Methods and test devices for determination of glycated haemoglobin
First Claim
1. An analytical test element for determining the ratio of glycated to non-glycated haemoglobin in a sample, the test element comprising:
- a sample application zone;
a reagent zone in which non-immobilized signal-generating molecules are present in excess relative to an expected amount of glycated haemoglobin in the sample or which contains one or more haemolysis reagents to release cell-bound haemoglobin or both a fraction of the non-immobilized signal-generating molecules dissolve into the sample and bind to the glycated haemoglobin in the sample;
a separation zone for separating signal-generating molecules that are dissolved in the sample but not bound to glycated haemoglobin from the sample which contains signal-generating molecules bound to glycated haemoglobin and non-glycated haemoglobin; and
a detection zone for detecting the amount of non-glycated haemoglobin and for detecting the amount of signal-generating molecules bound to glycated haemoglobin, wherein one or more of the zones are located on or in at least one porous matrix material and are in contact with one another enabling liquid transfer or can be brought into such contact enabling liquid transfer from one another.
1 Assignment
0 Petitions
Accused Products
Abstract
This invention relates to a test element and a method for determining the ratio of glycated to non-glycated haemoglobin in a sample, for example, in a blood sample that is provided as a fresh sample, a dried sample or a haemolysed sample. The test element can include different zones for receiving the sample, serving as a depot for reagents such as non-immobilized signal-generating molecules or haemolysis reagents, separating reagents from the sample, and detecting heamoglobin. The zones are provided on a porous matrix and in fluid contact with each other. The method uses the test element and determines the ratio of glycated to non-glycated haemoglobin in a sample, by contacting the sample with an excess of signal generating molecules to bind to the glycated haemoglobin. The non-bound signal generating molecules are separated from the sample, and the amount or concentration of haemoglobin and/or glycated haemoglobin bound signal generating molecules are determined. The signal generating molecules can be selected to be a direct label, an enzyme label or a radiolabel, which can be attached to the glycated haemoglobin via a boronic acid group or another specific binding partner or antibody.
-
Citations
15 Claims
-
1. An analytical test element for determining the ratio of glycated to non-glycated haemoglobin in a sample, the test element comprising:
-
a sample application zone;
a reagent zone in which non-immobilized signal-generating molecules are present in excess relative to an expected amount of glycated haemoglobin in the sample or which contains one or more haemolysis reagents to release cell-bound haemoglobin or both a fraction of the non-immobilized signal-generating molecules dissolve into the sample and bind to the glycated haemoglobin in the sample;
a separation zone for separating signal-generating molecules that are dissolved in the sample but not bound to glycated haemoglobin from the sample which contains signal-generating molecules bound to glycated haemoglobin and non-glycated haemoglobin; and
a detection zone for detecting the amount of non-glycated haemoglobin and for detecting the amount of signal-generating molecules bound to glycated haemoglobin, wherein one or more of the zones are located on or in at least one porous matrix material and are in contact with one another enabling liquid transfer or can be brought into such contact enabling liquid transfer from one another. - View Dependent Claims (2, 3, 4, 5)
-
-
6. An analytical test element comprising:
-
a sample application zone for receiving a sample comprising haemoglobin and glycated haemoglobin;
a reagent zone for contacting the sample with a reagent comprising non-immobilized signal-generating molecules or haemolysis reagents or both, said non-immobilized signal generating molecules provided in an excess amount sufficient to convert substantially all of the glycated haemoglobin in the sample to a detectable complex comprising signal generating molecules bound to glycated haemoglobin;
a separation zone comprising a porous matrix material including positively charged groups provided to retain any non-immoblized signal generating molecules in the sample; and
a detection zone for detecting the amount of detectable complex or a total amount of haemoglobin or both in the sample, wherein one or more of the zones are located on or in at least one porous matrix material and are in contact with one another or can be brought into contact with one another to allow liquid transfer through the zones. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
-
Specification