1
|
Alpsoy L, Sedeky AS, Rehbein U, Thedieck K, Brandstetter T, Rühe J. Particle ID: A Multiplexed Hydrogel Bead Platform for Biomedical Applications. ACS APPLIED MATERIALS & INTERFACES 2023; 15:55346-55357. [PMID: 37982803 DOI: 10.1021/acsami.3c12122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2023]
Abstract
We present a new platform based on hydrogel beads for multiplex analysis that can be fabricated, barcoded, and functionalized in a single step using a simple microfluidic assembly and a photo-cross-linking process. The beads are generated in a two-phase flow fluidic system and photo-cross-linking of the polymer in the aqueous phase by C,H insertion cross-linking (CHic). The size and shape of the hydrogel particles can be controlled over a wide range by fluidic parameters. During the fabrication of the beads, they are barcoded by using physical and optical barcoding strategies. Magnetic beads and fluorescent particles, which allow identification of the production batch number, are added simultaneously as desired, resulting in complex, multifunctional beads in a one-step reaction. As an example of biofunctionalization, Borrelia antigens were immobilized on the beads. Serum samples that originated from infected and non-infected patients could be clearly distinguished, and the sensitivity was as good as or even better than ELISA, the state of the art in clinical diagnostics. The ease of the one-step production process and the wide range of barcoding parameters offer strong advantages for multiplexed analytics in the life sciences and medical diagnostics.
Collapse
Affiliation(s)
- Lokman Alpsoy
- Department of Microsystems Engineering (IMTEK), Chemistry & Physics of Interfaces, University of Freiburg, Freiburg im Breisgau 79110, Germany
- livMatS@FIT (Freiburg Center for Interactive Materials and Bioinspired Technologies), University of Freiburg, Freiburg 79110, Germany
| | - Abanoub Selim Sedeky
- Department of Microsystems Engineering (IMTEK), Chemistry & Physics of Interfaces, University of Freiburg, Freiburg im Breisgau 79110, Germany
| | - Ulrike Rehbein
- Institute of Biochemistry, Center of Chemistry and Biomedicine, University of Innsbruck, 6020 Innsbruck, Austria
| | - Kathrin Thedieck
- Institute of Biochemistry, Center of Chemistry and Biomedicine, University of Innsbruck, 6020 Innsbruck, Austria
- Freiburg Materials Research Center FMF, Albert-Ludwigs-University of Freiburg, 79104 Freiburg, Germany
- Department of Pediatrics, Section Systems Medicine of Metabolism and Signaling, University of Groningen, University Medical Center Groningen, Groningen 9700 RB, The Netherlands
| | - Thomas Brandstetter
- Department of Microsystems Engineering (IMTEK), Chemistry & Physics of Interfaces, University of Freiburg, Freiburg im Breisgau 79110, Germany
| | - Jürgen Rühe
- Department of Microsystems Engineering (IMTEK), Chemistry & Physics of Interfaces, University of Freiburg, Freiburg im Breisgau 79110, Germany
- livMatS@FIT (Freiburg Center for Interactive Materials and Bioinspired Technologies), University of Freiburg, Freiburg 79110, Germany
| |
Collapse
|
2
|
Zeng Z, Tian J, Ren Z, Yang Y, Gong Q, Sun R, Zhang X, Liu W, Chen C. Digital droplet immunoassay based on a microfluidic chip with magnetic beads for the detection of prostate-specific antigen. J Sep Sci 2023; 46:e2300471. [PMID: 37905470 DOI: 10.1002/jssc.202300471] [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] [Received: 07/02/2023] [Revised: 10/08/2023] [Accepted: 10/13/2023] [Indexed: 11/02/2023]
Abstract
Sensitive biomarker detection techniques are beneficial for both disease diagnosis and postoperative examinations. In this study, we report an integrated microfluidic chip designed for the immunodetection of prostate-specific antigens (PSAs). The microfluidic chip is based on the three-dimensional structure of quartz capillaries. The outlet channel extends to 1.8 cm, effectively facilitating the generation of uniform droplets ranging in size from 3 to 50 μm. Furthermore, we successfully immobilized the captured antibodies onto the surface of magnetic beads using an activator, and we constructed an immunosandwich complex by employing biotinylated antibodies. A key feature of this microfluidic chip is its integration of microfluidic droplet technology advantages, such as high-throughput parallelism, enzymatic signal amplification, and small droplet size. This integration results in an exceptionally sensitive PSA detection capability, with the detection limit reduced to 7.00 ± 0.62 pg/mL.
Collapse
Affiliation(s)
- Zhaokui Zeng
- Department of Pharmacy, Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, China
| | - Jingjing Tian
- Department of Pharmacy, Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, China
| | - Zixuan Ren
- Department of Pharmacy, Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, China
| | - Ying Yang
- Department of Pharmacy, Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, China
| | - Qian Gong
- Department of Pharmacy, Hunan Cancer Hospital/The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, China
| | - Ruowei Sun
- Hunan Zaochen Nanorobot Co.Ltd, Liuyang, China
| | - Xun Zhang
- Hunan Zaochen Nanorobot Co.Ltd, Liuyang, China
| | - Wenfang Liu
- Department of Pharmacy, Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, China
| | - Chuanpin Chen
- Department of Pharmacy, Xiangya School of Pharmaceutical Sciences, Central South University, Changsha, China
| |
Collapse
|
3
|
Seder I, Coronel-Tellez R, Helalat SH, Sun Y. Fully integrated sample-in-answer-out platform for viral detection using digital reverse transcription recombinase polymerase amplification (dRT-RPA). Biosens Bioelectron 2023; 237:115487. [PMID: 37352758 DOI: 10.1016/j.bios.2023.115487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Revised: 06/02/2023] [Accepted: 06/15/2023] [Indexed: 06/25/2023]
Abstract
Recombinase polymerase amplification (RPA) is one of the most promising diagnostic methods for pathogen detection, owing to the simplified isothermal amplification technique. Using one-step digital reverse transcription RPA (dRT-RPA) to detect viral RNA provides a fast diagnosis and absolute quantification. Here, we present a chip that purifies, digitalizes, and detects viral RNA of SARS-CoV-2 in a fully automated and sensitive manner. The chip purifies the RNA using the surface charge concept of magnet bead-RNA binding, then mixes the RNA with the amplification reagents, digitalizes the amplification mixture, and performs dRT-RPA. RNA-bead complex is transported among purification buffers that are separated by an oil phase. For reagent manipulation and mixing, a magnetic valve system is integrated on the chip, where an external magnet controls the reagent direction and time of addition. Besides, a novel vacuum system is suggested to drive and regulate the reagents into two fluid systems simultaneously in ∼2 min. We also developed a cost-effective way to perform fluorescent detection for dRT-RPA on chip by using EvaGreen® dye. With integrated heating and optical detection system, the on-chip dRT-RPA presents a sample-to-answer detection platform for absolute viral RNA quantitation in 37 min and a sensitivity as low as 10 RNA copies/μL. Hence, this platform is expected to be a useful tool for accurate and automated diagnosis of infectious diseases.
Collapse
Affiliation(s)
- Islam Seder
- Department of Health Technology, Technical University of Denmark, Ørsteds Plads, DK-2800, Kgs. Lyngby, Denmark
| | - Rodrigo Coronel-Tellez
- Department of Health Technology, Technical University of Denmark, Ørsteds Plads, DK-2800, Kgs. Lyngby, Denmark
| | - Seyed Hossein Helalat
- Department of Health Technology, Technical University of Denmark, Ørsteds Plads, DK-2800, Kgs. Lyngby, Denmark
| | - Yi Sun
- Department of Health Technology, Technical University of Denmark, Ørsteds Plads, DK-2800, Kgs. Lyngby, Denmark.
| |
Collapse
|
4
|
Curtin K, Fike BJ, Binkley B, Godary T, Li P. Recent Advances in Digital Biosensing Technology. BIOSENSORS 2022; 12:bios12090673. [PMID: 36140058 PMCID: PMC9496261 DOI: 10.3390/bios12090673] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Revised: 08/16/2022] [Accepted: 08/17/2022] [Indexed: 11/27/2022]
Abstract
Digital biosensing assays demonstrate remarkable advantages over conventional biosensing systems because of their ability to achieve single-molecule detection and absolute quantification. Unlike traditional low-abundance biomarking screening, digital-based biosensing systems reduce sample volumes significantly to the fL-nL level, which vastly reduces overall reagent consumption, improves reaction time and throughput, and enables high sensitivity and single target detection. This review presents the current technology for compartmentalizing reactions and their applications in detecting proteins and nucleic acids. We also analyze existing challenges and future opportunities associated with digital biosensing and research opportunities for developing integrated digital biosensing systems.
Collapse
Affiliation(s)
- Kathrine Curtin
- Department of Mechanical and Aerospace Engineering, West Virginia University, Morgantown, WV 26506, USA
| | - Bethany J. Fike
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, WV 26506, USA
| | - Brandi Binkley
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, WV 26506, USA
| | - Toktam Godary
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, WV 26506, USA
| | - Peng Li
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, WV 26506, USA
- Correspondence:
| |
Collapse
|
5
|
Finding new edges: systems approaches to MTOR signaling. Biochem Soc Trans 2021; 49:41-54. [PMID: 33544134 PMCID: PMC7924996 DOI: 10.1042/bst20190730] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 12/23/2020] [Accepted: 01/05/2021] [Indexed: 11/17/2022]
Abstract
Cells have evolved highly intertwined kinase networks to finely tune cellular homeostasis to the environment. The network converging on the mechanistic target of rapamycin (MTOR) kinase constitutes a central hub that integrates metabolic signals and adapts cellular metabolism and functions to nutritional changes and stress. Feedforward and feedback loops, crosstalks and a plethora of modulators finely balance MTOR-driven anabolic and catabolic processes. This complexity renders it difficult — if not impossible — to intuitively decipher signaling dynamics and network topology. Over the last two decades, systems approaches have emerged as powerful tools to simulate signaling network dynamics and responses. In this review, we discuss the contribution of systems studies to the discovery of novel edges and modulators in the MTOR network in healthy cells and in disease.
Collapse
|
6
|
Gao Z, Mi Y, Wang M, Liu X, Zhang X, Gao K, Shi L, Mugisha ER, Chen H, Yan W. Hydrophobic-substrate based water-microdroplet manipulation through the long-range photovoltaic interaction from a distant LiNbO 3:Fe crystal. OPTICS EXPRESS 2021; 29:3808-3824. [PMID: 33770973 DOI: 10.1364/oe.417225] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 01/16/2021] [Indexed: 06/12/2023]
Abstract
Development of photovoltaic water-microdroplet manipulation using LN:Fe crystals has to meet the requirement of the hybrid and heating-avoided design of biological lab-on-chips. To fulfill this, we demonstrate a successful manipulation of a water microdroplet on a hydrophobic substrate by utilizing the long-range photovoltaic interaction from a distant LN:Fe crystal (see Visualization 1). The maximal manipulation distance (MMD) is found to be dependent on the laser-illumination intensity at the LN:Fe crystal and it can be tuned up to a sub-centimeter level (∼4 mm). Basing on the two-center model of light-induced charge transport in the LN:Fe crystal, we establish an analytic model to describe the force balance during the microdroplet manipulation under a long-range photovoltaic interaction. Either shortening the manipulation distance or increasing the illumination intensity can enhance the photovoltaic interaction and increase the velocity of the microdroplet being manipulated. An abrupt shape change followed by a fast repelling movement of the water microdroplet is observed under a strong photovoltaic interaction (see Visualization 2).
Collapse
|