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US5294336A
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Apparatus for liquid chromatography for separating AIC components from hemoglobin in blood
Assignee: Hitachi Ltd
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Filing: 1992-06-09
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Granted: 1994-03-15
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Expires: 2012-06-09
Abstract
Abstract Stable hemoglobin Alc (s-Alc) can be separated from other hemoglobin components and quantitated in a short time by means of a liquid-chromatographic apparatus comprising a separation column packed with a packing material consisting essentially of a porous substance having a carboxyalkyl group combined thereinto, as ion exchanger, a means for injecting a sample into the separation column, a means for passing one or more eluents through the separation column, and a means for detecting hemoglobin, hemoglobin derivatives or glycosylated hemoglobin, the average particle size of the packing material in dry state being 4 (my)m or less.
Inventors
- 👤 Masako Mizuno
- 👤 Kenji Tochigi
- 👤 Yutaka Misawa
- 👤 Hiroyuki Miyagi
- 👤 Yoshio Watanabe
- 👤 Taro Nogami
- 👤 Junkichi Miura
- 👤 Yoshinori Takata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:56
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/72; G01N33/721; G01N33/723; B; B01; B01D; B01D15/00; B01D15/08; G01N30/00; G01N30/02; G01N2030/022; G01N2030/027
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
134 words
An apparatus for liquid chromatography for measuring hemoglobin, hemoglobins derivatives or glycosylated hemoglobin in blood, which comprises: a separation column packed with packing material obtained by introducing a carboxyalkyl group into an inorganic porous substance or an organic porous substance; a means for injecting a sample into the separation column; a means for passing one or more eluents through the separation column for separating labile-A lc and stable A lc from hemoglobin in blood; and a means for detecting the absorbances of eluates from the separation column, the average particle size of said packing material in dry state being 4 μm or less, and said packing material having a specific surface area in dry state of 10 to 100 m 2 /g and an exchange capacity per gram on dry basis of 0.1-1 meq.
Claim 2
Independent Claim
134 words
An apparatus for liquid chromatography for measuring hemoglobin, hemoglobins derivatives or glycosylated hemoglobin in blood, which comprises: a separation column packed with packing material obtained by introducing a carboxyalkyl group into an inorganic porous substance or an organic porous substance; a means for injecting a sample into the separation column; a means for passing one or more eluents through the separation column for separating labile-A lc and stable A lc from hemoglobin in blood; and a means for detecting the absorbances of eluates from the separation column, the average particle size of said packing material in dry state being 4 μm or less, and said packing material having a specific surface area in dry state of 10 to 100 m 2 /g and an exchange capacity per gram on dry basis of 0.1-1 meq.
Claim 3
Dependent Claim
17 words
An apparatus for liquid chromatography according to claim 1, wherein the carboxyalkyl group is a carboxymethyl group.
Claim 4
Independent Claim
22 words
An apparatus for liquid chromatography according to claims 1, wherein the eluent(s) are buffer solution(s) having a pH of 5.0 to 7.0.
Claim 5
Independent Claim
147 words
A system for liquid chromatography for determining hemoglobin, hemoglobin derivatives or glycosylated hemoglobin in blood, which comprises: one or ore eluents for separating labile-A lc and stable-A lc and for separating A lc components from hemoglobins in blood; a separation column; a means for detecting components separated in the separation column; a calculation means for calculating the proportions of the components; a processing means for processing data from the calculation means, to judge whether the proportion of A lc exceeds a predetermined value; a means for varying the flow rate, switching times, compositions or mixing rate of the one or more eluents flowing into the separation column, on the basis of signal(s) from the processing means, thereby allowing separation of A lc component from hemoglobins in blood and separation of labile-A lc and stable-A lc from hemoglobins in blood to be continuously effected in said separation column.
Claim 6
Independent Claim
147 words
A system for liquid chromatography for determining hemoglobin, hemoglobin derivatives or glycosylated hemoglobin in blood, which comprises: one or ore eluents for separating labile-A lc and stable-A lc and for separating A lc components from hemoglobins in blood; a separation column; a means for detecting components separated in the separation column; a calculation means for calculating the proportions of the components; a processing means for processing data from the calculation means, to judge whether the proportion of A lc exceeds a predetermined value; a means for varying the flow rate, switching times, compositions or mixing rate of the one or more eluents flowing into the separation column, on the basis of signal(s) from the processing means, thereby allowing separation of A lc component from hemoglobins in blood and separation of labile-A lc and stable-A lc from hemoglobins in blood to be continuously effected in said separation column.
Claim 7
Dependent Claim
82 words
A system for liquid chromatography according to claim 4, wherein the separation column is packed with a packing material obtained by introducing a functional group into an inorganic or organic porous substance, the average particle size of the packing material in dry state being 4 μm or less, the specific surface area of the packing material in a dry state being 10 to 100 m 2 /g, and the exchange capacity per gram on a dry basis being 0.1 to 1 meq.
Claim 8
Dependent Claim
17 words
A system for liquid chromatography according to claim 5, wherein said functional group is a carboxyalkyl group.
Claim 9
Dependent Claim
17 words
A system for liquid chromatography according to claim 6, wherein said carboxyalkyl group is a carboxymethyl group.
Claim 10
Independent Claim
112 words
An apparatus for liquid chromatography for fractionating hemoglobin into a plurality of fractions by flowing stepwise two or more eluents into a separation column, comprising a separation column, means for calculating proportions of components separated by said separation column, processing means for processing data from the calculation means and means for varying the mixing ratio, switching times or flow rate of two or more eluents on the basis of signals from the processing means to enable the determination of the proportion of A lc components and the determination of the proportions of labile-A lc and stable-A lc in the same said separation column by using the same said two or more eluents.
Claim 11
Independent Claim
112 words
An apparatus for liquid chromatography for fractionating hemoglobin into a plurality of fractions by flowing stepwise two or more eluents into a separation column, comprising a separation column, means for calculating proportions of components separated by said separation column, processing means for processing data from the calculation means and means for varying the mixing ratio, switching times or flow rate of two or more eluents on the basis of signals from the processing means to enable the determination of the proportion of A lc components and the determination of the proportions of labile-A lc and stable-A lc in the same said separation column by using the same said two or more eluents.
Claim 12
Dependent Claim
85 words
An apparatus according to claim 8, wherein said separation column is packed with a packing material obtained by introducing a carboxyalkyl group into an inorganic porous substance or an organic porous substance, the average particle size of the packing material in dry state being 4 μm or less the specific surface area of the packing material in dry state being 10 to 100 m 2 /g, and the exchange capacity of the packing material per gram on a dry basis being 0.1 to 1 meq.
Claim 13
Dependent Claim
14 words
An apparatus according to claim 9, wherein said carboxyalkyl group is a carboxymethyl group.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-14 | 1997-09-13 | 1998-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-14 | 2001-09-13 | 2002-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-14 | 2005-09-13 | 2006-03-15 | $7700.00 | Window Closed / Lapsed |