Method of sample analysis
First Claim
1. A method for measuring a constituent of interest of a biological fluid or the like comprising the steps ofproviding a reaction chamber that contains an immobilized enzyme capable of modifying a constituent of interest,providing a measuring system,placing a first portion of a biological fluid to be analyzed in said reaction chamber and concurrently exposing a second unmodified portion of said biological fluid to said measuring system to provide a first data output,oscillating said first biological fluid portion with bidirectional flow in said reaction chamber to facilitate modification by said immobilized enzyme of said constituent of interest in said biological fluid,then exposing said first portion of said biological fluid to be analyzed to said measuring system to provide a second data output, andmodifying said second data output as a function of said first data output to provide an indication of the actual amount of said constituent of interest in said biological fluid.
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0 Petitions
Accused Products
Abstract
A system for analyzing a biological fluid or the like for a constituent of interest comprises structure defining a sample inlet port, structure defining an analysis region, a measuring system connected in sensing relation to the analysis region, and structure defining a reaction chamber that has an immobilized enzyme capable of modifying the constituent of interest. Control means operates liquid flow means in a unidirectional sample flow mode to initially flow a sample of material to be analyzed from the sample inlet port to the reaction chamber and to the analysis region for a measurement of unmodified sample material, and then operates the liquid flow means in a bidirectional sample flow mode to oscillate the sample material in the reaction chamber and facilitate modification by the immobilized enzyme of the constituent of material in the sample. Modified sample material is then introduced into the analysis region and the measuring system is operated to obtain a measurement of modified sample material, the measurements of modified and unmodified sample material then being used to provide an indication of the amount of the constituent of interest in the sample material.
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Citations
15 Claims
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1. A method for measuring a constituent of interest of a biological fluid or the like comprising the steps of
providing a reaction chamber that contains an immobilized enzyme capable of modifying a constituent of interest, providing a measuring system, placing a first portion of a biological fluid to be analyzed in said reaction chamber and concurrently exposing a second unmodified portion of said biological fluid to said measuring system to provide a first data output, oscillating said first biological fluid portion with bidirectional flow in said reaction chamber to facilitate modification by said immobilized enzyme of said constituent of interest in said biological fluid, then exposing said first portion of said biological fluid to be analyzed to said measuring system to provide a second data output, and modifying said second data output as a function of said first data output to provide an indication of the actual amount of said constituent of interest in said biological fluid.
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5. A method of measuring a substance capable of being enzymatically converted to a detectable ion with compensation for potassium ion interference comprising the steps of
placing a sample containing a substance capable of being enzymatically converted to a detectable ion in a chamber comprising an immobilized enzyme capable of converting said substance to said detectable ion and detecting means for detecting said detectable ion; -
contacting said sample with said detecting means before said immobilized enzyme has converted said substance to said detectable ion and measuring the output of said detecting means to provide a potassium ion interference (pre-enzymatic reaction) output; oscillating said sample in said chamber in a bidirectional flow mode interval to facilitate conversion by said immobilized enzyme of said substance in said sample to said detectable ion; contacting said sample with said detecting means after said immobilized enzyme has converted said substance to said detectable ion and measuring the output of said detecting means to provide an apparent substance amount output; and modifying said post-enzymatic reaction output as a function of said pre-enzymatic reaction output to provide an indication of the actual amount of a substance in said sample using a form of the Nicolsky equation. - View Dependent Claims (6, 7)
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8. A method of measuring a substance capable of being enzymatically converted to a detectable ion with compensation for potassium ion interference comprising the steps of
placing a sample containing a substance capable of being enzymatically converted to a detectable ion in a chamber comprising an immobilized enzyme capable of converting said substance to said detectable ion and detecting means for detecting said detectable ion; -
contacting said sample with said detecting means before said immobilized enzyme has converted said substance to said detectable ion and measuring the output of said detecting means to provide a potassium ion interference (pre-enzymatic reaction) output; oscillating said sample in said chamber with bidirectional flow to facilitate conversion by said immobilized enzyme of said constituent of interest in said sample to said detectable ion; contacting said sample with said detecting means after said enzyme has converted said substance to said detectable ion and measuring the output of said detecting means to provide an apparent substance amount (post-enzymatic reaction) output; and modifying said post-enzymatic reaction output as a function of said pre-enzymatic reaction output to provide an indication of the actual amount of a substance in said sample. electrodes are spaced from one another by a flow path portion located so that said reference electrode is downstream of and spaced from said ion selective electrode by a flow path volume greater than the displacement volume that sample material is moved during said bidirectional sample flow mode interval. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification