Observations of tunable resistive pulse sensing for exosome analysis: improving system sensitivity and stability

Anderson, Will, Lane, Rebecca, Korbie, Darren and Trau, Matt (2015) Observations of tunable resistive pulse sensing for exosome analysis: improving system sensitivity and stability. Langmuir, 31 23: 6577-6587. doi:10.1021/acs.langmuir.5b01402


Author Anderson, Will
Lane, Rebecca
Korbie, Darren
Trau, Matt
Title Observations of tunable resistive pulse sensing for exosome analysis: improving system sensitivity and stability
Journal name Langmuir   Check publisher's open access policy
ISSN 1520-5827
0743-7463
Publication date 2015-06-16
Sub-type Article (original research)
DOI 10.1021/acs.langmuir.5b01402
Volume 31
Issue 23
Start page 6577
End page 6587
Total pages 11
Place of publication Washington, DC, United States
Publisher American Chemical Society
Collection year 2016
Language eng
Abstract Size distribution and concentration measurements of exosomes are essential when investigating their cellular function and uptake. Recently, a particle size distribution and concentration measurement platform known as tunable resistive pulse sensing (TRPS) has seen increased use for the characterization of exosome samples. TRPS measures the brief increase in electrical resistance (a resistive pulse) produced by individual submicrometer/nanoscale particles as they translocate through a size-tunable submicrometer/micrometer-sized pore, embedded in an elastic membrane. Unfortunately, TRPS measurements are susceptible to issues surrounding system stability, where the pore can become blocked by particles, and sensitivity issues, where particles are too small to be detected against the background noise of the system. Herein, we provide a comprehensive analysis of the parameters involved in TRPS exosome measurements and demonstrate the ability to improve system sensitivity and stability by the optimization of system parameters. We also provide the first analysis of system noise, sensitivity cutoff limits, and accuracy with respect to exosome measurements and offer an explicit definition of system sensitivity that indicates the smallest particle diameter that can be detected within the noise of the trans-membrane current. A comparison of exosome size measurements from both TRPS and cryo-electron microscopy is also provided, finding that a significant number of smaller exosomes fell below the detection limit of the TRPS platform and offering one potential insight as to why there is such large variability in the exosome size distribution reported in the literature. We believe the observations reported here may assist others in improving TRPS measurements for exosome samples and other submicrometer biological and nonbiological particles.
Keyword System stability
Particle size analysis
Spectroscopic analysis
Non-biological particles
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
School of Chemistry and Molecular Biosciences
UQ Diamantina Institute Publications
 
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