WO2006124458A2 - Method and device for conducting biochemical or chemical reactions at multiple temperatures - Google Patents

Method and device for conducting biochemical or chemical reactions at multiple temperatures Download PDF

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Publication number
WO2006124458A2
WO2006124458A2 PCT/US2006/018088 US2006018088W WO2006124458A2 WO 2006124458 A2 WO2006124458 A2 WO 2006124458A2 US 2006018088 W US2006018088 W US 2006018088W WO 2006124458 A2 WO2006124458 A2 WO 2006124458A2
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WO
WIPO (PCT)
Prior art keywords
reaction
nucleic acid
droplet
electrowetting
path
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
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PCT/US2006/018088
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English (en)
French (fr)
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WO2006124458A3 (en
Inventor
Alexander D. Shenderov
Michael G. Pollack
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanolytics Inc
Duke University
Original Assignee
Nanolytics Inc
Duke University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to CA2606750A priority Critical patent/CA2606750C/en
Priority to AU2006247752A priority patent/AU2006247752B2/en
Priority to US11/912,913 priority patent/US9517469B2/en
Priority to JP2008511321A priority patent/JP2008539759A/ja
Priority to CN2006800254976A priority patent/CN101287845B/zh
Priority to EP06759494A priority patent/EP1885885A4/en
Priority to KR1020077028838A priority patent/KR101431775B1/ko
Application filed by Nanolytics Inc, Duke University filed Critical Nanolytics Inc
Publication of WO2006124458A2 publication Critical patent/WO2006124458A2/en
Anticipated expiration legal-status Critical
Publication of WO2006124458A3 publication Critical patent/WO2006124458A3/en
Priority to US13/006,798 priority patent/US9216415B2/en
Priority to US14/290,057 priority patent/US9452433B2/en
Priority to US15/367,046 priority patent/US20170080428A1/en
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L7/00—Heating or cooling apparatus; Heat insulating devices
    • B01L7/52—Heating or cooling apparatus; Heat insulating devices with provision for submitting samples to a predetermined sequence of different temperatures, e.g. for treating nucleic acid samples
    • B01L7/525—Heating or cooling apparatus; Heat insulating devices with provision for submitting samples to a predetermined sequence of different temperatures, e.g. for treating nucleic acid samples with physical movement of samples between temperature zones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
    • B01L3/502—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures
    • B01L3/5027—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip
    • B01L3/502769—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip characterised by multiphase flow arrangements
    • B01L3/502784—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip characterised by multiphase flow arrangements specially adapted for droplet or plug flow, e.g. digital microfluidics
    • B01L3/502792—Containers for the purpose of retaining a material to be analysed, e.g. test tubes with fluid transport, e.g. in multi-compartment structures by integrated microfluidic structures, i.e. dimensions of channels and chambers are such that surface tension forces are important, e.g. lab-on-a-chip characterised by multiphase flow arrangements specially adapted for droplet or plug flow, e.g. digital microfluidics for moving individual droplets on a plate, e.g. by locally altering surface tension
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
    • C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
    • C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
    • C12Q1/6844—Nucleic acid amplification reactions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2200/00—Solutions for specific problems relating to chemical or physical laboratory apparatus
    • B01L2200/06—Fluid handling related problems
    • B01L2200/0673—Handling of plugs of fluid surrounded by immiscible fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2300/00—Additional constructional details
    • B01L2300/06—Auxiliary integrated devices, integrated components
    • B01L2300/0627—Sensor or part of a sensor is integrated
    • B01L2300/0654—Lenses; Optical fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2300/00—Additional constructional details
    • B01L2300/08—Geometry, shape and general structure
    • B01L2300/0861—Configuration of multiple channels and/or chambers in a single devices
    • B01L2300/0864—Configuration of multiple channels and/or chambers in a single devices comprising only one inlet and multiple receiving wells, e.g. for separation, splitting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2300/00—Additional constructional details
    • B01L2300/08—Geometry, shape and general structure
    • B01L2300/0887—Laminated structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2300/00—Additional constructional details
    • B01L2300/08—Geometry, shape and general structure
    • B01L2300/089—Virtual walls for guiding liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2300/00—Additional constructional details
    • B01L2300/18—Means for temperature control
    • B01L2300/1805—Conductive heating, heat from thermostatted solids is conducted to receptacles, e.g. heating plates, blocks
    • B01L2300/1816—Conductive heating, heat from thermostatted solids is conducted to receptacles, e.g. heating plates, blocks using induction heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2300/00—Additional constructional details
    • B01L2300/18—Means for temperature control
    • B01L2300/1805—Conductive heating, heat from thermostatted solids is conducted to receptacles, e.g. heating plates, blocks
    • B01L2300/1827—Conductive heating, heat from thermostatted solids is conducted to receptacles, e.g. heating plates, blocks using resistive heater
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2300/00—Additional constructional details
    • B01L2300/18—Means for temperature control
    • B01L2300/1861—Means for temperature control using radiation
    • B01L2300/1872—Infrared light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L2400/00—Moving or stopping fluids
    • B01L2400/04—Moving fluids with specific forces or mechanical means
    • B01L2400/0403—Moving fluids with specific forces or mechanical means specific forces
    • B01L2400/0415—Moving fluids with specific forces or mechanical means specific forces electrical forces, e.g. electrokinetic
    • B01L2400/0427—Electrowetting

Definitions

  • reaction housing different parts of the reaction housing are kept at different temperatures, and reaction volume is brought in thermal contact with a desired part of the housing to keep it at the temperature of that part. If necessary, the reaction volume can then be moved to a different part of the housing to change the temperature; and, depending on the trajectory of the reaction volume, the temperature profile of it can be adjusted or cycled as desired.
  • the existing devices do not provide for passage of the reaction volume through a detection site during each thermal cycle, which would provide a real-time PCR capability. Nor do they employ a multitude of parallel channels, each containing multiple reaction volumes, to improve throughput.
  • a method for conducting a nucleic acid amplification reaction requiring different temperatures comprises the steps of: (a)providing at least one reaction droplet to an electrowetting array comprising at least two reaction zones, each reaction zone having a different temperature needed for the nucleic acid amplification reaction, the reaction droplet comprising a nucleic acid of interest and reagents needed to effect amplification of the nucleic acid; (b) conducting the nucleic acid amplification reaction by moving, using electrowetting, the at least one reaction droplet through the at least two reaction zones such that a first cycle of the nucleic acid amplification reaction is completed; and (c) optionally, repeating step (b) to conduct further cycles of the nucleic acid amplification reaction.
  • a method for amplifying a nucleic acid of interest comprises the steps of: (a) providing at least one reaction droplet to an electrowetting array, the reaction droplet comprising a nucleic acid of interest and reagents needed to effect amplification of the nucleic acid, the reagents including nucleic acid primers; (b) moving the droplet(s), using electrowetting, through a first reaction zone of the electrowetting array having a first temperature such that the nucleic acid of interest is denatured; (c) moving the droplet(s), using electrowetting, through a second reaction zone of the electrowetting array having a second temperature such that the primers are annealed to the nucleic acid of interest; (d) moving the droplet(s), using electrowetting, through a third reaction zone of the electrowetting array having a third temperature such that extension of the nucleic acid primers occurs, thus amplifying the nucleic acid of interest; and optionally repeating steps
  • An aspect of the method for amplifying a nucleic acid of interest disclosed above comprises the steps of: (a) providing at least one reaction droplet to an electrowetting array, the reaction droplet comprising a nucleic acid of interest and reagents needed to effect amplification of the nucleic acid, the reagents including nucleic acid primers; (b) moving the droplet(s), using electrowetting, through a first reaction zone of the electrowetting array having a first temperature such that the nucleic acid of interest is denatured; (c) moving the droplet(s), using electrowetting, through a second reaction zone of the electrowetting array having a second temperature such that the primers are annealed to the nucleic acid of interest and such that extension of the nucleic acid primers occurs, thus amplifying the nucleic acid of interest; and optionally repeating steps (b) and (c).
  • a device for conducting chemical or biochemical reactions at various temperatures comprises a microfluidics apparatus comprising at least one reaction path, at least one detection site, and at least one return path and means for actuating a reaction droplet or a reaction volume through the reaction path(s), detection zone(s), and return path(s).
  • the device also comprises at least two reaction zones, each reaction zone capable of maintaining a temperature different from the other reaction zones, where the reaction path travels through at least two reaction zones.
  • the device comprises a microfluidics apparatus comprising a plurality of reaction paths, at least one detection site, and at least one return path and means for actuating a reaction droplet or a reaction volume through the reaction paths, detection zone(s), and return path(s).
  • the device also comprises at least two reaction zones, each reaction zone capable of maintaining a temperature different from the other reaction zones, where each of the reaction paths travels through at least two reaction zones, and where at least one of the reaction paths is fluidly connected to at least one detection zone.
  • a device for conducting chemical or biochemical reactions at various temperatures is disclosed.
  • the device comprises an electrowetting array comprising a plurality of electrowetting electrodes forming at least one reaction path, at least one detection site, and at least one return path.
  • the device further comprises at least two reaction zones, each reaction zone capable of maintaining a temperature different from the other reaction zones, where the reaction path travels through at least two reaction zones and the electrowetting array is capable of manipulating a reaction droplet through the reaction path(s), detection zone(s), and return path(s).
  • the method comprises: (a) providing at least one reaction droplet to an electrowetting array comprising at least two reaction zones, each reaction zone having a different temperature needed for the reaction, the reaction droplet comprising reagents needed to effect the reaction; (b) conducting the reaction by moving, using electrowetting, the at least one reaction droplet through the at least two reaction zones such that a first cycle of the reaction is completed; and (c) optionally repeating step (b) to conduct further cycles of the reaction. [0012] An aspect of the method for conducting a reaction requiring different temperatures disclosed above is also provided.
  • the method comprises: (a) providing at least one reaction droplet or volume to a microfluidics apparatus comprising at least two reaction zones and at least one detection site, each reaction zone having a different temperature needed for the reaction, the reaction droplet comprising reagents needed to effect the reaction; (b) conducting the reaction by moving, using actuation means, the at least one reaction droplet or volume through the at least two reaction zones such that a first cycle of the reaction is completed; and (c) optionally repeating step (b) to conduct further cycles of the reaction.
  • Figure 1 illustrates a cross section of a portion of one embodiment of a device for conducting chemical or biochemical reactions that require multiple reaction temperatures.
  • Figure 2 illustrates an embodiment of a device for conducting real-time polymerase chain reaction using an electrowetting array.
  • the present invention relates to methods and devices for conducting chemical or biochemical reactions that require multiple reaction temperatures.
  • the methods involve moving one or more reaction droplets or reaction volumes through various reaction zones having different temperatures on a microfluidics apparatus.
  • the devices comprise a microfluidics apparatus comprising appropriate actuators capable of moving reaction droplets or reaction volumes through the various reaction zones.
  • the devices comprise an electrowetting array comprising a plurality of electrowetting electrodes, and the method involves using electrowetting to move one or more reaction droplets through various reaction zones on the electrowetting array having different temperatures in order to conduct the reaction.
  • the electrowetting array of the device may comprise one or more reaction paths that travel through at least two reaction zones of the device. Each reaction zone may be maintained at a separate temperature in order to expose the reaction droplets to the desired temperatures to conduct reactions requiring multiple reaction temperatures.
  • Each reaction path may comprise, for example, a plurality of electrodes on the electrowetting array that together are capable of moving individual droplets from one electrode to the next electrode such that the reaction droplets may be moved through the entire reaction path using electrowetting actuation.
  • Electrowetting arrays, electrowetting electrodes, and devices incorporating the same that may be used include those described in U.S. Patent Nos. 6,565,727 and 6,773,566 and U.S. Patent Application Publication Nos. 2004/0058450 and 2004/0055891 , the contents of which are hereby incorporated by reference herein.
  • Devices that may be used for conducting reactions requiring multiple reaction temperatures typically comprise a first, flat substrate and a second, flat substrate substantially parallel to the first substrate.
  • a plurality of electrodes that are substantially planer are typically provided on the first substrate.
  • Either a plurality of substantially planar electrodes or one large substantially planer electrode are typically provided on the second substrate.
  • at least one of the electrode or electrodes on either the first or second substrate are coated with an insulator.
  • An area between the electrodes (or the insulator coating the electrodes) on the first substrate and the electrodes or electrode (or the insulator coating the electrode(s)) on the second substrate forms a gap that is filled with filler fluid that is substantially immiscible with the liquids that are to be manipulated by the device.
  • FIG. 1 shows a cross section of a portion of one embodiment of a device for conducting chemical or biochemical reactions that require multiple reaction temperatures, with the reference numerals referring to the following: 22 — first substrate; 24 — second substrate; 26 — liquid droplet; 28a and 28b — hydrophobic insulating coatings; 30 — filler fluid; 32a and 32b — electrodes.
  • Other devices comprising electrodes on only one substrate (or devices containing only one substrate) may also be used for conducting reactions requiring multiple reaction temperatures.
  • a device with an electrowetting electrode array on only one substrate comprises a first substrate and an array of control electrodes embedded thereon or attached thereto.
  • a dielectric layer covers the control electrodes.
  • a two-dimensional grid of conducting lines at a reference potential is superimposed on the electrode array with each conducting line (e.g., wire or bar) running between adjacent drive electrodes.
  • Each reaction path of the devices for conducting chemical or biochemical reactions includes at least two reaction zones.
  • the reaction zones are maintained at specified temperatures such that reactions requiring multiple reaction temperatures may be conducted.
  • the reaction droplet or droplets are moved through (or allowed to remain in) each reaction zone for an appropriate time according to the specific reaction being performed.
  • the temperatures in the reaction zones are maintained at a substantially constant temperature using any type of heating or cooling, including, for example, resistive, inductive, or infrared heating.
  • the devices for conducting the reactions may further comprise the mechanisms for generating and maintaining the heat or cold needed to keep the reaction zones at a substantially constant temperature.
  • the devices for conducting chemical or biochemical reactions may optionally have a detection site positioned in or after the reaction paths.
  • the device comprises a detection site after the last reaction zone in each reaction path.
  • the detection site which is also part of the electrowetting array of the device, may be designed such that detection of indicia of the reaction (e.g., a label indicating that the reaction occurred or did not occur) or detection of an analyte in the reaction droplet (for quantitation, etc.) may be detected at the detection site.
  • the detection site may comprise a transparent or translucent area in the device such that optical indicia of a feature of the reaction may be optically or visually detected.
  • a detector may be positioned at the detection site such that the reaction indicia may be detected with or without a transparent or translucent area.
  • Translucent or transparent detection sites may be constructed using a substrate made from, for example, glass or plastic and an electrode made from, for example, indium tin oxide or a thin, transparent metal film.
  • Reaction indicia may comprise, for example, fluorescence, radioactivity, etc., and labels that may be used include fluorescent and radioactive labels.
  • the detection site may contain bound enzymes or other agents to allow detection of an analyte in the reaction droplets.
  • reaction path or paths of the device may comprise an array of electro wetting electrodes.
  • reaction paths may further comprise a conduit or channel for aiding in defining the fluid path.
  • Such channels or conduits may be part of the electrowetting electrodes themselves, may be part of an insulating coating on the electrodes, or may be separate from the electrodes.
  • the reaction paths may have various geometrical configurations.
  • the reaction paths may be a circular path comprising at least two reaction zones, a linear path that crosses at least two reaction zones, or other shaped paths.
  • the devices may comprise an array of electrowetting electrodes that includes multiple possible reaction paths and multiple reaction zones such that the device may be reconfigured for various reactions.
  • the device may also comprise a return path from the end of the reaction path or from the detection site (if the device includes a detection site after the end of the reaction path) to the beginning of the same reaction path (or to a new, identical reaction path) such that multiple cycles of the reaction may be conducted using the same reagents. That is, the device may contain a return path such that multiple reaction cycles may be conducted using a loop path or a meandering path for the total path of the reaction droplets. As with the reaction path and the detection site, the return path comprises one or more electrowetting electrodes and is part of the electrowetting array of the device. The return path may include a channel or conduit for aiding in defining the fluid path.
  • the return path may go through one or more of the reaction zones or may entirely bypass the reaction zones.
  • the return path may have a substantially constant temperature (different from or identical to one of the temperatures maintained in the reaction zones) that is maintained by appropriate heating or cooling mechanisms, hi addition, the return path may be operated such that reaction droplets are returned to the beginning of the same or a new reaction path faster than the time the reaction droplets spend in the reaction path.
  • there may be multiple return paths e.g., one return path for each reaction path
  • there may be less return paths than reaction paths e.g., only one return path).
  • the droplets may be manipulated on the electrowetting array such that the reaction droplets that traveled through a particular path on the first reaction cycle are returned to the identical reaction path for the second reaction cycle, therefore allowing results of each progressive cycle for a particular reaction droplet to be compared to the results of the previous cycles for the same reaction droplet.
  • the reaction droplets may be moved to the begimiing of the same reaction path without a return path in order to perform cycles of the same reaction.
  • a return path may not be needed where the reaction path and any detection site form a loop, or where the reaction path and any detection site do not form a loop (e.g., a linear path) and the reaction droplets are moved in the opposite direction along the same path to return them to the beginning of the same reaction path.
  • the devices comprising an electrowetting array are capable of moving the reaction droplets both unidirectionally in the array for some reactions as well as bidirectionally in a path, as needed.
  • the device may also comprise appropriate structures and mechanisms needed for dispensing liquids (e.g., reaction droplets, filling liquids, or other liquids) into the device as well as withdrawing liquids (e.g., reaction droplets, waste, filling liquid) from the device.
  • Such structures could comprise a hole or holes in a housing or substrate of the device to place or withdraw liquids from the gap in the electrowetting array.
  • Appropriate mechanisms for dispensing or withdrawing liquids from the device include those using suction, pressure, etc., and also include pipettes, capillaries, etc.
  • the methods of conducting chemical or biochemical reactions that require multiple reaction temperatures comprise providing at least one reaction droplet to an electrowetting array of a device described herein and then conducting the reaction by moving, using electrowetting, the at least one reaction droplet through the at least two reaction zones.
  • the at least two reaction zones are maintained at the different temperatures needed for the reaction.
  • the reaction may be repeated with the same reaction droplet by again moving, using electrowetting, the at least one reaction droplet through the at least two reaction zones. Such repetition may be desired where multiple reaction cycles are needed or preferred for a particular reaction.
  • the reaction droplet or droplets comprise the reagents needed to conduct the desired reaction, and the reaction droplets (including any sample to be tested) may be prepared outside of the device or may be prepared by mixing one or more droplets in the device using the electrowetting array. In addition, further reagents may be added to the reaction droplet (e.g., by mixing a new reaction droplet containing appropriate reagents) during the reaction or after a reaction cycle and before conducting a new reaction cycle.
  • the devices described herein are suitable for, but not limited to, conducting nucleic acid amplification reactions requiring temperature cycling. That is, the device is useful for conducting reactions for amplifying nucleic acids that require more than one temperature to conduct portions of the overall reaction such as, for example, denaturing of the nucleic acid(s), annealing of nucleic acid primers to the nucleic acid(s), and polymerization of the nucleic acids (i.e., extension of the nucleic acid primers).
  • nucleic acid amplification methods require cycling of the reaction temperature from a higher denaturing temperature to a lower polymerization temperature, and other methods require cycling of the reaction temperature from a higher denaturing temperature to a lower annealing temperature to a polymerization temperature in between the denaturing and annealing temperatures.
  • Some such nucleic acid amplification reactions include, but are not limited to, polymerase chain reaction (PCR), ligase chain reaction, and transcription-based amplification.
  • PCR polymerase chain reaction
  • ligase chain reaction ligase chain reaction
  • transcription-based amplification transcription-based amplification
  • the method comprises (a) providing at least one reaction droplet to an electrowetting array comprising at least two reaction zones and (b) conducting the reaction by moving, using electrowetting, the at least one reaction droplet through the at least two reaction zones such that a first cycle of the reaction is completed.
  • Each reaction zone has a different temperature needed for the reaction.
  • the reaction droplet comprises reagents needed to effect the reaction.
  • Step (b) may optionally be repeated in order to conduct further cycles of the reaction.
  • a method for conducting a nucleic acid amplification reaction requiring different temperatures is provided.
  • the method comprises (a) providing at least one reaction droplet to an electrowetting array comprising at least two reaction zones and (b) conducting the nucleic acid amplification reaction by moving, using electrowetting, the at least one reaction droplet through the at least two reaction zones such that a first cycle of the nucleic acid amplification reaction is completed.
  • Each reaction zone has a different temperature needed for the nucleic acid amplification reaction.
  • the reaction droplet comprises a nucleic acid of interest and reagents needed to effect amplification of the nucleic acid.
  • reagents may include appropriate nucleic acid primers, nucleotides, enzymes (e.g., polymerase), and other agents.
  • Step (b) may optionally be repeated in order to conduct further cycles of the nucleic acid amplification reaction.
  • another method for amplifying a nucleic acid of interest comprises the steps of (a) providing at least one reaction droplet to an electrowetting array, the reaction droplet comprising a nucleic acid of interest and reagents needed to effect amplification of the nucleic acid, the reagents including nucleic acid primers; (b) moving the droplet(s), using electrowetting, through a first reaction zone of the electrowetting array having a first temperature such that the nucleic acid of interest is denatured; (c) moving the droplet(s), using electrowetting, through a second reaction zone of the electrowetting array having a second temperature such that the primers are annealed to the nucleic acid of interest; and (d) moving the droplet(s), using electrowetting, through a third reaction zone of the electrowetting array having a third temperature such that extension of
  • another method for amplifying a nucleic acid of interest comprising the steps of: (a) providing at least one reaction droplet to an electrowetting array, the reaction droplet comprising a nucleic acid of interest and reagents needed to effect amplification of the nucleic acid, the reagents including nucleic acid primers; (b) moving the droplet(s), using electrowetting, through a first reaction zone of the electrowetting array having a first temperature such that the nucleic acid of interest is denatured; (c) moving the droplet(s), using electrowetting, through a second reaction zone of the electrowetting array having a second temperature such that the primers are annealed to the nucleic acid of interest and such that extension of the nucleic acid primers occurs, thus amplifying the nucleic acid of interest.
  • Steps (b) and (c) may optionally be repeated in order to conduct further cycles of the nucleic acid amplification reaction.
  • the reagents in the reaction droplets may include deoxynucleoside triphosphates, nucleic acid primers, and a polymerase such as, for example, a thermostable polymerase such as Tag DNA polymerase.
  • a polymerase such as, for example, a thermostable polymerase such as Tag DNA polymerase.
  • a method is disclosed for conducting chemical or biochemical reactions at various temperatures by moving multiple reaction droplets through parts of a housing kept at desired temperatures, with or without them moving through a detection site at desired time points.
  • the device provided for this purpose comprises path(s) for moving the reactions through the zones having controlled temperature, optional detection sites, and optional return paths for repeating a temperature cycle a desired number of times.
  • FIG. 2 A particular embodiment for realizing real-time PCR is shown in Figure 2.
  • fourteen parallel lines of electrowetting control electrodes provide actuation for moving reaction droplets through three temperature zones. Each path is initially loaded with up to ten PCR reaction droplets. Each of the paths passes through a dedicated detection site as the droplets exit the last temperature-controlled zone. Fluorescence measurements are taken, and then a particular droplet is either discarded or returned to the first temperature zone using a return path.
  • a single return path is utilized for all fourteen active paths. Preferably, this arrangement is used when the return loop path can be operated at higher throughput than each of the paths through temperature-controlled zones.
  • the matching switching frequency for fourteen forward paths and a single return path will be 280 Hz.
  • provisions are made to reorder the reaction droplets so they enter and exit each cycle in exactly the same sequence. This, in particular, is useful for quantitative PCR (when all reactions should be exposed to very similar, ideally identical, temperature histories).
  • a device for conducting chemical or biochemical reactions that requires multiple reaction temperatures may comprise a microfluidics apparatus comprising at least one reaction path that travels through at least two reactions zones on the device.
  • the device may include one or more detection sites and one or more return paths.
  • the device further comprises means for actuating a reaction droplet or a reaction volume through the reaction path(s), detection site(s), and/or return path(s), and such reaction path(s), detection site(s), and/or return path(s) of the device may be fluidly connected in various ways.
  • the device includes multiple reaction paths that travel through at least two reaction zones, wherein each reaction path may include multiple reaction droplets/volumes.
  • the device includes at least one detection site in or after the one or more reaction paths.
  • the detection site(s) and one or more of the reaction paths may be fluidly connected.
  • the reaction paths may have various geometrical configurations.
  • the reaction paths may be a circular path comprising at least two reaction zones, a linear path that crosses at least two reaction zones, or other shaped paths.
  • the devices may also comprise a return path from the end of the reaction path or from the detection site (if the device includes a detection site after the end of the reaction path) to the beginning of the same reaction path (or to a new, identical reaction path) such that multiple cycles of the reaction may be conducted using the same reagents. That is, the device may contain a return path such that multiple reaction cycles may be conducted using a loop path or a meandering path for the total path of the reaction droplets/volumes.
  • the return path may go through one or more of the reaction zones or may entirely bypass the reaction zones.
  • the return path may have a substantially constant temperature (different from or identical to one of the temperatures maintained in the reaction zones) that is maintained by appropriate heating or cooling mechanisms.
  • the return path may be operated such that reaction droplets/volumes are returned to the beginning of the same or a new reaction path faster than the time the reaction droplets/volumes spend in the reaction path.
  • the droplets/volumes may be manipulated on the apparatus such that the reaction droplets/volumes that traveled through a particular path on the first reaction cycle are returned to the identical reaction path for the second reaction cycle, therefore allowing results of each progressive cycle for a particular reaction droplet/volume to be compared to the results of the previous cycles for the same reaction droplet/volume.
  • the reaction droplets/volumes may be moved to the beginning of the same reaction path without a return path in order to perform cycles of the same reaction.
  • a return path may not be needed where the reaction path and any detection site form a loop, or where the reaction path and any detection site do not form a loop (e.g., a linear path) and the reaction droplets/volumes are moved in the opposite direction along the same path to return them to the beginning of the same reaction path.
  • Multiple reaction volumes/droplets may be simultaneously moved through the microfluidics apparatus.
  • multiple reaction paths may be used having multiple reaction volumes/droplets.
  • the device comprises multiple reaction paths, at least one detection site either in or after one of the reaction paths, and at least one return path.
  • the multiple reaction paths, the at least one detection site, and the return paths may be fluidly connected to form a loop.
  • multiple loops may be formed.
  • the methods of conducting chemical or biochemical reactions that require multiple reaction temperatures comprise providing at least one reaction droplet/volume to a microfiuidics apparatus described herein and then conducting the reaction by moving, using any actuation means, the at least one reaction droplet/volume through the at least two reaction zones.
  • the at least two reaction zones are maintained at the different temperatures needed for the reaction.
  • the reaction may be repeated with the same reaction droplet by again moving, using the actuation means, the at least one reaction droplet through the at least two reaction zones. Such repetition may be desired where multiple reaction cycles are needed or preferred for a particular reaction.

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PCT/US2006/018088 2005-05-11 2006-05-10 Method and device for conducting biochemical or chemical reactions at multiple temperatures Ceased WO2006124458A2 (en)

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KR1020077028838A KR101431775B1 (ko) 2005-05-11 2006-05-10 복수의 온도에서 생화학적 또는 화학적 반응을 수행하기위한 방법 및 장치
US11/912,913 US9517469B2 (en) 2005-05-11 2006-05-10 Method and device for conducting biochemical or chemical reactions at multiple temperatures
JP2008511321A JP2008539759A (ja) 2005-05-11 2006-05-10 多数の温度で生化学的又は化学的な反応を実施する方法及び装置
CN2006800254976A CN101287845B (zh) 2005-05-11 2006-05-10 用于在多个温度下进行生化或化学反应的方法和设备
EP06759494A EP1885885A4 (en) 2005-05-11 2006-05-10 METHOD OR DEVICE FOR CONDUCTING CHEMICAL OR BIOCHEMICAL REACTIONS AT MULTIPLE TEMPERATURES
CA2606750A CA2606750C (en) 2005-05-11 2006-05-10 Method and device for conducting biochemical or chemical reactions at multiple temperatures
AU2006247752A AU2006247752B2 (en) 2005-05-11 2006-05-10 Method and device for conducting biochemical or chemical reactions at multiple temperatures
US13/006,798 US9216415B2 (en) 2005-05-11 2011-01-14 Methods of dispensing and withdrawing liquid in an electrowetting device
US14/290,057 US9452433B2 (en) 2005-05-11 2014-05-29 Method and device for conducting biochemical or chemical reactions at multiple temperatures
US15/367,046 US20170080428A1 (en) 2005-05-11 2016-12-01 Device for conducting biochemical or chemical reactions

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US13/006,798 Continuation US9216415B2 (en) 2005-05-11 2011-01-14 Methods of dispensing and withdrawing liquid in an electrowetting device
US14/290,057 Division US9452433B2 (en) 2005-05-11 2014-05-29 Method and device for conducting biochemical or chemical reactions at multiple temperatures
US15/367,046 Continuation US20170080428A1 (en) 2005-05-11 2016-12-01 Device for conducting biochemical or chemical reactions

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