Patent US4539180A successfully refreshed from Google Patents.
US4539180A
Expired / Lapsed
US
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Apparatus for quantitatively determining the level of hemoglobin in a biological sample
Assignee: University of Minnesota System
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Filing: 1983-03-31
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Granted: 1985-09-03
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Expires: 2003-03-31
Abstract
Abstract A method of quantitatively determining the level of hemoglobin in a biological material which includes the steps of preparing a test sample of the biological material, converting the heme portion of the hemoglobin in the test sample to porphyrin, assaying the fluorescence of the converted porphyrin and comparing the fluorescence of the converted porphyrin to a standard. The invention also relates to an apparatus for performing the above method and a sampler device for collecting and preparing a test sample of the biological material, wherein the apparatus includes at least two reaction chambers with one chamber containing oxalic acid and ferrous oxalate for converting the heme portion of hemoglobin in a test sample to porphyrin and the other chamber containing citric acid which is generally non-reactive with the heme portion of hemoglobin to function as a control blank for the hemoglobin determination.
Inventors
- 👤 Samuel Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:33
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/72; A; A61; A61B; A61B10/00; A61B10/0038
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
154 words
An apparatus for quantitatively determining the level of hemoglobin in a biological specimen comprising: a device for preparing first and second test samples of a biological specimen including means defining first and second reaction chambers, said first reaction chamber containing a first reaction mixture comprising oxalic acid and ferrous oxalate for converting the heme portion of hemoglobin in a first test sample to porphyrin and said second reaction chamber containing a second reaction mixture comprising citric acid which is generally non-reactive with the heme portion of hemoglobin in a second test sample; means for heating first and second test samples in respective first and second reaction chambers in the presence of the respective first and second reaction mixtures to a temperature and for a duration to convert the heme portion of hemoglobin in said first test sample to porphyrin; and means for determining any fluorescence of porphyrin in said first and second test samples.
Claim 2
Independent Claim
154 words
An apparatus for quantitatively determining the level of hemoglobin in a biological specimen comprising: a device for preparing first and second test samples of a biological specimen including means defining first and second reaction chambers, said first reaction chamber containing a first reaction mixture comprising oxalic acid and ferrous oxalate for converting the heme portion of hemoglobin in a first test sample to porphyrin and said second reaction chamber containing a second reaction mixture comprising citric acid which is generally non-reactive with the heme portion of hemoglobin in a second test sample; means for heating first and second test samples in respective first and second reaction chambers in the presence of the respective first and second reaction mixtures to a temperature and for a duration to convert the heme portion of hemoglobin in said first test sample to porphyrin; and means for determining any fluorescence of porphyrin in said first and second test samples.
Claim 3
Dependent Claim
149 words
A test sample collection and preparation kit for use in connection with a test for quantitatively determining the level of hemoglobin in feces, said kit comprising: sampler means for collecting a test sample of feces including an elongated sampler section having a plurality of peripheral grooves for collection of said test sample, said sampler constructed of a composition containing polyethylene glycol and being rigid at room temperatures and becoming a liquid upon heating to a temperature in excess of 100° C.; a structure having a plurality of reaction chambers; a first reaction mixture in at least one of said reaction chambers, said first reaction mixture comprising oxalic acid and ferrous oxalate and being effective to convert the heme portion of hemoglobin in a first test sample to porphyrin; and a second reaction mixture in at least a second of said reaction chambers, said second reaction mixture comprising citric acid.
Claim 4
Dependent Claim
149 words
A test sample collection and preparation kit for use in connection with a test for quantitatively determining the level of hemoglobin in feces, said kit comprising: sampler means for collecting a test sample of feces including an elongated sampler section having a plurality of peripheral grooves for collection of said test sample, said sampler constructed of a composition containing polyethylene glycol and being rigid at room temperatures and becoming a liquid upon heating to a temperature in excess of 100° C.; a structure having a plurality of reaction chambers; a first reaction mixture in at least one of said reaction chambers, said first reaction mixture comprising oxalic acid and ferrous oxalate and being effective to convert the heme portion of hemoglobin in a first test sample to porphyrin; and a second reaction mixture in at least a second of said reaction chambers, said second reaction mixture comprising citric acid.
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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) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |