1
|
Dong C, Li F, Sun Y, Long D, Chen C, Li M, Wei T, Martins RP, Chen T, Mak PI. A syndromic diagnostic assay on a macrochannel-to-digital microfluidic platform for automatic identification of multiple respiratory pathogens. LAB ON A CHIP 2024; 24:3850-3862. [PMID: 37961846 DOI: 10.1039/d3lc00728f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
The worldwide COVID-19 pandemic has changed people's lives and the diagnostic landscape. The nucleic acid amplification test (NAT) as the gold standard for SARS-CoV-2 detection has been applied in containing its transmission. However, there remains a lack of an affordable on-site detection system at resource-limited areas. In this study, a low cost "sample-in-answer-out" system incorporating nucleic acid extraction, purification, and amplification was developed on a single macrochannel-to-digital microfluidic chip. The macrochannel fluidic subsystem worked as a world-to-chip interface receiving 500-1000 μL raw samples, which then underwent bead-based extraction and purification processes before being delivered to DMF. Electrodes actuate an eluent dispensed to eight independent droplets for reverse transcription quantitative polymerase chain reaction (RT-qPCR). By reading with 4 florescence channels, the system can accommodate a maximum of 32 detection targets. To evaluate the proposed platform, a comprehensive assessment was conducted on the microfluidic chip as well as its functional components (i.e., extraction and amplification). The platform demonstrated a superior performance. In particular, using clinical specimens, the chip targeting SARS-CoV-2 and Flu A/B exhibited 100% agreement with off-chip diagnoses. Furthermore, the fabrication of chips is ready for scaled-up manufacturing and they are cost-effective for disposable use since they are assembled using a printed circuit board (PCB) and prefabricated blocks. Overall, the macrochannel-to-digital microfluidic platform coincides with the requirements of point-of-care testing (POCT) because of its advantages: low-cost, ease of use, comparable sensitivity and specificity, and availability for mass production.
Collapse
Affiliation(s)
- Cheng Dong
- School of Intelligent Systems Science and Engineering/JNU-Industry School of Artificial Intelligence, Jinan University, Zhuhai 519000, China
| | - Fei Li
- Department of Biomedical Engineering, Jinan University, Guangzhou, 510632, China
- Digifluidic Biotech Ltd., Zhuhai 519000, China.
| | - Yun Sun
- Digifluidic Biotech Ltd., Zhuhai 519000, China.
| | - Dongling Long
- Zhuhai Center for Disease Control and Prevention, Zhuhai 519087, China
| | - Chunzhao Chen
- Advanced Interdisciplinary Institute of Environment and Ecology, Beijing Normal University, Zhu Hai 519087, China
| | - Mengyan Li
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, 07102, USA
| | - Tao Wei
- Department of Bioengineering, College of Food Science, South China Agricultural University, Guangzhou, 510640, China
- Pan Asia (Jiangmen) Institute of Biological Engineering and Health, Jiangmen, 529080, China
| | - Rui P Martins
- State-Key Laboratory of Analog and Mixed-Signal VLSI, Institute of Microelectronics, University of Macau, Taipa, Macau SAR, 999078, China.
| | | | - Pui-In Mak
- State-Key Laboratory of Analog and Mixed-Signal VLSI, Institute of Microelectronics, University of Macau, Taipa, Macau SAR, 999078, China.
- Faculty of Science and Technology, University of Macau, Taipa, Macau SAR, 999078, China
| |
Collapse
|
2
|
Shen R, Lv A, Yi S, Wang P, Mak PI, Martins RP, Jia Y. Nucleic acid analysis on electrowetting-based digital microfluidics. Trends Analyt Chem 2022. [DOI: 10.1016/j.trac.2022.116826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
3
|
Lin X, Fang M, Yi C, Jiang Y, Zhang C, Pan X, Luo Z. Functional hydrogel for fast, precise and inhibition-free point-of-care bacteria analysis in crude food samples. Biomaterials 2021; 280:121278. [PMID: 34871876 DOI: 10.1016/j.biomaterials.2021.121278] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 10/30/2021] [Accepted: 11/23/2021] [Indexed: 11/02/2022]
Abstract
In this work, instead of performing nucleic acid amplification in the bulk solution, we report a nanoporous hydrogel with controlled release function for rapid, precise, and inhibition-free nucleic acid analysis in crude food samples. The cross-linked PEG hydrogel with nanoporous structures possesses adsorption, release, separation, restriction and self-cleaning abilities. When digital loop-mediated isothermal amplification (LAMP) was performed inside this hydrogel, the surrounding nanostructure act as a temporary reservoir for reagents storage and release them on demand during or after amplification. Meanwhile, the restricted nanoconfined environment of hydrogel also favor the enzymatic amplification process. Thus, an enhanced signal readout, robust anti-inhibition, faster amplification rate, more products yields and specific amplification without primer-dimers were obtained. Moreover, direct amplification in untreated complex food sample was successfully performed inside hydrogel without any sample pretreatment, while conventional droplets digital LAMP failed for detection. Absolute quantification of Escherichia coli and Salmonella typhi directly in fresh fruit and vegetables was achieved within 20 min, with high precision and sensitivity down to single cell. This novel lab-on-hydrogel concept has an enormous potential for future molecular diagnostic assays, and can be also applied for other point-of-care assays.
Collapse
Affiliation(s)
- Xingyu Lin
- College of Biosystems Engineering and Food Science, Fuli Institute of Food Science, Zhejiang University, Hangzhou, 310058, PR China.
| | - Mei Fang
- College of Biosystems Engineering and Food Science, Fuli Institute of Food Science, Zhejiang University, Hangzhou, 310058, PR China; College of Environment, Zhejiang University of Technology, Hangzhou, 310014, PR China
| | - Changyu Yi
- College of Biosystems Engineering and Food Science, Fuli Institute of Food Science, Zhejiang University, Hangzhou, 310058, PR China; College of Environment, Zhejiang University of Technology, Hangzhou, 310014, PR China
| | - Yan Jiang
- Chemistry Instrumentation Center, Department of Chemistry, Zhejiang University, Hangzhou, 310027, China
| | - Chao Zhang
- College of Biosystems Engineering and Food Science, Fuli Institute of Food Science, Zhejiang University, Hangzhou, 310058, PR China
| | - Xiangliang Pan
- College of Environment, Zhejiang University of Technology, Hangzhou, 310014, PR China
| | - Zisheng Luo
- College of Biosystems Engineering and Food Science, Fuli Institute of Food Science, Zhejiang University, Hangzhou, 310058, PR China
| |
Collapse
|