Method of measuring glycated hemoglobin concentration and concentration measuring apparatus

• US 8,268,625 B2
• Filed: 03/23/2007
• Issued: 09/18/2012
• Est. Priority Date: 03/24/2006
• Status: Active Grant

• Current Assignee: ARKRAY, Inc
• Original Assignee: ARKRAY, Inc
• Inventors: Sugiyama, Koji, Sakai, Toshikatsu
• Primary Examiner(s): Wallenhorst, Maureen
• Application Number:
  US12/225,540
• Publication Number:
  US 20100291691A1
• Time in Patent Office: 2,006 Days
• Field of Search: 436/63, 436/66, 436/67, 436/161, 436/164, 436/171, 422/70, 422/82.05, 422/82.09, 356/319, 356/320, 356/432, 356/433, 356/436
• US Class Current: 436/67
• CPC Class Codes: G01N 2030/8822 involving blood
• CPC Class Codes: G01N 21/31 Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry G01N21/72 takes precedence
• CPC Class Codes: G01N 30/74 Optical detectors measurement of intensity, velocity, spectral content, polarisation, or phase of infrared, visible or ultraviolet light G01J
• CPC Class Codes: G01N 30/8679 Target compound analysis, i.e. whereby a limited number of peaks is analysed
• CPC Class Codes: G01N 30/88 Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86

Abstract

When the concentration of glycated hemoglobin is measured, a plurality of wavelengths are selected as measurement wavelengths from the wavelength range of 400 to 450 nm. Preferably, by use of a liquid chromatography, at least the light of different peak wavelengths in the wavelength range of 415 to 430 nm are continuously or intermittently received to obtain a three dimensional chromatogram having as variables the wavelength, the elution time and the amount of detection. The concentration of glycated hemoglobin is calculated based on this three dimensional chromatogram.

Claims

1. A method of measuring a concentration of glycated hemoglobin in a sample, the method comprising:

eluting the sample;

irradiating the sample with light; and

measuring the concentration of glycated hemoglobin in the sample based on plurality of lights of measurement wavelength each having a peak wavelength in the wavelength range of 400 to 450 nm, the plurality of lights of measurement wavelength passing through and traveling from the sample to a light receiving section as a result of the sample being irradiated, wherein the concentration of the glycated hemoglobin is calculated based on a three dimensional chromatogram in which the measurement wavelength, an elution time of the sample, and an amount of light received in the light receiving section are made variables.

2. The method of measuring the concentration of glycated hemoglobin according to claim 1, wherein

the sample is produced by hemolyzing a blood cell.

3. The method of measuring the concentration of glycated hemoglobin according to claim 1, wherein the amount of light received by the light receiving section corresponds to an absorbance of light by the sample.

4. A method of measuring a concentration of glycated hemoglobin in a sample, the method comprising:

irradiating the sample with light; and

measuring the concentration of glycated hemoglobin in the sample based on a first quantity of light that is an amount of light that has a peak wavelength in the wavelength range of 400 to 420 nm and passes through and travels from the sample as a result of the sample being irradiated, and a second quantity of light that is an amount of light that has a peak wavelength in the wavelength range of 420 to 440 nm and passes through and travels from the sample as a result of the sample being irradiated, wherein

the concentration of glycated hemoglobin is obtained by calculating the concentration of oxyhemoglobin or a value that correlates to the concentration of oxyhemoglobin based on the first quantity of light, and by calculating the concentration of deoxyhemoglobin or a value that correlates to the concentration of deoxyhemoglobin based on the second quantity of light, and

by adding up the oxyhemoglobin concentration or the value that correlates to the oxyhemoglobin concentration and the deoxyhemoglobin concentration or the value that correlates to the deoxyhemoglobin concentration.

5. A method of measuring a concentration of glycated hemoglobin in a sample, the method comprising:

eluting the sample;

irradiating the sample with light; and

measuring the concentration of glycated hemoglobin in the sample based on a first quantity of light that is an amount of light that has a peak wavelength in the wavelength range of 400 to 420 nm and passes through and travels from the sample to a light receiving section as a result of the sample being irradiated, and a second quantity of light that is an amount of light that has a peak wavelength in the wavelength range of 420 to 440 nm and passes through and travels from the sample to the light receiving section as a result of the sample being irradiated, wherein

the concentration of glycated hemoglobin is calculated based on a chromatogram produced by overlapping a first chromatogram that corresponds to oxyhemoglobin indicating the relationship between an elution time of the sample and an amount of light received in the light receiving section based on the first quantity of light and a second chromatogram that corresponds to deoxyhemoglobin indicating the relationship between the elution time of the sample and an amount of light received in the light receiving section based on the second quantity of light.

6. An apparatus for measuring a concentration of glycated hemoglobin in a sample, the apparatus comprising:

an eluting mechanism for eluting the sample;

a photometry mechanism including a light source and a light receiving section, wherein the photometry mechanism irradiates the sample with light from the light source, the light receiving section receives light that passes through and travels from the sample as a result of the sample being irradiated, and the photometry mechanism is configured to pass a plurality of lights of measurement wavelength each having a peak wavelength in the wavelength range of 400 to 450 nm through the sample and to receive light in the light receiving section after passing through and traveling from the sample; and

a calculating section configured to calculate the glycated hemoglobin concentration in the sample based on a three dimensional chromatogram in which the measurement wavelength, an elution time of the sample, and an amount of light received by the light receiving section are made variables.

7. The apparatus for measuring the concentration of glycated hemoglobin according to claim 6, wherein

the sample is produced by hemolyzing a blood cell.

8. The apparatus for measuring the concentration of glycated hemoglobin according to claim 6, wherein the amount of light received by the light receiving section corresponds to an absorbance of light by the sample.

9. An apparatus for measuring a concentration of glycated hemoglobin in a sample, the apparatus comprising:

a photometry mechanism including a light source and a light receiving section, wherein the photometry mechanism irradiates the sample with light from the light source, the light receiving section receives light that passes through and travels from the sample as a result of the sample being irradiated, and the photometry mechanism is configured to pass a plurality of lights of measurement wavelength each having a peak wavelength in the wavelength range of 400 to 450 nm through the sample and to receive light in the light receiving section after passing through and traveling from the sample; and

a calculating section configured to calculate the glycated hemoglobin concentration in the sample based on a first quantity of light that is an amount of light having a peak wavelength in the wavelength range of 400 to 420 nm, passing through and traveling from the sample, and a second quantity of light that is an amount of light having a peak wavelength in the wavelength range of 420 to 440 nm, passing through and traveling from the sample,

wherein the calculating section is configured to calculate the concentration of oxyhemoglobin or a value that correlates to the concentration of oxyhemoglobin based on the first quantity of light on the one hand, and to calculate the concentration of deoxyhemoglobin or a value that correlates to the concentration of deoxyhemoglobin based on the second quantity of light on the other, and also to add up the oxyhemoglobin concentration or the value that correlates to the concentration of oxyhemoglobin and the deoxyhemoglobin concentration or the value that correlates to the concentration of deoxyhemoglobin to thereby calculate the concentration of glycated hemoglobin in the sample.

10. An apparatus for measuring a concentration of glycated hemoglobin in a sample, the apparatus comprising:

an eluting mechanism for eluting the sample;

a photometry mechanism including a light source and a light receiving section, wherein the photometry mechanism irradiates the sample with light from the light source, the light receiving section receives light that passes through and travels from the sample as a result of the sample being 2irradiated, and the photometry mechanism is configured to pass a plurality of lights of measurement wavelength each having a peak wavelength in the wavelength range of 400 to 450 nm through the sample and to receive light in the light receiving section after passing through and traveling from the sample; and

a calculating section configured to calculate the glycated hemoglobin concentration in the sample based on a first quantity of light that is an amount of light having a peak wavelength in the wavelength range of 400 to 420 nm, passing through and traveling from the sample, and a second quantity of light that is an amount of light having a peak wavelength in the wavelength range of 420 to 440 nm, passing through and traveling from the sample, wherein

the calculating section is further configured to calculate the concentration of glycated hemoglobin in the sample based on a chromatogram produced by overlapping a first chromatogram that corresponds to oxyhemoglobin indicating the relationship between an elution time of the sample and an amount of light received in the light receiving section based on the first quantity of light and a second chromatogram that corresponds to deoxyhemoglobin indicating the relationship between the elution time of the sample and an amount of light received in the light receiving section based on the second quantity of light.