Composition and method for ethanol determination

• US 4,642,286 A
• Filed: 05/07/1984
• Issued: 02/10/1987
• Est. Priority Date: 05/07/1984
• Status: Expired due to Fees

• Current Assignee: Mervin J. Moldowan
• Original Assignee: Mervin J. Moldowan
• Inventors: Moldowan, Mervin J.
• Primary Examiner(s): Kepplinger, Esther M.
• Application Number:
  US06/607,827
• Time in Patent Office: 1,009 Days
• Field of Search: 435/25, 435/28, 435/188, 435/805, 435/810, 435/184
• US Class Current: 435/25
• CPC Class Codes: C12Q 1/26 involving oxidoreductase
• CPC Class Codes: G01N 33/98 involving alcohol, e.g. ethanol in breath

Abstract

A novel composition and method is disclosed for detecting or quantitatively determining the level of ethanol. This is a colorimetric method and analysis can be done by the visual method. The composition comprises an enzyme alcohol oxidase, a peroxide detecting system consisting of peroxidase and chemicals and chemicals to stabilize alcohol oxidase.

Claims

1. A method for determining the level of ethanol in a fluid or air comprising exposing absorbent material to said fluid or air, the absorbent material being impregnated with a composition comprising:

(a) An indicator solution comprising orthotolidine, a yellow dye, ethanol and tris(hydroxymethy)-aminomethane/sodium phosphate buffer solution and

(b) an enzyme solution comprising dextran, sodium chloride, peroxidase, alcohol oxidase, semicarbazide hydrochloride and a tris(hydroxymethyl)-aminomethane/sodium phosphate buffer solution said dextran and sodium chloride being present in amounts sufficient to stabilize the alcohol oxidase and the semicarbazide hydrchloride being present in an amount sufficient to inhibit said alcohol oxidase.

2. The method of claim 1 wherein the indicator solution comprises:

Ortho-tolidine;

0.002% to 20% by weight

dye;

0.001% to 50% by weight

ethanol;

0.5% to 95% by weight

buffer solution (pH 5 to

     10);

0.01% to 70% by weight

and the enzyme solution comprises;

dextran;

0.02% to 50% by weight

sodium chloride;

0.02% to 20% by weight

peroxidase (95 units/mg);

0.001% to 20% to weight

alcohol oxidase (35 units/mg)*;

0.001% to 40% by weight

semicarbazide hydrochloride;

0.02% to 3% by weight

buffer solution (pH 5 to

     10);

0.01% to 75% by weight

3. The method of claim 1 wherein said indicator solution comprises 0.1 g ortho-tolidine, 0.042 g FDC yellow No. 5 dye, 2 ml ethanol (95% v/v) and 23 ml buffer solution of pH 8.0 and said enzyme solution comprises 232 units peroxidase, 140 units alcohol oxidase, 0.15 g dextran, 0.018 g sodium chloride, 0.0123 g semicarbazide hydrochloride in a total volume of 2 ml buffer solution at pH 8.0.

4. The method of claim 3 wherein dextran has a molecular weight of 40,000.

5. A composition of making ethanol detection strips comprising dextran, sodium chloride, peroxidase, alcohol oxidase, semicarbazide, a buffer solution and a hydrogen peroxide detecting reagent said dextran and sodium chloride being present in amounts sufficient to stabilize the alcohol oxidase and the semicarbazide hydrochloride being present in an amount sufficient to inhibit said alcohol oxidase.

6. The composition of claim 5 wherein the components are present in the indicated amounts:

dextran;

0.02% to 50% by weight

sodium chloride;

0.02% to 20% by weight

peroxidase (95 units/mg);

0.001% to 20% by weight

alcohol oxidase (35 units/mg)*;

0.0001% to 40% by weight

semicarbazide hydrochloride;

0.02% to 3% by weight

buffer solution (pH 5 to

     10);

0.01% to 75% by weight

7. The composition of claim 5 comprising 232 units peroxidase, 140 units alcohol oxidase, 0.15 g dextran, 0.018 g sodium chloride, 0.0123 g semicarbazide hydrochloride in a total volume of 2 ml buffer solution at pH 8.0.

8. A composition of claim 7 wherein said dextran has a molecular weight of 40,000.