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Ding B, Hong XY, Yin H, Xu JY, Zhang XY, Zhou Q, Shen Y. Detection and Separation of DNA and Silver Nanoparticles Using a Solid-State Nanopore. ACS OMEGA 2023; 8:17682-17688. [PMID: 37251189 PMCID: PMC10210173 DOI: 10.1021/acsomega.3c00152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Accepted: 04/27/2023] [Indexed: 05/31/2023]
Abstract
Nanopore sensors, a new generation of single-molecule sensors, are increasingly used to detect and analyze various analytes and have great potential for rapid gene sequencing. However, there are still some problems in the preparation of small diameter nanopores, such as imprecise pore size and porous defects, while the detection accuracy of large-diameter nanopores is relatively low. Therefore, how to achieve more precise detection of large diameter nanopore sensors is an urgent problem to be studied. Here, SiN nanopore sensors were used to detect DNA molecules and silver nanoparticles (NPs) separately and in combination. The experimental results show that large-size solid-state nanopore sensors can identify and discriminate between DNA molecules, NPs, and NP-bound DNA molecules clearly according to resistive pulses. In addition, the detection mechanism of using NPs to assist in identifying target DNA molecules in this study is different from previous reports. We find that silver NPs can simultaneously bind to multiple probes and target DNA molecules and generate a larger blocking current than free DNA molecules when passing through the nanopore. In conclusion, our research indicates that large-sized nanopores can distinguish the translocation events, thereby identifying the presence of the target DNA molecules in the sample. This nanopore-sensing platform can produce rapid and accurate nucleic acid detection. Its application in medical diagnosis, gene therapy, virus identification, and many other fields is highly significant.
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Affiliation(s)
- Bo Ding
- Department
of Obstetrics and Gynecology, School of Medicine, Zhongda Hospital, Southeast University, Nanjing, Jiangsu 210009, China
| | - Xin-Yi Hong
- Department
of Obstetrics and Gynecology, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, China
| | - Han Yin
- Department
of Obstetrics and Gynecology, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, China
| | - Jing-Yun Xu
- Department
of Obstetrics and Gynecology, School of Medicine, Zhongda Hospital, Southeast University, Nanjing, Jiangsu 210009, China
| | - Xiao-Yu Zhang
- Department
of Obstetrics and Gynecology, School of Medicine, Zhongda Hospital, Southeast University, Nanjing, Jiangsu 210009, China
| | - Qing Zhou
- Department
of Obstetrics and Gynecology, School of Medicine, Southeast University, Nanjing, Jiangsu 210009, China
| | - Yang Shen
- Department
of Obstetrics and Gynecology, School of Medicine, Zhongda Hospital, Southeast University, Nanjing, Jiangsu 210009, China
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2
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Multi-frequency impedance sensing for detection and sizing of DNA fragments. Sci Rep 2021; 11:6490. [PMID: 33753781 PMCID: PMC7985362 DOI: 10.1038/s41598-021-85755-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Accepted: 01/11/2021] [Indexed: 01/31/2023] Open
Abstract
Electronic biosensors for DNA detection typically utilize immobilized oligonucleotide probes on a signal transducer, which outputs an electronic signal when target molecules bind to probes. However, limitation in probe selectivity and variable levels of non-target material in complex biological samples can lead to nonspecific binding and reduced sensitivity. Here we introduce the integration of 2.8 μm paramagnetic beads with DNA fragments. We apply a custom-made microfluidic chip to detect DNA molecules bound to beads by measuring Impedance Peak Response (IPR) at multiple frequencies. Technical and analytical performance was evaluated using beads containing purified Polymerase Chain Reaction (PCR) products of different lengths (157, 300, 613 bp) with DNA concentration ranging from 0.039 amol to 7.8 fmol. Multi-frequency IPR correlated positively with DNA amounts and was used to calculate a DNA quantification score. The minimum DNA amount of a 300 bp fragment coupled on beads that could be robustly detected was 0.0039 fmol (1.54 fg or 4750 copies/bead). Additionally, our approach allowed distinguishing beads with similar molar concentration DNA fragments of different lengths. Using this impedance sensor, purified PCR products could be analyzed within ten minutes to determine DNA fragment length and quantity based on comparison to a known DNA standard.
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3
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Malecka K, Kaur B, Cristaldi DA, Chay CS, Mames I, Radecka H, Radecki J, Stulz E. Silver or gold? A comparison of nanoparticle modified electrochemical genosensors based on cobalt porphyrin-DNA. Bioelectrochemistry 2020; 138:107723. [PMID: 33360955 DOI: 10.1016/j.bioelechem.2020.107723] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 12/04/2020] [Accepted: 12/05/2020] [Indexed: 11/18/2022]
Abstract
We applied a cobalt-porphyrin modified DNA as electrochemical marker, which was attached to nanoparticles, to detect specific DNA sequences. We compare the performance of gold and silver NPs in oligonucleotide sensors to determine if a change in metal will lead to either higher sensitivity or different selectivity, based on the redox behaviour of silver vs. gold. Surprisingly, we find that using either gold or silver NPs yields very similar overall performance. The electrochemical measurements of both types of sensors show the same redox behaviour which is dominated by the cobalt porphyrin, indicating that the electron pathway does not include the NP, but there is direct electron transfer between the porphyrin and the electrode. Both sensors show a linear response in the range of 5 × 10-17-1 × 10-16 M; the limit of detection (LOD) is 3.8 × 10-18 M for the AuNP sensor, and 5.0 × 10-18 M for the AgNP sensor, respectively, which corresponds to the detection of about 20-50 DNA molecules in the analyte. Overall, the silver system results in a better DNA economy and using cheaper starting materials for the NPs, thus shows better cost-effectivness and could be more suitable for the mass-production of highly sensitive DNA sensors.
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Affiliation(s)
- Kamila Malecka
- Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Tuwima 10, 10-748 Olsztyn, Poland
| | - Balwinder Kaur
- Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Tuwima 10, 10-748 Olsztyn, Poland
| | - D Andrea Cristaldi
- School of Chemistry and Institute for Life Sciences, University of Southampton, Highfield, Southampton SO17 1BJ, UK
| | - Clarissa S Chay
- School of Chemistry and Institute for Life Sciences, University of Southampton, Highfield, Southampton SO17 1BJ, UK
| | - Iwona Mames
- School of Chemistry and Institute for Life Sciences, University of Southampton, Highfield, Southampton SO17 1BJ, UK
| | - Hanna Radecka
- Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Tuwima 10, 10-748 Olsztyn, Poland
| | - Jerzy Radecki
- Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Tuwima 10, 10-748 Olsztyn, Poland.
| | - Eugen Stulz
- School of Chemistry and Institute for Life Sciences, University of Southampton, Highfield, Southampton SO17 1BJ, UK.
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Zhang Y, Gu Z, Zhao J, Shao L, Kan Y. Sequence-Specific Detection of DNA Strands Using a Solid-State Nanopore Assisted by Microbeads. MICROMACHINES 2020; 11:mi11121097. [PMID: 33322605 PMCID: PMC7763196 DOI: 10.3390/mi11121097] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 12/08/2020] [Accepted: 12/10/2020] [Indexed: 01/30/2023]
Abstract
Simple, rapid, and low-cost detection of DNA with specific sequence is crucial for molecular diagnosis and therapy applications. In this research, the target DNA molecules are bonded to the streptavidin-coated microbeads, after hybridizing with biotinylated probes. A nanopore with a diameter significantly smaller than the microbeads is used to detect DNA molecules through the ionic pulse signals. Because the DNA molecules attached on the microbead should dissociate from the beads before completely passing through the pore, the signal duration time for the target DNA is two orders of magnitude longer than free DNA. Moreover, the high local concentration of target DNA molecules on the surface of microbeads leads to multiple DNA molecules translocating through the pore simultaneously, which generates pulse signals with amplitude much larger than single free DNA translocation events. Therefore, the DNA molecules with specific sequence can be easily identified by a nanopore sensor assisted by microbeads according to the ionic pulse signals.
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5
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Nucleic acid amplification free biosensors for pathogen detection. Biosens Bioelectron 2020; 153:112049. [DOI: 10.1016/j.bios.2020.112049] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 01/21/2020] [Accepted: 01/23/2020] [Indexed: 12/11/2022]
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Single-Step FRET-Based Detection of Femtomoles DNA. SENSORS 2019; 19:s19163495. [PMID: 31405068 PMCID: PMC6719117 DOI: 10.3390/s19163495] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 08/02/2019] [Accepted: 08/05/2019] [Indexed: 12/11/2022]
Abstract
Sensitive detection of nucleic acids and identification of single nucleotide polymorphism (SNP) is crucial in diagnosis of genetic diseases. Many strategies have been developed for detection and analysis of DNA, including fluorescence, electrical, optical, and mechanical methods. Recent advances in fluorescence resonance energy transfer (FRET)-based sensing have provided a new avenue for sensitive and quantitative detection of various types of biomolecules in simple, rapid, and recyclable platforms. Here, we report single-step FRET-based DNA sensors designed to work via a toehold-mediated strand displacement (TMSD) process, leading to a distinct change in the FRET efficiency upon target binding. Using single-molecule FRET (smFRET), we show that these sensors can be regenerated in situ, and they allow detection of femtomoles DNA without the need for target amplification while still using a dramatically small sample size (fewer than three orders of magnitude compared to the typical sample size of bulk fluorescence). In addition, these single-molecule sensors exhibit a dynamic range of approximately two orders of magnitude. Using one of the sensors, we demonstrate that the single-base mismatch sequence can be discriminated from a fully matched DNA target, showing a high specificity of the method. These sensors with simple and recyclable design, sensitive detection of DNA, and the ability to discriminate single-base mismatch sequences may find applications in quantitative analysis of nucleic acid biomarkers.
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Shlyapnikov YM, Malakhova EA, Shlyapnikova EA. Rapid Amplification-Free Microarray-Based Ultrasensitive Detection of DNA. Anal Chem 2019; 91:11209-11214. [DOI: 10.1021/acs.analchem.9b02149] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yuri M. Shlyapnikov
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow
Region, 142290, Russia
| | - Ekaterina A. Malakhova
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow
Region, 142290, Russia
| | - Elena A. Shlyapnikova
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, Moscow
Region, 142290, Russia
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Zhang Y, Kaynak A, Huang T, Esfandiari L. A rapid bioanalytical tool for detection of sequence-specific circular DNA and mitochondrial DNA point mutations. Anal Bioanal Chem 2019; 411:1935-1941. [PMID: 30810791 DOI: 10.1007/s00216-019-01683-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 02/04/2019] [Accepted: 02/08/2019] [Indexed: 02/05/2023]
Abstract
Mutations in mitochondrial DNA (mtDNA) have been an essential cause of numerous diseases, making their identification critically important. The majority of mtDNA screening techniques require polymerase chain reaction (PCR) amplification, enzymatic digestion, and denaturation procedures, which are laborious and costly. Herein, we developed a sensitive PCR-free electrokinetic-based sensor combined with a customized bis-peptide nucleic acid (bis-PNA) and gamma-PNA (γ-PNA) probes immobilized on beads, for the detection of mtDNA point mutations and sequence-specific supercoiled plasmid DNA at the picomolar range. The probes are capable of invading the double-stranded circular DNA and forming a stable triplex structure. Thus, this method can significantly reduce the sample preparation and omit the PCR amplification steps prior to sensing. Further, this bioanalytical tool can open up a new paradigm in clinical settings for the screening of double-stranded circular nucleic acids with a single-base mismatch specificity in a rapid and sensitive manner.
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Affiliation(s)
- Yuqian Zhang
- Department of Electrical Engineering and Computer Science, University of Cincinnati, Cincinnati, OH, 45221, USA
| | - Ahmet Kaynak
- Department of Biomedical Engineering, University of Cincinnati, Cincinnati, OH, 45221, USA
| | - Taosheng Huang
- Department of Human Genetics, Cincinnati Children's Hospital, Cincinnati, OH, 45229, USA
| | - Leyla Esfandiari
- Department of Electrical Engineering and Computer Science, University of Cincinnati, Cincinnati, OH, 45221, USA. .,Department of Biomedical Engineering, University of Cincinnati, Cincinnati, OH, 45221, USA.
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Yi X, Xia Y, Ding B, Wu L, Hu S, Wang Z, Yang M, Wang J. Dual-Channel Surface Plasmon Resonance for Quantification of ApoE Gene and Genotype Discrimination in Unamplified Genomic DNA Extracts. ACS Sens 2018; 3:2402-2407. [PMID: 30350593 DOI: 10.1021/acssensors.8b00845] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Identification of gene variation is of great importance for attaining information related to disease susceptibility. A highly sensitive and specific surface plasmon resonance (SPR) method for quantification of the apoE gene and genotype discrimination was demonstrated. The complementary sequences with the specific recognition sites of GCGC bases upon hybridization to the preimmobilized biotinylated probes could be cleaved by the restriction enzyme HhaI, while the existence of the single-base mismatch (GTGC) prevented the cleavage reaction. In both cases, the incorporation of streptavidin increased the sensitivity of the SPR assay, and the detection levels of 10 fM and 50 fM for the complementary and single-base mismatched sequences were attained, respectively. The sensing protocol is simple, label-free, and quantitative, thus avoiding the complicated polymerase chain reaction (PCR) amplification procedures. The proposed method serves as a viable means for facile and sensitive analyses of apoE genes in four unamplified genomic DNA extracts.
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Affiliation(s)
- Xinyao Yi
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, People’s Republic of China 410083
| | - Yonghong Xia
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, People’s Republic of China 410083
| | - Binrong Ding
- Department of Geriatrics, The Third Xiangya Hospital of Central South University, Changsha, Hunan, People’s Republic of China 510060
| | - Ling Wu
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, People’s Republic of China 410083
| | - Shengqiang Hu
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, People’s Republic of China 410083
| | - Zixiao Wang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, People’s Republic of China 410083
| | - Minghui Yang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, People’s Republic of China 410083
| | - Jianxiu Wang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, People’s Republic of China 410083
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Koo B, Yorita AM, Schmidt JJ, Monbouquette HG. Amplification-free, sequence-specific 16S rRNA detection at 1 aM. LAB ON A CHIP 2018; 18:2291-2299. [PMID: 29987290 DOI: 10.1039/c8lc00452h] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A nucleic acid amplification-free, optics-free platform has been demonstrated for sequence-specific detection of Escherichia coli (E. coli) 16S rRNA at 1 aM (10-18 M) against a 106-fold (1 pM) background of Pseudomonas putida (P. putida) RNA. This work was driven by the need for simple, rapid, and low cost means for species-specific bacterial detection at low concentration. Our simple, conductometric sensing device functioned by detecting blockage of a nanopore fabricated in a sub-micron-thick glass membrane. Upon sequence-specific binding of target 16S rRNA, otherwise charge-neutral, PNA oligonucleotide probe-polystyrene bead conjugates become electrophoretically mobile and are driven to the glass nanopore of lesser diameter, which is blocked, thereby generating a large, sustained and readily observable step decrease in ionic current. No false positive signals were observed with P. putida RNA when this device was configured to detect E. coli 16S rRNA. Also, when a universal PNA probe complementary to the 16S rRNA of both E. coli and P. putida was conjugated to beads, a positive response to rRNA of both bacterial species was observed. Finally, the device readily detected E. coli at 10 CFU mL-1 in a 1 mL sample, also against a million-fold background of viable P. putida. These results suggest that this new device may serve as the basis for small, portable, low power, and low-cost systems for rapid detection of specific bacterial species in clinical samples, food, and water.
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Affiliation(s)
- Bonhye Koo
- Chemical and Biomolecular Engineering Department, University of California, Los Angeles, Los Angeles, CA 90095, USA.
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11
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Zhang Y, Rana A, Stratton Y, Czyzyk-Krzeska MF, Esfandiari L. Sequence-Specific Detection of MicroRNAs Related to Clear Cell Renal Cell Carcinoma at fM Concentration by an Electroosmotically Driven Nanopore-Based Device. Anal Chem 2017; 89:9201-9208. [PMID: 28832110 DOI: 10.1021/acs.analchem.7b01944] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
MicroRNAs (miRs) are small noncoding RNAs that play a critical role in gene regulation. Recently, traces of cancer-related miRs have been identified in body fluids, which make them remarkable noninvasive biomarkers. In this study, a new nanopore-based detection scheme utilizing a borosilicate micropipette and an assay of complementary γ-peptide nucleic acid (γ-PNA) probes conjugated to polystyrene beads have been reported for the detection of miR-204 and miR-210 related to the clear cell Renal Cell Carcinoma (ccRCC). Electroosmotic flow (EOF) is induced as the driving force to transport PNA-beads harboring target miRs to the tip of the pore (sensing zone), which results in pore blockades with unique and easily distinguishable serrated shape electrical signals. The concentration detection limit is investigated to be 1 and 10 fM for miR-204 and miR-210, respectively. The EOF transport mechanism enables highly sensitive detection of molecules with low surface charge density with 97.6% detection accuracy compared to the conventional electrophoretically driven methods. Furthermore, resistive-pulse experiments are conducted to study the correlation of the particles' surface charge density with their translocation time and verify the detection principle.
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Affiliation(s)
- Yuqian Zhang
- Department of Electrical Engineering and Computing Systems, University of Cincinnati , Cincinnati, Ohio 45221, United States
| | - Ankit Rana
- Department of Electrical Engineering and Computing Systems, University of Cincinnati , Cincinnati, Ohio 45221, United States
| | - Yiwen Stratton
- Department of Cancer Biology, University of Cincinnati , Cincinnati, Ohio 45267, United States
| | - Maria F Czyzyk-Krzeska
- Department of Cancer Biology, University of Cincinnati , Cincinnati, Ohio 45267, United States.,Department of Veterans Affairs, VA Research Service , Cincinnati, Ohio 45220, United States
| | - Leyla Esfandiari
- Department of Electrical Engineering and Computing Systems, University of Cincinnati , Cincinnati, Ohio 45221, United States.,Department of Biomedical Chemical and Environmental Engineering, University of Cincinnati , Cincinnati, Ohio 45221, United States
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12
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Ghobadi M, Rana A, Esfahani ET, Esfandiari L. Quantitative estimation of electro-osmosis force on charged particles inside a borosilicate resistive-pulse sensor. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2016; 2016:4228-4231. [PMID: 28269215 DOI: 10.1109/embc.2016.7591660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Nano and micron-scale pore sensors have been widely used for biomolecular sensing application due to its sensitive, label-free and potentially cost-effective criteria. Electrophoretic and electroosmosis are major forces which play significant roles on the sensor's performance. In this work, we have developed a mathematical model based on experimental and simulation results of negatively charged particles passing through a 2μm diameter solid-state borosilicate pore under a constant applied electric field. The mathematical model has estimated the ratio of electroosmosis force to electrophoretic force on particles to be 77.5%.
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13
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Esfandiari L, Wang S, Wang S, Banda A, Lorenzini M, Kocharyan G, Monbouquette HG, Schmidt JJ. PCR-Independent Detection of Bacterial Species-Specific 16S rRNA at 10 fM by a Pore-Blockage Sensor. BIOSENSORS-BASEL 2016; 6:bios6030037. [PMID: 27455337 PMCID: PMC5039656 DOI: 10.3390/bios6030037] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 07/08/2016] [Accepted: 07/15/2016] [Indexed: 11/16/2022]
Abstract
A PCR-free, optics-free device is used for the detection of Escherichia coli (E. coli) 16S rRNA at 10 fM, which corresponds to ~100-1000 colony forming units/mL (CFU/mL) depending on cellular rRNA levels. The development of a rapid, sensitive, and cost-effective nucleic acid detection platform is sought for the detection of pathogenic microbes in food, water and body fluids. Since 16S rRNA sequences are species specific and are present at high copy number in viable cells, these nucleic acids offer an attractive target for microbial pathogen detection schemes. Here, target 16S rRNA of E. coli at 10 fM concentration was detected against a total RNA background using a conceptually simple approach based on electromechanical signal transduction, whereby a step change reduction in ionic current through a pore indicates blockage by an electrophoretically mobilized bead-peptide nucleic acid probe conjugate hybridized to target nucleic acid. We investigated the concentration detection limit for bacterial species-specific 16S rRNA at 1 pM to 1 fM and found a limit of detection of 10 fM for our device, which is consistent with our previous finding with single-stranded DNA of similar length. In addition, no false positive responses were obtained with control RNA and no false negatives with target 16S rRNA present down to the limit of detection (LOD) of 10 fM. Thus, this detection scheme shows promise for integration into portable, low-cost systems for rapid detection of pathogenic microbes in food, water and body fluids.
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Affiliation(s)
- Leyla Esfandiari
- Department of Bioengineering, University of California, Los Angeles, CA 90095, USA.
| | - Siqing Wang
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA.
| | - Siqi Wang
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, USA.
| | - Anisha Banda
- Department of Bioengineering, University of California, Los Angeles, CA 90095, USA.
| | - Michael Lorenzini
- Department of Bioengineering, University of California, Los Angeles, CA 90095, USA.
| | - Gayane Kocharyan
- Department of Bioengineering, University of California, Los Angeles, CA 90095, USA.
| | - Harold G Monbouquette
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, USA.
| | - Jacob J Schmidt
- Department of Bioengineering, University of California, Los Angeles, CA 90095, USA.
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Tian J, Cheng N, Liu Q, Xing W, Sun X. Cobalt Phosphide Nanowires: Efficient Nanostructures for Fluorescence Sensing of Biomolecules and Photocatalytic Evolution of Dihydrogen from Water under Visible Light. Angew Chem Int Ed Engl 2015; 54:5493-7. [DOI: 10.1002/anie.201501237] [Citation(s) in RCA: 199] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Indexed: 12/26/2022]
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15
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Tian J, Cheng N, Liu Q, Xing W, Sun X. Cobalt Phosphide Nanowires: Efficient Nanostructures for Fluorescence Sensing of Biomolecules and Photocatalytic Evolution of Dihydrogen from Water under Visible Light. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201501237] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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