Upload
others
View
1
Download
0
Embed Size (px)
Citation preview
Joshua Probert, Scott D. Soelberg, Peter Kaufmann
and Clement E. Furlong
Departments of Medicine (Div. Medical Genetics) & Genome Sciences, University of Washington
CPAC Summer Institute,
July 21, 2011
Portable Surface Plasmon Resonance
Instrumentation for Rapid, Versatile
Biodetection
PROBLEM: CHEMICAL AND BIOLOGICAL HAZARDS A Growing Challenge to Public Safety
2
Food supply
Terrorism
Environment
The Challenge – Detection of Molecular Hazards
Anthrax
Melamine
Shiga Toxin
E. coli
4
The Challenge – Fast Detection in the Field
Salmonella
Ricin
E. coli
Paralytic & Amnesiac Toxin
Anthrax
0
0.2
0.4
0.6
0.8
1
0 20 40 60 80
Angle (pixel number)
Lig
ht
Inte
ns
ity
θ
-50
150
350
550
750
0 5 10 15Time (min)
RIU
x 1
0E
-6
System Software
Fundamentals of
Surface Plasmon Resonance
• Reduced Fluidics Size
• Compact, lightweight (lunchbox size, 6 lb.)
• Up to 24 simultaneous measurements for military, food industry, medical and other applications
• Low power (5W) allows portable operation with rechargeable battery
• Semi-Automated, Self Contained Storage and Readout
• Touchscreen Interface For Control and Simple Data Display
• Flow cell interfaces with TEC (±0.01 C)
Current laboratory platform
Portable Multi-channel SPR System
MBARI AUV
Old and New Fluidics
Reduced Fluidics Footprint
Reduced Electronics Footprint
Current Interface
New Interface (Mock-Up)
GO
Magnetic Nanoparticles
• Magnetic 40 nm
nanoparticles improve sensitivity by concentrating, purifying, and amplifying the signal.
• Effective for detection of low levels of Proteins, Small Molecules, Bacteria/viruses and larger (competition) in complex media
400 nm
probing
distance*
Gold (SPR) Surface
Flow Area
Magnetic Nanoparticles Amplify the SPR signal
Stepwise Detection of Staphylococcus enterotoxin B
(SEB)
1 Sensor
Ready 2 3
1
10
100
1000
10000
0 10 20 30 40 50 60
Time (min)
Rela
tive R
IU
10 ng/ml SEB (13 RIU)
50 ug/ml biotinylated
anti-SEB monoclonal
(24 RIU)
Streptavidin
nanobeads (1075 RIU)
1
3
2
C NO C
NC
B
NO
C NC
A NO C
NC
Buffer Waste
Sensors
Sample +
Nanobead
Mixture
Magnetic Separation
Column
Pump
1) Load Sample
2) Buffer Wash
(Magnet On)
3) Flow to Sensors
(Magnet Off)
Fluidic Diagram for Automated IMS
Separation and Analyte Detection
U
Servo Motor Controlled Magnet
Magnet OFF Magnet ON
ANALYTE ATTACHED TO THE SURFACE
•Small Analytes:
•Estriol, Cortisol, Domoate…
•Same analyte on the surface
Detection of small molecules by SPR
requires an indirect Competition Assay
NO ANALYTE PRESENT
Time
Re
sponse
Competition Assay
ANALYTE PRESENT
Time
Re
sponse
Competition Assay
ELISA vs. SPR
0.00%
20.00%
40.00%
60.00%
80.00%
100.00%
120.00%
0.25 2.5 25 250
SPR ELISA
Domoate Assay
-20
0
20
40
60
80
100
120
140
0 2 4 6 8 10 12 14
0ng
1ng
10ng
100ng
1000ng
Bulk
Shift
Binding
Area of
Analysis
Examples of Assays Performed with SPR
• Whole microbial cells -(F.tularensis, E. coli, Y. pestis)
• Spores -(e.g., anthrax)
• Viruses with or without amplification -(e.g. Norwalk, flu)
• Proteins by direct detection or with amplification/verification -(protein toxins, industrial proteins, therapeutics)
• Small molecular weight analytes using displacement or competition assays -(e.g., domoic acid, cortisol, insecticides, toxic chemicals, TNT & other small organics)
SPR will detect any ligand in sufficient concentration to which a binding partner (usually antibody) has been obtained, i.e.:
-50
0
50
100
150
200
0 20 40 60 80 100 120 140 160 180Time (min)
RIU
Y. pestis
106 CFU/ml
SEB 5
ng/ml
F. tularensis
5 x 103
CFU/ml
B. anthracis
5 x 106
CFU/ml
Norwalk VLPs
5 x 109
particles/ml
Ricin A
chain 20
ng/ml
BG Spores
9 x 104 CFU/ml
Ovalbumin
10 ng/ml
Multiplex Measurement Capability:
Sequential Detection of 8 Analytes
Ongoing Collaborations
• Dr. Laurie Connell, University of Maine-PNA (peptide nucleic acid) probes for detection of Alexandrium (red tide) mRNA for species identification.
• Dr. Jian Payandeh in Professor William Catterall lab, UW – defining the molecular interactions between sodium channels and their toxin inhibitors.
MBARI
http://www.mbari.org/AUV
The UW-Furlong Group
• Professor
Dr. Clement Furlong
• Sensor Team
Scott Soelberg
Peter Kaufmann
Joshua Probert
• Biomarker/PON Team Rebecca Richter Dr. Toby Cole Stephanie Suzuki Dr. Rick Stevens
• Sponsors:
Center for Process Analytical Chemistry (CPAC), UW, Seattle DOD Texas Instruments Washington State Sea Grant NSF/NIEHS NW Center for Human Health and Ocean Studies