1
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Dissanayake J, Kang SB, Park J, Yinbao F, Park S, Lee MH. Predicting the wicking rate of nitrocellulose membranes from recipe data: a case study using ANN at a membrane manufacturing in South Korea. ANAL SCI 2024; 40:907-915. [PMID: 38598050 PMCID: PMC11035436 DOI: 10.1007/s44211-024-00540-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Accepted: 02/20/2024] [Indexed: 04/11/2024]
Abstract
Lateral flow assays have been widely used for detecting coronavirus disease 2019 (COVID-19). A lateral flow assay consists of a Nitrocellulose (NC) membrane, which must have a specific lateral flow rate for the proteins to react. The wicking rate is conventionally used as a method to assess the lateral flow in membranes. We used multiple regression and artificial neural networks (ANN) to predict the wicking rate of NC membranes based on membrane recipe data. The developed ANN predicted the wicking rate with a mean square error of 0.059, whereas the multiple regression had a square error of 0.503. This research also highlighted the significant impact of the water content on the wicking rate through images obtained from scanning electron microscopy. The findings of this research can cut down the research and development costs of novel NC membranes with a specific wicking rate significantly, as the algorithm can predict the wicking rate based on the membrane recipe.
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Affiliation(s)
- Janith Dissanayake
- Newnop Co. Ltd, 2209, 22nd Floor, Building A, 58-1, Giheung-Ro, Giheung-Gu, Yongin-Si, Gyeonggi-Do, South Korea
- Department of Civil and Environmental Engineering, Seoul National University, 1 Gwanak-Ro, Gwanak-Gu, Seoul, 08826, South Korea
| | - Sung Bong Kang
- Newnop Co. Ltd, 2209, 22nd Floor, Building A, 58-1, Giheung-Ro, Giheung-Gu, Yongin-Si, Gyeonggi-Do, South Korea
| | - Jihoon Park
- Department of Medical Device Industry, Yonsei University College of Medicine, 50 Yonsei-Ro, Seodaemun-Gu, Seoul, 03722, Republic of Korea
| | - Fang Yinbao
- School of Integrative Engineering, 84 Heukseok-Ro, Dongjak-Gu, Seoul, 06974, Republic of Korea
| | - Sungryul Park
- UMTR Co.,Ltd., 424-ho (Center M) 33, Sagimakgol-ro 62beon-gil, Jungwon-gu, Seongnam-si, Gyeonggi-Do, Republic of Korea.
| | - Min-Ho Lee
- School of Integrative Engineering, 84 Heukseok-Ro, Dongjak-Gu, Seoul, 06974, Republic of Korea.
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2
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Ma H, Kinzer-Ursem TL, Linnes JC. Two-phase Porous Media Flow Model Based on the Incompressible Navier-Stokes Equation. Anal Chem 2024; 96:5265-5273. [PMID: 38502904 DOI: 10.1021/acs.analchem.3c05982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2024]
Abstract
Two-phase porous media flow is important in many applications from drug delivery to groundwater diffusion and oil recovery and is of particular interest to biomedical diagnostic test developers using cellulose and nitrocellulose membranes with limited fluid sample volumes. This work presents a new two-phase porous media flow model based on the incompressible Navier-Stokes equation. The model aims to address the limitations of existing methods by incorporating a partial saturation distribution in porous media to account for limited fluid volumes. The basic parameters of the model are the pore size distribution and the contact angle. To validate the model, we solved five analytical solutions and compared them to corresponding experimental data. The experimentally measured penetration length data agreed with the model predictions, demonstrating model accuracy. Our findings suggest that this new two-phase porous media flow model can provide a valuable tool for researchers developing fluidic assays in paper and other porous media.
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Affiliation(s)
- Hui Ma
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Tamara L Kinzer-Ursem
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Jacqueline C Linnes
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907, United States
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3
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Abdullah IH, Wilson DJ, Mora AC, Parker RW, Mace CR. Generating signals at converging liquid fronts to create line-format readouts of soluble assay products in three-dimensional paper-based devices. LAB ON A CHIP 2023; 23:4010-4018. [PMID: 37581363 DOI: 10.1039/d3lc00511a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/16/2023]
Abstract
The correct interpretation of the result from a point-of-care device is crucial for an accurate and rapid diagnosis to guide subsequent treatment. Lateral flow tests (LFTs) use a well-established format that was designed to simplify the user experience. However, the LFT device architecture is inherently limited to detecting analytes that can be captured by molecular recognition. Microfluidic paper-based analytical devices (μPADs), like LFTs, have the potential to be used in diagnostic applications at the point of care. However, μPADs have not gained significant traction outside of academic laboratories, in part, because they have often demonstrated a lack of homogeneous shape or color in signal outputs, which consequently can lead to inaccurate interpretation of results by users. Here, we demonstrate a new class of μPADs that form colorimetric signals at the interfaces of converging liquid fronts (i.e., lines) to control where colorimetric signals are formed without relying on capture techniques. We demonstrate our approach by developing assays for three classes of analytes-an ion, an enzyme, and a small molecule-to measure using iron(III), acetylcholinesterase, and lactate, respectively. Additionally, we show these devices have the potential to support multiplexed assays by generating multiple lines in a common readout zone. These results highlight the ability of this new paper-based device architecture to aid the interpretation of assays that create soluble products by using flow to constrain those colorimetric products in a familiar, line-format output.
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Affiliation(s)
| | - Daniel J Wilson
- Department of Chemistry, Tufts University, Medford, MA 02155, USA.
| | - Andrea C Mora
- Department of Chemistry, Tufts University, Medford, MA 02155, USA.
| | | | - Charles R Mace
- Department of Chemistry, Tufts University, Medford, MA 02155, USA.
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4
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Kong Z, Liu C, Li P, Li G, Yuan J, Yan W, Zhao X, Zhang X, Xing C. Development and application of lateral flow strip with three test lines for detection of deoxynivalenol in wheat. Food Chem 2023; 421:136114. [PMID: 37086521 DOI: 10.1016/j.foodchem.2023.136114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 04/03/2023] [Accepted: 04/04/2023] [Indexed: 04/09/2023]
Abstract
Lateral flow strip was widely used and their qualitative and quantitative performance was in continuous improvement. However, the traditional strip was in a single-test-line format, which restricted operators to making a semi-quantitative judgment around a desired threshold concentration. Herein, a single strip with three test lines (TTLS) was developed for the semi-quantitative and quantitative determination of deoxynivalenol (DON). Four visual detection thresholds were obtained under optimized conditions and 35 wheat samples with DON content from 45 µg/kg to 2841 µg/kg were used to verify the method. The detection results were compared with that of the traditional strip and UPLC-MS/MS. In a three-test-line format, TTLS could reveal at least 200, 500, 1000, and 2000 µg/kg DON existed in different samples by the naked eye. The agreement analysis and statistical results indicated the new TTLS can be used as a useful tool for quantitative detection of DON with wide dynamic range.
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Tay DMY, Kim S, Hao Y, Yee EH, Jia H, Vleck SM, Chilekwa M, Voldman J, Sikes HD. Accelerating the optimization of vertical flow assay performance guided by a rational systematic model-based approach. Biosens Bioelectron 2023; 222:114977. [PMID: 36516633 DOI: 10.1016/j.bios.2022.114977] [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: 10/28/2022] [Accepted: 11/29/2022] [Indexed: 12/12/2022]
Abstract
Rapid diagnostic tests (RDTs) have shown to be instrumental in healthcare and disease control. However, they have been plagued by many inefficiencies in the laborious empirical development and optimization process for the attainment of clinically relevant sensitivity. While various studies have sought to model paper-based RDTs, most have relied on continuum-based models that are not necessarily applicable to all operation regimes, and have solely focused on predicting the specific interactions between the antigen and binders. It is also unclear how the model predictions may be utilized for optimizing assay performance. Here, we propose a streamlined and simplified model-based framework, only relying on calibration with a minimal experimental dataset, for the acceleration of assay optimization. We show that our models are capable of recapitulating experimental data across different formats and antigen-binder-matrix combinations. By predicting signals due to both specific and background interactions, our facile approach enables the estimation of several pertinent assay performance metrics such as limit-of-detection, sensitivity, signal-to-noise ratio and difference. We believe that our proposed workflow would be a valuable addition to the toolset of any assay developer, regardless of the amount of resources they have in their arsenal, and aid assay optimization at any stage in their assay development process.
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Affiliation(s)
- Dousabel M Y Tay
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA; Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA; Microsystems Technology Laboratory, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Seunghyeon Kim
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Yining Hao
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Emma H Yee
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Huan Jia
- Antimicrobial Resistance Integrated Research Group, Singapore-MIT Alliance for Research and Technology, 1 CREATE Way, Singapore, 138602, Singapore
| | - Sydney M Vleck
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Makaya Chilekwa
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Joel Voldman
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA; Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA; Microsystems Technology Laboratory, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Hadley D Sikes
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA; Antimicrobial Resistance Integrated Research Group, Singapore-MIT Alliance for Research and Technology, 1 CREATE Way, Singapore, 138602, Singapore.
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6
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Lazzarini E, Pace A, Trozzi I, Zangheri M, Guardigli M, Calabria D, Mirasoli M. An Origami Paper-Based Biosensor for Allergen Detection by Chemiluminescence Immunoassay on Magnetic Microbeads. BIOSENSORS 2022; 12:825. [PMID: 36290961 PMCID: PMC9599061 DOI: 10.3390/bios12100825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/10/2022] [Revised: 09/26/2022] [Accepted: 09/27/2022] [Indexed: 06/16/2023]
Abstract
Food allergies are adverse health effects that arise from specific immune responses, occurring upon exposure to given foods, even if present in traces. Egg allergy is one of the most common food allergies, mainly caused by egg white proteins, with ovalbumin being the most abundant. As allergens can also be present in foodstuff due to unintended contamination, there is a need for analytical tools that are able to rapidly detect allergens in food products at the point-of-use. Herein, we report an origami paper-based device for detecting ovalbumin in food samples, based on a competitive immunoassay with chemiluminescence detection. In this biosensor, magnetic microbeads have been employed for easy and efficient immobilization of ovalbumin on paper. Immobilized ovalbumin competes with the ovalbumin present in the sample for a limited amount of enzyme-labelled anti-ovalbumin antibody. By exploiting the origami approach, a multistep analytical procedure could be performed using reagents preloaded on paper layers, thus providing a ready-to-use immunosensing platform. The assay provided a limit of detection (LOD) of about 1 ng mL-1 for ovalbumin and, when tested on ovalbumin-spiked food matrices (chocolate chip cookies), demonstrated good assay specificity and accuracy, as compared with a commercial immunoassay kit.
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Affiliation(s)
- Elisa Lazzarini
- Department of Chemistry “Giacomo Ciamician”, Alma Mater Studiorum, University of Bologna, Via Francesco Selmi 2, I-40126 Bologna, Italy
| | - Andrea Pace
- Department of Chemistry “Giacomo Ciamician”, Alma Mater Studiorum, University of Bologna, Via Francesco Selmi 2, I-40126 Bologna, Italy
| | - Ilaria Trozzi
- Department of Chemistry “Giacomo Ciamician”, Alma Mater Studiorum, University of Bologna, Via Francesco Selmi 2, I-40126 Bologna, Italy
| | - Martina Zangheri
- Department of Chemistry “Giacomo Ciamician”, Alma Mater Studiorum, University of Bologna, Via Francesco Selmi 2, I-40126 Bologna, Italy
- Interdepartmental Centre for Industrial Agrofood Research (CIRI AGRO), Alma Mater Studiorum, University of Bologna, Via Quinto Bucci 336, I-47521 Cesena, Italy
- Interdepartmental Centre for Industrial Research in Advanced Mechanical Engineering Applications and Materials Technology (CIRI MAM), Alma Mater Studiorum, University of Bologna, Viale Risorgimento 2, I-40136 Bologna, Italy
| | - Massimo Guardigli
- Department of Chemistry “Giacomo Ciamician”, Alma Mater Studiorum, University of Bologna, Via Francesco Selmi 2, I-40126 Bologna, Italy
- Interdepartmental Centre for Industrial Research in Renewable Resources, Environment, Sea and Energy (CIRI FRAME), Alma Mater Studiorum, University of Bologna, Via Sant’Alberto 163, I-48123 Ravenna, Italy
- Interdepartmental Centre for Industrial Aerospace Research (CIRI AEROSPACE), Alma Mater Studiorum, University of Bologna, Via Baldassarre Canaccini 12, I-47121 Forlì, Italy
| | - Donato Calabria
- Department of Chemistry “Giacomo Ciamician”, Alma Mater Studiorum, University of Bologna, Via Francesco Selmi 2, I-40126 Bologna, Italy
- Interdepartmental Centre for Industrial Aerospace Research (CIRI AEROSPACE), Alma Mater Studiorum, University of Bologna, Via Baldassarre Canaccini 12, I-47121 Forlì, Italy
| | - Mara Mirasoli
- Department of Chemistry “Giacomo Ciamician”, Alma Mater Studiorum, University of Bologna, Via Francesco Selmi 2, I-40126 Bologna, Italy
- Interdepartmental Centre for Industrial Research in Renewable Resources, Environment, Sea and Energy (CIRI FRAME), Alma Mater Studiorum, University of Bologna, Via Sant’Alberto 163, I-48123 Ravenna, Italy
- Interdepartmental Centre for Industrial Aerospace Research (CIRI AEROSPACE), Alma Mater Studiorum, University of Bologna, Via Baldassarre Canaccini 12, I-47121 Forlì, Italy
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7
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Agarwal P, Toley BJ. Unreacted Labeled PCR Primers Inhibit the Signal in a Nucleic Acid Lateral Flow Assay as Elucidated by a Transport Reaction Model. ACS MEASUREMENT SCIENCE AU 2022; 2:317-324. [PMID: 36785570 PMCID: PMC9885946 DOI: 10.1021/acsmeasuresciau.2c00005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Factors that affect the performance of the nucleic acid lateral flow assay (NALFA) have not been well studied. In this work, we identify two important phenomena that negatively affect signal intensities during the detection of PCR products using NALFA: (i) the presence of unreacted PCR primers, and (ii) the presence of excess PCR amplicons. This is the first report that highlights the negative effect of unreacted PCR primers on NALFA. The negative effect of excess amplicons, while not explicitly reported for NALFAs, emanates from an identical phenomenon in lateral flow immunoassays known as the "hook effect". We show that the above effects may be alleviated by increasing the concentration of capture antibodies at the test line and the concentration of reporter moieties (gold nanoparticles). To demonstrate these, we utilized a PCR assay in which both primers were end-labeled, to generate dually end-labeled (bi-labeled) PCR amplicons of 230 bp length. To provide mechanistic understanding of these phenomena, we present the first transport-reaction model of NALFA, the results of which qualitatively matched all observed phenomena. Based on these results, we provide recommendations for the optimal design of PCR for NALFA detection.
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Affiliation(s)
- Priyanka Agarwal
- Department
of Chemical Engineering, Indian Institute
of Science, Bengaluru, Karnataka 560012, India
| | - Bhushan J. Toley
- Department
of Chemical Engineering, Indian Institute
of Science, Bengaluru, Karnataka 560012, India
- Center
for Biosystems Science and Engineering, Indian Institute of Science, Bengaluru, Karnataka 560012, India
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8
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Newsham EI, Phillips EA, Ma H, Chang MM, Wereley ST, Linnes JC. Characterization of wax valving and μPIV analysis of microscale flow in paper-fluidic devices for improved modeling and design. LAB ON A CHIP 2022; 22:2741-2752. [PMID: 35762978 PMCID: PMC9362854 DOI: 10.1039/d2lc00297c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Paper-fluidic devices are a popular platform for point-of-care diagnostics due to their low cost, ease of use, and equipment-free detection of target molecules. They are limited, however, by their lack of sensitivity and inability to incorporate more complex processes, such as nucleic acid amplification or enzymatic signal enhancement. To address these limitations, various valves have previously been implemented in paper-fluidic devices to control fluid obstruction and release. However, incorporation of valves into new devices is a highly iterative, time-intensive process due to limited experimental data describing the microscale flow that drives the biophysical reactions in the assay. In this paper, we tested and modeled different geometries of thermally actuated valves to investigate how they can be more easily implemented in an LFIA with precise control of actuation time, flow rate, and flow pattern. We demonstrate that bulk flow measurements alone cannot estimate the highly variable microscale properties and effects on LFIA signal development. To further quantify the microfluidic properties of paper-fluidic devices, micro-particle image velocimetry was used to quantify fluorescent nanoparticle flow through the membranes and demonstrated divergent properties from bulk flow that may explain additional variability in LFIA signal generation. Altogether, we demonstrate that a more robust characterization of paper-fluidic devices can permit fine-tuning of parameters for precise automation of multi-step assays and inform analytical models for more efficient design.
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Affiliation(s)
- Emilie I Newsham
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA.
- Department of Bioengineering, Rice University, Houston, TX 77030, USA
| | - Elizabeth A Phillips
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA.
| | - Hui Ma
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA.
| | - Megan M Chang
- Department of Bioengineering, Rice University, Houston, TX 77030, USA
| | - Steven T Wereley
- School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA
| | - Jacqueline C Linnes
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA.
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9
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Asghari S, Ekrami E, Barati F, Avatefi M, Mahmoudifard M. The role of the nanofibers in lateral flow assays enhancement: a critical review. INT J POLYM MATER PO 2022. [DOI: 10.1080/00914037.2022.2090360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Sahar Asghari
- Department of Industrial and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
| | - Elena Ekrami
- Department of Industrial and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
| | - Fatemeh Barati
- Department of Industrial and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
| | - Manizheh Avatefi
- Department of Industrial and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
| | - Matin Mahmoudifard
- Department of Industrial and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran
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10
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Altschuh P, Kunz W, Bremerich M, Reiter A, Selzer M, Nestler B. Wicking in Porous Polymeric Membranes: Determination of an Effective Capillary Radius to Predict the Flow Behavior in Lateral Flow Assays. MEMBRANES 2022; 12:membranes12070638. [PMID: 35877842 PMCID: PMC9318119 DOI: 10.3390/membranes12070638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 06/17/2022] [Accepted: 06/17/2022] [Indexed: 11/29/2022]
Abstract
The working principle of lateral flow assays, such as the widely used COVID-19 rapid tests, is based on the capillary-driven liquid transport of a sample fluid to a test line using porous polymeric membranes as the conductive medium. In order to predict this wicking process by simplified analytical models, it is essential to determine an effective capillary radius for the highly porous and open-pored membranes. In this work, a parametric study is performed with selected simplified structures, representing the complex microstructure of the membrane. For this, a phase-field approach with a special wetting boundary condition to describe the meniscus formation and the corresponding mean surface curvature for each structure setup is used. As a main result, an analytical correlation between geometric structure parameters and an effective capillary radius, based on a correction factor, are obtained. The resulting correlation is verified by applying image analysis methods on reconstructed computer tomography scans of two different porous polymeric membranes and thus determining the geometric structure parameters. Subsequently, a macroscale flow model that includes the correlated effective pore size and geometrical capillary radius is applied, and the results are compared with wicking experiments. Based on the derived correction function, it is shown that the analytical prediction of the wicking process in highly porous polymeric membranes is possible without the fitting of experimental wicking data. Furthermore, it can be seen that the estimated effective pore radius of the two membranes is 8 to 10 times higher than their geometric mean pore radii.
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Affiliation(s)
- Patrick Altschuh
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestr. 30, 76133 Karlsruhe, Germany; (A.R.); (M.S.); (B.N.)
- Institute for Applied Materials–Microstructure Modelling and Simulation, Karlsruhe Institute of Technology, Strasse am Forum 7, 76131 Karlsruhe, Germany
- Correspondence: (P.A.); (W.K.)
| | - Willfried Kunz
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestr. 30, 76133 Karlsruhe, Germany; (A.R.); (M.S.); (B.N.)
- Correspondence: (P.A.); (W.K.)
| | - Marcel Bremerich
- Sartorius Stedim Biotech GmbH, August-Spindler-Strasse 11, 37079 Goettingen, Germany;
| | - Andreas Reiter
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestr. 30, 76133 Karlsruhe, Germany; (A.R.); (M.S.); (B.N.)
| | - Michael Selzer
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestr. 30, 76133 Karlsruhe, Germany; (A.R.); (M.S.); (B.N.)
- Institute for Applied Materials–Microstructure Modelling and Simulation, Karlsruhe Institute of Technology, Strasse am Forum 7, 76131 Karlsruhe, Germany
| | - Britta Nestler
- Institute for Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestr. 30, 76133 Karlsruhe, Germany; (A.R.); (M.S.); (B.N.)
- Institute for Applied Materials–Microstructure Modelling and Simulation, Karlsruhe Institute of Technology, Strasse am Forum 7, 76131 Karlsruhe, Germany
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11
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Zherdev AV, Dzantiev BB. Detection Limits of Immunoanalytical Systems: Limiting Factors and Methods of Reduction. JOURNAL OF ANALYTICAL CHEMISTRY 2022. [DOI: 10.1134/s1061934822040141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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He G, Dong T, Yang Z, Branstad A, Huang L, Jiang Z. Point-of-care COPD diagnostics: biomarkers, sampling, paper-based analytical devices, and perspectives. Analyst 2022; 147:1273-1293. [PMID: 35113085 DOI: 10.1039/d1an01702k] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Chronic obstructive pulmonary disease (COPD) has become the third leading cause of global death. Insufficiency in early diagnosis and treatment of COPD, especially COPD exacerbations, leads to a tremendous economic burden and medical costs. A cost-effective and timely prevention requires decentralized point-of-care diagnostics at patients' residences at affordable prices. Advances in point-of-care (POC) diagnostics may offer new solutions to reduce medical expenditures by measuring salivary and blood biomarkers. Among them, paper-based analytical devices have been the most promising candidates due to their advantages of being affordable, biocompatible, disposable, scalable, and easy to modify. In this review, we present salivary and blood biomarkers related to COPD endotypes and exacerbations, summarize current technologies to collect human whole saliva and whole blood samples, evaluate state-of-the-art paper-based analytical devices that detect COPD biomarkers in saliva and blood, and discuss existing challenges with outlooks on future paper-based POC systems for COPD diagnosis and management.
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Affiliation(s)
- Guozhen He
- Chongqing Key Laboratory of Micro-Nano Systems and Smart Transduction, Chongqing Key Laboratory of Colleges and Universities on Micro-Nano Systems Technology and Smart Transducing, Collaborative Innovation Center on Micro-Nano Transduction and Intelligent Eco-Internet of Things, Chongqing Academician and Expert Workstation, Chongqing Technology and Business University, Nan'an District, Chongqing 400067, China.,Department of Microsystems (IMS), Faculty of Technology, Natural Sciences and Maritime Sciences, University of South-Eastern Norway, Postboks 235, 3603 Kongsberg, Norway.
| | - Tao Dong
- Department of Microsystems (IMS), Faculty of Technology, Natural Sciences and Maritime Sciences, University of South-Eastern Norway, Postboks 235, 3603 Kongsberg, Norway.
| | - Zhaochu Yang
- Chongqing Key Laboratory of Micro-Nano Systems and Smart Transduction, Chongqing Key Laboratory of Colleges and Universities on Micro-Nano Systems Technology and Smart Transducing, Collaborative Innovation Center on Micro-Nano Transduction and Intelligent Eco-Internet of Things, Chongqing Academician and Expert Workstation, Chongqing Technology and Business University, Nan'an District, Chongqing 400067, China
| | - Are Branstad
- University of Southeast Norway (USN), School of Business, Box 235, 3603 Kongsberg, Norway
| | - Lan Huang
- Chongqing Key Laboratory of Micro-Nano Systems and Smart Transduction, Chongqing Key Laboratory of Colleges and Universities on Micro-Nano Systems Technology and Smart Transducing, Collaborative Innovation Center on Micro-Nano Transduction and Intelligent Eco-Internet of Things, Chongqing Academician and Expert Workstation, Chongqing Technology and Business University, Nan'an District, Chongqing 400067, China
| | - Zhuangde Jiang
- Chongqing Key Laboratory of Micro-Nano Systems and Smart Transduction, Chongqing Key Laboratory of Colleges and Universities on Micro-Nano Systems Technology and Smart Transducing, Collaborative Innovation Center on Micro-Nano Transduction and Intelligent Eco-Internet of Things, Chongqing Academician and Expert Workstation, Chongqing Technology and Business University, Nan'an District, Chongqing 400067, China
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13
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Bikkarolla SK, McNamee SE, Vance P, McLaughlin J. High-Sensitive Detection and Quantitative Analysis of Thyroid-Stimulating Hormone Using Gold-Nanoshell-Based Lateral Flow Immunoassay Device. BIOSENSORS 2022; 12:182. [PMID: 35323452 PMCID: PMC8946628 DOI: 10.3390/bios12030182] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 02/22/2022] [Accepted: 03/17/2022] [Indexed: 06/14/2023]
Abstract
Au nanoparticles (AuNPs) have been used as signal reporters in colorimetric lateral flow immunoassays (LFAs) for decades. However, it remains a major challenge to significantly improve the detection sensitivity of traditional LFAs due to the low brightness of AuNPs. As an alternative approach, we overcome this problem by utilizing 150 nm gold nanoshells (AuNSs) that were engineered by coating low-density silica nanoparticles with a thin layer of gold. AuNSs are dark green, have 14 times larger surface area, and are approximately 35 times brighter compared to AuNPs. In this study, we used detection of thyroid-stimulating hormone (TSH) in a proof-of-concept assay. The limit of detection (LOD) with AuNS-based LFA was 0.16 µIU/mL, which is 26 times more sensitive than the conventional colorimetric LFA that utilizes AuNP as a label. The dynamic range of the calibration curve was 0.16−9.5 µIU/mL, making it possible to diagnose both hyperthyroidism (<0.5 µIU/mL) and hypothyroidism (>5 µIU/mL) using AuNS-based LFA. Thus, the developed device has a strong potential for early screening and diagnosis of diseases related to the thyroid hormone.
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Affiliation(s)
- Santosh Kumar Bikkarolla
- School of Engineering, Engineering Research Institute, University of Ulster, Newtownabbey BT37 0QB, UK;
| | - Sara E. McNamee
- School of Engineering, Engineering Research Institute, University of Ulster, Newtownabbey BT37 0QB, UK;
| | - Paul Vance
- Randox Laboratories Ltd., 55 Diamond Road, Crumlin, County Antrim BT29 4QY, UK;
| | - James McLaughlin
- School of Engineering, Engineering Research Institute, University of Ulster, Newtownabbey BT37 0QB, UK;
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14
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Wang Z, Zhao J, Xu X, Guo L, Xu L, Sun M, Hu S, Kuang H, Xu C, Li A. An Overview for the Nanoparticles-Based Quantitative Lateral Flow Assay. SMALL METHODS 2022; 6:e2101143. [PMID: 35041285 DOI: 10.1002/smtd.202101143] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/27/2021] [Indexed: 06/14/2023]
Abstract
The development of the lateral flow assay (LFA) has received much attention in both academia and industry because of their broad applications to food safety, environmental monitoring, clinical diagnosis, and so forth. The user friendliness, low cost, and easy operation are the most attractive advantages of the LFA. In recent years, quantitative detection has become another focus of LFA development. Here, the most recent studies of quantitative LFAs are reviewed. First, the principles and corresponding formats of quantitative LFAs are introduced. In the biomaterial and nanomaterial sections, the detection, capture, and signal amplification biomolecules and the optical, fluorescent, luminescent, and magnetic labels used in LFAs are described. The invention of dedicated strip readers has drawn further interest in exploiting the better performance of LFAs. Therefore, next, the development of dedicated reader devices is described and the usefulness and specifications of these devices for LFAs are discussed. Finally, the applications of LFAs in the detection of metal ions, biotoxins, pathogenic microorganisms, veterinary drugs, and pesticides in the fields of food safety and environmental health and the detection of nucleic acids, biomarkers, and viruses in clinical analyses are summarized.
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Affiliation(s)
- Zhongxing Wang
- State Key Laboratory of Food Science and Technology, Jiangnan University, No. 1800, Lihu Road, Wuxi, Jiangsu, 214122, P. R. China
- International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, No. 1800, Lihu Road, Wuxi, Jiangsu, 214122, P. R. China
| | - Jing Zhao
- Department of Radiology, Affiliated Hospital, Jiangnan University, No. 1000, Hefeng Road, Wuxi, Jiangsu, 214122, China
| | - Xinxin Xu
- State Key Laboratory of Food Science and Technology, Jiangnan University, No. 1800, Lihu Road, Wuxi, Jiangsu, 214122, P. R. China
- International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, No. 1800, Lihu Road, Wuxi, Jiangsu, 214122, P. R. China
| | - Lingling Guo
- State Key Laboratory of Food Science and Technology, Jiangnan University, No. 1800, Lihu Road, Wuxi, Jiangsu, 214122, P. R. China
- International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, No. 1800, Lihu Road, Wuxi, Jiangsu, 214122, P. R. China
| | - Liguang Xu
- State Key Laboratory of Food Science and Technology, Jiangnan University, No. 1800, Lihu Road, Wuxi, Jiangsu, 214122, P. R. China
- International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, No. 1800, Lihu Road, Wuxi, Jiangsu, 214122, P. R. China
| | - Maozhong Sun
- State Key Laboratory of Food Science and Technology, Jiangnan University, No. 1800, Lihu Road, Wuxi, Jiangsu, 214122, P. R. China
- International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, No. 1800, Lihu Road, Wuxi, Jiangsu, 214122, P. R. China
| | - Shudong Hu
- Department of Radiology, Affiliated Hospital, Jiangnan University, No. 1000, Hefeng Road, Wuxi, Jiangsu, 214122, China
| | - Hua Kuang
- State Key Laboratory of Food Science and Technology, Jiangnan University, No. 1800, Lihu Road, Wuxi, Jiangsu, 214122, P. R. China
- International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, No. 1800, Lihu Road, Wuxi, Jiangsu, 214122, P. R. China
| | - Chuanlai Xu
- State Key Laboratory of Food Science and Technology, Jiangnan University, No. 1800, Lihu Road, Wuxi, Jiangsu, 214122, P. R. China
- International Joint Research Laboratory for Biointerface and Biodetection, and School of Food Science and Technology, Jiangnan University, No. 1800, Lihu Road, Wuxi, Jiangsu, 214122, P. R. China
| | - Aike Li
- Academy of National Food and Strategic Reserves Administration, No. 11, Baiwanzhuang Street, Beijing, 100037, P. R. China
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15
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Corless E, Hao Y, Jia H, Kongsuphol P, Tay DMY, Ng SY, Sikes HD. Generation of Thermally Stable Affinity Pairs for Sensitive, Specific Immunoassays. Methods Mol Biol 2022; 2491:417-469. [PMID: 35482202 DOI: 10.1007/978-1-0716-2285-8_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Many point-of-care diagnostic tests rely on a pair of monoclonal antibodies that bind to two distinct epitopes of a molecule of interest. This protocol describes the identification and generation of such affinity pairs based on an easily produced small protein scaffold rcSso7d which can substitute monoclonal antibodies. These strong binding variants are identified from a large yeast display library. The approach described can be significantly faster than antibody generation and epitope binning, yielding affinity pairs synthesized in common bacterial protein synthesis strains, enabling the rapid generation of novel diagnostic tools.
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Affiliation(s)
- Elliot Corless
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Yining Hao
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Huan Jia
- Antimicrobial Resistance Interdisciplinary Research Group (AMR-IRG), Singapore-MIT Alliance in Research and Technology (SMART), Singapore, Singapore
| | - Patthara Kongsuphol
- Antimicrobial Resistance Interdisciplinary Research Group (AMR-IRG), Singapore-MIT Alliance in Research and Technology (SMART), Singapore, Singapore
| | - Dousabel M Y Tay
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Say Yong Ng
- Antimicrobial Resistance Interdisciplinary Research Group (AMR-IRG), Singapore-MIT Alliance in Research and Technology (SMART), Singapore, Singapore
| | - Hadley D Sikes
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
- Antimicrobial Resistance Interdisciplinary Research Group (AMR-IRG), Singapore-MIT Alliance in Research and Technology (SMART), Singapore, Singapore.
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16
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Kikkeri K, Wu D, Voldman J. A sample-to-answer electrochemical biosensor system for biomarker detection. LAB ON A CHIP 2021; 22:100-107. [PMID: 34889339 DOI: 10.1039/d1lc00910a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Biomarker detection is critical for the diagnosis and treatment of numerous diseases. Typically, target biomarkers in blood samples are measured through tests conducted at centralized laboratories. Testing at central laboratories increases wait times for results, in turn increasing healthcare costs and negatively impacting patient outcomes. Alternatively, point-of-care platforms enable the rapid measurement of biomarkers, expand testing location capabilities and mitigate manual processing steps through integration and automation. However, many of these systems focus on sample detection rather than the equally important sample preparation. Here we present a fully integrated and automated sample-to-answer electrochemical biosensing platform which incorporates each aspect of the biomarker testing workflow from blood collection to sample preparation to assay operation and readout. The system combines a commercial microneedle blood sampling device with membrane-based plasma filtration upstream of a bead-based electrochemical immunoassay. We characterize the high separation efficiency (>99%) and low non-specific binding of the whole blood-to-plasma filtration membrane under a range of operating conditions. We demonstrate a full sample-to-answer workflow through the analysis of interlukin-6-spiked blood samples.
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Affiliation(s)
- Kruthika Kikkeri
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
| | - Dan Wu
- Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
| | - Joel Voldman
- Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.
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17
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He G, Dong T, Yang Z, Jiang Z. Mitigating hook effect in one-step quantitative sandwich lateral flow assay by timed conjugate release. Talanta 2021; 240:123157. [PMID: 34968809 DOI: 10.1016/j.talanta.2021.123157] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2021] [Revised: 12/15/2021] [Accepted: 12/16/2021] [Indexed: 10/19/2022]
Abstract
Sandwich lateral flow assay (LFA) is one of the most successfully commercialized paper-based biosensors, which offers a rapid, low-cost, one-step assay. Despite its advantages, conventional sandwich LFA is fundamentally limited by the high-dose "hook" effect-a phenomenon that occurs at very high analyte concentrations and results in false-negative results. In this paper, we present a novel strategy of automatic timed detection antibody release to mitigate the hook effect in sandwich LFA without additional manual steps. We introduced an intermediate pad treated with saturated sucrose solution to regulate the flow between the nitrocellulose membrane and the conjugate pad in order to delay the reaction between detection antibodies and analytes. Using C-reactive protein (CRP) as a representative analyte, we demonstrated that our strategy exhibited a range of detection 10 times wider than that of our conventional LFA, without sacrificing the limit of detection. Comparing to other published strategies, our work could offer a one-step, cost-effective approach that is closely unified with the benefits of the LFA.
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Affiliation(s)
- Guozhen He
- Chongqing Key Laboratory of Micro-Nano Systems and Smart Transduction, Chongqing Key Laboratory of Colleges and Universities on Micro-Nano Systems Technology and Smart Transducing, Collaborative Innovation Center on Micro-Nano Transduction and Intelligent Eco-Internet of Things, Chongqing Academician and Expert Workstation, Chongqing Technology and Business University, Nan'an District, Chongqing, 400067, China; Department of Microsystems (IMS), Faculty of Technology, Natural Sciences and Maritime Sciences, University of South-Eastern Norway, Postboks 235, 3603, Kongsberg, Norway
| | - Tao Dong
- Department of Microsystems (IMS), Faculty of Technology, Natural Sciences and Maritime Sciences, University of South-Eastern Norway, Postboks 235, 3603, Kongsberg, Norway.
| | - Zhaochu Yang
- Chongqing Key Laboratory of Micro-Nano Systems and Smart Transduction, Chongqing Key Laboratory of Colleges and Universities on Micro-Nano Systems Technology and Smart Transducing, Collaborative Innovation Center on Micro-Nano Transduction and Intelligent Eco-Internet of Things, Chongqing Academician and Expert Workstation, Chongqing Technology and Business University, Nan'an District, Chongqing, 400067, China
| | - Zhuangde Jiang
- Chongqing Key Laboratory of Micro-Nano Systems and Smart Transduction, Chongqing Key Laboratory of Colleges and Universities on Micro-Nano Systems Technology and Smart Transducing, Collaborative Innovation Center on Micro-Nano Transduction and Intelligent Eco-Internet of Things, Chongqing Academician and Expert Workstation, Chongqing Technology and Business University, Nan'an District, Chongqing, 400067, China
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18
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Gao F, Liu C, Yao Y, Lei C, Li S, Yuan L, Song H, Yang Y, Wan J, Yu C. Quantum dots' size matters for balancing their quantity and quality in label materials to improve lateral flow immunoassay performance for C-reactive protein determination. Biosens Bioelectron 2021; 199:113892. [PMID: 34933225 DOI: 10.1016/j.bios.2021.113892] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 12/12/2021] [Accepted: 12/13/2021] [Indexed: 12/18/2022]
Abstract
Incorporating quantum dots (QDs) into dendritic mesoporous silica nanoparticles (DMSNs) for signal amplification of label materials represents an efficient strategy to improve the performance of lateral flow immunoassays (LFIAs). In this work, it is found that the CdSe/ZnS QD's size matters for balancing their loading amount and quantum yields (QYs) in the DMSNs-QDs based label materials and ultimately determining the performance of LFIA. The impacts of three CdSe/ZnS QDs with diameters of 9.1, 10.5 and 11.7 nm on CdSe/ZnS QDs incorporation and LFIA applications are studied. The increase of CdSe/ZnS QDs size from 9.1 to 11.7 nm results in a decrease in CdSe/ZnS QDs loading amount and an increase in QYs of incorporated CdSe/ZnS QDs. This trade-off leads to an optimized CdSe/ZnS QDs size of 10.5 nm, which exhibits the best LFIA performance due to the balanced QDs loading (2.26 g g-1) and QY (57.1%). The 10.5 nm CdSe/ZnS QDs incorporated DMSNs-QDs for C-reactive protein (CRP) detection achieved a limit of detection of 5 pg mL-1 (equivalent to 4.2 × 10-14 M) with naked eye, which is lower than literature reports and commercial LFIA products. This study demonstrates that the CdSe/ZnS QD's size matters for improving the quality of DMSNs-QDs and their LFIA performance for CRP determination, providing new insights into the rational design of advanced label materials for improving LFIA performance.
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Affiliation(s)
- Fang Gao
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Chao Liu
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, PR China
| | - Yining Yao
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, PR China
| | - Chang Lei
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland, 4072, Australia.
| | - Shumin Li
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, PR China
| | - Ling Yuan
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, PR China
| | - Hao Song
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Yannan Yang
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Jingjing Wan
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, PR China
| | - Chengzhong Yu
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland, 4072, Australia; School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, PR China.
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19
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Usha SP, Manoharan H, Deshmukh R, Álvarez-Diduk R, Calucho E, Sai VVR, Merkoçi A. Attomolar analyte sensing techniques (AttoSens): a review on a decade of progress on chemical and biosensing nanoplatforms. Chem Soc Rev 2021; 50:13012-13089. [PMID: 34673860 DOI: 10.1039/d1cs00137j] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Detecting the ultra-low abundance of analytes in real-life samples, such as biological fluids, water, soil, and food, requires the design and development of high-performance biosensing modalities. The breakthrough efforts from the scientific community have led to the realization of sensing technologies that measure the analyte's ultra-trace level, with relevant sensitivity, selectivity, response time, and sampling efficiency, referred to as Attomolar Analyte Sensing Techniques (AttoSens) in this review. In an AttoSens platform, 1 aM detection corresponds to the quantification of 60 target analyte molecules in 100 μL of sample volume. Herein, we review the approaches listed for various sensor probe design, and their sensing strategies that paved the way for the detection of attomolar (aM: 10-18 M) concentration of analytes. A summary of the technological advances made by the diverse AttoSens trends from the past decade is presented.
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Affiliation(s)
- Sruthi Prasood Usha
- Biomedical Engineering, Department of Applied Mechanics, Indian Institute of Technology Madras (IITM), India.
| | - Hariharan Manoharan
- Biomedical Engineering, Department of Applied Mechanics, Indian Institute of Technology Madras (IITM), India.
| | - Rehan Deshmukh
- Biomedical Engineering, Department of Applied Mechanics, Indian Institute of Technology Madras (IITM), India.
| | - Ruslan Álvarez-Diduk
- Nanobioelectronics & Biosensors Group, Institut Català de Nanociència i Nanotecnologia (ICN2), Campus UAB, Barcelona, Spain.
| | - Enric Calucho
- Nanobioelectronics & Biosensors Group, Institut Català de Nanociència i Nanotecnologia (ICN2), Campus UAB, Barcelona, Spain.
| | - V V R Sai
- Biomedical Engineering, Department of Applied Mechanics, Indian Institute of Technology Madras (IITM), India.
| | - Arben Merkoçi
- Nanobioelectronics & Biosensors Group, Institut Català de Nanociència i Nanotecnologia (ICN2), Campus UAB, Barcelona, Spain. .,ICREA, Institució Catalana de Recercai Estudis Avançats, Barcelona, Spain
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20
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Wang X, Jia P, Sun S, He X, Lu TJ, Xu F, Feng S. Evaporation-Induced Diffusion Acceleration in Liquid-Filled Porous Materials. ACS OMEGA 2021; 6:21646-21654. [PMID: 34471768 PMCID: PMC8388088 DOI: 10.1021/acsomega.1c03052] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 07/30/2021] [Indexed: 06/13/2023]
Abstract
Liquid-filled porous materials exist widely in nature and engineering fields, with the diffusion of substances in them playing an important role in system functions. Although surface evaporation is often inevitable in practical scenarios, the evaporation effects on diffusion behavior in liquid-filled porous materials have not been well explored yet. In this work, we performed noninvasive diffusion imaging experiments to observe the diffusion process of erioglaucine disodium salt dye in a liquid-filled nitrocellulose membrane under a wide range of relative humidities (RHs). We found that evaporation can significantly accelerate the diffusion rate and alter concentration distribution compared with the case without evaporation. We explained the accelerated diffusion phenomenon by the mechanism that evaporation would induce a weak flow in liquid-filled porous materials, which leads to convective diffusion, i.e., evaporation-induced flow and diffusion (EIFD). Based on the EIFD mechanism, we proposed a convective diffusion model to quantitatively predict the diffusion process in liquid-filled porous materials under evaporation and experimentally validated the model. Introducing the dimensionless Peclet (P e) number to measure the relative contribution of the evaporation effect to pure molecular diffusion, we demonstrated that even at a high RH of 95%, where the evaporation effect is usually assumed negligible in common sense, the evaporation-induced diffusion still overwhelms the molecular diffusion. The flow velocity induced by evaporation in liquid-filled porous materials was found to be 0.4-5 μm/s, comparable to flow in many biological and biomedical systems. The present analysis may help to explain the driving mechanism of tissue perfusion and provide quantitative analysis or inspire new control methods of flow and material exchange in numerous cutting-edge technologies, such as paper-based diagnostics, hydrogel-based flexible electronics, evaporation-induced electricity generation, and seawater purification.
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Affiliation(s)
- Xuefeng Wang
- The
Key Laboratory of Biomedical Information Engineering of Ministry of
Education, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an 710049, P. R. China
- Bioinspired
Engineering and Biomechanics Center (BEBC), Xi’an Jiaotong University, Xi’an 710049, P.
R. China
| | - Pengpeng Jia
- The
Key Laboratory of Biomedical Information Engineering of Ministry of
Education, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an 710049, P. R. China
- Bioinspired
Engineering and Biomechanics Center (BEBC), Xi’an Jiaotong University, Xi’an 710049, P.
R. China
| | - Shanyouming Sun
- Bioinspired
Engineering and Biomechanics Center (BEBC), Xi’an Jiaotong University, Xi’an 710049, P.
R. China
| | - Xiaocong He
- The
Key Laboratory of Biomedical Information Engineering of Ministry of
Education, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an 710049, P. R. China
- Bioinspired
Engineering and Biomechanics Center (BEBC), Xi’an Jiaotong University, Xi’an 710049, P.
R. China
| | - Tian Jian Lu
- State
Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China
- Nanjing
Center for Multifunctional Lightweight Materials and Structures (MLMS), Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China
| | - Feng Xu
- The
Key Laboratory of Biomedical Information Engineering of Ministry of
Education, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an 710049, P. R. China
- Bioinspired
Engineering and Biomechanics Center (BEBC), Xi’an Jiaotong University, Xi’an 710049, P.
R. China
| | - Shangsheng Feng
- The
Key Laboratory of Biomedical Information Engineering of Ministry of
Education, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an 710049, P. R. China
- Bioinspired
Engineering and Biomechanics Center (BEBC), Xi’an Jiaotong University, Xi’an 710049, P.
R. China
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21
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Tang Y, Gao H, Kurth F, Burr L, Petropoulos K, Migliorelli D, Guenat OT, Generelli S. Nanocellulose aerogel inserts for quantitative lateral flow immunoassays. Biosens Bioelectron 2021; 192:113491. [PMID: 34271399 DOI: 10.1016/j.bios.2021.113491] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Revised: 05/31/2021] [Accepted: 07/06/2021] [Indexed: 02/01/2023]
Abstract
The Lateral Flow Immuno Assay (LFIA) is a well-established technique that provides immediate results without high-cost laboratory equipment and technical skills from the users. However, conventional colorimetric LFIA strips suffer from high limits of detection, mainly due to the analysis of a limited sample volume, short reaction time between the target analyte and the conjugation molecules, and a weak optical signal. Thus, LFIAs are mainly employed as a medical diagnostic tool for qualitative and semi/quantitative detection, respectively. We applied a novel cellulose nanofiber (CNF) aerogel material incorporated into LFIA strips to increase the sample flow time, which in turn extends the binding interactions between the analyte of interest and the detection antibody, thus improving the limit of detection (LOD). Compared to a conventional LFIA strip, the longer sample flow time in the aerogel modified LFIA strips improved the LOD for the detection of mouse IgG in a buffer solution by a 1000-fold. The accomplished LOD (0.01 ng/mL) even outperformed specifications of a commercial ELISA kit by a factor of 10, and the CNF aerogel assisted LFIA was successfully applied to detect IgG in human serum with a LOD of 0.72 ng/mL. Next to the improved LOD, the aerogel assisted LFIA could quantify IgG samples in buffer and human serum in the concentration ranges of 0.17 ng/mL - 100 ng/mL (in buffer) and 4.6 ng/mL - 100 ng/mL (in human serum). The presented solution thus poses a unique potential to transform lateral flow assays into highly sensitive, fully quantitative point-of-care diagnostics.
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Affiliation(s)
- Ye Tang
- Swiss Center for Electronics and Microtechnology CSEM, Landquart Regional Center, Bahnhofstrasse 1, 7302, Landquart, Switzerland; University of Bern, ARTORG Center for Biomedical Engineering Research, Organs-on-Chip Technologies, Murtenstrasse 50, 3008, Bern, Switzerland
| | - Hui Gao
- Swiss Center for Electronics and Microtechnology CSEM, Landquart Regional Center, Bahnhofstrasse 1, 7302, Landquart, Switzerland
| | - Felix Kurth
- Swiss Center for Electronics and Microtechnology CSEM, Landquart Regional Center, Bahnhofstrasse 1, 7302, Landquart, Switzerland
| | - Loïc Burr
- Swiss Center for Electronics and Microtechnology CSEM, Landquart Regional Center, Bahnhofstrasse 1, 7302, Landquart, Switzerland
| | - Konstantinos Petropoulos
- Swiss Center for Electronics and Microtechnology CSEM, Landquart Regional Center, Bahnhofstrasse 1, 7302, Landquart, Switzerland
| | - Davide Migliorelli
- Swiss Center for Electronics and Microtechnology CSEM, Landquart Regional Center, Bahnhofstrasse 1, 7302, Landquart, Switzerland
| | - Olivier T Guenat
- University of Bern, ARTORG Center for Biomedical Engineering Research, Organs-on-Chip Technologies, Murtenstrasse 50, 3008, Bern, Switzerland
| | - Silvia Generelli
- Swiss Center for Electronics and Microtechnology CSEM, Landquart Regional Center, Bahnhofstrasse 1, 7302, Landquart, Switzerland.
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22
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Xiang X, Ye Q, Shang Y, Li F, Zhou B, Shao Y, Wang C, Zhang J, Xue L, Chen M, Ding Y, Wu Q. Quantitative detection of aflatoxin B 1 using quantum dots-based immunoassay in a recyclable gravity-driven microfluidic chip. Biosens Bioelectron 2021; 190:113394. [PMID: 34118762 DOI: 10.1016/j.bios.2021.113394] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Revised: 05/25/2021] [Accepted: 05/31/2021] [Indexed: 12/29/2022]
Abstract
To achieve rapid and sensitive detection of aflatoxin B1 (AFB1), we developed a polydimethylsiloxane gravity-driven cyclic microfluidic chip using the two-signal mode strategy. The structural design of the chip, together with the two-wavelength quantum dot ratio fluorescence, effectively eliminates the influence of environmental factors, improves the signal stability, and ensures that the final detection result positively correlates with the target concentration. Moreover, the theoretical analysis performed for the established physical model of the three-dimensional reaction interface inside the chip confirmed the improved reaction rate of immune adsorption in the microfluidic strategy. Overall, the method exhibited a wide analytic range (0.2-500 ng mL-1), low detection limit (0.06 ng mL-1), high specificity, good precision (coefficient of variation < 5%), excellent reusability (20 times, 89.1%) and satisfactory practical sample analysis capacity. Furthermore, the reusability and designability of this chip provide a reliable scheme for field detection of AFB1, analysis of other small molecules, and establishment of high-throughput detection systems under different conditions.
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Affiliation(s)
- Xinran Xiang
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China; School of Biology and Biological Engineering, South China University of Technology, Guangzhou, China
| | - Qinghua Ye
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China
| | - Yuting Shang
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China
| | - Fan Li
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China; School of Biology and Biological Engineering, South China University of Technology, Guangzhou, China
| | - Baoqing Zhou
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China; School of Biology and Biological Engineering, South China University of Technology, Guangzhou, China
| | - Yanna Shao
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China; Department of Food Science and Technology, Jinan University, Guangzhou, China
| | - Chufang Wang
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China; School of Biology and Biological Engineering, South China University of Technology, Guangzhou, China
| | - Jumei Zhang
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China
| | - Liang Xue
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China
| | - Moutong Chen
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China
| | - Yu Ding
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China; Department of Food Science and Technology, Jinan University, Guangzhou, China.
| | - Qingping Wu
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou, China; School of Biology and Biological Engineering, South China University of Technology, Guangzhou, China.
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23
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DeSousa JM, Jorge MZ, Lindsay HB, Haselton FR, Wright DW, Scherr TF. Inductively coupled plasma optical emission spectroscopy as a tool for evaluating lateral flow assays. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2021; 13:2137-2146. [PMID: 33876162 PMCID: PMC11095835 DOI: 10.1039/d1ay00236h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Lateral flow assays (LFAs) are immunochromatographic point-of-care devices that have greatly impacted disease diagnosis through their rapid, inexpensive, and easy-to-use form factor. While LFAs have been successful as field-deployable tools, they have a relatively poor limit of detection when compared to more complex methods. Moreover, most design and manufacturing optimization is achieved through time- and resource-intensive brute-force optimization. Despite increased interests in LFA manufacturing, more quantitative tools are needed to study current manufacturing protocols and therefore, optimize and streamline development of these devices further. In this work, we focus on a critical LFA component, colloidal gold conjugated to a detection antibody, one of the most commonly used reporter elements. This study utilizes inductively coupled plasma optical emission spectroscopy (ICP-OES) in conjunction with a lateral flow reader to quantitatively analyze colloidal gold distributions at the read-out test and control lines, as well as residual gold on the conjugate pad and other flow through regions. Our goals are to develop a more rigorous understanding of current LFA designs as well as a quantitative understanding of shortcomings of operational characteristics for future improvement. To our knowledge, this is the first time that ICP-OES has been used to study the initial distribution of colloidal gold on an unused LFA and its redistribution after a test is performed. Using three different brands of commercially available malaria LFAs, gold content was measured within each section of an LFA at varying parasite test concentrations. As expected, the total mass of gold remained unchanged after LFA use; however, the total mass of initial gold and its redistribution varied among manufacturers. Importantly, there are also some inherent inefficiencies that exist in these commercial LFA designs; for example, only 30% of the total gold deposited onto Brand A LFAs binds to the test and control lines, sections of the test that contain interpretable signal. Using information gathered with this method, future devices could be more purposefully engineered to focus on improved binding efficiency, resulting in reduced costs, improved limit of detection, and diminished test-to-test and manufacturer-to-manufacturer variability.
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Affiliation(s)
- Jenna M DeSousa
- Department of Chemistry, Vanderbilt University, Nashville, TN, USA.
| | - Micaella Z Jorge
- Department of Chemistry, Vanderbilt University, Nashville, TN, USA.
| | - Hayley B Lindsay
- Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, USA
| | - Frederick R Haselton
- Department of Chemistry, Vanderbilt University, Nashville, TN, USA. and Department of Biomedical Engineering, Vanderbilt University, Nashville, TN, USA
| | - David W Wright
- Department of Chemistry, Vanderbilt University, Nashville, TN, USA.
| | - Thomas F Scherr
- Department of Chemistry, Vanderbilt University, Nashville, TN, USA.
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24
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Gao F, Liu Y, Lei C, Liu C, Song H, Gu Z, Jiang P, Jing S, Wan J, Yu C. The Role of Dendritic Mesoporous Silica Nanoparticles' Size for Quantum Dots Enrichment and Lateral Flow Immunoassay Performance. SMALL METHODS 2021; 5:e2000924. [PMID: 34927850 DOI: 10.1002/smtd.202000924] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 01/18/2021] [Indexed: 06/14/2023]
Abstract
Using dendritic mesoporous silica nanoparticles (DMSNs) for quantum dots (QDs) enrichment and signal amplification is an emerging strategy for improving the detection sensitivity of lateral flow immunoassay (LFIA). In this study, a new and convenient approach is developed to prepare water-dispersible DMSNs-QDs. A series of DMSNs with various diameters (138, 251, 368, and 471 nm) are studied for loading QDs and LFIA applications. The resultant water-dispersible DMSNs-QDs exhibit a high fluorescence retention of 81.8%. The increase in particle size from 138 to 471 nm results in an increase in loading capacity of QDs and a decrease in binding quantity of the DMSNs-QDs in the test line of LFIA. This trade-off leads to an optimal DMSNs-QDs size of 368 nm with a limit of detection reaching 10 pg mL-1 (equivalent to 9.0 × 10-14 m) for the detection of C-reactive protein, which is nearly an order of magnitude more sensitive than the literature. To the best of the authors' knowledge, this study is the first to demonstrate the distinctive role of DMSN's size for QDs enrichment and LFIA. The strategy developed from this work is useful for the rational design of high-quality QDs-based nanoparticles for ultrasensitive detection.
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Affiliation(s)
- Fang Gao
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Yang Liu
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, P. R. China
| | - Chang Lei
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Chao Liu
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, P. R. China
| | - Hao Song
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland, 4072, Australia
| | - Zhengying Gu
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, P. R. China
| | - Pei Jiang
- Shanghai Fosun Long March Medical Science Company Limited, Shanghai, 200444, P. R. China
| | - Sheng Jing
- Shanghai Fosun Long March Medical Science Company Limited, Shanghai, 200444, P. R. China
| | - Jingjing Wan
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, P. R. China
| | - Chengzhong Yu
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Queensland, 4072, Australia
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, P. R. China
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25
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Shirshahi V, Liu G. Enhancing the analytical performance of paper lateral flow assays: From chemistry to engineering. Trends Analyt Chem 2021. [DOI: 10.1016/j.trac.2021.116200] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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26
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Xia G, Wang J, Liu Z, Bai L, Ma L. Effect of sample volume on the sensitivity of lateral flow assays through computational modeling. Anal Biochem 2021; 619:114130. [PMID: 33600781 DOI: 10.1016/j.ab.2021.114130] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2020] [Revised: 01/17/2021] [Accepted: 02/03/2021] [Indexed: 12/13/2022]
Abstract
Lateral flow assays (LFAs) are extensively used in qualitative detection because of their convenience, low cost, fast results, and ease of operation. However, the sample volume used in a lateral flow assay is usually determined experimentally. We test and find that the flow velocity is influenced by sample volume, using fluorescent microspheres as label particles, when analyte concentration is fixed in a sandwich LFA. A model is developed based on mass-action kinetics and advection-diffusion-reaction equation, combing the conjugate pad and nitrocellulose membrane. The model shows predictions from 10 to 120 μL, and predicts accurately the experimental results from 50 to 120 μL where the fluid can flow to the test line. Over all, the model can provide predictions over a wide range of sample volumes for sensitivity analysis. On the basis of the model, the sensitivity of the LFA can be improved according to the sample volume added in the experiment.
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Affiliation(s)
- Guo Xia
- Academy of Opto-electric Technology, Hefei University of Technology, Special Display and Imaging Technology Innovation Center of Anhui Province, State Key Laboratory of Advanced Display Technology, 193 Tunxi Road, Hefei, 230009, China.
| | - Jiangtao Wang
- Academy of Opto-electric Technology, Hefei University of Technology, Special Display and Imaging Technology Innovation Center of Anhui Province, State Key Laboratory of Advanced Display Technology, 193 Tunxi Road, Hefei, 230009, China
| | - Zhijian Liu
- School of Instrument Science and Opto-electronic Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei, 230009, China
| | - Lihao Bai
- Academy of Opto-electric Technology, Hefei University of Technology, Special Display and Imaging Technology Innovation Center of Anhui Province, State Key Laboratory of Advanced Display Technology, 193 Tunxi Road, Hefei, 230009, China
| | - Long Ma
- Academy of Opto-electric Technology, Hefei University of Technology, Special Display and Imaging Technology Innovation Center of Anhui Province, State Key Laboratory of Advanced Display Technology, 193 Tunxi Road, Hefei, 230009, China
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27
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Sotnikov DV, Zherdev AV, Dzantiev BB. Lateral Flow Serodiagnosis in the Double-Antigen Sandwich Format: Theoretical Consideration and Confirmation of Advantages. SENSORS (BASEL, SWITZERLAND) 2020; 21:E39. [PMID: 33374800 PMCID: PMC7795365 DOI: 10.3390/s21010039] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 12/11/2020] [Accepted: 12/16/2020] [Indexed: 11/22/2022]
Abstract
Determination of the presence in the blood of antibodies specific to the causative agent of a particular disease (serodiagnosis) is an effective approach in medical analytical chemistry. Serodiagnostics performed in the lateral flow immunoassay format (immunochromatography) meet the modern requirements for point-of-care testing and are supported by existing technologies of large-scale diagnostic tests production, thus increasing the amount of attention in a tense epidemiological situation. For traditional lateral flow serodiagnostics formats, a large number of nonspecific immunoglobulins in the sample significantly reduces the degree of detectable binding. To overcome these limitations, an assay based on the formation of immobilized antigen-specific antibody-labeled antigen complexes detection was proposed. However, the requirements for its implementation, providing maximum sensitivity, have not been established. This article describes the mathematical model for the above assay. The influence of the ratio of reagent concentrations on the analysis results is considered. It is noted that the formation of specific antibody complexes with several labeled antigens is the main limiting factor in reducing the detection limit, and methods are proposed to minimize this factor. Recommendations for the choice of the assay conditions, following from the analysis of the model, are confirmed experimentally.
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Affiliation(s)
- Dmitriy V. Sotnikov
- A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Prospect 33, 119071 Moscow, Russia; (A.V.Z.); (B.B.D.)
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28
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Sotnikov DV, Byzova NA, Zvereva EA, Bartosh AV, Zherdev AV, Dzantiev BB. Mathematical modeling of immunochromatographic test systems in a competitive format: Analytical and numerical approaches. Biochem Eng J 2020. [DOI: 10.1016/j.bej.2020.107763] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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29
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Upconverting nanoparticle reporter-based highly sensitive rapid lateral flow immunoassay for hepatitis B virus surface antigen. Anal Bioanal Chem 2020; 413:967-978. [PMID: 33230700 PMCID: PMC7813740 DOI: 10.1007/s00216-020-03055-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Revised: 10/22/2020] [Accepted: 11/09/2020] [Indexed: 01/22/2023]
Abstract
Detection of hepatitis B Virus surface antigen (HBsAg) is an established method for diagnosing both acute and chronic hepatitis B virus (HBV) infection. In addition to enzyme immunoassays (EIAs), rapid diagnostic tests (RDTs) are available for the detection of HBsAg in resource-poor settings. However, the available RDTs have inadequate sensitivity and therefore are not suitable for diagnosis of patients with low levels of HBsAg and for blood screening. To provide a high-sensitivity RDT, we developed a lateral flow immunoassay (LFIA) for HBsAg utilizing upconverting nanoparticle (UCNP) reporter. The UCNP-LFIA can use whole blood, serum, or plasma and the results can be read in 30 min using a reader device. When compared with a commercial conventional visually read LFIA, the developed UCNP-LFIA had a Limit of Detection (LoD) of 0.1 IU HBsAg/ml in spiked serum, whereas the LoD of the conventional LFIA was 3.2 IU HBsAg/ml. The developed UCNP-LFIA fulfills the WHO criterion for blood screening (LoD ≤ 0.13 IU HBsAg/ml) in terms of LoD. The UCNP-LFIA and conventional LFIA were evaluated with well-characterized sample panels. The UCNP-LFIA detected 20/24 HBsAg-positive samples within the HBsAg Performance Panel and 8/10 samples within the Mixed Titer Performance Panel, whereas the conventional LFIA detected 8/24 and 4/10 samples in these panels, respectively. The performance of the assays was further evaluated with HBsAg-positive (n = 108) and HBsAg-negative (n = 315) patient samples. In comparison with a central laboratory test, UCNP-LFIA showed 95.4% (95% CI: 89.5–98.5%) sensitivity whereas sensitivity of the conventional LFIA was 87.7% (95%CI: 79.9–93.3%).
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30
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Soft, skin-interfaced microfluidic systems with integrated immunoassays, fluorometric sensors, and impedance measurement capabilities. Proc Natl Acad Sci U S A 2020; 117:27906-27915. [PMID: 33106394 PMCID: PMC7668081 DOI: 10.1073/pnas.2012700117] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Soft microfluidic systems that capture, store, and perform biomarker analysis of microliter volumes of sweat, in situ, as it emerges from the surface of the skin, represent an emerging class of wearable technology with powerful capabilities that complement those of traditional biophysical sensing devices. Recent work establishes applications in the real-time characterization of sweat dynamics and sweat chemistry in the context of sports performance and healthcare diagnostics. This paper presents a collection of advances in biochemical sensors and microfluidic designs that support multimodal operation in the monitoring of physiological signatures directly correlated to physical and mental stresses. These wireless, battery-free, skin-interfaced devices combine lateral flow immunoassays for cortisol, fluorometric assays for glucose and ascorbic acid (vitamin C), and digital tracking of skin galvanic responses. Systematic benchtop evaluations and field studies on human subjects highlight the key features of this platform for the continuous, noninvasive monitoring of biochemical and biophysical correlates of the stress state.
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31
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Tutorial: design and fabrication of nanoparticle-based lateral-flow immunoassays. Nat Protoc 2020; 15:3788-3816. [PMID: 33097926 DOI: 10.1038/s41596-020-0357-x] [Citation(s) in RCA: 178] [Impact Index Per Article: 44.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 05/12/2020] [Indexed: 12/20/2022]
Abstract
Lateral-flow assays (LFAs) are quick, simple and cheap assays to analyze various samples at the point of care or in the field, making them one of the most widespread biosensors currently available. They have been successfully employed for the detection of a myriad of different targets (ranging from atoms up to whole cells) in all type of samples (including water, blood, foodstuff and environmental samples). Their operation relies on the capillary flow of the sample throughout a series of sequential pads, each with different functionalities aiming to generate a signal to indicate the absence/presence (and, in some cases, the concentration) of the analyte of interest. To have a user-friendly operation, their development requires the optimization of multiple, interconnected parameters that may overwhelm new developers. In this tutorial, we provide the readers with: (i) the basic knowledge to understand the principles governing an LFA and to take informed decisions during lateral flow strip design and fabrication, (ii) a roadmap for optimal LFA development independent of the specific application, (iii) a step-by-step example procedure for the assembly and operation of an LF strip for the detection of human IgG and (iv) an extensive troubleshooting section addressing the most frequent issues in designing, assembling and using LFAs. By changing only the receptors, the provided example procedure can easily be adapted for cost-efficient detection of a broad variety of targets.
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32
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Sena-Torralba A, Ngo DB, Parolo C, Hu L, Álvarez-Diduk R, Bergua JF, Rosati G, Surareungchai W, Merkoçi A. Lateral flow assay modified with time-delay wax barriers as a sensitivity and signal enhancement strategy. Biosens Bioelectron 2020; 168:112559. [PMID: 32890932 DOI: 10.1016/j.bios.2020.112559] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 08/24/2020] [Indexed: 02/08/2023]
Abstract
The ease of use, low cost and quick operation of lateral flow assays (LFA) have made them some of the most common point of care biosensors in a variety of fields. However, their generally low sensitivity has limited their use for more challenging applications, where the detection of low analytic concentrations is required. Here we propose the use of soluble wax barriers to selectively and temporarily accumulate the target and label nanoparticles on top of the test line (TL). This extended internal incubation step promotes the formation of the immune-complex, generating a 51.7-fold sensitivity enhancement, considering the limit of quantification, and up to 96% signal enhancement compared to the conventional LFA for Human IgG (H-IgG) detection.
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Affiliation(s)
- Amadeo Sena-Torralba
- Nanobioelectronics & Biosensors Group, Institut Català de Nanociència I Nanotecnologia (ICN2), CSIC and the Barcelona Institute of Science and Technology (BIST), Campus UAB, 08193, Bellaterra, Barcelona, Spain
| | - Duy Ba Ngo
- School of Bioresources and Technology, King Mongkut's University of Technology Thonburi (KMUTT), Bangkok, 10150, Thailand
| | - Claudio Parolo
- Nanobioelectronics & Biosensors Group, Institut Català de Nanociència I Nanotecnologia (ICN2), CSIC and the Barcelona Institute of Science and Technology (BIST), Campus UAB, 08193, Bellaterra, Barcelona, Spain
| | - Liming Hu
- Nanobioelectronics & Biosensors Group, Institut Català de Nanociència I Nanotecnologia (ICN2), CSIC and the Barcelona Institute of Science and Technology (BIST), Campus UAB, 08193, Bellaterra, Barcelona, Spain
| | - Ruslan Álvarez-Diduk
- Nanobioelectronics & Biosensors Group, Institut Català de Nanociència I Nanotecnologia (ICN2), CSIC and the Barcelona Institute of Science and Technology (BIST), Campus UAB, 08193, Bellaterra, Barcelona, Spain
| | - José Francisco Bergua
- Nanobioelectronics & Biosensors Group, Institut Català de Nanociència I Nanotecnologia (ICN2), CSIC and the Barcelona Institute of Science and Technology (BIST), Campus UAB, 08193, Bellaterra, Barcelona, Spain
| | - Giulio Rosati
- Nanobioelectronics & Biosensors Group, Institut Català de Nanociència I Nanotecnologia (ICN2), CSIC and the Barcelona Institute of Science and Technology (BIST), Campus UAB, 08193, Bellaterra, Barcelona, Spain
| | - Werasak Surareungchai
- School of Bioresources and Technology, King Mongkut's University of Technology Thonburi (KMUTT), Bangkok, 10150, Thailand; Nanoscience and Nanotechnology Graduate Research Program, Faculty of Science, KMUTT, Bangkok, 10140, Thailand
| | - Arben Merkoçi
- Nanobioelectronics & Biosensors Group, Institut Català de Nanociència I Nanotecnologia (ICN2), CSIC and the Barcelona Institute of Science and Technology (BIST), Campus UAB, 08193, Bellaterra, Barcelona, Spain; Catalan Institution for Research and Advanced Studies (ICREA), Pg. Lluís Company 23, 08010, Barcelona, Spain.
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33
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Ulep TH, Zenhausern R, Gonzales A, Knoff DS, Lengerke Diaz PA, Castro JE, Yoon JY. Smartphone based on-chip fluorescence imaging and capillary flow velocity measurement for detecting ROR1+ cancer cells from buffy coat blood samples on dual-layer paper microfluidic chip. Biosens Bioelectron 2020; 153:112042. [PMID: 32056660 PMCID: PMC7047888 DOI: 10.1016/j.bios.2020.112042] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 01/10/2020] [Accepted: 01/20/2020] [Indexed: 12/13/2022]
Abstract
Diagnosis of hematological cancer requires complete white blood cell count, followed by flow cytometry with multiple markers, and cytology. It requires substantial time and specialized training. A dual-layer paper microfluidic chip was developed as a quicker, low-cost, and field-deployable alternative to detect ROR1+ (receptor tyrosine-like orphan receptor one) cancer cells from the undiluted and untreated buffy coat blood samples. The first capture layer consisted of a GF/D glass fiber substrate, preloaded with cancer specific anti-ROR1 conjugated fluorescent particles to its center for cancer cell capture and direct smartphone fluorescence imaging. The second flow layer was comprised of a grade 1 cellulose chromatography paper with wax-printed four channels for wicking and capillary flow-based detection. The flow velocity was used as measure of antigen concentration in the buffy coat sample. In this manner, intact cells and their antigens were separated and independently analyzed by both imaging and flow velocity analyses. A custom-made smartphone-based fluorescence microscope and automated image processing and particle counter software were developed to enumerate particles on paper, with the limit of detection of 1 cell/μL. Flow velocity analysis showed even greater sensitivity, with the limit of detection of 0.1 cells/μL in the first 6 s of assay. Comparison with capillary flow model revealed great alignment with experimental data and greater correlation to viscosity than interfacial tension. Our proposed device is able to capture and on-chip image ROR1+ cancer cells within a complex sample matrix (buffy coat) while simultaneously quantifying cell concentration in a point-of-care manner.
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Affiliation(s)
- Tiffany-Heather Ulep
- Department of Biomedical Engineering, The University of Arizona, Tucson, AZ, 85721, United States
| | - Ryan Zenhausern
- Department of Biomedical Engineering, The University of Arizona, Tucson, AZ, 85721, United States
| | - Alana Gonzales
- Department of Biomedical Engineering, The University of Arizona, Tucson, AZ, 85721, United States
| | - David S Knoff
- Department of Biomedical Engineering, The University of Arizona, Tucson, AZ, 85721, United States
| | | | - Januario E Castro
- Hematology Oncology Division, Mayo Clinic, Phoenix, AZ, 85054, United States
| | - Jeong-Yeol Yoon
- Department of Biomedical Engineering, The University of Arizona, Tucson, AZ, 85721, United States.
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34
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Byers K, Bird AR, Cho HD, Linnes JC. Fully Dried Two-Dimensional Paper Network for Enzymatically Enhanced Detection of Nucleic Acid Amplicons. ACS OMEGA 2020; 5:4673-4681. [PMID: 32175514 PMCID: PMC7066650 DOI: 10.1021/acsomega.0c00115] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Accepted: 02/14/2020] [Indexed: 05/04/2023]
Abstract
Two-dimensional paper networks (2DPNs) have enabled the use of paper-based platforms to perform multistep immunoassays for detection of pathogenic diseases at the point-of-care. To date, however, detection has required the user to provide multiple signal enhancement solutions and been limited to protein targets. We solve these challenges by using mathematical equations to guide the device design of a novel 2DPN, which leverages multiple fluidic inputs to apply fully dried solutions of hydrogen peroxide, diaminobenzidine, and horseradish peroxidase signal enhancement reagents to enhance the limit-of-detection of numerous nucleic acid products. Upon rehydration in our unique 2DPN design, the dried signal enhancement solution reduces the limit-of-detection (LOD) of the device to 5 × 1011 nucleic acid copies/mL without increasing false positive detection. Our easy-to-use device retains activity after 28 days of dry storage and produces reliable signal enhancement 40 min after sample application. The fully integrated device demonstrated versatility in its ability to detect double-stranded and single-stranded DNA samples, as well as peptide nucleic acids.
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Affiliation(s)
| | - Anna R. Bird
- Purdue
University, West Lafayette, Indiana 47907, United States
- University
of Cambridge, Cambridge CB3 0AS, U.K.
| | - HyunDae D. Cho
- CrossLife
Technologies Inc., Carlsbad, California 92008, United States
| | - Jacqueline C. Linnes
- Purdue
University, West Lafayette, Indiana 47907, United States
- E-mail: . Phone: 1-765-496-1012
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35
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Kainz DM, Früh SM, Hutzenlaub T, Zengerle R, Paust N. Flow control for lateral flow strips with centrifugal microfluidics. LAB ON A CHIP 2019; 19:2718-2727. [PMID: 31276132 DOI: 10.1039/c9lc00308h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Lateral flow strips (LFSs) are widely used for clinical diagnostics. The restricted flow control of the current designs is one challenge to the development of quantitative and highly sensitive LFSs. Here, we present a flow control for LFSs using centrifugal microfluidics. In contrast to previously presented implementations of lateral flow membranes into centrifugal microfluidic cartridges, we direct the flow radially outwards through the membrane. We control the flow using only the centrifugal force, thus it is independent of membrane wetting properties and permeability. The flow rate can be decreased and increased, enabling control of incubation times for a wide variety of samples. We deduced a formula as a guideline for the integration of chromatographic membranes into centrifugal microfluidic disks to ensure that all the sample liquid flows through the membrane, hence safely avoiding bypass flow around the membrane. We verified the calculated operation conditions using different membranes, different flow rates, and different sample viscosities.
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Affiliation(s)
- Daniel M Kainz
- Laboratory for MEMS Applications, IMTEK Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany.
| | - Susanna M Früh
- Laboratory for MEMS Applications, IMTEK Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany. and Hahn-Schickard, Georges-Koehler-Allee 103, 79110 Freiburg, Germany
| | - Tobias Hutzenlaub
- Laboratory for MEMS Applications, IMTEK Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany. and Hahn-Schickard, Georges-Koehler-Allee 103, 79110 Freiburg, Germany
| | - Roland Zengerle
- Laboratory for MEMS Applications, IMTEK Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany. and Hahn-Schickard, Georges-Koehler-Allee 103, 79110 Freiburg, Germany
| | - Nils Paust
- Laboratory for MEMS Applications, IMTEK Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany. and Hahn-Schickard, Georges-Koehler-Allee 103, 79110 Freiburg, Germany
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36
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Bishop JD, Hsieh HV, Gasperino DJ, Weigl BH. Sensitivity enhancement in lateral flow assays: a systems perspective. LAB ON A CHIP 2019; 19:2486-2499. [PMID: 31251312 DOI: 10.1039/c9lc00104b] [Citation(s) in RCA: 111] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Lateral flow assays (LFAs) are rapid, inexpensive, easy-to-manufacture and -use tests widely employed in medical and environmental applications, particularly in low resource settings. Historically, LFAs have been stigmatized as having limited sensitivity. However, as their global usage expands, extensive research has demonstrated that it is possible to substantially improve LFA sensitivity without sacrificing their advantages. In this critical review, we have compiled state-of-the-art approaches to LFA sensitivity enhancement. Moreover, we have organized and evaluated these approaches from a system-level perspective, as we have observed that the advantages and disadvantages of each approach have arisen from the integrated and tightly interconnected chemical, physical, and optical properties of LFAs.
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Affiliation(s)
| | - Helen V Hsieh
- Intellectual Ventures Laboratory, Bellevue, 98007 WA, USA.
| | | | - Bernhard H Weigl
- Intellectual Ventures Laboratory, Bellevue, 98007 WA, USA. and Department of Bioengineering, University of Washington, Seattle, Washington 98195, USA.
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He X, Liu Z, Yang Y, Li L, Wang L, Li A, Qu Z, Xu F. Sensitivity Enhancement of Nucleic Acid Lateral Flow Assays through a Physical-Chemical Coupling Method: Dissoluble Saline Barriers. ACS Sens 2019; 4:1691-1700. [PMID: 31081319 DOI: 10.1021/acssensors.9b00594] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Nucleic acid lateral flow assays (NALFAs) have attracted much attention due to their rapid, robust, simple, and cost-effective features. However, the current NALFAs are still limited by low sensitivity because of the poor understanding and control of the underlying complex flow and reaction processes. Although enormous efforts have been devoted to enhancing detection sensitivity of NALFAs, developing simple NALFAs with high sensitivity remains difficult. Thus, we proposed a novel physical-chemical coupling method using dissoluble saline barriers and developed the corresponding mathematical model to better understand the underlying processes to enhance the NALFA sensitivity. Through optimizing the design parameters (e.g., saline barriers patterns, volume, and concentrations) experimentally and numerically, we achieved the highest 10-fold sensitivity enhancement for detection of nucleic acids (including HBV, Staphylococcus aureus, and salmonella as model targets) using this method. The physical-chemical coupling method offers a facile strategy for developing highly sensitive NALFAs.
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Affiliation(s)
| | - Zhi Liu
- State Key Laboratory of Engines, Tianjin University, 135 Yaguan Rd, Tianjin, 300350, P. R. China
| | | | | | - Lin Wang
- College of Medicine, Xi’an International University, Shaanxi, 710065, P. R. China
| | - Ang Li
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research and Department of Periodontology, College of Stomatology, Xi’an Jiaotong University, Xi’an 710004, P. R. China
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38
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Wang F, Altschuh P, Ratke L, Zhang H, Selzer M, Nestler B. Progress Report on Phase Separation in Polymer Solutions. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1806733. [PMID: 30856293 DOI: 10.1002/adma.201806733] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 11/22/2018] [Indexed: 05/11/2023]
Abstract
Polymeric porous media (PPM) are widely used as advanced materials, such as sound dampening foams, lithium-ion batteries, stretchable sensors, and biofilters. The functionality, reliability, and durability of these materials have a strong dependence on the microstructural patterns of PPM. One underlying mechanism for the formation of porosity in PPM is phase separation, which engenders polymer-rich and polymer-poor (pore) phases. Herein, the phase separation in polymer solutions is discussed from two different aspects: diffusion and hydrodynamic effects. For phase separation governed by diffusion, two novel morphological transitions are reviewed: "cluster-to-percolation" and "percolation-to-droplets," which are attributed to an effect that the polymer-rich and the solvent-rich phases reach the equilibrium states asynchronously. In the case dictated by hydrodynamics, a deterministic nature for the microstructural evolution during phase separation is scrutinized. The deterministic nature is caused by an interfacial-tension-gradient (solutal Marangoni force), which can lead to directional movement of droplets as well as hydrodynamic instabilities during phase separation.
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Affiliation(s)
- Fei Wang
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology (KIT), Straße am Forum 7, 76131, Karlsruhe, Germany
| | - Patrick Altschuh
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology (KIT), Straße am Forum 7, 76131, Karlsruhe, Germany
- Institute of Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestraße 30, 76133, Karlsruhe, Germany
| | - Lorenz Ratke
- Institute of Materials Research, German Aerospace Center (DLR), Linder Hoehe, 51147, Cologne, Germany
| | - Haodong Zhang
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology (KIT), Straße am Forum 7, 76131, Karlsruhe, Germany
| | - Michael Selzer
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology (KIT), Straße am Forum 7, 76131, Karlsruhe, Germany
- Institute of Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestraße 30, 76133, Karlsruhe, Germany
| | - Britta Nestler
- Institute of Applied Materials-Computational Materials Science, Karlsruhe Institute of Technology (KIT), Straße am Forum 7, 76131, Karlsruhe, Germany
- Institute of Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestraße 30, 76133, Karlsruhe, Germany
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39
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Liu Z, He X, Li A, Qu Z, Xu F. A two-dimensional mathematical model for analyzing the effects of capture probe properties on the performance of lateral flow assays. Analyst 2019; 144:5394-5403. [DOI: 10.1039/c9an00669a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lateral flow assays (LFAs) are promising candidates in biomedical diagnosis fields due to their rapid, low-cost, and portable features.
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Affiliation(s)
- Zhi Liu
- Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education
- School of Energy and Power Engineering
- Xi'an Jiaotong University
- Xi'an 710049
- P.R. China
| | - Xiaocong He
- Bioinspired Engineering and Biomechanics Center (BEBC)
- Xi'an Jiaotong University
- Xi'an 710049
- P.R. China
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education
| | - Ang Li
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research and Department of Periodontology
- College of Stomatology
- Xi'an Jiaotong University
- Xi'an 710004
- P.R. China
| | - Zhiguo Qu
- Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education
- School of Energy and Power Engineering
- Xi'an Jiaotong University
- Xi'an 710049
- P.R. China
| | - Feng Xu
- Bioinspired Engineering and Biomechanics Center (BEBC)
- Xi'an Jiaotong University
- Xi'an 710049
- P.R. China
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education
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40
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Gasperino DJ, Leon D, Lutz B, Cate DM, Nichols KP, Bell D, Weigl BH. Threshold-Based Quantification in a Multiline Lateral Flow Assay via Computationally Designed Capture Efficiency. Anal Chem 2018; 90:6643-6650. [DOI: 10.1021/acs.analchem.8b00440] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
| | - Daniel Leon
- University of Washington, Seattle, Washington 98195, United States
| | - Barry Lutz
- University of Washington, Seattle, Washington 98195, United States
| | - David M. Cate
- Intellectual Ventures, Bellevue, Washington 98005, United States
| | - Kevin P. Nichols
- Intellectual Ventures, Bellevue, Washington 98005, United States
| | - David Bell
- Intellectual Ventures, Bellevue, Washington 98005, United States
| | - Bernhard H. Weigl
- Intellectual Ventures, Bellevue, Washington 98005, United States
- University of Washington, Seattle, Washington 98195, United States
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