EP2181329A1 - Biosensor und seine verwendung sowie verfahren zur aufzeichnung der zellreaktion lebensfähiger zellen - Google Patents
Biosensor und seine verwendung sowie verfahren zur aufzeichnung der zellreaktion lebensfähiger zellenInfo
- Publication number
- EP2181329A1 EP2181329A1 EP09753959A EP09753959A EP2181329A1 EP 2181329 A1 EP2181329 A1 EP 2181329A1 EP 09753959 A EP09753959 A EP 09753959A EP 09753959 A EP09753959 A EP 09753959A EP 2181329 A1 EP2181329 A1 EP 2181329A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cell
- cells
- biosensor
- contact surface
- substances
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/5005—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving human or animal cells
Definitions
- the present invention is based on the use of ion-selective semiconductor sensors of the class of heterostructure semiconductors of the group III nitrides as a biosensor substrate.
- the electrical signature of preferably adherent cells can be measured.
- electronic signature means the inherent electrical potential of cells in general, which is realized by ion fluxes, cellular membranes and different intracellular and extracellular ionic concentrations.
- the electrical activity of e.g. Nerves or muscle cells are membrane-directed processes, i. the generation of potentials such as rest and action potential is caused by ion fluxes of different types of ions from the cell interior through the cell membrane into the extracellular space.
- the volume is now in the direction of the surface to which the cells adhere, determined by the mean distance from the cell membrane to the sensor surface plus the biocompatibility-producing coatings and functional layers, such as e.g. the layers of fibronectin or agarose serving as attachment or nutrient medium.
- sensors based on the class of Group III heterostructure semiconductors nitrides e.g.
- the AlGaN / GaN field effect transistors can realize biosensors that overcome these disadvantages.
- gelatin or fibronectin are buffer-like, gel-like systems which falsify potential ion fluxes from the cells or reduce charge changes in the gap between ISFET sensor and cell membrane.
- the volume of the surface coating has a decreasing concentration, ie distributions of small amounts of ions out of the cell through the cell membrane are further diluted by the liquid-impregnated volume of coating or volumes filled with liquid at a distance between cell membrane and coating.
- two-dimensional electron gases (2DEGs) can be achieved with surface charge densities of up to 2x10 13 cm "2
- ISFET ion-sensitive field-effect transistor
- Source Drain and an open gate.
- biosensor comprising biocompatible layer systems having a Group III nitride heterostructure of GaN / AlGaN, which is implemented as an ISFET with metallized contacts. Furthermore, the biosensor comprises a functional layer applied directly to the sensor surface, the construction and attachment of which is not described in detail.
- the object of the present invention is first of all to provide a biosensor with which it is possible to maximize the sensitivity of the measurement of the influence of adherent cells by different environmental influences such as the addition of poisons / toxins, electric fields, etc.
- the solution to this problem with a biosensor according to claim 1 or its use according to claim 7 and the method for recording a cell reaction according to claim 9 succeeds.
- nitrides e.g. AlGaN / GaN
- biosensors can be realized with which the influence of adherent cells by different environmental influences such as the addition of toxins / toxins, electric fields, etc. can be measured very sensitive.
- the electrical properties and the relatively large piezoelectric constants of group III nitrides are particularly interesting.
- the functionalization of the sensor surface is carried out with functional and vital cells. Surprisingly, a good compatibility between cells and semiconductor material was found, which was used according to the invention for the construction of a hybrid sensor having both biological and technical components.
- this biosensor according to the invention naturally only has a limited service life - due to the lifetime of the cells connected to it - it can be used within a period of several days to one to two weeks for novel detections.
- the biosensor according to the invention is suitable for the detection of substances or substances, forces and fields. It consists of a biocompatible layer system with a heterostructure of the group III nitrides, preferably of GaN / AlGaN, which is designed as an ISFET, preferably with metallized contacts is. It is furthermore essential for the biosensor according to the invention that a layer of adhering, preferably eukaryotic, cells is applied directly to the sensor surface, these cells being viable.
- the biosensor according to the invention is particularly suitable for measuring the concentration changes of ions in the layer of adhering cells applied directly to the sensor surface between cell membrane and sensor layer, wherein the electrical signature, ie the cell reaction of these cells, is recorded without an electrode connected to the cells.
- a significant advantage of the biosensor according to the invention is that it can be used to carry out a pH measurement which is not influenced by simultaneously existing redox properties of the fluid under investigation. This allows in particular the pH determination of blood.
- a biosensor with AlGaN / GaN structure is shown schematically.
- the biosensor comprises two electrical contacts 1, which serve to derive the sensor signal. Part of the sensor are still adherent, living cells 2.
- the cells 2 adhere via cell adhesion proteins 3 to a cell contact surface 4, which is provided by the AlGaN / GaN structure.
- the resulting distance between the cell membrane of the cells 2 and the cell-contacting surface 4 is a few tens to a few hundred nanometers. Any manipulation of the surface potential at the cell contact surface 4 results in a significant change in the drain current, which can be tapped as a sensor signal at the contacts 1. Therefore, an AlGaN / GaN transistor structure is suitable for the detection of ions or adsorbed polar molecules in liquid droplets deposited on the structure surface.
- the gate potential is determined by the liquid to be detected.
- the evaluation of the drain current enables the highly sensitive detection of polar liquids with a high dynamic range.
- the ISFET shows an intrinsic pH sensitivity at the Nernst limit. A linear correlation between pH and surface potential in the range of pH 2 to 12 could be demonstrated. Due to the high chemical stability of the group III nitrides for both alkalis and acids, the determination of pH values can therefore be carried out with high accuracy with the biosensor according to the invention. In addition, the high biological compatibility of the material system could be demonstrated.
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Immunology (AREA)
- Molecular Biology (AREA)
- Urology & Nephrology (AREA)
- Biomedical Technology (AREA)
- Chemical & Material Sciences (AREA)
- Hematology (AREA)
- Food Science & Technology (AREA)
- Analytical Chemistry (AREA)
- Microbiology (AREA)
- Cell Biology (AREA)
- Biotechnology (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Tropical Medicine & Parasitology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Pathology (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
- Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200810026930 DE102008026930A1 (de) | 2008-05-29 | 2008-05-29 | Biosensor und seine Verwendung |
PCT/EP2009/056628 WO2009144304A1 (de) | 2008-05-29 | 2009-05-29 | Biosensor und seine verwendung sowie verfahren zur aufzeichnung der zellreaktion lebensfähiger zellen |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2181329A1 true EP2181329A1 (de) | 2010-05-05 |
Family
ID=40940542
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09753959A Ceased EP2181329A1 (de) | 2008-05-29 | 2009-05-29 | Biosensor und seine verwendung sowie verfahren zur aufzeichnung der zellreaktion lebensfähiger zellen |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2181329A1 (de) |
DE (1) | DE102008026930A1 (de) |
WO (1) | WO2009144304A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2600148A1 (de) | 2011-11-29 | 2013-06-05 | ETH Zurich | Vorrichtung und Verfahren zur Bestimmung von Transportaktivität über eine Zellmembran |
WO2020188342A1 (en) * | 2019-03-21 | 2020-09-24 | Epitronic Holdings Pte. Ltd. | Microelectronic device for electronic sorbent assay and for monitoring biological cell dynamics comprising pseudo-conductive high-electron mobility transistor (hemt) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10062044B4 (de) | 2000-12-13 | 2006-03-16 | Eads Deutschland Gmbh | Ionensensitive Halbleitersensoren mit HEMT-Struktur |
-
2008
- 2008-05-29 DE DE200810026930 patent/DE102008026930A1/de not_active Withdrawn
-
2009
- 2009-05-29 EP EP09753959A patent/EP2181329A1/de not_active Ceased
- 2009-05-29 WO PCT/EP2009/056628 patent/WO2009144304A1/de active Application Filing
Non-Patent Citations (2)
Title |
---|
See also references of WO2009144304A1 * |
UJJWAL K ROUT ET AL: "Transforming growth factor-[beta]1 modulates expression of adhesion and cytoskeletal proteins in human peritoneal fibroblasts", FERTILITY AND STERILITY, vol. 78, no. 1, 1 July 2002 (2002-07-01), pages 154 - 161, XP055004612, ISSN: 0015-0282, DOI: 10.1016/S0015-0282(02)03176-X * |
Also Published As
Publication number | Publication date |
---|---|
DE102008026930A1 (de) | 2009-12-10 |
WO2009144304A1 (de) | 2009-12-03 |
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