insulator based dielectrophoresis (idep) presentation.pdf · 2011. 9. 26. · 4 idep can...
TRANSCRIPT
Alfredo M. Alfredo M. MoralesMoralesaa, William D. , William D. MunslowMunslowbb, , Scott M. Scott M. MaurerMaurerbb, Blake A. , Blake A. SimmonsSimmonsaa
a a Sandia National Laboratories, Livermore, CA 94550Sandia National Laboratories, Livermore, CA 94550b b Lockheed Martin MS2, Manassas, VA 20110Lockheed Martin MS2, Manassas, VA 20110
Authorized for Unlimited Public Release by SNL SAND2009Authorized for Unlimited Public Release by SNL SAND2009--3326C3326CAnd by LMC BAL200902002And by LMC BAL200902002--02 02
NBC 2009 SymposiumNBC 2009 SymposiumJyvJyvääskylskylää, Finland, Finland8 8 –– 11 June 200911 June 2009
Insulator Based Insulator Based DielectrophoresisDielectrophoresis ((iDEPiDEP):):A Tool to Detect, Separate and Concentrate A Tool to Detect, Separate and Concentrate
Aerosolized Biological ParticlesAerosolized Biological Particles
2
Biological Sensor RequirementsBiological Sensor Requirements
•• Requirements and Performance Measures:Requirements and Performance Measures:Affordability Affordability -- Early detection Early detection -- Low false alarm rateLow false alarm rate
•• Current Biological Detection System Deficiencies:Current Biological Detection System Deficiencies:Expensive Expensive -- Hours/days for analysis Hours/days for analysis -- Sensitivity Sensitivity vsvs false alarm ratefalse alarm rate
•• Desirable Characteristics of Typical DetectDesirable Characteristics of Typical Detect--toto--Warn Sensor:Warn Sensor:Spider Charts: metrics shown by length of legsSpider Charts: metrics shown by length of legs
Response Time (min)
FAR (per year)
Maintenance Interval (wks)
Size (m3)
Operating Cost ($/year)
Unit Cost ($M)
Detection Confidence
100
1
2
1000 100
1000500
98
110
.5
4
.1
0.5
1.5
1.0
4
95
90
10.000
1001,000
Sensitivity (ACPLA)
52
26
Response Time (min)
FAR (per year)
Maintenance Interval (wks)
Size (m3)
Operating Cost ($/year)
Unit Cost ($M)
Detection Confidence
100
1
2
1000 100
1000500
98
110
.5
4
.1
0.5
1.5
1.0
4
95
90
10.000
1001,000
Sensitivity (ACPLA)
52
26
Response Time (min)
FAR (per year)
Maintenance Interval (wks)
Size (m3)
Operating Cost ($/year)
Unit Cost ($M)
Detection Confidence
100
1
2
1000 100
1000500
98
110
.5
4
.1
0.5
1.5
1.0
4
95
90
10.000
1001,000
Sensitivity (ACPLA)
52
26
Ideal Biological Detection System:Ideal Biological Detection System:•• Low cost, low consumables and simple Low cost, low consumables and simple
operationoperation•• Operational flexibility: Configurable as either Operational flexibility: Configurable as either
detectdetect--toto--warn or as a detectwarn or as a detect--toto--treat system treat system •• Expensive bioassays may be used if Expensive bioassays may be used if
inexpensive orthogonal triggers limit the inexpensive orthogonal triggers limit the number of times bioassays are runnumber of times bioassays are run
3
Why an Why an iDEPiDEP Approach?Approach?
Flow
500 VDC 750 VDC 1000 VDC+ -
Flow
Separation by size: 2 μm (green) and 1 μm (red) Time
Time
Bacillus subtilisspores (red) trapped. 1 μm polystyrene beads (green) pass.
iDEP Selectively Traps Particles and May be Used as a TriggeriDEP Selectively Traps Particles and May be Used as a Trigger
Lapizco-Encinas, B. H.; Simmons, B.A., et al. , Anal. Chem. 2004, 76, 1571-1579
+-
4
iDEPiDEP Can Concentrate Bacteria SelectivelyCan Concentrate Bacteria Selectively
•• iDEPiDEP Separation of Live B. Separation of Live B. subtilissubtilis and B. cereus (similar bacteria)and B. cereus (similar bacteria)•• Mechanism: Different Size and ShapeMechanism: Different Size and Shape•• Also Separated E. coli, B. cereus, B. Also Separated E. coli, B. cereus, B. subtilissubtilis, B. , B. megateriummegaterium, B. , B. subtilissubtilis
spores, TMV virus, and polystyrene particles of various sizesspores, TMV virus, and polystyrene particles of various sizes
0
10
20
30
40
50
60
70
80
E. coli B. megaterium B. subtilis B.cereus
Min
imum
E re
quire
d fo
r DEP
trap
ping
(V/m
m)
medium conductivity = 2.2 microS/mm
medium conductivity = 10.4 microS/mm
Solution Conductivity=2.2microS/cmSolution Conductivity=2.2microS/cm
Solution Conductivity=10microS/cmSolution Conductivity=10microS/cm
Selectively trapping B. cereus (green)while passing B. subtilis (red)
E. coli < B. megaterium < B. subtilis < B. cereus
Lapizco-Encinas, B. H.; Simmons, B.A., et al. , Electrophoresis 2004, 25,1695-1704.
- +
5
iDEPiDEP is a Physically Selective Phenomenonis a Physically Selective Phenomenon
•• DEP: Motion of Conductive Object Toward DEP: Motion of Conductive Object Toward (away from) High Electric Field(away from) High Electric Field
–– Along electric field gradientsAlong electric field gradients–– Nonlinear in the applied electric fieldNonlinear in the applied electric field
•• DEP Force Proportional to:DEP Force Proportional to:–– Particle volumeParticle volume–– Conductivity + Conductivity + polarizabilitypolarizability difference difference
between particle and liquidbetween particle and liquid
---
+++
+
Net movement
Lower charge density
Electrode
Elec
trode
Nonuniform electric field
---
+++
+
-Net movement
Higher charge density
Lower charge density
Electrode
Elec
trode
Nonuniform electric field
-
•• DEP Force depend on:DEP Force depend on:–– Conductivity of the particle, Conductivity of the particle, pp–– Conductivity of the medium, Conductivity of the medium, mm–– Size of the particle, Size of the particle, rr
23 ~,~Re2 EfrF mpmoDEP
mpmpmpf 2),( Vdc,For
iDEPiDEP Uses Insulating Post Uses Insulating Post Features to Shape EFeatures to Shape E--fieldfield
Sabounchi, P.; Morales, A.M. et al. Biomed Microdevices, 2008, 10, 661–670.
6
iDEPiDEP with Pressure Driven Flowwith Pressure Driven Flow
•• Large Sample Volumes Must be Processed for Many Clinical ApplicaLarge Sample Volumes Must be Processed for Many Clinical Applicationstions•• Only Pressure Driven Flow can Process Such VolumesOnly Pressure Driven Flow can Process Such Volumes
Electrokinetic Flow Profile
Pressure Driven Flow Profile
iDEP Force
Force due to flow
•• Potential Attributes of Biological Potential Attributes of Biological Sensor Incorporating Sensor Incorporating iDEPiDEP::
–– Affordability: Affordability: iDEPiDEP trigger for bioassaytrigger for bioassay–– Early Detection: Response within Early Detection: Response within
seconds of turning onseconds of turning on–– Low False Alarm Rate: Orthogonal Low False Alarm Rate: Orthogonal
iDEPiDEP triggertrigger
FUparticleparticle )(u-dt
dum
)( EEEUu DEPEKparticle
Fluid FlowFluid Flow ElectrokineticElectrokineticVelocityVelocity
DielectrophoreticDielectrophoreticVelocityVelocity
A Significant Amount of Work A Significant Amount of Work Done in the Lab.Done in the Lab.
What Will it Take to Field What Will it Take to Field iDEPiDEP??
7
MicroMicro--molded molded iDEPiDEP ZeonorZeonor ChipsChips
•• Polymer Polymer iDEPiDEP Chips:Chips:–– Low Cost & Ease of ManufactureLow Cost & Ease of Manufacture–– Amenable to Large Scale ProductionAmenable to Large Scale ProductionR1 R2 R3 R4
x y
8
Chip Surface and Buffer Chemistry Is CriticalChip Surface and Buffer Chemistry Is Critical
•• Surface & buffer chemistry enable repeatable trapping with pressSurface & buffer chemistry enable repeatable trapping with pressure driven flowure driven flow
•• MOPA Treatment Lowers Contact angle, MOPA Treatment Lowers Contact angle, 90 90 22°° w/o MOPA w/o MOPA vsvs 65 65 44°° w/ MOPAw/ MOPA
•• Background Buffer pH Adjusted to 8 Background Buffer pH Adjusted to 8 While Keeping Conductivity LowWhile Keeping Conductivity Low
•• Compatible with TWEEN used in Compatible with TWEEN used in Aerosol Sample CollectorAerosol Sample Collector
O
O
8
OOH
OO
OR
OH
+ + NaIO4
MOPA (Methoxy polyethylene glycol acrylates)
“Chip polymer” Functionalized “chip polymer”
WithMOPA
Without MOPA
9
Waste ManifoldWaste Manifold
System Layout and ArchitectureSystem Layout and Architecture
Aerosol CollectorAerosol Collector Test SampleTest Sample
iDEPiDEP ChipChipBackground BufferBackground Buffer
10
Robust Automated Robust Automated iDEPiDEP SystemSystem
•• Designed a Robust System Capable of Operating in the FieldDesigned a Robust System Capable of Operating in the Field•• Both Software & Hardware were Simplified and Optimized with Both Software & Hardware were Simplified and Optimized with
Reliability and Safety in MindReliability and Safety in Mind•• Prototype Field Test Unit Fabricated, Integrated and TestedPrototype Field Test Unit Fabricated, Integrated and Tested
Modular iDEP chip holder
11
Commercial microfluidic connectors
Robust Automated Robust Automated iDEPiDEP SystemSystem
•• Designed a Robust System Capable of Operating in the FieldDesigned a Robust System Capable of Operating in the Field•• Both Software & Hardware were Simplified and Optimized with Both Software & Hardware were Simplified and Optimized with
Reliability and Safety in MindReliability and Safety in Mind•• Prototype Field Test Unit Fabricated, Integrated and TestedPrototype Field Test Unit Fabricated, Integrated and Tested
12
Electronics, HVS, and aerosol collector integrated
Robust Automated Robust Automated iDEPiDEP SystemSystem
•• Designed a Robust System Capable of Operating in the FieldDesigned a Robust System Capable of Operating in the Field•• Both Software & Hardware were Simplified and Optimized with Both Software & Hardware were Simplified and Optimized with
Reliability and Safety in MindReliability and Safety in Mind•• Prototype Field Test Unit Fabricated, Integrated and TestedPrototype Field Test Unit Fabricated, Integrated and Tested
13
Rack mountable packaging
Robust Automated Robust Automated iDEPiDEP SystemSystem
•• Designed a Robust System Capable of Operating in the FieldDesigned a Robust System Capable of Operating in the Field•• Both Software & Hardware were Simplified and Optimized with Both Software & Hardware were Simplified and Optimized with
Reliability and Safety in MindReliability and Safety in Mind•• Prototype Field Test Unit Fabricated, Integrated and TestedPrototype Field Test Unit Fabricated, Integrated and Tested
14
Dedicated control and data logging software
Robust Automated Robust Automated iDEPiDEP SystemSystem
•• Designed a Robust System Capable of Operating in the FieldDesigned a Robust System Capable of Operating in the Field•• Both Software & Hardware were Simplified and Optimized with Both Software & Hardware were Simplified and Optimized with
Reliability and Safety in MindReliability and Safety in Mind•• Prototype Field Test Unit Fabricated, Integrated and TestedPrototype Field Test Unit Fabricated, Integrated and Tested
15
Sample Automated Sample Automated iDEPiDEP RunRun
Free Flow (0 V)Free Flow (0 V) Trapping (1600 V)Trapping (1600 V) Release (0 V)Release (0 V)Time
Fluorescently labeled2 μm polymer beads
(106 particles/ml)
-
+
16
Fluorescence Detector is Immune to Fluorescence Detector is Immune to iDEPiDEP ArtifactsArtifacts
•• OffOff--chip, Capillarychip, Capillary--based based Conductivity and Absorbance Conductivity and Absorbance Detectors are Affected by Detectors are Affected by iDEPiDEP--trapping Related Artifactstrapping Related Artifacts
•• Fluorescence Detection not Fluorescence Detection not Affected by Artifacts. OnAffected by Artifacts. On--chip chip Fluorescence Detection Senses:Fluorescence Detection Senses:
•• Trapping & concentration between Trapping & concentration between postsposts
•• Trapped particles shortly after Trapped particles shortly after trapping voltage is turned ontrapping voltage is turned on
•• System response in secondsSystem response in seconds•• Biological particles by detecting Biological particles by detecting
native fluorescencenative fluorescence
•• Chip Holder Design Becomes Chip Holder Design Becomes ComplexComplex
Fluorescently Labeled Polymer Beads(106 particles/ml)
Fluorescence Analysis Areas
Fluorescence Imaging
20 40 60 80 100Time(sec)
Trap
ping
Vol
tage
(v
Fluo
resc
ence
(au
Trapping VoltageFluorescence
17
OffOff--Chip Capillary Based Fluorescence DetectorChip Capillary Based Fluorescence Detector
•• These LIF Detectors Have Been Used for Many These LIF Detectors Have Been Used for Many Years Both in the Lab and in the Field at Years Both in the Lab and in the Field at Various LocationsVarious Locations
•• The Detector Units were Developed to The Detector Units were Developed to bebe Miniature, Rugged, &Miniature, Rugged, & Consume Little PowerConsume Little Power
•• They Measure Approximately 2.5 X 3 X 2 in, They Measure Approximately 2.5 X 3 X 2 in, requirerequire 5.3 volts, < 100 milliamps, Excluding 5.3 volts, < 100 milliamps, Excluding the Laser Sourcethe Laser Source
•• Detector has been used with 405, 488, 532, 635, Detector has been used with 405, 488, 532, 635, and 650 nm Excitation Sources and 650 nm Excitation Sources
Off-Chip Miniaturized Laser Induced Fluorescence Detector Unit
Renzi, R. et al, Anal. Chem., 2005, 77(2), pp 435–441
Embedded Capillary Fluorescence Provides Real-Time DetectionEmbedded Capillary Fluorescence Provides Real-Time Detection
18
0 50 100 150 200 250 300 350 400Time (sec)
Trap
ping
Vol
tage
(v)
Ave
rage
Cou
nts
Per
Sec
ond
Trapping VoltageAvg CPS
0 50 100 150 200 250 300 350 400Time (sec)
Trap
ping
Vol
tage
(v)
Ave
rage
Cou
nts
Per
Sec
ond
Trapping Voltage
Avg CPS
Fluorescence Indicates Trapping and ReleaseFluorescence Indicates Trapping and Release
•• No Redesign of Chip Holder Needed No Redesign of Chip Holder Needed •• Fluorescence CPS Changes as Soon as Trapping StartsFluorescence CPS Changes as Soon as Trapping Starts•• Trapping is Seen a Minute after Voltage is Applied Trapping is Seen a Minute after Voltage is Applied vsvs Concentration!Concentration!•• A Slight Delay is Introduced by Locating Sensor OffA Slight Delay is Introduced by Locating Sensor Off--chip chip
Fluorescently Labeled Polymer Beads(106 particles/ml)
Fluorescently Labeled Bacillus atrophaeus(106 particles/ml)
Trapping Trapping
19
SummarySummary
•• iDEPiDEP Has Several Features and Can:Has Several Features and Can:–– Selectively trap and concentrate particlesSelectively trap and concentrate particles–– Be used as a trigger in a cost effective, fast Be used as a trigger in a cost effective, fast biodetectorbiodetector
•• Automated, Prototype Automated, Prototype iDEPiDEP Field Unit has been Built, Field Unit has been Built, Integrated and TestedIntegrated and Tested
•• Embedded Fluorescence Detection has been shown to Embedded Fluorescence Detection has been shown to Sense Trapping and Concentration in < 1 minute After Sense Trapping and Concentration in < 1 minute After Applying Applying iDEPiDEP VoltageVoltage
20
Questions?Questions?
AcknowledgmentsAcknowledgments
Sandia National Labs:Sandia National Labs:•• Tim Tim ShepoddShepodd•• Josh WhaleyJosh Whaley•• Mark D. ZimmermanMark D. Zimmerman•• Benjamin Van Benjamin Van BlariganBlarigan•• Karen L. Karen L. KrafcikKrafcik•• April April NissenNissen•• Joanne Joanne VolponiVolponi•• Ron Ron RenziRenzi•• Nicholas Nicholas MascarenhasMascarenhas
Previous SNL and LMC fundingPrevious SNL and LMC funding
Lockheed Martin:Lockheed Martin:•• TyesiaTyesia PompeyPompey•• Stephanie GrovesStephanie Groves•• Frank Frank RotondoRotondo•• Robert Robert DD’’ItaliaItalia