Method and product for decaffeinating an aqueous solution using molecularly imprinted polymers

• US 6,391,359 B2
• Filed: 10/01/2001
• Issued: 05/21/2002
• Est. Priority Date: 09/28/1999
• Status: Expired due to Term

• Current Assignee: The Decaf Company, LLC
• Original Assignee: Anna Madeleine Leone
• Inventors: Leone, Anna Madeleine
• Primary Examiner(s): Weier, Anthony J
• Application Number:
  US09/969,427
• Publication Number:
  US 20020012727A1
• Time in Patent Office: 232 Days
• Field of Search: 426/422, 426/597, 426/424, 426/435
• US Class Current: 426/422
• CPC Class Codes: A23F 3/385 using flocculating, precipitating, adsorbing or complex-forming agents, or ion-exchangers
• CPC Class Codes: A23F 5/223 using flocculating, precipitating, adsorbing or complex-forming agents, or ion-exchangers
• CPC Class Codes: B01J 20/268 Polymers created by use of a template, e.g. molecularly imprinted polymers

Abstract

A method and product for decaffeinating an aqueous solution, such as a cup of coffee or tea, includes exposing the aqueous solution (that is to be decaffeinated) to a plurality of molecularly imprinted polymer beads (MIPS) that have receptor sites on the surfaces thereof that include imprints that match the physical shape of at least a portion of a caffeine molecule. A quantity of the caffeine molecules align with and adhere to some of the receptor sites and, accordingly, they are removed from the aqueous solution producing a decaffeinated aqueous solution. The MIPS are contained in an enclosure having a plurality of openings large enough to permit the aqueous solution to pass through and small enough so as to prevent the MIPS from passing through. Accordingly, the MIPS are absent from the decaffeinated aqueous solution. A variety of ways of affecting the efficacy of the process are described, such as varying the time the aqueous solution is exposed to the MIPS or varying the quantity of MIPS (beads) that the aqueous solution is exposed to. Processes useful for creating the MIPS and of removing the caffeine molecules therefrom (i.e., cleaning the MIPS so that they are suitable to use in decaffeinating the aqueous solution) are described. The cleaning and subsequent reuse of the MIPS is also described.

Claims

1. A product for decaffeinating an aqueous extract, comprising:

(a) a plurality of molecularly imprinted polymer beads; and

(b) a plurality of imprints disposed on the surface of at least some of said molecularly imprinted polymer beads that correspond with at least a portion of the molecular shape of a caffeine molecule.

2. The product of claim 1 wherein said aqueous extract is a brewed cup of coffee.

3. The product of claim 1 wherein said aqueous extract is a brewed cup of a tea.

4. The product of claim 1 wherein said aqueous extract is derived from an organic substance.

5. The product of claim 1 wherein said aqueous extract is derived from a vegetable material.

6. The product of claim 1 including means for containing said plurality of molecularly imprinted polymer beads and wherein when said aqueous extract is exposed to said plurality of molecularly imprinted beads, at least some of said imprints are adapted to extract a caffeine molecule from said aqueous extract.

7. The product of claim 6 wherein said means for containing includes means for providing an enclosure that is adapted to contain said plurality of molecularly imprinted polymer beads.

8. The product of claim 7 wherein said means for providing an enclosure includes a plurality of openings, said plurality of openings generally being smaller than the diameter of said molecularly imprinted polymer beads.

9. The product of claim 7 wherein said means for providing an enclosure includes providing a plurality of openings in said enclosure, said plurality of openings generally being of a size sufficient to permit the passage of said aqueous extract through said enclosure.

10. The product of claim 7 wherein said means for providing an enclosure includes a plurality of openings formed in said enclosure, said openings generally being smaller than the diameter of said molecularly imprinted polymer beads and wherein said openings generally are of a size sufficient to permit the passage of said aqueous extract through said enclosure.