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Qin Y, Kreutz JE, Schneider T, Yen GS, Shah ES, Wu L, Chiu DT. A reinforced PDMS mold for hot embossing of cyclic olefin polymer in the fabrication of microfluidic chips. LAB ON A CHIP 2022; 22:4729-4734. [PMID: 36367074 PMCID: PMC9691590 DOI: 10.1039/d2lc00857b] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Hot embossing is a cost-effective and flexible fabrication technology with high replication accuracy for feature sizes as small as 50 nm. Here we develop a reinforced polydimethylsiloxane (PDMS) mold for hot embossing of cyclic olefin polymer (COP) sheets in the fabrication of microfluidic chips and demonstrate the method by fabricating chips for automated sample digitization in digital nucleic acid assays. The PDMS is hardened by adding an investment powder as a dopant and is constrained with an aluminum frame to prevent lateral expansion during hot pressing. The reinforced PDMS mold demonstrated excellent performance in hot embossing (180 °C, 103 kPa, 5 min) for micropatterning COP sheets, with highly reproducible features as small as 10 μm (width of draining channel). In contrast, the microscale features were inconsistent and distorted when omitting either the investment powder or frame from the PDMS mold. COP chips were assembled by thermally bonding patterned and unpatterned COP sheets. We tested the performance of the COP chip for automated sample digitization in a digital LAMP assay used to quantify human papillomavirus-18 (HPV-18) DNA. A mixture of nucleic acid amplification reagents was loaded into the main channel of the chip using a syringe pump, then the solution was spontaneously partitioned into chambers (∼0.6 nL), which were then isolated by flowing oil through the chip. The digital LAMP assay produced accurately absolute quantitation of DNA at concentrations ranging from 10 to 1000 copies per μL. The strategy presented here provides a simple, low-cost method to prepare molds for hot embossing, which facilitates rapid validation of microfluidic designs.
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Affiliation(s)
- Yuling Qin
- School of Public Health, Nantong University, Nantong, Jiangsu 226019, P. R. China.
| | - Jason E Kreutz
- Department of Chemistry and Bioengineering, University of Washington, Seattle, Washington 98195, USA.
| | - Thomas Schneider
- Department of Chemistry and Bioengineering, University of Washington, Seattle, Washington 98195, USA.
| | - Gloria S Yen
- Department of Chemistry and Bioengineering, University of Washington, Seattle, Washington 98195, USA.
| | - Eleanor S Shah
- Department of Chemistry and Bioengineering, University of Washington, Seattle, Washington 98195, USA.
| | - Li Wu
- School of Public Health, Nantong University, Nantong, Jiangsu 226019, P. R. China.
| | - Daniel T Chiu
- Department of Chemistry and Bioengineering, University of Washington, Seattle, Washington 98195, USA.
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Miao P, Chai H, Tang Y. DNA Hairpins and Dumbbell-Wheel Transitions Amplified Walking Nanomachine for Ultrasensitive Nucleic Acid Detection. ACS NANO 2022; 16:4726-4733. [PMID: 35188755 DOI: 10.1021/acsnano.1c11582] [Citation(s) in RCA: 52] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Nucleic acids, including circulating tumor DNA (ctDNA), microRNA, and virus DNA/RNA, have been widely applied as potential disease biomarkers for early clinical diagnosis. In this study, we present a concept of DNA nanostructures transitions for the construction of DNA bipedal walking nanomachine, which integrates dual signal amplification for direct nucleic acid assay. DNA hairpins transition is developed to facilitate the generation of multiple target sequences; meanwhile, the subsequent DNA dumbbell-wheel transition is controlled to achieve the bipedal walker, which cleaves multiple tracks around electrode surface. Through combination of strand displacement reaction and digestion cycles, DNA monolayer at the electrode interface could be engineered and target-induced signal variation is realized. In addition, pH-assisted detachable intermolecular DNA triplex design is utilized for the regeneration of electrochemical biosensor. The high consistency between this work and standard quantitative polymerase chain reaction is validated. Moreover, the feasibilities of this biosensor to detect ctDNA and SARS-CoV-2 RNA in clinical samples are demonstrated with satisfactory accuracy and reliability. Therefore, the proposed approach has great potential applications for nucleic acid based clinical diagnostics.
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Affiliation(s)
- Peng Miao
- University of Science and Technology of China, Hefei 230026, China
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, People's Republic of China
| | - Hua Chai
- University of Science and Technology of China, Hefei 230026, China
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, People's Republic of China
| | - Yuguo Tang
- University of Science and Technology of China, Hefei 230026, China
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Jiang Y, Li S, Zhu P, Zhao J, Xiong X, Wu Y, Zhang X, Li Y, Song T, Xiao W, Wang Z, Han J. Electrochemical DNA Biosensors Based on the Intrinsic Topological Insulator BiSbTeSe 2 for Potential Application in HIV Determination. ACS APPLIED BIO MATERIALS 2022; 5:1084-1091. [PMID: 35157417 DOI: 10.1021/acsabm.1c01153] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
In this work, we reported a sensitive, label-free electrochemical biosensor based on the intrinsic topological insulator (TI) BiSbTeSe2 for potential application in the determination of the HIV gene. With strong spin-obit coupling, TIs could have robust surface states with low electronic noise, which might be beneficial for the stable and sensitive electron transport between the electrode and electrolyte interface. Under optimized conditions of the biosensors using BiSbTeSe2, the differential pulse voltammetry (DPV) peak currents showed a linear relationship with the logarithm of target DNA concentrations ranging from 1.0 × 10-13 to 1.0 × 10-7 M, with a detection limit of 1.07 × 10-15 M. The sensing assay also displayed good selectivity and stability after storage at 4 °C for 7 days. This work provides an effective way to develop biosensors with topological materials, which have a potential application in the clinical determination and monitoring field.
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Affiliation(s)
- Yujiu Jiang
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China.,Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing 314019, China.,Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China
| | - Shanshan Li
- Department of Rheumatology, China-Japan Friendship Hospital, 100029 Beijing, China
| | - Peng Zhu
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China.,Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing 314019, China.,Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China
| | - Jinge Zhao
- Key Laboratory of Medical Molecule Science and Pharmaceutics Engineering, Ministry of Industry and Information Technology, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Xiaolu Xiong
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China.,Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China
| | - Yetong Wu
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China.,Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing 314019, China.,Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China
| | - Xu Zhang
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China.,Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing 314019, China.,Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China
| | - Yongkai Li
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China.,Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing 314019, China.,Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China
| | - Tinglu Song
- Experimental Centre of Advanced Materials School of Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Wende Xiao
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China.,Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China
| | - Zhiwei Wang
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China.,Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing 314019, China.,Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China
| | - Junfeng Han
- Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China.,Yangtze Delta Region Academy of Beijing Institute of Technology, Jiaxing 314019, China.,Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems, School of Physics, Beijing Institute of Technology, Beijing 100081, China
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