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Caffeine detector

  • US 6,461,873 B1
  • Filed: 03/17/2000
  • Issued: 10/08/2002
  • Est. Priority Date: 03/18/1999
  • Status: Expired due to Fees
First Claim
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1. A caffeine detector for detecting the presence and concentration of caffeine in a liquid, the detector comprising an elongated strip of absorbent paper having:

  • a) a first zone having a stationary phase disposed thereon including a first molecular imprint polymer for selectively absorbing compounds interfering with the detection of caffeine; and

    b) a second zone having a stationary phase disposed thereon including a second molecular imprint polymer for selectively absorbing caffeine and at least one chromogenic agent which produces a color change in the presence of caffeine; and

    c) said paper strip being suspended above a predetermined volume of a liquid with a portion of the first zone dipping into the liquid, the presence and concentration of caffeine in the liquid is determined by the height of the color change produced in the second zone.

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