Cobalt(III) reagents in combination with water soluble polymers
First Claim
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1. A reagent composition for the detection of an analyte in an aqueous sample which comprises:
- (1) a water soluble cobalt(III) complex which is capable of being reduced to a water soluble cobalt(II) complex by said analyte and,(2) a water soluble dye which is capable of being metallized by said cobalt(II) complex to form a water soluble cobalt(II) complex of the metallizable dye, wherein said cobalt(II) complex of the metallizable dye is capable of reacting with said cobalt(III) complex to produce a cobalt(III) complex of the metallizable dye and the cobalt(II) complex; and
(3) a water soluble polymer.
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Abstract
Water soluble polymers are useful in combination with cobalt(III) redox reagents. When incorporated with the polymers, the cobalt(III) reagents exhibit improved sensitivity compared to fresh solutions of the reagents. In preferred embodiments, the cobalt(III) reagents are coated on a support using the water soluble polymer as a binder. Small areas of the coated support are then cut out and placed in a buffer solution to provide a working reagent solution. The solution is particularly useful in the testing of urine for significant bacteriuria.
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Citations
10 Claims
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1. A reagent composition for the detection of an analyte in an aqueous sample which comprises:
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(1) a water soluble cobalt(III) complex which is capable of being reduced to a water soluble cobalt(II) complex by said analyte and, (2) a water soluble dye which is capable of being metallized by said cobalt(II) complex to form a water soluble cobalt(II) complex of the metallizable dye, wherein said cobalt(II) complex of the metallizable dye is capable of reacting with said cobalt(III) complex to produce a cobalt(III) complex of the metallizable dye and the cobalt(II) complex; and (3) a water soluble polymer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for the determination of an analyte in a liquid comprising the steps of:
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(A) contacting a sample of said liquid with a reagent composition comprising; (1) a water soluble cobalt(III) complex which is capable of being reduced to a water soluble cobalt(II) complex by said analyte and, (2) a water soluble dye which is capable of being metallized by said cobalt(II) complex to form a water soluble cobalt(II) complex of the metallizable dye, wherein said cobalt(II) complex of the metallizable dye is capable of reacting with said cobalt(III) complex to produce a cobalt(III) complex of the metallizable dye and the cobalt(II) complex; and (3) a water soluble polymer so as to produce a detectable change in the presence of said analyte and (B) detecting said detectable change and relating said change to the amount of analyte in said liquid.
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Specification