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Cottet J, Oshodi JO, Yebouet J, Leang A, Furst AL, Buie CR. Zeta potential characterization using commercial microfluidic chips. LAB ON A CHIP 2024; 24:234-243. [PMID: 38050677 DOI: 10.1039/d3lc00825h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/06/2023]
Abstract
Surface charge is a critical feature of microbes that affects their interactions with other cells and their environment. Because bacterial surface charge is difficult to measure directly, it is typically indirectly inferred through zeta potential measurements. Existing tools to perform such characterization are either costly and ill-suited for non-spherical samples or rely on microfluidic techniques requiring expensive fabrication equipment or specialized facilities. Here, we report the application of commercially available PMMA microfluidic chips and open-source data analysis workflows for facile electrokinetic characterization of particles and cells after prior zeta potential measurement with a Zetasizer for calibration. Our workflows eliminate the need for microchannel fabrication, increase measurement reproducibility, and make zeta potential measurements more accessible. This novel methodology was tested with functionalized 1 μm and 2 μm polystyrene beads as well as Escherichia coli MG1655 strain. Measured zeta potentials for these samples were in agreement with literature values obtained by conventional measurement methods. Taken together, our data demonstrate the power of this workflow to broadly enable critical measurements of particle and bacterial zeta potential for numerous applications.
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Affiliation(s)
- Jonathan Cottet
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
| | - Josephine O Oshodi
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Jesse Yebouet
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
| | - Andrea Leang
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
| | - Ariel L Furst
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
- Center for Environmental Health Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Cullen R Buie
- Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
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2
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Devasagayam J, Bosma R, Collier CM. A velocity program using the Kanade–Lucas–Tomasi feature‐tracking algorithm with demonstration for pressure and electroosmosis conditions. Electrophoresis 2022; 43:865-878. [DOI: 10.1002/elps.202100177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2021] [Revised: 12/18/2021] [Accepted: 12/23/2021] [Indexed: 11/11/2022]
Affiliation(s)
- Jasen Devasagayam
- School of Engineering University of British Columbia Kelowna BC Canada
- School of Engineering University of Guelph Guelph ON Canada
| | - Rick Bosma
- School of Engineering University of British Columbia Kelowna BC Canada
- School of Engineering University of Guelph Guelph ON Canada
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Antunez-Vela S, Perez-Gonzalez VH, De Peña AC, Lentz CJ, Lapizco-Encinas BH. Simultaneous Determination of Linear and Nonlinear Electrophoretic Mobilities of Cells and Microparticles. Anal Chem 2020; 92:14885-14891. [DOI: 10.1021/acs.analchem.0c03525] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Sofia Antunez-Vela
- Microscale Bioseparations Laboratory and Biomedical Engineering Department, Rochester Institute of Technology, 160 Lomb Memorial Drive, Rochester, New York 14623, United States
- School of Engineering and Sciences, Tecnologico de Monterrey, Av. Eugenio Garza Sada 2501 Sur, Monterrey NL 64849, Mexico
| | - Victor H. Perez-Gonzalez
- School of Engineering and Sciences, Tecnologico de Monterrey, Av. Eugenio Garza Sada 2501 Sur, Monterrey NL 64849, Mexico
| | - Adriana Coll De Peña
- Microscale Bioseparations Laboratory and Biomedical Engineering Department, Rochester Institute of Technology, 160 Lomb Memorial Drive, Rochester, New York 14623, United States
- Thomas H. Gosnell School of Life Sciences, Rochester Institute of Technology Rochester, 160 Lomb Memorial Drive, Rochester, New York 14623, United States
| | - Cody J. Lentz
- Microscale Bioseparations Laboratory and Biomedical Engineering Department, Rochester Institute of Technology, 160 Lomb Memorial Drive, Rochester, New York 14623, United States
| | - Blanca H. Lapizco-Encinas
- Microscale Bioseparations Laboratory and Biomedical Engineering Department, Rochester Institute of Technology, 160 Lomb Memorial Drive, Rochester, New York 14623, United States
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Hill N, Lapizco-Encinas BH. Continuous flow separation of particles with insulator-based dielectrophoresis chromatography. Anal Bioanal Chem 2020; 412:3891-3902. [DOI: 10.1007/s00216-019-02308-w] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 11/15/2019] [Accepted: 11/27/2019] [Indexed: 01/10/2023]
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Weirauch L, Lorenz M, Hill N, Lapizco-Encinas BH, Baune M, Pesch GR, Thöming J. Material-selective separation of mixed microparticles via insulator-based dielectrophoresis. BIOMICROFLUIDICS 2019; 13:064112. [PMID: 31768198 PMCID: PMC6858286 DOI: 10.1063/1.5124110] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2019] [Accepted: 10/30/2019] [Indexed: 05/31/2023]
Abstract
Insulator-based dielectrophoresis (iDEP) has become a powerful tool for biomicrofluidic separation and analysis because it is capable to selectively separate biological particle systems according to properties like size, material, and shape. However, it has rarely been used to solve challenging separation problems involving nonbiological particles, namely, for systems that are prone to particle agglomeration. Here, we demonstrate material-selective separation of nonbiological systems, i.e., polystyrene and gold-coated polystyrene particles of two different sizes, using iDEP at high accuracy. For this purpose, we present a method to generate fluorescent gold-coated particles. We further introduce a method to reduce the static backpressure that builds up between in- and outlet reservoir due to electroosmotic flow. Moreover, we found that particle agglomeration makes their separation impossible when conventional iDEP routines are applied. Therefore, two solutions to reduce particle agglomeration are presented: A combination of AC and DC potentials and adjustment of pH and conductivity of the suspending medium. Both approaches allow separating particles under challenging conditions such as initially low absolute particle zeta potentials and high particle concentrations. Since those conditions can also be present in biological iDEP separation processes, the results are of general value for biological and nonbiological iDEP operations.
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Affiliation(s)
- L Weirauch
- Chemical Process Engineering (CVT), University of Bremen, Leobener Str. 6, 28359 Bremen, Germany
| | - M Lorenz
- Chemical Process Engineering (CVT), University of Bremen, Leobener Str. 6, 28359 Bremen, Germany
| | - N Hill
- Microscale Bioseparations Laboratory, Rochester Institute of Technology, Rochester, New York 14623, USA
| | - B H Lapizco-Encinas
- Microscale Bioseparations Laboratory, Rochester Institute of Technology, Rochester, New York 14623, USA
| | - M Baune
- Chemical Process Engineering (CVT), University of Bremen, Leobener Str. 6, 28359 Bremen, Germany
| | - G R Pesch
- Chemical Process Engineering (CVT), University of Bremen, Leobener Str. 6, 28359 Bremen, Germany
| | - J Thöming
- Chemical Process Engineering (CVT), University of Bremen, Leobener Str. 6, 28359 Bremen, Germany
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Hill N, Lapizco‐Encinas BH. On the use of correction factors for the mathematical modeling of insulator based dielectrophoretic devices. Electrophoresis 2019; 40:2541-2552. [DOI: 10.1002/elps.201900177] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 06/10/2019] [Accepted: 06/18/2019] [Indexed: 01/17/2023]
Affiliation(s)
- Nicole Hill
- Microscale Bioseparations Laboratory and Biomedical Engineering DepartmentRochester Institute of Technology Rochester NY USA
| | - Blanca H. Lapizco‐Encinas
- Microscale Bioseparations Laboratory and Biomedical Engineering DepartmentRochester Institute of Technology Rochester NY USA
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Lentz CJ, Hidalgo-Caballero S, Lapizco-Encinas BH. Low frequency cyclical potentials for fine tuning insulator-based dielectrophoretic separations. BIOMICROFLUIDICS 2019; 13:044114. [PMID: 31489061 PMCID: PMC6715440 DOI: 10.1063/1.5115153] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Accepted: 08/13/2019] [Indexed: 05/25/2023]
Abstract
In this study, we demonstrate the use of cyclical low frequency signals with insulator-based dielectrophoresis (iDEP) devices for the separation of particles of similar characteristics and an experimental method for estimating particle DEP mobilities. A custom signal designer program was created using Matlab® and COMSOL Multiphysics® for the identification of specific low frequency signals aimed at separating particle mixtures by exploiting slight differences in surface charge (particle zeta potential) or particle size. For the separation by surface charge, a mixture of two types of 10 μm particles was analyzed and effectively separated employing both a custom step signal and a sawtooth left signal. Notably, these particles had the same shape, size, and surface functionalization as well as were made from the same substrate material. For the separation by size, a sample containing 2 μm and 5 μm particles was successfully separated using a custom step signal; these particles had the same shape, surface functionalization, were made from the same substrate materials, and had only a small difference in zeta potential (10 mV). Additionally, an experimental technique was developed to estimate the dielectrophoretic mobility of each particle type; this information was then utilized by the signal designer program. The technique developed in this study is readily applicable for designing signals capable of separating micron-sized particles of similar characteristics, such as microorganisms, where slight differences in cell size and the shape of surface charge could be effectively exploited. These findings open the possibility for applications in microbial screening using iDEP devices.
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Affiliation(s)
- Cody J. Lentz
- Microscale Bioseparations Laboratory, Rochester Institute of Technology, Rochester, New York 14623, USA
| | | | - Blanca H. Lapizco-Encinas
- Microscale Bioseparations Laboratory, Rochester Institute of Technology, Rochester, New York 14623, USA
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