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Sousa LR, Moreira NS, Guinati BGS, Coltro WKT, Cortón E, Figueredo F. Improved sensitivity in paper-based microfluidic analytical devices using a pH-responsive valve for nitrate analysis. Talanta 2024; 277:126361. [PMID: 38878509 DOI: 10.1016/j.talanta.2024.126361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2024] [Revised: 05/31/2024] [Accepted: 06/03/2024] [Indexed: 07/19/2024]
Abstract
This paper presents an innovative application of chitosan material to be used as pH-responsive valves for the precise control of lateral flow in microfluidic paper-based analytical devices (μPADs). The fabrication of μPADs involved wax printing, while pH-responsive valves were created using a solution of chitosan in acetic acid. The valve-forming solution was applied, and ready when dry; by exposure to acidic solutions, the valve opens. Remarkably, the valves exhibited excellent compatibility with alkaline, neutral, and acidic solutions with a pH higher than 4. The valve opening process had no impact on the flow rate and colorimetric analysis. The potential of chitosan valves used for flow control was demonstrated for μPADs employed for nitrate determination. Valves were used to increase the conversion time of nitrate to nitrite, which was further analyzed using the Griess reaction. The μPAD showed a linear response in the concentration range of 10-100 μmol L-1, with a detection limit of 5.4 μmol L-1. As a proof of concept, the assay was successfully applied to detect nitrate levels in water samples from artificial lakes of recreational parks. For analyses that require controlled kinetics and involve multiple sequential steps, the use of chitosan pH-responsive valves in μPADs is extremely valuable. This breakthrough holds great potential for the development of simple and high-impact microfluidic platforms that can cater to a wide range of analytical chemistry applications.
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Affiliation(s)
- Lucas R Sousa
- Departamento de Química Biológica e IQUIBICEN -CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires (UBA), CABA, Argentina; Instituto de Química, Universidade Federal de Goiás, 74690-900, Goiânia, GO, Brazil
| | - Nikaele S Moreira
- Instituto de Química, Universidade Federal de Goiás, 74690-900, Goiânia, GO, Brazil
| | - Bárbara G S Guinati
- Instituto de Química, Universidade Federal de Goiás, 74690-900, Goiânia, GO, Brazil
| | - Wendell K T Coltro
- Instituto de Química, Universidade Federal de Goiás, 74690-900, Goiânia, GO, Brazil; Instituto Nacional de Ciência e Tecnologia de Bioanalítica, 13084-971, Campinas, SP, Brazil
| | - Eduardo Cortón
- Departamento de Química Biológica e IQUIBICEN -CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires (UBA), CABA, Argentina
| | - Federico Figueredo
- Departamento de Química Biológica e IQUIBICEN -CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires (UBA), CABA, Argentina.
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2
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Soman SS, Samad SA, Venugopalan P, Kumawat N, Kumar S. Microfluidic paper analytic device (μPAD) technology for food safety applications. BIOMICROFLUIDICS 2024; 18:031501. [PMID: 38706979 PMCID: PMC11068414 DOI: 10.1063/5.0192295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Accepted: 04/15/2024] [Indexed: 05/07/2024]
Abstract
Foodborne pathogens, food adulterants, allergens, and toxic chemicals in food can cause major health hazards to humans and animals. Stringent quality control measures at all stages of food processing are required to ensure food safety. There is, therefore, a global need for affordable, reliable, and rapid tests that can be conducted at different process steps and processing sites, spanning the range from the sourcing of food to the end-product acquired by the consumer. Current laboratory-based food quality control tests are well established, but many are not suitable for rapid on-site investigations and are costly. Microfluidic paper analytical devices (μPADs) are a fast-growing field in medical diagnostics that can fill these gaps. In this review, we describe the latest developments in the applications of microfluidic paper analytic device (μPAD) technology in the food safety sector. State-of-the-art μPAD designs and fabrication methods, microfluidic assay principles, and various types of μPAD devices with food-specific applications are discussed. We have identified the prominent research and development trends and future directions for maximizing the value of microfluidic technology in the food sector and have highlighted key areas for improvement. We conclude that the μPAD technology is promising in food safety applications by using novel materials and improved methods to enhance the sensitivity and specificity of the assays, with low cost.
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Affiliation(s)
- Soja Saghar Soman
- Division of Engineering, New York University Abu Dhabi, Abu Dhabi, P.O. Box 129188, UAE
| | - Shafeek Abdul Samad
- Division of Engineering, New York University Abu Dhabi, Abu Dhabi, P.O. Box 129188, UAE
| | | | - Nityanand Kumawat
- Division of Engineering, New York University Abu Dhabi, Abu Dhabi, P.O. Box 129188, UAE
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3
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Fernández-Ramos MD, Bolaños-Bañuelos M, Capitán-Vallvey LF. Point-of-care assay platform for uric acid, urea, and triglycerides with a microfluidic paper device (μPAD) controlled by stimulus-sensitive valves. Talanta 2023; 254:124189. [PMID: 36525868 DOI: 10.1016/j.talanta.2022.124189] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 12/04/2022] [Accepted: 12/08/2022] [Indexed: 12/14/2022]
Abstract
A microfluidic biosensor paper-based analytical device, or μPAD, was developed as a point-of-care assay platform for the simultaneous determination of three clinically important markers: uric acid, urea, and triglycerides. To achieve a simultaneous determination, thermosensitive valves based on N-isopropylacrylamide polymers controlled the flow of fluid in the μPAD. The evaluation of the analytical characteristics of the μPAD was done using a photographic camera at room temperature. The detection limits were 4.5·10-5, 2.5·10-3, and 1.5·10-3 mg mL-1, for uric acid, urea, and triglycerides, respectively, and the precision expressed as relative standard deviation (% RSD) 3.2, 1.2, and 1.6%. The obtained μPAD devices were validated with real human plasma samples, demonstrating high accuracy and precision. Multiple analyte point-of-care tests such as those developed here have excellent characteristics, being easy to manufacture, cost-effective, easy to use, and highly sensitive.
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Affiliation(s)
- M D Fernández-Ramos
- ECsens. Department of Analytical Chemistry, University of Granada, Granada, 18071, Spain; Unit of Excellence in Chemistry Applied to Biomedicine and the Environment of the University of Granada, Spain.
| | - M Bolaños-Bañuelos
- ECsens. Department of Analytical Chemistry, University of Granada, Granada, 18071, Spain
| | - L F Capitán-Vallvey
- ECsens. Department of Analytical Chemistry, University of Granada, Granada, 18071, Spain; Unit of Excellence in Chemistry Applied to Biomedicine and the Environment of the University of Granada, Spain
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4
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Salinas G, Malacarne F, Bonetti G, Cirilli R, Benincori T, Arnaboldi S, Kuhn A. Wireless electromechanical enantio-responsive valves. Chirality 2023; 35:110-117. [PMID: 36513396 DOI: 10.1002/chir.23521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 11/14/2022] [Accepted: 11/15/2022] [Indexed: 12/15/2022]
Abstract
Microfluidic valves based on chemically responsive materials have gained considerable attention in recent years. Herein, a wireless enantio-responsive valve triggered by bipolar electrochemistry combined with chiral recognition is reported. A conducting polymer actuator functionalized with the enantiomers of an inherently chiral oligomer was used as bipolar valve to cover a tube loaded with a dye and immersed in a solution containing chiral analytes. When an electric field is applied, the designed actuator shows a reversible cantilever-type deflection, allowing the release of the dye from the reservoir. The tube can be opened and closed by simply switching the polarity of the system. Qualitative results show the successful release of the colorant, driven by chirality and redox reactions occurring at the bipolar valve. The device works well even in the presence of chemically different chiral analytes in the same solution. These systems open up new possibilities in the field of microfluidics, including also controlled drug delivery applications.
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Affiliation(s)
- Gerardo Salinas
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM UMR 5255, Pessac, France
| | | | - Giorgia Bonetti
- Dip. di Scienza e Alta Tecnologia, Univ. degli Studi dell'Insubria, Como, Italy
| | - Roberto Cirilli
- Istituto Superiore di Sanità, Centro Nazionale per il Controllo e la Valutazione dei Farmaci, Rome, Italy
| | - Tiziana Benincori
- Dip. di Scienza e Alta Tecnologia, Univ. degli Studi dell'Insubria, Como, Italy
| | | | - Alexander Kuhn
- Univ. Bordeaux, CNRS, Bordeaux INP, ISM UMR 5255, Pessac, France
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5
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Shen H, Li Q, Song W, Jiang X. Microfluidic on-chip valve and pump for applications in immunoassays. LAB ON A CHIP 2023; 23:341-348. [PMID: 36602133 DOI: 10.1039/d2lc01042a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
On-chip valves can simplify a microfluidic chip and make it easy to operate. However, most on-chip valves already reported still need complicated manufacture and sophisticated supporting devices. In this work, we present a straightforward on-chip valve, which can be serially connected, to form an on-chip pump. The liquid can horizontally flow one way by the regular deformations of flexure strips in the two valves at both sides of the chamber under pressure changes in microchannels generated by repeated vertical movements of linear actuators. The volume of this system including the chip and the supporting device is 0.65 cubic decimeters, which is much smaller than that of reported systems with a volume of at least 12 cubic decimeters, and the weight of this system is only 0.56 kg, making it possible for point-of-care testing. We carry out an immunoassay of folic acid on chip, and the results show satisfactory reproducibility with acceptable coefficients of variation. We determine 163 clinical human serum samples for folic acid. Furthermore, we detect transferrin, cobalamin and folic acid simultaneously on one chip with both sandwich and competitive binding immunoassay methods. We anticipate that this on-chip valve and pump can be applied in immunoassays and other biosensing applications.
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Affiliation(s)
- Haiying Shen
- National Institute of Metrology, Beijing 100029, People's Republic of China
- Guangdong Provincial Key Laboratory of Advanced Biomaterials, Shenzhen Key Laboratory of Smart Healthcare Engineering, Department of Biomedical Engineering, Southern University of Science and Technology, Guangdong 518055, People's Republic of China.
- National Center for NanoScience and Technology, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
| | - Qiliang Li
- Department of Clinical Laboratory Center, Beijing Children's Hospital, Capital Medical University, National Center for Children Health, Beijing 100045, People's Republic of China.
| | - Wenqi Song
- Department of Clinical Laboratory Center, Beijing Children's Hospital, Capital Medical University, National Center for Children Health, Beijing 100045, People's Republic of China.
| | - Xingyu Jiang
- Guangdong Provincial Key Laboratory of Advanced Biomaterials, Shenzhen Key Laboratory of Smart Healthcare Engineering, Department of Biomedical Engineering, Southern University of Science and Technology, Guangdong 518055, People's Republic of China.
- National Center for NanoScience and Technology, Chinese Academy of Sciences, Beijing 100190, People's Republic of China
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6
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Heidari-Bafroui H, Kumar A, Charbaji A, Smith W, Rahmani N, Anagnostopoulos C, Faghri M. A Parametric Study on a Paper-Based Bi-Material Cantilever Valve. MICROMACHINES 2022; 13:mi13091502. [PMID: 36144125 PMCID: PMC9506191 DOI: 10.3390/mi13091502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 09/05/2022] [Accepted: 09/08/2022] [Indexed: 06/01/2023]
Abstract
The novel paper-based Bi-Material Cantilever (B-MaC) valve allows the autonomous loading and control of multiple fluid reagents which contributes to the accurate operation of paper-based microfluidic devices utilized for biological and chemical sensing applications. In this paper, an extensive parametric study is presented to evaluate the effects of key geometric parameters of the valve, such as paper direction, cantilever width, paper type, tape type, and sample volume, in addition to the effects of relative humidity and temperature on the functionality of the B-MaC and to provide a better understanding of the rate of fluid flow and resulting deflection of the cantilever. Machine direction, cantilever width, paper type, and tape type were found to be important parameters that affect the B-MAC's activation time. It was also observed that the rate of fluid imbibition in the B-MaC is considerably affected by change in humidity for high (55 °C) and low (25 °C) temperatures, while humidity levels have no significant effect during imbibition in the B-MaC at an ambient temperature of 45 °C. It was also found that a minimum distance of 4 mm is required between the B-MaC and the stationary component to prevent accidental activation of the B-MaC prior to sample insertion when relative humidity is higher than 90% and temperature is lower than 35 °C. The rate of fluid imbibition that determines the wetted length of the B-MaC and the final deflection of the cantilever are critical in designing and fabricating point-of-care microfluidic paper-based devices. The B-MaC valve can be utilized in a fluidic circuit to sequentially load several reagents, in addition to the sample to the detection area.
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7
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The Loan Trinh K, Ri Chae W, Yoon Lee N. Recent advances in the fabrication strategies of paper-based microfluidic devices for rapid detection of bacteria and viruses. Microchem J 2022. [DOI: 10.1016/j.microc.2022.107548] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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8
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Wang E, Guo Z, Tang R, Lo YH. Using airflow-driven, evaporative gradients to improve sensitivity and fluid control in colorimetric paper-based assays. LAB ON A CHIP 2021; 21:4249-4261. [PMID: 34608465 DOI: 10.1039/d1lc00542a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Microfluidic paper-based analytical devices (μPADs) are foundational devices for point-of-care testing, yet suffer from limitations in regards to their sensitivity and capability in handling complex assays. Here, we demonstrate an airflow-based, evaporative method that is capable of manipulating fluid flows within paper membranes to offer new functionalities for multistep delivery of reagents and improve the sensitivity of μPADs by 100-1000 times. This method applies an air-jet to a pre-wetted membrane, generating an evaporative gradient such that any solutes become enriched underneath the air-jet spot. By controlling the lateral position of this spot, the solutes in the paper strip are enriched and follow the air jet trajectory, driving the reactions and enhancing visualization for colorimetric readout in multistep assays. The technique has been successfully applied to drive the sequential delivery in multistep immunoassays as well as improve sensitivity for colorimetric detection assays for nucleic acids and proteins via loop-mediated isothermal amplification (LAMP) and ELISA. For colorimetric LAMP detection of the COVID-19 genome, enrichment of the solution on paper could enhance the contrast of the dye in order to more clearly distinguish between the positive and negative results to achieve a sensitivity of 3 copies of SARS-Cov-2 RNAs. For ELISA, enrichment of the oxidized TMB substrate yielded a sensitivity increase of two-to-three orders of magnitude when compared to non-enriched samples - having a limit of detection of around 200 fM for IgG. Therefore, this enrichment method represents a simple process that can be easily integrated into existing detection assays for controlling fluid flows and improving detection of biomarkers on paper.
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Affiliation(s)
- Edward Wang
- Department of Aerospace and Mechanical Engineering, Materials Science and Engineering Program, UC-San Diego, San Diego, USA.
| | - Zhilin Guo
- Department of Aerospace and Mechanical Engineering, Materials Science and Engineering Program, UC-San Diego, San Diego, USA.
| | - Rui Tang
- Department of Electrical and Computer Engineering, UC-San Diego, San Diego, USA
| | - Yu-Hwa Lo
- Department of Aerospace and Mechanical Engineering, Materials Science and Engineering Program, UC-San Diego, San Diego, USA.
- Department of Electrical and Computer Engineering, UC-San Diego, San Diego, USA
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9
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Meng H, Chen C, Zhu Y, Li Z, Ye F, Ho JWK, Chen H. Automatic flow delay through passive wax valves for paper-based analytical devices. LAB ON A CHIP 2021; 21:4166-4176. [PMID: 34541589 DOI: 10.1039/d1lc00638j] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Microfluidic paper-based analytical devices (μPADs) have been widely explored for point-of-care testing due to their simplicity, low cost, and portability. μPADs with multiple-step reactions usually require precise flow control, especially flow-delay. This paper reports the numerical, mathematical, and experimental studies of flow delay through wax valves surrounded by PDMS walls on paper microfluidics. The predried surfactant in the sample zone diffuses into the liquid sample which can therefore flow through the wax valves. The delay time is automatically regulated by the diffusion of the surfactant after sample loading. The numerical study suggested that both the elevated contact angle and the reduced porosity and pore size in the wax printed region could effectively prevent water but allow liquids with lower contact angles (e.g., surfactant solutions) to flow through. The PDMS walls fabricated using a low-cost liquid dispenser effectively prevented the leakage of surfactant solutions. By controlling the quantity, diffusion distance, and type of the surfactant predried on the chip, the system successfully achieved a delay time ranging from 1.6 to 20 minutes. A mathematical model involving the above parameters was developed based on Fick's second law to predict the delay time. Finally, the flow-delay systems were applied in sequential mixing and distance-based detection of either glucose or alcohol. Linear ranges of 1-100 mg dL-1 and 1-40 mg dL-1 were achieved for glucose and alcohol, respectively. The lower limit detection (LOD) of glucose and alcohol was 1 mg dL-1. The LOD of glucose was only 1/11 of that detected using μPADs without flow control, indicating the advantage of controlling fluid flow. The systematic findings in this study provide critical guidelines for the development and applications of wax valves in automatic flow delay for point-of-care testing.
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Affiliation(s)
- Haixu Meng
- School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen, Shenzhen 518055, China.
| | - Chang Chen
- School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen, Shenzhen 518055, China.
- Laboratory of Physical Chemistry and Soft Matter, Wageningen University & Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
| | - Yonggang Zhu
- School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen, Shenzhen 518055, China.
| | - Zhengtu Li
- State Key Laboratory of Respiratory Diseases, Guangzhou Institute of Respiratory Health, National Clinical Centre of Respiratory Disease, The First Affiliated Hospital, Guangzhou Medical University, Guangzhou 510120, China
| | - Feng Ye
- State Key Laboratory of Respiratory Diseases, Guangzhou Institute of Respiratory Health, National Clinical Centre of Respiratory Disease, The First Affiliated Hospital, Guangzhou Medical University, Guangzhou 510120, China
| | - Joshua W K Ho
- School of Biomedical Sciences, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong, China
| | - Huaying Chen
- School of Mechanical Engineering and Automation, Harbin Institute of Technology, Shenzhen, Shenzhen 518055, China.
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10
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Lee D, Ozkaya-Ahmadov T, Chu CH, Boya M, Liu R, Sarioglu AF. Capillary flow control in lateral flow assays via delaminating timers. SCIENCE ADVANCES 2021; 7:eabf9833. [PMID: 34597143 PMCID: PMC10938491 DOI: 10.1126/sciadv.abf9833] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Accepted: 08/11/2021] [Indexed: 05/10/2023]
Abstract
Lateral flow assays (LFAs) use capillary flow of liquids for simple detection of analytes. While useful for spontaneously wicking samples, the capillary flow inherently limits performing complex reactions that require timely application of multiple solutions. Here, we introduce a technique to control capillary flow on paper by imprinting roadblocks on the flow path with water-insoluble ink and using the gradual formation of a void between a wetted paper and a sheath polymer tape to create timers. Timers are drawn at strategic nodes to hold the capillary flow for a desired period and thereby enable multiple liquids to be introduced into multistep chemical reactions following a programmed sequence. Using our technique, we developed (i) an LFA with built-in signal amplification to detect human chorionic gonadotropin with an order of magnitude higher sensitivity than the conventional assay and (ii) a device to extract DNA from bodily fluids without relying on laboratory instruments.
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Affiliation(s)
- Dohwan Lee
- School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Tevhide Ozkaya-Ahmadov
- School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Chia-Heng Chu
- School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Mert Boya
- School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Ruxiu Liu
- School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - A. Fatih Sarioglu
- School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
- Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA 30332, USA
- Institute for Electronics and Nanotechnology, Georgia Institute of Technology, Atlanta, GA 30332, USA
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11
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Ganicz T, Rozga-Wijas K. Siloxane-Starch-Based Hydrophobic Coating for Multiple Recyclable Cellulosic Materials. MATERIALS 2021; 14:ma14174977. [PMID: 34501067 PMCID: PMC8433969 DOI: 10.3390/ma14174977] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 08/23/2021] [Accepted: 08/26/2021] [Indexed: 11/28/2022]
Abstract
The results of the application of a new hydrophobization agent based on a triethoxymethylsilane and standard starch aqueous mixture for mass-produced cellulosic materials—printing paper, paperboard, and sack paper—have been evaluated to examine whether such a mixture can be used in industrial practice. The application of this agent on laboratory sheets prepared in a repetitive recycling process was performed to investigate its influence on the formation and properties of the products, as well as the contamination of circulating water. Measurements of the water contact angle, Cobb tests, and water penetration dynamics (PDA) were performed to test the barrier properties of the resulting materials. The effects of the applied coatings and recycling process on the paper’s tensile strength, tear index, roughness, air permeance, and ISO brightness were studied. Studies have proven that this formulation imparts relatively high surface hydrophobicity to all materials tested (contact angles above 100°) and a significant improvement in barrier properties while maintaining good mechanical and optical performance. The agent also does not interfere with the pulping and re-forming processes during recycling and increases circulation water contamination to an acceptable degree. Attenuated total reflectance Fourier-transform infrared (FT-IR) spectra of the paper samples revealed the presence of a polysiloxane network on the surface.
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Affiliation(s)
- Tomasz Ganicz
- Center of Papermaking and Printing, Lodz University of Technology, 90-924 Lodz, Poland
- Correspondence: ; Tel.: +48-426-313-807
| | - Krystyna Rozga-Wijas
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, 90-363 Lodz, Poland;
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12
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Hamidon NN, Salentijn GI, Verpoorte E. Enhanced passive mixing for paper microfluidics. RSC Adv 2021; 11:25677-25685. [PMID: 34354827 PMCID: PMC8311897 DOI: 10.1039/d1ra04916j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 07/19/2021] [Indexed: 11/21/2022] Open
Abstract
Imprecise control of fluid flows in paper-based devices is a major challenge in pushing the innovations in this area towards societal implementation. Assays on paper tend to have low reaction yield and reproducibility issues that lead to poor sensitivity and detection limits. Understanding and addressing these issues is key to improving the performance of paper-based devices. In this work, we use colorimetric analysis to observe the mixing behaviour of molecules from two parallel flow streams in unobstructed (on unpatterned paper) and constricted flow (through the gap of a patterned hourglass structure). The model system used for characterization of mixing involved the reaction of Fe3+ with SCN− to form the coloured, soluble complex Fe(SCN)2+. At all tested concentrations (equal concentrations of 50.0 mM, 25.0 mM or 12.5 mM for KSCN and FeCl3 in each experiment), the reaction yield increases (higher colorimetric signal) and better mixing is obtained (lower relative standard deviation) as the gap of the flow constriction becomes smaller (4.69–0.32 mm). This indicates enhanced passive mixing of reagents. A transition window of gap widths exhibiting no mixing enhancement (about 2 mm) to gap widths exhibiting complete mixing (0.5 mm) is defined. The implementation of gap sizes that are smaller than 0.5 mm (below the transition window) for passive mixing is suggested as a good strategy to obtain complete mixing and reproducible reaction yields on paper. In addition, the hourglass structure was used to define the ratio of reagents to be mixed (2 : 1, 1 : 1 and 1 : 2 HCl–NaOH) by simply varying the width ratio of the input channels of the paper. This allows easy adaptation of the device to reaction stoichiometry. Efficient passive mixing can be achieved by contricting the reagent flow using structures having narrow gaps.![]()
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Affiliation(s)
- Nurul Nadiah Hamidon
- Pharmaceutical Analysis, Groningen Research Institute of Pharmacy, University of Groningen 9700 AD Groningen The Netherlands +31 50 363 75 82 +31 50 363 33 37.,Faculty of Industrial Sciences and Technology, Universiti Malaysia Pahang 26300 Kuantan Malaysia
| | - Gert Ij Salentijn
- Laboratory of Organic Chemistry, Wageningen University and Research Stippeneng 4 6708 WE Wageningen The Netherlands
| | - Elisabeth Verpoorte
- Pharmaceutical Analysis, Groningen Research Institute of Pharmacy, University of Groningen 9700 AD Groningen The Netherlands +31 50 363 75 82 +31 50 363 33 37
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13
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Noviana E, Ozer T, Carrell CS, Link JS, McMahon C, Jang I, Henry CS. Microfluidic Paper-Based Analytical Devices: From Design to Applications. Chem Rev 2021; 121:11835-11885. [DOI: 10.1021/acs.chemrev.0c01335] [Citation(s) in RCA: 91] [Impact Index Per Article: 30.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Eka Noviana
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Universitas Gadjah Mada, Yogyakarta, Indonesia 55281
| | - Tugba Ozer
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
- Department of Bioengineering, Faculty of Chemical and Metallurgical Engineering, Yildiz Technical University, Istanbul, Turkey 34220
| | - Cody S. Carrell
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Jeremy S. Link
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Catherine McMahon
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - Ilhoon Jang
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
- Institute of Nano Science and Technology, Hanyang University, Seoul, South Korea 04763
| | - Charles S. Henry
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
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14
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Modha S, Castro C, Tsutsui H. Recent developments in flow modeling and fluid control for paper-based microfluidic biosensors. Biosens Bioelectron 2021; 178:113026. [PMID: 33545552 DOI: 10.1016/j.bios.2021.113026] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 12/31/2020] [Accepted: 01/19/2021] [Indexed: 12/30/2022]
Abstract
Over the last 10 years, researchers have shown that paper is a promising substrate for affordable biosensors. The field of paper-microfluidics has evolved rapidly in that time, with simple colorimetric assays giving way to more complex electrochemical devices that can handle multiple samples at a given time. As paper devices become more complex, the ability to precisely control different fluids simultaneously becomes a challenge. Specifically, automated flow control is a necessary attribute to make paper-based devices more useable in resource-limited settings. Flow control strategies on paper are typically developed experimentally through trial-and-error, with little focus on theory. This is because flow behavior in paper is not well understood and sometimes difficult to predict precisely. Additionally, popular theoretical models are too simplistic, making them unsuitable for complex device designs and application conditions. A better understanding of flow theory would allow devices conceived straight from theoretical models. This could save time and resources by reducing experimental work. In this review, we provide an overview of different theoretical models used to characterize imbibition in paper substrates and document the latest flow control strategies that have been applied to automated fluid control on paper. Additionally, we look at current efforts to commercialize paper-based devices along with challenges facing this industry.
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Affiliation(s)
- Sidharth Modha
- Department of Bioengineering, University of California, Riverside, Riverside, CA, 92521, USA
| | - Carlos Castro
- Department of Mechanical Engineering, California State Polytechnic University, Pomona, Pomona, CA, 91768, USA
| | - Hideaki Tsutsui
- Department of Bioengineering, University of California, Riverside, Riverside, CA, 92521, USA; Department of Mechanical Engineering, University of California, Riverside, Riverside, CA, 92521, USA; Stem Cell Center, University of California, Riverside, Riverside, CA, 92521, USA.
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15
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Strategies for the detection of target analytes using microfluidic paper-based analytical devices. Anal Bioanal Chem 2021; 413:2429-2445. [PMID: 33712916 DOI: 10.1007/s00216-021-03213-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 01/28/2021] [Accepted: 02/01/2021] [Indexed: 12/11/2022]
Abstract
Microfluidic paper-based analytical devices (μPADs) have developed rapidly in recent years, because of their advantages, such as small sample volume, rapid detection rates, low cost, and portability. Due to these characteristics, they can be used for in vitro diagnostics in the laboratory, or in the field, for a variety of applications, including food evaluation, disease screening, environmental monitoring, and drug testing. This review will present various detection methods employed by μPADs and their respective applications for the detection of target analytes. These include colorimetry, electrochemistry, chemiluminescence (CL), electrochemiluminescence (ECL), and fluorescence-based methodologies. At the same time, the choice of labeling material and the design of microfluidic channels are also important for detection results. The construction of novel nanocomponents and different smart structures of paper-based devices have improved the performance of μPADs and we will also highlight some of these in this manuscript. Additionally, some key challenges and future prospects for the use of μPADs are briefly discussed.
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16
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Patil Y, Dotseth K, Shapiro T, Pushparajan D, Binderup S, Horn JR, Korampally V. Modular design of paper based switches for autonomous lab-on paper micro devices. Biomed Microdevices 2020; 23:1. [PMID: 33247780 DOI: 10.1007/s10544-020-00537-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/11/2020] [Indexed: 02/01/2023]
Abstract
This paper presents a new approach towards the design of paper based autonomous microfluidic devices. Autonomy in the device operation is achieved through the incorporation of mechanically actuated microfluidic switches that are versatile in their design and may be configured to be simple time triggered ON or OFF switches or more complex switches that can be timed to be in multiple states (timed ON, followed by timed OFF). These switches are self-contained and require no external power for their operation, deriving their functionality solely through stored elastic energy. This paper presents the design and fabrication of these switches as fluidic analogs of electronic transistors, and their integration into microfluidic paper based circuit demonstrating their operation as a programmable paper-based microfluidic device.
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Affiliation(s)
- Yashodeep Patil
- Department of Electrical Engineering, Northern Illinois University, EB 340, DeKalb, IL, 60115, USA
| | - Kevin Dotseth
- Department of Electrical Engineering, Northern Illinois University, EB 340, DeKalb, IL, 60115, USA
| | - Theodore Shapiro
- Department of Electrical Engineering, Northern Illinois University, EB 340, DeKalb, IL, 60115, USA
| | - Dhakshenan Pushparajan
- Department of Electrical Engineering, Northern Illinois University, EB 340, DeKalb, IL, 60115, USA
| | - Stephen Binderup
- Department of Electrical Engineering, Northern Illinois University, EB 340, DeKalb, IL, 60115, USA
| | - James R Horn
- Department of Biochemistry, Northern Illinois University, DeKalb, IL, USA
| | - Venumadhav Korampally
- Department of Electrical Engineering, Northern Illinois University, EB 340, DeKalb, IL, 60115, USA.
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17
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Zargaryan A, Farhoudi N, Haworth G, Ashby JF, Au SH. Hybrid 3D printed-paper microfluidics. Sci Rep 2020; 10:18379. [PMID: 33110199 PMCID: PMC7591913 DOI: 10.1038/s41598-020-75489-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 10/08/2020] [Indexed: 11/13/2022] Open
Abstract
3D printed and paper-based microfluidics are promising formats for applications that require portable miniaturized fluid handling such as point-of-care testing. These two formats deployed in isolation, however, have inherent limitations that hamper their capabilities and versatility. Here, we present the convergence of 3D printed and paper formats into hybrid devices that overcome many of these limitations, while capitalizing on their respective strengths. Hybrid channels were fabricated with no specialized equipment except a commercial 3D printer. Finger-operated reservoirs and valves capable of fully-reversible dispensation and actuation were designed for intuitive operation without equipment or training. Components were then integrated into a versatile multicomponent device capable of dynamic fluid pathing. These results are an early demonstration of how 3D printed and paper microfluidics can be hybridized into versatile lab-on-chip devices.
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Affiliation(s)
- Arthur Zargaryan
- Department of Bioengineering, Imperial College London, London, SW7 2AZ, UK
| | - Nathalie Farhoudi
- Department of Bioengineering, Imperial College London, London, SW7 2AZ, UK
| | - George Haworth
- Department of Bioengineering, Imperial College London, London, SW7 2AZ, UK
| | - Julian F Ashby
- Department of Bioengineering, Imperial College London, London, SW7 2AZ, UK
| | - Sam H Au
- Department of Bioengineering, Imperial College London, London, SW7 2AZ, UK.
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18
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Kim TH, Hahn YK, Kim MS. Recent Advances of Fluid Manipulation Technologies in Microfluidic Paper-Based Analytical Devices (μPADs) toward Multi-Step Assays. MICROMACHINES 2020; 11:mi11030269. [PMID: 32143468 PMCID: PMC7142896 DOI: 10.3390/mi11030269] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 02/27/2020] [Accepted: 03/03/2020] [Indexed: 12/16/2022]
Abstract
Microfluidic paper-based analytical devices (μPADs) have been suggested as alternatives for developing countries with suboptimal medical conditions because of their low diagnostic cost, high portability, and disposable characteristics. Recently, paper-based diagnostic devices enabling multi-step assays have been drawing attention, as they allow complicated tests, such as enzyme-linked immunosorbent assay (ELISA) and polymerase chain reaction (PCR), which were previously only conducted in the laboratory, to be performed on-site. In addition, user convenience and price of paper-based diagnostic devices are other competitive points over other point-of-care testing (POCT) devices, which are more critical in developing countries. Fluid manipulation technologies in paper play a key role in realizing multi-step assays via μPADs, and the expansion of biochemical applications will provide developing countries with more medical benefits. Therefore, we herein aimed to investigate recent fluid manipulation technologies utilized in paper-based devices and to introduce various approaches adopting several principles to control fluids on papers. Fluid manipulation technologies are classified into passive and active methods. While passive valves are structurally simple and easy to fabricate, they are difficult to control in terms of flow at a specific spatiotemporal condition. On the contrary, active valves are more complicated and mostly require external systems, but they provide much freedom of fluid manipulation and programmable operation. Both technologies have been revolutionized in the way to compensate for their limitations, and their advances will lead to improved performance of μPADs, increasing the level of healthcare around the world.
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Affiliation(s)
| | - Young Ki Hahn
- Biomedical Convergence Science & Technology, Industrial Technology Advances, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Korea
- Correspondence: (Y.K.H.); (M.S.K.); Tel.: +82-53-950-2338 (Y.K.H.); +82-53-785-1740 (M.S.K.)
| | - Minseok S. Kim
- Department of New Biology, Daegu Gyeongbuk Institute of Science & Technology (DGIST), 333 Techno jungang-daero, Daegu 42988, Korea
- Correspondence: (Y.K.H.); (M.S.K.); Tel.: +82-53-950-2338 (Y.K.H.); +82-53-785-1740 (M.S.K.)
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19
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Li S, Ma Z, Cao Z, Pan L, Shi Y. Advanced Wearable Microfluidic Sensors for Healthcare Monitoring. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e1903822. [PMID: 31617311 DOI: 10.1002/smll.201903822] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 09/12/2019] [Indexed: 05/24/2023]
Abstract
Wearable flexible sensors based on integrated microfluidic networks with multiplex analysis capability are emerging as a new paradigm to assess human health status and show great potential in application fields such as clinical medicine and athletic monitoring. Well-designed microfluidic sensors can be attached to the skin surface to acquire various pieces of physiological information with high precision, such as sweat loss, information regarding metabolites, and electrolyte balance. Herein, the recent progress of wearable microfluidic sensors for applications in healthcare monitoring is summarized, including analysis principles and microfabrication methods. Finally, the challenges and opportunities for wearable microfluidic sensors in practical applications are discussed.
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Affiliation(s)
- Sheng Li
- Collaborative Innovation Center of Advanced Microstructures, Jiangsu Provincial Key Laboratory of Photonic and Electronic Materials, School of Electronic Science and Engineering, Nanjing University, 210093, Nanjing, China
| | - Zhong Ma
- Collaborative Innovation Center of Advanced Microstructures, Jiangsu Provincial Key Laboratory of Photonic and Electronic Materials, School of Electronic Science and Engineering, Nanjing University, 210093, Nanjing, China
| | - Zhonglin Cao
- Collaborative Innovation Center of Advanced Microstructures, Jiangsu Provincial Key Laboratory of Photonic and Electronic Materials, School of Electronic Science and Engineering, Nanjing University, 210093, Nanjing, China
| | - Lijia Pan
- Collaborative Innovation Center of Advanced Microstructures, Jiangsu Provincial Key Laboratory of Photonic and Electronic Materials, School of Electronic Science and Engineering, Nanjing University, 210093, Nanjing, China
| | - Yi Shi
- Collaborative Innovation Center of Advanced Microstructures, Jiangsu Provincial Key Laboratory of Photonic and Electronic Materials, School of Electronic Science and Engineering, Nanjing University, 210093, Nanjing, China
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20
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Guo X, Zong L, Jiao Y, Han Y, Zhang X, Xu J, Li L, Zhang CW, Liu Z, Ju Q, Liu J, Xu Z, Yu HD, Huang W. Signal-Enhanced Detection of Multiplexed Cardiac Biomarkers by a Paper-Based Fluorogenic Immunodevice Integrated with Zinc Oxide Nanowires. Anal Chem 2019; 91:9300-9307. [PMID: 31241314 DOI: 10.1021/acs.analchem.9b02557] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Using a single test to comprehensively evaluate multiple cardiac biomarkers for early diagnosis and prevention of acute myocardial infarction (AMI) has faced enormous challenges. Here, we have developed paper-based fluorogenic immunodevices for multiplexed detection of three cardiac biomarkers, namely, human heart-type fatty acid binding protein (FABP), cardiac troponin I (cTnI), and myoglobin, simultaneously. The detection is based on a strategy using zinc oxide nanowires (ZnO NWs) to enhance fluorescence signals (∼5-fold compared to that on pure paper). The immunodevices showed high sensitivity and selectivity for FABP, cTnI, and myoglobin with detection limits of 1.36 ng/mL, 1.00 ng/mL, and 2.38 ng/mL, respectively. Additionally, the paper-based immunoassay was rapid (∼5 min to complete the test) and portable (using a homemade chamber with a smartphone and an ultraviolet lamp). The developed devices integrated with ZnO NWs enable quantitative, sensitive, and simultaneous detection of multiple cardiac biomarkers in point-of-care settings, which provides a useful approach for monitoring AMI diseases and may be extended to other medical diagnostics and environmental assessments.
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Affiliation(s)
- Xueying Guo
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLOFE), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , P.R. China
| | - Lijun Zong
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLOFE), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , P.R. China
| | - Yucui Jiao
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLOFE), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , P.R. China
| | - Yufeng Han
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLOFE), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , P.R. China
| | - Xiaopan Zhang
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLOFE), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , P.R. China
| | - Jia Xu
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLOFE), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , P.R. China
| | - Lin Li
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLOFE), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , P.R. China
| | - Cheng-Wu Zhang
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLOFE), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , P.R. China
| | - Zhipeng Liu
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLOFE), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , P.R. China
| | - Qiang Ju
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLOFE), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , P.R. China
| | - Jinhua Liu
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLOFE), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , P.R. China
| | - Zhihui Xu
- Department of Cardiology , The First Affiliated Hospital of Nanjing Medical University , 300 Guangzhou Road , Nanjing 210029 , P.R. China
| | - Hai-Dong Yu
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLOFE), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , P.R. China.,Xi'an Institute of Flexible Electronics , Northwestern Polytechnical University , 127 West Youyi Road , Xi'an 710072 , P.R. China
| | - Wei Huang
- Institute of Advanced Materials (IAM) & Key Laboratory of Flexible Electronics (KLOFE), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , P.R. China.,Xi'an Institute of Flexible Electronics , Northwestern Polytechnical University , 127 West Youyi Road , Xi'an 710072 , P.R. China
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21
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Yakoh A, Chaiyo S, Siangproh W, Chailapakul O. 3D Capillary-Driven Paper-Based Sequential Microfluidic Device for Electrochemical Sensing Applications. ACS Sens 2019; 4:1211-1221. [PMID: 30969113 DOI: 10.1021/acssensors.8b01574] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This article describes the device design and fabrication of two different configurations (flow-through and stopped-flow) of a sequential fluid delivery platform on a microfluidic paper-based device. The developed device is capable of storing and transporting reagents sequentially to the detection channel without the need for external power. The device comprises two components: an origami folding paper (oPAD) and a movable reagent-stored pad (rPAD). This 3D capillary-driven device eliminates the undesirable procedure of multiple-step reagent manipulation in a complex assay. To demonstrate the scope of this approach, the device is used for electrochemical detection of biological species. Using a flow-through configuration, a self-calibration plot plus real sample analysis using a single buffer introduction are established for ascorbic acid detection. We further broaden the effectiveness of the device to a complex assay using a stopped-flow configuration. Unlike other electrochemical paper-based sensors in which the user is required to cut off the device inlet or rest for the whole channel saturation before measurement, herein a stopped-flow device is carefully designed to exclude the disturbance from the convective mass transport. As a proof of concept, multiple procedures for electrode modification and voltammetric determination of serotonin are illustrated. In addition, the research includes an impedimetric label-free immunosensor for α-fetoprotein using the modified stopped-flow device. The beneficial advantages of simplicity, low sample volume (1 μL), and ability to perform a complex assay qualify this innovative device for use with diverse applications.
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Affiliation(s)
| | | | - Weena Siangproh
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Wattana, Bangkok 10110, Thailand
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22
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Deng M, Liao C, Wang X, Chen S, Qi F, Zhao X, Yu P. A paper-based colorimetric microfluidic sensor fabricated by a novel spray painting prototyping process for iron analysis. CAN J CHEM 2019. [DOI: 10.1139/cjc-2018-0346] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A novel, simple, and low-cost spray painting technique has been developed for the fabrication of microfluidic paper-based devices. The devices that we developed utilize aerosol spray paint to build hydrophobic barriers and employ a hole puncher to obtain paper-based patterned layers and paper dots without using any specialized instruments (e.g., without a laser cutter). The entire manufacturing process is extremely simple, inexpensive, and rapid, which means that it can be applied broadly. Furthermore, the application of the device to iron detection was demonstrated. A linear relationship between the colour value and the iron concentration was observed from 0 to 0.02 g/L. The developed microfluidic paper-based device for iron detection exhibited a low detection limit (0.00090 g/L), good selectivity, and acceptable recovery.
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Affiliation(s)
- Muhan Deng
- School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, PR China
| | - Changhan Liao
- School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, PR China
| | - Xiufeng Wang
- School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, PR China
| | - Shangda Chen
- School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, PR China
| | - Fugang Qi
- School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, PR China
| | - Xueliang Zhao
- Key Laboratory of Geological Environment Monitoring Technology, Center for Hydrogeology and Environmental Geology Survey, Baoding 071051, PR China
| | - Peng Yu
- School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, PR China
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23
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Chen C, Zhao L, Zhang H, Shen X, Zhu Y, Chen H. Novel Wax Valves To Improve Distance-Based Analyte Detection in Paper Microfluidics. Anal Chem 2019; 91:5169-5175. [DOI: 10.1021/acs.analchem.8b05764] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
| | - Litao Zhao
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Han Zhang
- Department of Biological Engineering, Utah State University, 4105 Old Main Hill, Logan, Utah 84322, United States
| | | | - Yonggang Zhu
- School of Science, RMIT University Melbourne, Victoria 3001, Australia
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24
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Chang BS, Fratzl M, Boyer A, Martin A, Ahrenholtz HC, De Moraes I, Bloch JF, Dempsey NM, Thuo MM. Rapid Prototyping of Reconfigurable Microfluidic Channels in Undercooled Metal Particle-Elastomer Composites. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.8b06441] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Boyce S. Chang
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Mario Fratzl
- CNRS, Grenoble INP, Institute of Engineering, G2Elab, Université Grenoble Alpes, 38000 Grenoble, France
- CNRS, Grenoble INP, Institute of Engineering, Institut Néel, Université Grenoble Alpes, 38000 Grenoble, France
| | - Andrea Boyer
- Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Andrew Martin
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Henry C. Ahrenholtz
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Isabelle De Moraes
- CNRS, Grenoble INP, Institute of Engineering, Institut Néel, Université Grenoble Alpes, 38000 Grenoble, France
| | - Jean-Francis Bloch
- CNRS, Grenoble INP, Institute of Engineering, 3SR, Université Grenoble Alpes, 38000 Grenoble, France
| | - Nora M. Dempsey
- CNRS, Grenoble INP, Institute of Engineering, Institut Néel, Université Grenoble Alpes, 38000 Grenoble, France
| | - Martin M. Thuo
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, United States
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25
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Rosenfeld T, Bercovici M. Dynamic control of capillary flow in porous media by electroosmotic pumping. LAB ON A CHIP 2019; 19:328-334. [PMID: 30566158 DOI: 10.1039/c8lc01077c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Microfluidic paper-based analytical devices (μPADs) rely on capillary flow to achieve filling, mixing and delivery of liquids. We investigate the use of electroosmotic (EO) pumping as a mechanism for dynamic control of capillary flow in paper-based devices. The applied voltage can accelerate or decelerate the baseline capillary-driven velocity, as well as be used to create a tunable valve that reversibly switches the flow on and off in an electrically controlled manner. The method relies on simple fabrication and allows repeated actuation, providing a high degree of flexibility for automation of liquid delivery. We adapt the Lucas-Washburn model to account for EO pumping and provide an experimentally validated analytical model for the distance penetrated by the liquid as a function of time and the applied voltage. We show that the EO-pump can reduce filling time by 6.5-fold for channels spanning several cm in length, relative to capillary filling alone. We demonstrate the utilization of the EO-pump for a tunable and dynamic flow control that accelerates, decelerates and stops the flow on demand. Finally, we present the use of the EO-pump for fluid flow sequencing on a paper-based device.
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Affiliation(s)
- Tally Rosenfeld
- Faculty of Mechanical Engineering, Technion - Israel Institute of Technology, Haifa 3200003, Israel.
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26
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Fu H, Song P, Wu Q, Zhao C, Pan P, Li X, Li-Jessen NYK, Liu X. A paper-based microfluidic platform with shape-memory-polymer-actuated fluid valves for automated multi-step immunoassays. MICROSYSTEMS & NANOENGINEERING 2019; 5:50. [PMID: 31636936 PMCID: PMC6799814 DOI: 10.1038/s41378-019-0091-0] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 05/31/2019] [Accepted: 06/10/2019] [Indexed: 05/04/2023]
Abstract
Smart fluid manipulation with automatically controlled paper valves will enable automated and multi-step immunoassays on paper-based microfluidic devices. In this work, we present an integrated paper-based microfluidic platform with shape-memory polymer (SMP)-actuated fluid valves capable of automated colorimetric enzyme-linked immunosorbent assays (ELISAs). A single-layer microfluidic paper-based analytical device (μPAD) was designed to store all the reagents on the chip, and sequentially transfer reagents to a paper test zone following a specific ELISA protocol through automatic fluidic flow control by the multiple SMP-actuated valves. The actuation of a paper valve was based on the thermally responsive, duel-state shape transformation of a SMP sheet attached to the root of a paper cantilever beam for driving a hydrophilic paper bridge to connect and disconnect two paper channels. A portable colorimetric reader was developed to control the on-chip valve operations, quantify the colorimetric signal output, display the assay result, and wirelessly transmit the data to a smart phone for the application of telemedicine. Reliable operations of the paper valve and the entire μPAD were demonstrated with success rates of 97% and 93%, respectively. A detection mechanism for valve malfunction was designed and confirmed effective to identify any mal-operation of individual valves, thus rendering our platform reliable in real assays. For device calibration, we conducted direct ELISAs of rabbit IgG in phosphate-buffered saline (PBS), and achieved a low limit of detection (LOD) of 27 pM (comparable to that of standard and paper-based ELISAs). In order to demonstrate the clinical application of our multi-step immunoassay platform, we also conducted sandwich ELISAs to quantify the protein level of an inflammatory cytokine, namely tumor necrosis factor (TNF)-α, in surgically injured laryngeal tissues of rats. The protein levels of TNF-α were shown similar between the conventional and μPAD ELISAs.
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Affiliation(s)
- Hao Fu
- Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON M5S 3G8 Canada
- Department of Mechanical Engineering, McGill University, Montreal, QC H3A 0C3 Canada
| | - Pengfei Song
- Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON M5S 3G8 Canada
- Department of Mechanical Engineering, McGill University, Montreal, QC H3A 0C3 Canada
- Department of Electrical and Electronic Engineering, Xi’an Jiaotong-Liverpool University, 215123 Suzhou, Jiangsu China
| | - Qiyang Wu
- Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON M5S 3G8 Canada
- Department of Mechanical Engineering, McGill University, Montreal, QC H3A 0C3 Canada
| | - Chen Zhao
- Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON M5S 3G8 Canada
| | - Peng Pan
- Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON M5S 3G8 Canada
- Department of Mechanical Engineering, McGill University, Montreal, QC H3A 0C3 Canada
| | - Xiao Li
- Department of Mechanical Engineering, McGill University, Montreal, QC H3A 0C3 Canada
- Present Address: Department of Chemistry, Stanford University, Stanford, CA 94305 USA
| | - Nicole Y. K. Li-Jessen
- School of Communication Sciences and Disorders, McGill University, Montreal, QC H3A 1G1 Canada
| | - Xinyu Liu
- Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON M5S 3G8 Canada
- Institute of Biomaterials and Biomedical Engineering, University of Toronto, Toronto, ON M5S 3G9 Canada
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Gregory PR, Martin A, Chang BS, Oyola-Reynoso S, Bloch JF, Thuo MM. Inverting Thermal Degradation ( iTD) of Paper Using Chemi- and Physi-Sorbed Modifiers for Templated Material Synthesis. Front Chem 2018; 6:338. [PMID: 30246006 PMCID: PMC6137831 DOI: 10.3389/fchem.2018.00338] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2018] [Accepted: 07/19/2018] [Indexed: 11/13/2022] Open
Abstract
Fibrous cellulosic materials have been used as templates for material synthesis or organization via thermal degradation of the cellulose. Most of these methods, however, fail to exploit fiber organization, in part due to loss of structure with processing. Herein, we demonstrate that chemi- and physi-sorbed modifiers of cellulose alters the thermal degradation mechanism allowing for controlled deposition of oxide and carbon (incomplete combustion) along the original paper fiber network. We demonstrate that the degradation of the cellulose fibers depends on the amount of physisorbed material due, in part, to effect on the propagation of the ignition event. From the distribution of the residual elements and shape of the deposits, we can infer that the thermal degradation process depends on the nature, and concentration, of filler(s) or occluded.
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Affiliation(s)
- Paul R. Gregory
- Department of Materials Science and Engineering, Iowa State University, Ames, IA, United States
| | - Andrew Martin
- Department of Materials Science and Engineering, Iowa State University, Ames, IA, United States
| | - Boyce S. Chang
- Department of Materials Science and Engineering, Iowa State University, Ames, IA, United States
| | - Stephanie Oyola-Reynoso
- Department of Materials Science and Engineering, Iowa State University, Ames, IA, United States
| | - Jean-Francis Bloch
- CNRS, Grenoble INP, Institute of Engineering, 3SR, Université Grenoble Alpes, Grenoble, France
| | - Martin M. Thuo
- Department of Materials Science and Engineering, Iowa State University, Ames, IA, United States
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