Method for determining the glucose concentration by fluorescence polarization

• US 7,439,080 B2
• Filed: 03/23/2006
• Issued: 10/21/2008
• Est. Priority Date: 03/23/2005
• Status: Expired due to Fees

• Current Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Original Assignee: Roche Diagnostics Operations Incorporated (Roche Holding AG)
• Inventors: von der Eltz, Herbert, Hoenes, Joachim
• Primary Examiner(s): Weber; Jon P
• Assistant Examiner(s): Martin; Paul C.
• Application Number:
  US11/277,313
• Publication Number:
  US 20060216773A1
• Time in Patent Office: 943 Days
• Field of Search: None
• US Class Current: 436/529
• CPC Class Codes: G01N 2333/4724 Lectins
• CPC Class Codes: G01N 33/542 with steric inhibition or signal modification, e.g. fluorescent quenching
• CPC Class Codes: G01N 33/582 with fluorescent label
• CPC Class Codes: G01N 33/66 involving blood sugars, e.g. galactose

Abstract

The invention generally relates to a method for in vivo glucose monitoring in which the glucose concentration is measured by means of fluorescence polarization by detecting the change in viscosity, caused by changes in the glucose concentration.

Claims

1. A method for in vivo glucose monitoring in an individual, the method comprising:

filling a container that is permeable to glucose and having an inner space with a mixture containing a glucose-binding lectin and a probe;

sealing the container;

operatively coupling the container with a sensor, wherein the sensor is for measuring the fluorescence polarization;

implanting the container and the operatively coupled sensor into the individual; and

measuring the glucose concentration by detecting a change in viscosity in the inner space of the container by means of fluorescence polarization.

2. The method according to claim 1, wherein the glucose-binding lectin is concanavalin A or dextran.

3. The method according to claim 1, wherein the probe comprises a fluorophore and a carrier.

4. The method according to claim 3, wherein a protein is used as the carrier.

5. The method according to claim 3, wherein the fluorophore is a long-lived fluorophore with a fluorescence lifetime of >

100 ns.

6. The method according to claim 1, wherein the container is made of a semipermeable membrane selected from the group consisting of cellulose, cellulose derivatives, polyamide, polyamide derivatives, polysulfones and polysulfone derivatives.

7. The method according to claim 1, wherein the sensor comprises a light guide capable of beaming light in or out.

8. The method according to claim 1, wherein the determination of the glucose concentration is carried out continuously.

9. The method according to claim 1, the molecular weight of the probe is adjusted such that the probe cannot diffuse out of the container.