DE10200549A1 - Sorting and counting of biological particles, comprises marking with paramagnetic or dielectric nanoparticles, to be passed a sensor which registers field changes to give signals which can be counted electronically - Google Patents
Sorting and counting of biological particles, comprises marking with paramagnetic or dielectric nanoparticles, to be passed a sensor which registers field changes to give signals which can be counted electronicallyInfo
- Publication number
- DE10200549A1 DE10200549A1 DE10200549A DE10200549A DE10200549A1 DE 10200549 A1 DE10200549 A1 DE 10200549A1 DE 10200549 A DE10200549 A DE 10200549A DE 10200549 A DE10200549 A DE 10200549A DE 10200549 A1 DE10200549 A1 DE 10200549A1
- Authority
- DE
- Germany
- Prior art keywords
- biological particles
- particles
- sensor
- counting
- marked
- 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.)
- Withdrawn
Links
- 239000002245 particle Substances 0.000 title claims abstract description 29
- 239000002105 nanoparticle Substances 0.000 title claims abstract description 6
- 230000005298 paramagnetic effect Effects 0.000 title claims abstract description 5
- 230000005291 magnetic effect Effects 0.000 claims abstract description 7
- 108090000623 proteins and genes Proteins 0.000 claims abstract 4
- 241000700605 Viruses Species 0.000 claims abstract 3
- 102000004169 proteins and genes Human genes 0.000 claims abstract 3
- 239000000523 sample Substances 0.000 claims abstract 3
- 238000000034 method Methods 0.000 claims description 11
- 239000007790 solid phase Substances 0.000 claims description 2
- 230000004523 agglutinating effect Effects 0.000 claims 1
- 230000001588 bifunctional effect Effects 0.000 claims 1
- 238000002372 labelling Methods 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 4
- 239000003463 adsorbent Substances 0.000 abstract 2
- 230000002068 genetic effect Effects 0.000 abstract 2
- 239000012530 fluid Substances 0.000 abstract 1
- 239000011049 pearl Substances 0.000 abstract 1
- 239000011324 bead Substances 0.000 description 5
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000000684 flow cytometry Methods 0.000 description 2
- 238000011002 quantification Methods 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000004520 agglutination Effects 0.000 description 1
- 230000008827 biological function Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003891 environmental analysis Methods 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011534 wash buffer Substances 0.000 description 1
Classifications
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- 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
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/54313—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals the carrier being characterised by its particulate form
- G01N33/54326—Magnetic particles
-
- G01N15/1023—
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N15/1031—Investigating individual particles by measuring electrical or magnetic effects thereof, e.g. conductivity or capacity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0266—Investigating particle size or size distribution with electrical classification
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/10—Investigating individual particles
- G01N2015/1006—Investigating individual particles for cytology
-
- G01N2015/1024—
-
- G01N2015/1028—
Abstract
Description
Techniken zur magnetischen Trennung von Zellen gehen bis in den Anfang der Nanobiotechnologie in den 90-er Jahren zurück. Die immer fortschreitende Integration von biologischen Funktionen in mikroelektromechanische Systeme (BioMEMS) führte 1996 zur Veröffentlichung eines voll integrierten magnetischen "Filters" für biologische Partikel. Seit 2001 gibt es "Bio- Chips" für intelligente Mikrosysteme, die den empfindlichen qualitativ-magnetischen Nachweis von relevanten Stoffen in der medizinischen Diagnostik ermöglichen. Techniques for magnetic separation of cells go all the way the beginning of nanobiotechnology back in the 90s. The progressive integration of biological Functions in microelectromechanical systems (BioMEMS) 1996 to release a fully integrated magnetic "Filters" for biological particles. Since 2001 there have been "organic Chips "for intelligent microsystems that are sensitive qualitative-magnetic detection of relevant substances in the enable medical diagnostics.
Im Bereich der biomedizinisch-analytischen Messtechnik zeichnet sich schon heute ab, dass mit sogenannten lab-onchip-Systemen große Teile der medizinischen Diagnostik, Umweltanalytik und Qualitätskontrollen in der Lebensmittelindustrie von komplizierten Labormeßstationen auf billige, einfach zu bedienende mikroelektronische Systeme übertragbar sind. In the field of biomedical-analytical measurement technology is already emerging today with so-called lab-onchip systems large parts of medical diagnostics, Environmental analysis and quality controls in the Food industry from complicated laboratory measuring stations cheap, easy-to-use microelectronic systems are transferable.
Für die Zählung bzw. Sortierung von Zellen sind inzwischen Verfahren geschützt, die komplexe durchflußcytometrische Analysen mit mobilen bench-top-Geräten ermöglichen (US 6097485). Andere beschreiben das nützliche Zusammenwirken von klassischer Durchflußcytometrie und magnetischen Partikeln als Festphasen (US 6280618 B2). Ein anderes Patent schildert die Zählung von magnetisch markierten Zellen in einer mikrosystemtechnischen Einheit (DE 199 39 208). For the counting or sorting of cells are meanwhile Process protected, the complex flow cytometric Enable analysis with mobile bench-top devices (US 6097485). Others describe the useful interaction of classic flow cytometry and magnetic particles as solid phases (US 6280618 B2). Another patent describes the counting of magnetically marked cells in one microsystem unit (DE 199 39 208).
Diese Quantifizierung von Zellen erfolgt derzeit, trotz dem stark weiter entwickelten Stand der Technik, mit der in Betrieb und Anschaffung äußerst teuren, aber für Sonderanwendungen geeigneten Durchflußcytometrie, mit zeitraubenden Kulturverfahren oder mit nur halbquantitativen Schnellverfahren. This quantification of cells is currently taking place, despite that highly developed state of the art with which in Operation and purchase extremely expensive, but for Flow cytometry suitable for special applications time-consuming culture processes or with only semi-quantitative Quick method.
Der Stand der Technik erlaubt noch keine Sortierung und Quantifizierung biologischen Partikeln mit mobilen und preiswerten Vorrichtungen oder ist nicht derart aufgebaut, dass mit den derzeit verfügbaren Sensoren eine maximale Messgenauigkeit erreicht wird. The state of the art does not yet allow sorting and Quantification of biological particles with mobile and inexpensive devices or is not constructed in such a way that with the currently available sensors a maximum Measurement accuracy is achieved.
Die Nachweisgrenze des Standes der Technik der Detektion von mit biologischen Partikeln verbundenen magnetisierbaren Beads soll wesentlich herabgesetzt werden. The detection limit of the prior art for the detection of magnetizable beads associated with biological particles should be significantly reduced.
Es soll eine Methode entwickelt werden, um auch in komplexen Matrizes biologische Partikel exakt zu sortieren und zu quantifizieren. A method is to be developed, even in complex Matrices to sort and sort biological particles exactly quantify.
Die gesuchten Zellen sollen nicht agglutinierend über . Antikörpern mit magnetisierbaren Nanopartikeln markiert werden. Anschließend werden im Magnetfeld die Zellen von dem Umgebungsmedium abgetrennt. Darauf werden die Zellen im Hüllflußstrom durch einen Mikrochip gepumpt und ergeben dort an einem Sensor ein elektronisches Meßsignal. Dieses analoge Signal wird mittels einer geeigneten Elektronik als Meßwert dargestellt. The cells sought should not over agglutinate. Antibodies labeled with magnetizable nanoparticles become. Then the cells of the Surrounding medium separated. Then the cells in the Sheath flow stream pumped through a microchip and result there an electronic measurement signal on a sensor. This analog The signal is measured using suitable electronics shown.
In einem bevorzugten Ausführungsbeispiel wird eine zu untersuchende Probe (2) zu einem vorgefertigten Reagenz in einem Einweggefäß (4) gegeben, welches in eine Öffnung an der gesamten Messvorrichtung eingesetzt werden kann. Das vorgefertigte Reagenz ist derart hergestellt, dass sich einzelne paramagnetische Beads (5-500 nm) spezifisch an die Zielpartikel anlagern, ohne dass es zu einer Agglutination der biologischen Partikel kommt. Dies kann entweder durch ein geeignetes Mischungsverhältnis von Antikörper-beschichteten Beads und biologischen Partikeln erreicht werden, oder durch den Einsatz von monovalenten Beads (Beads mit nur einer Bindungsstelle). In a preferred embodiment, a sample ( 2 ) to be examined is added to a prefabricated reagent in a disposable container ( 4 ) which can be inserted into an opening in the entire measuring device. The prefabricated reagent is produced in such a way that individual paramagnetic beads (5-500 nm) attach specifically to the target particles without causing agglutination of the biological particles. This can be achieved either by a suitable mixing ratio of antibody-coated beads and biological particles, or by using monovalent beads (beads with only one binding site).
In der Messvorrichtung wird nach einer Inkubation unter regulierten Bedingungen die Mischung aus Reagenz und Probe durch ein Dreiwegeventil (7) mittels einer Pumpe (9) angesaugt. Mit dieser Pumpe kann anhand der Drehzahl oder ähnlicher Parameter die genaue geförderte Flüssigkeitsmenge bestimmt werden. Während des Ansaugvorganges ist der Rückhalte-Elektromagnet (32) angeschalten und bewirkt, dass markierte biologische Partikel an der Innenwand der Teflonkapillare (31) zurückgehalten werden, während die übrige Probe mit nicht markierten Partikeln durch das Dreiwegeventil (8) und die Pumpe (9) in das Auffangbehältnis (14) fließt. Ist die gesamte Probe in die Kapillare gesaugt, so dass mittels einem Leitfähigkeitssensor das Ansaugen von Luft in das Verbindungsstück zwischen Ventil (7) und Gefäß (4) gemessen wird, so wird am Ventil (7) die Verbindung zwischen dem Waschpufferbehälter (12) und der Kapillare geöffnet. Dadurch werden die in der Kapillare festgehaltenen markierten Zellen mit einem festgelegten Volumen gewaschen. After an incubation under regulated conditions, the mixture of reagent and sample is drawn into the measuring device through a three-way valve ( 7 ) by means of a pump ( 9 ). This pump can be used to determine the exact amount of liquid delivered based on the speed or similar parameters. During the suction process, the retention electromagnet ( 32 ) is switched on and causes marked biological particles to be retained on the inner wall of the Teflon capillary ( 31 ), while the remaining sample with unmarked particles is held by the three-way valve ( 8 ) and the pump ( 9 ). flows into the collecting container ( 14 ). If the entire sample sucked into the capillary is measured so that by means of a conductivity sensor the suction of air into the connection piece between the valve (7) and container (4), so the valve (7), the connection between the wash buffer container (12) and the capillary opened. As a result, the labeled cells held in the capillary are washed with a fixed volume.
Danach wird am Ventil (8) die Verbindung von der Kapillare zur Mikrofluidik des mikroelektromechanischen System (40) umgeleitet. Gleichzeitig wird der Elektromagnet (32) ausgeschaltet. Und mit der Pumpe (10) oder Flüssiggaspatrone wird ein konstanter Druck der Hüllflußflüssigkeit aus Behälter (16) in der Hüllflußkammer (44) erzeugt. Die Piezopumpe (42) pumpt nun mit geregelter Flußrate die aus der Kapillare (31) mobilisierten markierten biologischen Partikel in die Hüllflußkammer (44). Dort werden die Partikel perlenschnurartig hintereinander gereiht und an einem . magnetoresistiven Sensor (46) vorbeigeführt. Die Partikel werden mit dem Hüllfluß im Einweggefäß (6) aufgefangen. Die Pumpe (42), die Hüllflußkammer (44) und der Sensor (46) sind mit allen Verbindungsleitungen als eine Einheit von mikroelektromechanischem System und Mikrofluidik aufgebaut, die modulartig in der Messvorrichtung ausgetauscht werden kann. The connection from the capillary to the microfluidic of the microelectromechanical system ( 40 ) is then diverted at the valve ( 8 ). At the same time, the electromagnet ( 32 ) is switched off. And with the pump ( 10 ) or liquid gas cartridge, a constant pressure of the envelope flow liquid from the container ( 16 ) is generated in the envelope flow chamber ( 44 ). The piezo pump ( 42 ) now pumps the marked biological particles mobilized from the capillary ( 31 ) into the envelope flow chamber ( 44 ) at a controlled flow rate. There the particles are lined up one after the other like pearl strings and on one. magnetoresistive sensor ( 46 ) passed. The particles are collected with the enveloping flow in the disposable container ( 6 ). The pump ( 42 ), the envelope flow chamber ( 44 ) and the sensor ( 46 ) are constructed with all the connecting lines as a unit of a microelectromechanical system and microfluidics, which can be exchanged in a modular manner in the measuring device.
Das Meßsignal des magnetischen Sensors (46) wird in einer geeigneten Vorrichtung aus rauscharmem Verstärker, Analog- Digital-Wandler, Computer, Software, Display und Drucker in einer für den Anwender nutzbaren Form dargestellt. Hierbei wird die Anzahl und Stärke der einzelnen, durch markierte Partikel bedingte, Feldänderungen ausgewertet und mit dem entsprechenden Volumina verrechnet. The measurement signal of the magnetic sensor ( 46 ) is shown in a suitable device consisting of a low-noise amplifier, analog-digital converter, computer, software, display and printer in a form that can be used by the user. The number and strength of the individual field changes caused by marked particles are evaluated and offset against the corresponding volumes.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10200549A DE10200549A1 (en) | 2002-01-09 | 2002-01-09 | Sorting and counting of biological particles, comprises marking with paramagnetic or dielectric nanoparticles, to be passed a sensor which registers field changes to give signals which can be counted electronically |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE10200549A DE10200549A1 (en) | 2002-01-09 | 2002-01-09 | Sorting and counting of biological particles, comprises marking with paramagnetic or dielectric nanoparticles, to be passed a sensor which registers field changes to give signals which can be counted electronically |
Publications (1)
Publication Number | Publication Date |
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DE10200549A1 true DE10200549A1 (en) | 2003-07-10 |
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DE10200549A Withdrawn DE10200549A1 (en) | 2002-01-09 | 2002-01-09 | Sorting and counting of biological particles, comprises marking with paramagnetic or dielectric nanoparticles, to be passed a sensor which registers field changes to give signals which can be counted electronically |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2301416A1 (en) * | 2006-12-15 | 2008-06-16 | Universidad De Zaragoza | Apparatus for the analysis and quantification of the analyte concentration in a sample, using magnetoresistive sensors |
WO2012052392A1 (en) * | 2010-10-21 | 2012-04-26 | Siemens Aktiengesellschaft | Magnetic flow cytometry |
CN108444876A (en) * | 2018-03-09 | 2018-08-24 | 国家纳米科学中心 | A kind of assay method of nano grain surface adhesion protein ligand state |
WO2021185599A1 (en) * | 2020-03-16 | 2021-09-23 | Miltenyi Biotec B.V. & Co. KG | Microfabricated sorter with magnetic sorting stage and droplet dispenser |
-
2002
- 2002-01-09 DE DE10200549A patent/DE10200549A1/en not_active Withdrawn
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2301416A1 (en) * | 2006-12-15 | 2008-06-16 | Universidad De Zaragoza | Apparatus for the analysis and quantification of the analyte concentration in a sample, using magnetoresistive sensors |
WO2008071820A1 (en) * | 2006-12-15 | 2008-06-19 | Universidad De Zaragoza | Apparatus for the analysis and quantification of the analyte concentration in a sample, using magnetoresistive sensors |
WO2012052392A1 (en) * | 2010-10-21 | 2012-04-26 | Siemens Aktiengesellschaft | Magnetic flow cytometry |
CN108444876A (en) * | 2018-03-09 | 2018-08-24 | 国家纳米科学中心 | A kind of assay method of nano grain surface adhesion protein ligand state |
CN108444876B (en) * | 2018-03-09 | 2020-06-16 | 国家纳米科学中心 | Method for determining state of protein ligand adsorbed on surface of nanoparticle |
WO2021185599A1 (en) * | 2020-03-16 | 2021-09-23 | Miltenyi Biotec B.V. & Co. KG | Microfabricated sorter with magnetic sorting stage and droplet dispenser |
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