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Cholesterol Sensor

a cholesterol sensor and sensor technology, applied in the field of cholesterol sensors, can solve the problems of undesirable time delay and adverse effects of higher concentrations of low density lipoproteins, and achieve the effect of rapid but detailed analysis of cholesterol levels of patients and fast test results

Inactive Publication Date: 2008-10-30
ROCHE DIABETES CARE INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a simple and electrochemical method for determining the total amount of cholesterol in a sample, as well as the amount of HDL and LDL cholesterol. The method requires no particular skill on the part of the user and can be carried out by untrained personnel. The test results are also provided quickly, typically within a matter of minutes. The invention also provides a kit for measuring the total cholesterol content of a sample, comprising electrochemical cells, reagents, and a power supply. The method and kit can provide a rapid and detailed analysis of a patient's cholesterol levels, which can be useful in point of care settings.

Problems solved by technology

Conversely, higher concentrations of low density lipoproteins (LDL) are considered to have an adverse effect.
This causes an undesirable time delay between test samples being taken from a patient and a diagnosis being reached.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0123]A device of the type depicted in FIG. 3, having four electrochemical cells as depicted in FIG. 2 wherein the base 1 is formed by a membrane (Pall Versapor) is used. The working electrode is a carbon electrode and the pseudo reference electrode is a Ag / AgCl electrode. The volume of each cell as defined by the walls, base, adhesive and bottom surface of the membrane 4 is approximately 0.8 μl. A reagent mixture is inserted into each cell and freeze dried, prior to attachment of a Whatman VF2 membrane over the device at 4.

[0124]The reagent mixtures used are as follows. Batches of reagent mixture are made up in advance using the proportions specified below.

[0125]Total cholesterol test (0.6 μl inserted into the electrochemical cell)

0.1 M TRIS buffer (pH9)

0.05 M Magnesium sulphate (MgSO4)

5% w / v Sigma CHAPS

[0126]5% Soltec Ventures deoxy bigCHAP

5% w / v glycine

1% w / v inositol

1% w / v ectoine

80 mM ruthenium (III) hexamine chloride (Ru(NH3)6Cl3)

8.8 mM thio-nicotinamide adenine dinucleotide (...

examples 2 to 13

Analysis Used for Examples 2 to 13

[0137]The output from General Purpose Electrochemical System (GPES) software (Eco Chemie) software was analysed using the concentrations of appropriate analyte, for example total cholesterol, triglycerides, dilipidated serum, obtained from a Space analyser. The precision (% CV) of the readings for each sample was calculated on the template using the formula:

%CV=100×StDevAverage

StDev is the standard deviation of the results from a given sample, and average is the mean value.

Total Cholesterol Test

example 2

Freeze Dried Sensors Prepared with Various Surfactants

[0138]Several experiments were performed using the same basic enzyme mix, with a number of different surfactants. The basic enzyme mix dispensing mixture was prepared as followed. Tris buffer containing MgSO4, glycine, myo-inositol, ectoine was used to make solutions containing Ru(NH3)6Cl3 and thio-nicotinamide adenine dinucleotide (TNAD), putidaredoxin reductase (PdR), cholesterol esterase (ChE), surfactant which were subsequently used to make a single solution containing cholesterol dehydrogenase (ChDH).

[0139]Approximate concentrations in final mix:

0.1 M Tris buffer (pH 9.0)

50 mM MgSO4

[0140]5% w / v glycine

1% w / v myo-inositol

1% w / v ectoine

Varying % surfactant (see below)

80 mM Ru(NH3)6Cl3 (in the case of 7.5% DBC the Ruthenium concentration was 40 mM)

8.8 mM TNAD

[0141]4.2 mg / ml PdR

3.3 mg / ml ChE

100 mg / ml ChDH

[0142]Concentrations of surfactants tested in final dispensed mixture:

No surfactant

5% CHAPS

5% CHAPSO

[0143]5% glucodeoxycholic...

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Abstract

A method for the determination of the amount of cholesterol in a sample is provided. The method typically provides a breakdown of the HDL and LDL cholesterol contents of the sample.

Description

FIELD OF THE INVENTION[0001]The present invention relates to methods for determining the amount of cholesterol in a sample. The invention also relates to reagent mixtures and a kit for use in such methods.BACKGROUND TO THE INVENTION[0002]In the current climate of increasing incidence of disorders related to high cholesterol, in particular coronary artery disease (CAD), there is an increasing demand for effective cholesterol testing. Many epidemiological investigations have demonstrated the strong and independent inverse association of high density lipoprotein (HDL), measured in terms of either its cholesterol or apo A1 content, to risk of CAD. It is said that the risk of CAD increases 2-3% for every 10 mg / L decrease in HDL-cholesterol. Thus, higher HDL-cholesterol concentrations are considered protective. Conversely, higher concentrations of low density lipoproteins (LDL) are considered to have an adverse effect. Therefore, cholesterol tests should preferably not only indicate the t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A01N1/02C12Q1/60
CPCC12Q1/005C12Q1/004
Inventor WALLACE-DAVIS, EMMA NAOMI KATHLEENMURPHY, LINDY JANEALLAN, ANDREW WILLIAM
Owner ROCHE DIABETES CARE INC
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