• CPC Class Codes: G01N 21/643 non-biological material
• CPC Class Codes: G01N 2201/129 Using chemometrical methods

Abstract

Highly efficient, low cost, methods and compounds to determine product authenticity, tampering, manufacturing compliance are provided. The methods and chemicals defined are capable of measuring the relative amounts of key materials in these products. The compounds are light emitting and interact with key elements in products like, neutral spirits, vodka, tequila, soft drinks and infant formulas. After the interactions are complete, methods are employed to determine resulting key components by light emission.

Claims

1. A method for determining relatedness of a sample to a standard known to be authentic or known to have at least one selected characteristic of authentic material, the method comprising:

a. providing a sample product which is free of any exogenous product tag;

b. providing a test sample comprising the sample product and at least one light-emissive compound;

c. irradiating the test sample with an irradiating wavelength of light;

d. monitoring at least one emitted wavelength of light, generated in response to the irradiating wavelength of light, to establish a sample emission profile;

e. providing a standard fingerprint characteristic of a standard, the standard comprising the standard and the light-emissive compound and the standard fingerprint being generated by irradiating several of the standard with the irradiating wavelength and monitoring the emitted wavelength in response thereto; and

f. comparing the sample emission profile with the standard fingerprint to determine whether the sample is authentic.

2. The method of claim 1 further comprising:

providing a background control which comprises the light-emissive compound without the sample or the standard;

irradiating the background control with the irradiating wavelength and monitoring the emitted wavelength in response thereto, to establish background emission; and

determining the emission profile of the sample based on at least one difference between the emission of the control and the emission of the test sample.

3. The method of claim 1 in which the light-emissive compound is added to the sample by an automated pipette.

4. The method of claim 1, wherein the sample mixture is dispensed by an automated pipette in a multiwell plate.

5. The method of claim 1, wherein the standard, the sample, or both inherently include a fluorescent, phosphorescent, or luminescent compound.

6. The method of claim 5 in wherein the compound is caffeine.

7. The method of claim 1, wherein the light-emissive compound is fluorescent, phosphorescent, or luminescent.

8. The method of claim 1 in which the light-emissive compound reacts with components of the sample or the standard or both to yield at least one fluorescent, phosphorescent, or luminescent component.

9. A method for determining whether a product is authentic, comprising:

obtaining a liquid sample of a product which is free of any exogenous product tag, and then combining with the liquid sample a light emissive compound which interacts with an analyte of the product to form a test sample,

irradiating the test sample,

determining the intensity of light emitted from the test sample at a wave length, and

comparing the intensity of light emitted from the test sample to the intensity of light emitted as a result of irradiating a mixture of the light emissive compound and an authentic liquid standard of the product, wherein similarity of light emission intensity is determinative of authenticity of the sample and dissimilarity of light emission intensity is determinative of nonauthenticity of the sample.

10. The method of claim 9, wherein the chemical composition of the product is unknown.

11. The method of claim 9, wherein the chemical structure of the analyte to which the light emissive compound binds is assumed.

12. The method of claim 9, wherein the product is a liquid consumable product.

13. The method of claim 9, wherein said light emissive compound is a plurality of light emissive compounds and said analyte is a plurality of analytes, each light emissive compound binding to a different of said analytes.

14. The method of claim 9, wherein said light emissive compound is a plurality of light emissive compounds, wherein said plurality of light emissive compounds is between 3 and 7 compounds.

15. The method of claim 9, wherein the intensity of light emitted from the test sample is compared to the intensity of light emitted from a plurality of said mixture, and wherein authenticity requires the intensity of light emitted from the test sample to be within a pre-selected confidence limit defining a range of intensity calculated from the intensity of light emitted from the plurality of said mixture.

16. The method of claim 9, wherein said comparing the intensity of light is computer-implemented.