Method and apparatus for analyzing acetone in breath
First Claim
1. A method for sensing acetone in breath, the method comprising:
- providing a cartridge comprising;
a reactant in a reaction zone, wherein the reactant comprises an amine disposed on a solid surface, anda nitroprusside in a reaction zone, the nitroprusside disposed on a solid surface,wherein the reaction zone has an optical characteristic that is at a reference level;
causing a breath sample to be passed through the cartridge such that the acetone in the breath sample reacts with the reactant to form a reaction product, wherein the reaction product is configured to react with the nitroprusside,resulting in a change in the optical characteristic of the reaction zone relative to the reference level; and
measuring the change in the optical characteristic of the reaction zone, said change reflective of a concentration of acetone in the breath sample.
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Abstract
Methods and devices are provided for analyzing acetone in breath. One such method comprises disposing a reactant in a reaction zone within the breath analysis device, wherein the reactant comprises a primary amine disposed on a surface, and wherein the reaction zone has an optical characteristic that is at a reference level. It also comprises pre-storing a liquid nitroprusside solution within the breath analysis device separately from the reactant. The method further comprises using the breath analysis device to cause the breath to contact the reactant in the reaction zone so that the acetone in the breath reacts with the reactant to form a reaction product and, after the reaction product has been formed, using the breath analysis device to cause the nitroprusside solution to contact and react with the reaction product and to facilitate a change in the optical characteristic of the reaction zone relative to the reference level. The method also comprises using the breath analysis device to detect the change in the optical characteristic to sense the acetone in the breath. Apparatuses that use these methods are also described.
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Citations
27 Claims
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1. A method for sensing acetone in breath, the method comprising:
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providing a cartridge comprising; a reactant in a reaction zone, wherein the reactant comprises an amine disposed on a solid surface, and a nitroprusside in a reaction zone, the nitroprusside disposed on a solid surface, wherein the reaction zone has an optical characteristic that is at a reference level; causing a breath sample to be passed through the cartridge such that the acetone in the breath sample reacts with the reactant to form a reaction product, wherein the reaction product is configured to react with the nitroprusside, resulting in a change in the optical characteristic of the reaction zone relative to the reference level; and measuring the change in the optical characteristic of the reaction zone, said change reflective of a concentration of acetone in the breath sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A breath analysis system, comprising:
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a cartridge having a reaction zone containing a reactant, the reaction zone forming part of a flow path through the cartridge, the reactant comprising an amine disposed on a solid surface, the reaction zone further comprising a nitroprusside disposed on a solid surface, the reaction zone having an optical characteristic that is at a reference level, wherein the cartridge is configured such that, when a breath sample is passed along the flow path, acetone in the breath sample reacts with the reactant to form a reaction product, the reaction product configured to react with the nitroprusside resulting in a change in the optical characteristic of the reaction zone relative to the reference level; and an optical sensor positioned to measure the change in the optical characteristic of the reaction zone, said change reflective of a concentration level of acetone in the breath sample. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification