Preparation of blood samples for detecting homocysteine and/or folate

a technology for detecting homocysteine and folate, which is applied in the field of preparation of blood samples for detecting homocysteine and/or folate, can solve the problems that the use of these reagents in standard blood-withdrawal vessels cannot be routinely performed in standard ward mode or by the general practitioner (gp), and cannot achieve any stabilization of homocystein

Inactive Publication Date: 2002-01-03
PROBST REINER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This complicated procedure cannot, however, be routinely performed in standard ward mode or by the General Practitioner (GP).
The use of these reagents in standard blood-withdrawal vessels, however, does not achieve any stabilization of the homocysteine concentration, since these enzyme inhibitors are not absorbed into the blood cells and consequently an intracellular inhibition of the enzyme that produces the homocysteine cannot be achieved (FIG. 1).

Method used

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  • Preparation of blood samples for detecting homocysteine and/or folate
  • Preparation of blood samples for detecting homocysteine and/or folate
  • Preparation of blood samples for detecting homocysteine and/or folate

Examples

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example 1

[0031] An EDTA Monovette.RTM. (volume 2.7 ml, EDTA=approx. 1 mg / ml blood), Sarstedt company, is filled with 25 .mu.l Nonidet P40 (undiluted), 50 .mu.l EDTA (c=70 g / l, 1.3 mg / ml blood) and 25 .mu.l citric acid (c=0.6 g / ml, 5.6 mg / ml blood). 2.7 ml whole blood is added to this Monovette and shaken. The container is then left to stand at room temperature and the homocysteine concentration is detected at intervals (Oh, 24h, 48h) by HPLC. It is evident from FIG. 2 that the homocysteine concentration virtually does not vary over time. This stipulation represents currently the best implementation of the invention.

[0032] By way of comparison, EDTA and NaF Monovettes.RTM. (volume 2.7 ml) were filled with 2.7 ml whole blood and left to stand for several hours at room temperature. FIG. 1 shows that the homocysteine concentration in the whole blood significantly increases without the stabilization technique according to the invention.

example 2

[0033] Based on an EDTA Monovette.RTM. prepared in accordance with the invention and listed in Example 1, the total folate concentration is detected using an "Access Immuno-Assay System" manufactured by Sanofi Diagnostics Pasteur. The resultant values are compared with the total folate concentrations of blood samples prepared by subsequent lysis of EDTA blood in the laboratory using a charged lysis reagent from the aforementioned company. Table 1 below shows the good correlation of the folate concentrations.

1 TABLE 1 Folate concentration Folate concentration in the in the lysate subsequently lysed EDTA blood [ng / ml] [ng / ml] Blood-withdrawal system Routine detection as prescribed according to the invention in the access assay 54 55 79 83 131 137 260 283

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Abstract

The invention relates to a method and blood-withdrawal vessel for preparing blood samples for detecting homocysteine and / or total folate and is characterized in that the blood sample is brought into contact with (a) at least one reagent for lysis of the blood cells, (b) at least one inhibitor of the enzymes which produce and break down homocysteine, and optionally, (c) at least one acid.

Description

[0001] The present invention relates to a method and a blood-withdrawal vessel for preparing blood samples for detecting homocysteine and / or total folate. In particular, "preparation" is defined here as the stabilization of blood samples for the detection of homocysteine and the lysis of the erythrocytes in order to prepare the detection of total folate. In conjunction with this invention, "total folate" is defined as the sum of erythrocytic and plasma folate.PRIOR ART[0002] Homocysteine, a sulfur-containing amino acid, occurs in the organism only as an intermediate product in the methionine / cysteine / gluta-thione metabolic circulation and is not incorporated into proteins. Various hereditary defects of the key enzymes cystathionine-.beta.-synthe-tase and methylene-tetrahydrofolate-reductase (MTHFR) or a deficiency of corresponding vitamin cofactors (B.sub.12, B.sub.6, folate) cause homocysteine to be insufficiently broken down and therefore it arises in increased concentrations in t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01N33/68G01N33/82
CPCG01N33/6815G01N33/82Y10T436/2525Y10T436/25Y10T436/107497
Inventor PROBST, REINERBLUMKE, MATTHIAS
Owner PROBST REINER
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