WWW.BIOMED.DREXEL.EDU/ ResearchPortfolio/ School of Biomedical Engineering, Science & Health Systems V 1.0 SD [020327] Kambiz Pourrezaei, Ph.D. Drexel University School of Biomedical Engineering, Science & Health Systems NANO-OPTICS FOR CELLULAR INVESTIGATION Focus on Microscopy 2004 University City Sheraton Philadelphia, Pennsylvania
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School of Biomedical Engineering, Science & Health Systems V 1.0 SD [020327] Kambiz Pourrezaei, Ph.D. Drexel University.
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WWW.BIOMED.DREXEL.EDU/ResearchPortfolio/
School of Biomedical Engineering, Science & Health Systems
V 1.0 SD [020327]
Kambiz Pourrezaei, Ph.D.Drexel UniversitySchool of Biomedical Engineering,Science & Health Systems
NANO-OPTICS FOR CELLULAR INVESTIGATION
Focus on Microscopy 2004
University City Sheraton
Philadelphia, Pennsylvania
WWW.BIOMED.DREXEL.EDU/ResearchPortfolio/
School of Biomedical Engineering, Science & Health Systems
V 1.0 SD [020327]
OVERVIEWOptical Nanoprobes in NSOM/Raman: Membrane and Intracellular Detection Mark Contarino, Ed Keough, Irwin Chaiken, Som Tyagi, Kambiz Pourrezaei
Surfaced Enhanced Raman Spectroscopy: Label-Free Detection using SERS Optimized Nanoprobes Vishal Kamat, Ed Keough, Mark Contarino, Elisabeth Papazoglou, Kambiz Pourrezaei, Som Tyagi
Quantum Dots: Biological Applications of Fluorescent NanoparticlesBahar Edrissi, Amir Rezvan, Mark Contarino, Johan Verjans, Chris Reutelingsperger, Jagat Narula, Som Tyagi, Elisabeth Papazoglou, Peter Lelkes
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School of Biomedical Engineering, Science & Health Systems
V 1.0 SD [020327]
Fiber Optic Nano-probe Fabrication
• By exposing the silica core, the fiber is pulled into nano probes using the P2000 Micropipette Puller.
• Fiber tips are typically 30-60nm in diameter.• Fibers are cleaned using a wet chemical dip-process.• By varying the layering method and deposition parameters, we can have
smooth & uniform gold film or uniform gold blobs on the surface of these nano probes.
P2000 Micropipette Puller
30nm Au Sputtered Using Standard Smooth Layering
E-Beam Evaporation of 100nm Au
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School of Biomedical Engineering, Science & Health Systems
V 1.0 SD [020327]
Nanonics/Renishaw combination SPM/Raman system
• Simultaneous AFM/NSOM Topographic Information
• Nanoprobe Dimensions Allow for Sub-Wavelength (< 100 nm) Investigations
School of Biomedical Engineering, Science & Health Systems
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Φ = 500 nm
λExcitation = 488nm
λEmission = 518nm
NSOM Fluorescence Imaging
Schematic of monochromatic light delivered through tapered nanoprobe aperture that excites FITC (green) labelled IgG (red) physi-adsorbed on glass slide. [concentration = 50ug/ml]
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School of Biomedical Engineering, Science & Health Systems
V 1.0 SD [020327]
Topographic Data
Simultaneous collection
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School of Biomedical Engineering, Science & Health Systems
V 1.0 SD [020327]
Fluorescence Recovery
Wavelength (nm)
Co
un
ts
Fluorescence collected of FITC-labeled anti-5-His IgG using Nanonics/ Renishaw platform under 488nm excitation through metallic coated nanoprobe (500nm aperture)
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School of Biomedical Engineering, Science & Health Systems
School of Biomedical Engineering, Science & Health Systems
V 1.0 SD [020327]
Antibody Functionalization of Silica Surface
Phase contrast and fluorescent contrast images of control fiber (left) and FITC labeled antibody functionalized fiber (right). The fluorescence in the control is due to a defect in the fiber, as seen in the phase image.
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School of Biomedical Engineering, Science & Health Systems
V 1.0 SD [020327]
Cell under inverted microscope
Collect/Count Photons
Quantify Concentration
UV light
needle-like fiber
Y Y
<150 nm
Cullum and Vo-Dihn, 2000
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School of Biomedical Engineering, Science & Health Systems
V 1.0 SD [020327]
Preliminary Cell Viability
S2 Viability w ith Trypan Blue Exclusion
0
2
4
6
8
10
12
1 2 3 4 5 6 7 8
S2 Cell Num ber
Tim
e un
til b
lue
(max
10
min
)
38 nm tip
34 nm tip
31 nm tip
48 nm tip
Trypan blue experiments with four probe diameters. After several cells were probed with the same tip, there was an observed residue buildup on the tip. After this event, subsequent probes resulted in membrane adherence to the probe, rupturing cellular integrity
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School of Biomedical Engineering, Science & Health Systems
V 1.0 SD [020327]
SERS• Surface Enhanced
Raman Spectroscopy
Metallic clusters of < 200nm have shown to enhance the normally weak Raman scattering by as much as 1010!
Apertureless probes could bring a Raman signal inside cells, fingerprinting biomolecules with a unique Raman spectra
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School of Biomedical Engineering, Science & Health Systems
V 1.0 SD [020327]
SERS Optimized Nano-Probes
• The tapered probe is coated with gold film with the fabrication of well organized gold features on the surface of the tip (shown above).
• The tip of the probe will give optimum condition for maximum enhancement of the Raman signal.
• Functionalization of the tip with target specific antibody will enable us to detect any antigen in the cell.
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School of Biomedical Engineering, Science & Health Systems
V 1.0 SD [020327]
SERS for ZnO
RED: Enhanced Raman signal from ZnO (435 cm-1) on the gold coated probe.
BLUE: Standard Raman signal for ZnO
Observed enhancement is around 100x’s
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School of Biomedical Engineering, Science & Health Systems
V 1.0 SD [020327]
SERS for Collagen - Type I
In the inset : Red Enhanced Raman Spectrum of Collagen Type I.
Violet Normal Raman Spectrum of Collagen Type I
The enhancement factor is around 50x’s.
Amine Peak
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School of Biomedical Engineering, Science & Health Systems
V 1.0 SD [020327]
Future Goals & Achievementso Fabrication of 10-20 nm Gold beads at
the tip of these nano probes to have Tip Enhanced Raman Spectroscopy (TERS).
o TERS for single cell analysis.
o Analysis of Protein Structure & its folding process using TERS.
o Determination of intracellular signaling pathways using TERS.
o Integrating Near Field Scanning Optical Microscope (NSOM) & TERS for cell analysis with 50nm resolution.
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School of Biomedical Engineering, Science & Health Systems
V 1.0 SD [020327]
Elisabeth S. Papazoglou, Bahar Edrissi, Amir Rezvan, Mark Contarino, Johan Verjans, Chris Reutelingsperger, Jagat Narula, Kambiz