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Lee B, Kharal G, Sreenan B, Lin C, Zeng R, Fox CA, Ellison P, Ryan RO, Brett PJ, AuCoin D, Zhu X. Alkaline surface treatment and time-resolved reading of mn-doped nanocrystal signal transducer for enhanced bioassay sensitivity. J Pharm Biomed Anal 2024; 238:115840. [PMID: 37956553 PMCID: PMC10841627 DOI: 10.1016/j.jpba.2023.115840] [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: 09/06/2023] [Revised: 10/26/2023] [Accepted: 10/31/2023] [Indexed: 11/15/2023]
Abstract
Recently, Mn-doped semiconductor nanocrystals (NCs) with high brightness, long lifetimes, and low-energy excitation are emerging for time-resolved luminescence biosensing/imaging. Following our previous work on Mn-doped NCs, in this work we developed poly(styrene-co-maleic anhydride) (PSMA)-encapsulated Mn-doped AgZnInS/ZnS NCs as signal transducers for immunoassay of capsular polysaccharide (CPS), a surface antigen and also a biomarker of Burkholderia pseudomallei which causes a fatal disease called melioidosis. To enhance the assay sensitivity, a surface treatment for PSMA-encapsulated NCs (NC-probes) was performed to promote the presence of carboxyl groups that help conjugate more anti-CPS antibodies to the surface of NC-probes and thus enhance bioassay signals. Meanwhile, time-resolved reading on the luminescence of NC-probes was adopted to minimize the assay background autofluorescence. Both strategies essentially enhance the assay signal-to-background ratio (or equivalently the assay sensitivity) by increasing the signal and decreasing the background, respectively. Through performing and comparing immunoassays with different NC-probes (with and without surface treatment) and different signal reading methods (time-resolved reading and non-time-resolved reading), it was proven that the immunoassay adopting surface-treated NC-probes and time-resolved reading achieved a lower limit-of-detection (LOD) than the ones adopting non-surface-treated NC-probes or non-time-resolved reading. Moreover, the achieved LOD is comparable to the LOD of immunoassay using enzyme horseradish peroxidase as a signal transducer.
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Affiliation(s)
- Bryan Lee
- Department of Electrical and Biomedical Engineering, University of Nevada, Reno, NV, USA; Biomedical Engineering Program, University of Nevada, Reno, NV, USA.
| | - Gita Kharal
- Department of Electrical and Biomedical Engineering, University of Nevada, Reno, NV, USA; Biomedical Engineering Program, University of Nevada, Reno, NV, USA
| | - Benjamin Sreenan
- Department of Electrical and Biomedical Engineering, University of Nevada, Reno, NV, USA; Biomedical Engineering Program, University of Nevada, Reno, NV, USA
| | - Claire Lin
- Department of Electrical and Biomedical Engineering, University of Nevada, Reno, NV, USA
| | - Ruosheng Zeng
- School of Physical Science and Technology, Guangxi University, Nanning, China
| | - Colin A Fox
- Department of Biochemistry and Molecular Biology, University of Nevada, Reno, NV, USA
| | - Patricia Ellison
- Department of Biochemistry and Molecular Biology, University of Nevada, Reno, NV, USA
| | - Robert O Ryan
- Department of Biochemistry and Molecular Biology, University of Nevada, Reno, NV, USA
| | - Paul J Brett
- Department of Microbiology and Immunology, University of Nevada, Reno School of Medicine, NV, USA
| | - David AuCoin
- Department of Microbiology and Immunology, University of Nevada, Reno School of Medicine, NV, USA
| | - Xiaoshan Zhu
- Department of Electrical and Biomedical Engineering, University of Nevada, Reno, NV, USA; Biomedical Engineering Program, University of Nevada, Reno, NV, USA.
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Gandotra R, Kuo FC, Lee MS, Lee GB. A paper-based aptamer-sandwich assay for detection of HNP 1 as a biomarker for periprosthetic joint infections on an integrated microfluidic platform. Anal Chim Acta 2023; 1281:341879. [PMID: 38783735 DOI: 10.1016/j.aca.2023.341879] [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: 09/25/2023] [Revised: 10/03/2023] [Accepted: 10/04/2023] [Indexed: 05/25/2024]
Abstract
BACKGROUND Total joint arthroplasty (TJA) has significantly improved the quality of life for millions suffering from end-stage arthritis. However, periprosthetic joint infections (PJI) remain a serious complication, necessitating extensive interventions and prolonged antimicrobial treatments. The aging population is expected to lead to a rise in TJA cases, subsequently increasing the incidence of PJI, particularly in the elderly who face higher mortality rates. Current diagnostic methods for suspected PJI, such as radiographs and biochemical markers like CRP and ESR, exhibit limited sensitivity. Therefore, there is a critical need for a specific synovial fluid biomarker assay to enhance PJI diagnosis using specific SF-based assay. RESULTS This study introduces a novel microfluidic chip with a paper-based aptamer-sandwich assay for the quantitative detection of HNP 1, a crucial PJI biomarker, in synovial fluid. The assay leverages the advantages of aptamers over antibodies, demonstrating high selectivity and affinity for target molecules. The integration of a nitrocellulose (NC) membrane onto the microfluidic platform represents a significant advancement, reducing background signals and simplifying the assay procedure without intricate procedure and pre-treatment. The NC membrane-based microfluidic device offers rapid, cost-effective, and highly sensitive detection of HNP 1, with a limit of detection of 0.5 mg L-1. The microfluidic device demonstrates exceptional performance, detecting up to four clinical samples in approximately 42 min on a single chip with 100 % accuracy, as confirmed by analysis of 12 clinical samples and comparison with "gold-standard". Moreover, the assay exhibits a wide dynamic range of 0.5-100 mg L-1, underscoring its potential as a powerful tool for PJI diagnosis in clinical settings. SIGNIFICANCE This work introduces a paper-based microfluidic system tailored for rapid HNP 1 detection using synovial fluid near joint region (and not serum via blood) for better diagnosis. The innovative paper-based aptamer-sandwich assay yields results within 42-min. Significantly, it boasts a wide dynamic range, detecting levels from an impressive 0.5 mg L-1, crucial in the 2.6 mg L-1 threshold region. This heightened sensitivity and expansive detection capability establish our assay as a leader in PJI diagnostics, promising unmatched precision and efficiency in clinical applications.
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Affiliation(s)
- Rishabh Gandotra
- Institute of NanoEngineering and Microsystems, National Tsing Hua University, Hsinchu, Taiwan
| | - Feng-Chih Kuo
- Department of Orthopedic Surgery, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan
| | - Mel S Lee
- Department of Orthopedic Surgery, Paochien Hospital, Pintung, Taiwan.
| | - Gwo-Bin Lee
- Institute of NanoEngineering and Microsystems, National Tsing Hua University, Hsinchu, Taiwan; Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan.
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Yao J, Adnan A, Wang HB. Separation mixed semen of two individuals using magnetic beads coupled ABH blood group antibody. Electrophoresis 2023; 44:1539-1547. [PMID: 37650265 DOI: 10.1002/elps.202300021] [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: 10/01/2022] [Revised: 05/22/2023] [Accepted: 06/08/2023] [Indexed: 09/01/2023]
Abstract
In sexual assault cases, one of the most common samples collected is a mixed semen stain, which is often found on the vagina, female underwear, or bed sheets. However, it is usually difficult to identify the perpetrator based on this sample alone. One technique that has been developed to address this issue is magnetic bead-based separation. This method involves using modified magnetic microspheres to capture and enrich specific target cells, in this case, sperm cells. In this study, we utilized magnetic beads coupled with ABH blood group antibody to isolate sperm cells from an individual of a single ABO blood type. Subsequently, polymerase chain reaction amplification and capillary electrophoresis were employed to perform the genotyping the short tandem repeat (STR) loci. This approach allows for the identification of different individuals in a mixed seminal stain sample from two individuals, by first separating sperm cells based on ABH antigen differences and subsequently utilizing autosomal STR typing on the enriched single blood group cells.
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Affiliation(s)
- Jun Yao
- Shanghai Key Lab of Forensic Medicine, Key Lab of Forensic Science, Ministry of Justice, China (Academy of Forensic Science), Shanghai, P. R. China
- School of Forensic Medicine, China Medical University, Shenyang, P. R. China
| | - Atif Adnan
- Department of Forensic Sciences, College of Criminal Justice, Naif Arab University for Security Sciences, Riyadh, Kingdom of Saudi Arabia
| | - Hong-Bo Wang
- Department of Anatomy, Shenyang Medical College, Shenyang, P. R. China
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4
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Gandotra R, Chen TW, Kuo FC, Lee MS, Lee GB. An aptamer-based sandwich assay for detection of alpha-defensin human neutrophil protein 1 on a microfluidic platform. Biosens Bioelectron 2023; 229:115120. [PMID: 36963324 DOI: 10.1016/j.bios.2023.115120] [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: 10/07/2022] [Revised: 01/26/2023] [Accepted: 02/01/2023] [Indexed: 02/05/2023]
Abstract
The diagnosis of periprosthetic joint infection (PJI) remains a labor-intensive and challenging issue, with life-threatening complications associated with misdiagnoses. Superior diagnostic approaches are therefore urgently needed, and synovial biomarkers are gaining substantial attention in this capacity. A new aptamer-based sandwich assay was developed where the aptamer probes specific to one such biomarker, alpha-defensin human neutrophil protein 1 (HNP 1), was integrated herein into a new microfluidic platform. The magnetic beads coated with the primary aptamer probe were able to bind the target protein with high affinity and high specificity in synovial fluid and a fluorescent-labelled secondary aptamer were further used to quantify HNP 1 in a sandwich approach. Up to four clinical samples with low volume (∼50 μL each) in a much faster assay including detection within <60 min with 100% accuracy (with totally 13 clinical samples without the need of sample pretreatment) through the use of the aptamer-based sandwich assay were automatically detected on a single chip. The wide dynamic range of this compact device, 0.5-100 mg/L, highlights its utility for future PJI diagnostics in the clinic.
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Affiliation(s)
- Rishabh Gandotra
- Institute of NanoEngineering and Microsystems, National Tsing Hua University, Hsinchu, Taiwan
| | - To-Wen Chen
- Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan
| | - Feng-Chih Kuo
- Department of Orthopedic Surgery, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung, Taiwan
| | - Mel S Lee
- Department of Orthopedic Surgery, Paochien Hospital, Pintung, Taiwan.
| | - Gwo-Bin Lee
- Institute of NanoEngineering and Microsystems, National Tsing Hua University, Hsinchu, Taiwan; Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan.
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Vedarethinam V, Jeevanandam J, Acquah C, Danquah MK. Magnetic Nanoparticles for Protein Separation and Purification. Methods Mol Biol 2023; 2699:125-159. [PMID: 37646997 DOI: 10.1007/978-1-0716-3362-5_8] [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] [Indexed: 09/01/2023]
Abstract
Proteins are essential for various functions such as brain activity and muscle contraction in humans. Even though food is a source of proteins, the bioavailability of proteins in most foods is usually limited due to matrix interaction with other biomolecules. Thus, it is essential to extract these proteins and provide them as a nutraceutical supplement to maintain protein levels and avoid protein deficiency. Hence, protein purification and extraction from natural sources are highly significant in biomedical applications. Chromatography, crude mechanical disruption, use of extractive chemicals, and electrophoresis are some of the methods applied to isolate specific proteins. Even though these methods possess several advantages, they are unable to extract specific proteins with high purity. A suitable alternative is the use of nanoparticles, which can be beneficial in protein purification and extraction. Notably, magnetic iron and iron-based nanoparticles have been employed in protein extraction processes and can be reused via demagnetization due to their magnetic property, smaller size, morphology, high surface-to-volume ratio, and surface charge-mediated property. This chapter is a summary of various magnetic nanoparticles (MNPs) that can be used for the biomolecular separation of proteins.
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Affiliation(s)
- Vadanasundari Vedarethinam
- Med-X Research Institute, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
| | - Jaison Jeevanandam
- CQM - Centro de Química da Madeira, MMRG, Universidade da Madeira, Campus da Penteada, Funchal, Portugal
| | - Caleb Acquah
- Faculty of Health Sciences, University of Ottawa, Ottawa, ON, Canada
| | - Michael K Danquah
- Chemical Engineering Department, University of Tennessee, Chattanooga, TN, USA.
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Kim SM, Kim J, Yim G, Ahn HJ, Lee M, Kim TH, Park C, Min J, Jang H, Lee T. Fabrication of a surface-enhanced Raman spectroscopy-based analytical method consisting of multifunctional DNA three-way junction-conjugated porous gold nanoparticles and Au-Te nanoworm for C-reactive protein detection. Anal Bioanal Chem 2021; 414:3197-3204. [PMID: 34350496 DOI: 10.1007/s00216-021-03559-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Revised: 06/17/2021] [Accepted: 07/16/2021] [Indexed: 01/10/2023]
Abstract
C-Reactive protein (CRP) is a biomarker of inflammatory responses and an index for assessing the risk of cardiovascular disease and estimating prognosis. In this study, we constructed a surface-enhanced Raman spectroscopy (SERS) biosensor composed of a multifunctional DNA three-way junction (DNA 3WJ), porous gold nanoplates (pAuNPs), and an Au-Te nanoworm structure for detection of CRP. The pAuNP and Au-Te nanostructures were synthesized by galvanic replacement reactions, and the morphology was confirmed by transmission electron microscopy, scanning electron microscopy, and dynamic light scattering (DLS). To generate the SERS signal, the Au-Te nanostructure was immobilized on an indium-tin oxide substrate, and the thiol-modified CRP aptamer was then self-assembled onto the modified substrate for CRP recognition. To amplify the SERS signal and identify the Raman tag, the multifunctional DNA 3WJ was conjugated with the pAuNPs, and each fragment of 3WJ was functionalized to biotin (pAuNP conjugation), methylene blue (Raman reporter), and CRP aptamer (target binding). The results were confirmed by gel electrophoresis. For conjugation between pAuNPs and DNA 3WJ, avidin was encapsulated in pAuNPs, and the conjugation structure was confirmed by DLS. The fabricated SERS biosensor showed detection limits of 2.23 pM in phosphate-buffered saline and 3.11 pM in diluted human serum. Overall, the proposed biosensor may have potential applications as a SERS biosensor platform.
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Affiliation(s)
- Soo Min Kim
- Department of Chemical Engineering, Kwangwoon University, Wolgye-dong, Nowon-gu, Seoul, 01899, Republic of Korea
| | - Jinmyeong Kim
- Department of Chemical Engineering, Kwangwoon University, Wolgye-dong, Nowon-gu, Seoul, 01899, Republic of Korea
| | - Gyeonghye Yim
- Department of Chemistry, Kwangwoon University, Wolgye-dong, Nowon-gu, Seoul, 01899, Republic of Korea
| | - Ho Jung Ahn
- Department of Chemistry, Kwangwoon University, Wolgye-dong, Nowon-gu, Seoul, 01899, Republic of Korea
| | - Myoungro Lee
- Department of Chemical Engineering, Kwangwoon University, Wolgye-dong, Nowon-gu, Seoul, 01899, Republic of Korea
| | - Tae-Hyung Kim
- School of Integrative Engineering, Chung-Ang University, Heukseok-dong, Dongjak-gu, Seoul, 06974, South Korea
| | - Chulhwan Park
- Department of Chemical Engineering, Kwangwoon University, Wolgye-dong, Nowon-gu, Seoul, 01899, Republic of Korea
| | - Junhong Min
- School of Integrative Engineering, Chung-Ang University, Heukseok-dong, Dongjak-gu, Seoul, 06974, South Korea.
| | - Hongje Jang
- Department of Chemistry, Kwangwoon University, Wolgye-dong, Nowon-gu, Seoul, 01899, Republic of Korea.
| | - Taek Lee
- Department of Chemical Engineering, Kwangwoon University, Wolgye-dong, Nowon-gu, Seoul, 01899, Republic of Korea.
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Tian Y, Li X, Cai R, Yang K, Gao Z, Yuan Y, Yue T, Wang Z. Aptamer modified magnetic nanoparticles coupled with fluorescent quantum dots for efficient separation and detection of Alicyclobacillus acidoterrestris in fruit juices. Food Control 2021. [DOI: 10.1016/j.foodcont.2021.108060] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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8
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Kokorina AA, Ponomaryova TS, Goryacheva IY. Photoluminescence-based immunochemical methods for determination of C-reactive protein and procalcitonin. Talanta 2021; 224:121837. [PMID: 33379055 DOI: 10.1016/j.talanta.2020.121837] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 10/26/2020] [Accepted: 10/28/2020] [Indexed: 12/16/2022]
Abstract
Modern, sensitive, rapid, and selective analytical methods for the detection of inflammatory markers are a crucial tool for the assessment of inflammation state, efficacy of medical intervention, and the prediction of future diseases. Their development requires understanding of current state for point-of-care testing of inflammatory markers and identification of their crucial drawbacks. This review summarizes the progress in the application of luminescent labels for immunoassays. The luminescent labels became more popular in the latest decade due to their high sensitivity, selectivity, and robustness. This review presents a constructive analysis of different luminescent labels such as fluorescent organic dyes, quantum dots, long-lived emissive nanoparticles, and up-converting nanocrystals, as well as a range of the strategies for inflammatory markers determination. The advantages and disadvantages of all classes of luminescent labels are demonstrated, and the strategies of labels modification for their improvement are discussed. The current approaches for the creation of luminescent probes and robust assays are also highlighted.
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Affiliation(s)
- Alina A Kokorina
- Saratov State University, Astrakhanskaya Street 83, 410012, Saratov, Russia.
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Gallian B, Zaeimian MS, Hau D, AuCoin D, Zhu X. A Highly Sensitive Time-Gated Fluorescence Immunoassay Platform Using Mn-Doped AgZnInS/ZnS Nanocrystals as Signal Transducers. FRONTIERS IN PHYSICS 2021; 8:625424. [PMID: 33816457 PMCID: PMC8009851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In this work, a time-gated immunoassay platform using low-energy excitable and fluorescence long-lived Mn:AgZnInS/ZnS nanocrystals as signal transducers was developed and applied to the detection of the capsular polysaccharide (CPS) of Burkholderia pseudomallei, a Gram-negative bacterium that is the causative agent of melioidosis. CPS is a high molecular weight antigen displayed and is shed from the outer membrane of B. pseudomallei. The immunoassay using the time-gated platform presents a limit of detection at around 23 pg/ml when CPS is spiked in human serum.
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Affiliation(s)
- Brandon Gallian
- Department of Electrical and Biomedical Engineering, University of Nevada, Reno, NV, United States
- Biomedical Engineering Program, University of Nevada, Reno, NV, United States
| | - Masoumeh Saber Zaeimian
- Department of Electrical and Biomedical Engineering, University of Nevada, Reno, NV, United States
- Biomedical Engineering Program, University of Nevada, Reno, NV, United States
| | - Derrick Hau
- Department of Microbiology and Immunology, School of Medicine, University of Nevada, Reno, NV, United States
| | - David AuCoin
- Department of Microbiology and Immunology, School of Medicine, University of Nevada, Reno, NV, United States
| | - Xiaoshan Zhu
- Department of Electrical and Biomedical Engineering, University of Nevada, Reno, NV, United States
- Biomedical Engineering Program, University of Nevada, Reno, NV, United States
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Jarockyte G, Karabanovas V, Rotomskis R, Mobasheri A. Multiplexed Nanobiosensors: Current Trends in Early Diagnostics. SENSORS (BASEL, SWITZERLAND) 2020; 20:E6890. [PMID: 33276535 PMCID: PMC7729484 DOI: 10.3390/s20236890] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 11/28/2020] [Accepted: 11/30/2020] [Indexed: 02/07/2023]
Abstract
The ever-growing demand for fast, cheap, and reliable diagnostic tools for personalised medicine is encouraging scientists to improve existing technology platforms and to create new methods for the detection and quantification of biomarkers of clinical significance. Simultaneous detection of multiple analytes allows more accurate assessment of changes in biomarker expression and offers the possibility of disease diagnosis at the earliest stages. The concept of multiplexing, where multiple analytes can be detected in a single sample, can be tackled using several types of nanomaterial-based biosensors. Quantum dots are widely used photoluminescent nanoparticles and represent one of the most frequent choices for different multiplex systems. However, nanoparticles that incorporate gold, silver, and rare earth metals with their unique optical properties are an emerging perspective in the multiplexing field. In this review, we summarise progress in various nanoparticle applications for multiplexed biomarkers.
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Affiliation(s)
- Greta Jarockyte
- Department of Regenerative Medicine, State Research Institute Centre for Innovative Medicine, Santariskiu 5, LT-08406 Vilnius, Lithuania; (G.J.); (A.M.)
- Biomedical Physics Laboratory, National Cancer Institute, Baublio 3b, LT-08406 Vilnius, Lithuania;
| | - Vitalijus Karabanovas
- Department of Regenerative Medicine, State Research Institute Centre for Innovative Medicine, Santariskiu 5, LT-08406 Vilnius, Lithuania; (G.J.); (A.M.)
- Biomedical Physics Laboratory, National Cancer Institute, Baublio 3b, LT-08406 Vilnius, Lithuania;
| | - Ricardas Rotomskis
- Biomedical Physics Laboratory, National Cancer Institute, Baublio 3b, LT-08406 Vilnius, Lithuania;
| | - Ali Mobasheri
- Department of Regenerative Medicine, State Research Institute Centre for Innovative Medicine, Santariskiu 5, LT-08406 Vilnius, Lithuania; (G.J.); (A.M.)
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, FI-90014 Oulu, Finland
- Departments of Orthopedics, Rheumatology and Clinical Immunology, University Medical Center Utrecht, 3508 GA Utrecht, The Netherlands
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Molinero-Fernández Á, Arruza L, López MÁ, Escarpa A. On-the-fly rapid immunoassay for neonatal sepsis diagnosis: C-reactive protein accurate determination using magnetic graphene-based micromotors. Biosens Bioelectron 2020; 158:112156. [PMID: 32275206 DOI: 10.1016/j.bios.2020.112156] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 03/05/2020] [Accepted: 03/15/2020] [Indexed: 01/19/2023]
Abstract
Based on the exceptional and new opened biosensing possibilities of self-propelled micromotors, a micromotor-based immunoassay (MIm) has smartly been designed for C-reactive protein (CRP) determination in plasma of preterm infants with sepsis suspicion. The design of the micromotors involved the electrosynthesis of a carbon-based outer layer (for antibody functionalization), an intermediate Ni layer (for magnetic guidance and stopped flow operations) and PtNPs inner catalytic layer (for catalytic bubble propulsion). Micromotors biofunctionalization on the outer layer (using carbon black (CB), reduced graphene oxide (rGO) and multi-walled carbon nanotubes (MWCNTs), and biocompatible propulsion capabilities, were carefully studied. Magnetic rGO/Ni/PtNPs micromotors exhibited the most efficient and reproducible (CV = 9%) anti-CRP functionalization, controlled stopped-flow operations as well as efficient bubble propulsion (1% H2O2, 1,5% NaCh, speed 140 μm s-1). Analytical performance of MIm was excellent, allowing the direct (without dilution), sensitive (LOD = 0.80 μg/mL), and accurate CRP determination (Er = 1%) in hardly available preterm babies' plasma samples with suspected sepsis using very low volumes (<10 μL) and in just 5 min of on-the-fly bioassay. Overall, the results obtained allowed the fast and reliable sepsis diagnostics in preterm babies' individuals with suspected sepsis, not only proving the usefulness of the approach as its potential utilization as point-of-care device for clinical analysis but drawing new horizons in extremely low sample volumes-based diagnostics.
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Affiliation(s)
- Águeda Molinero-Fernández
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University of Alcala, Ctra. Madrid-Barcelona, Km. 33.600, 28871, Alcalá de Henares, Madrid, Spain
| | - Luis Arruza
- Division of Neonatology, Child and Teenager Institute, San Carlos Clinic Hospital-IdISSC, Madrid, Spain
| | - Miguel Ángel López
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University of Alcala, Ctra. Madrid-Barcelona, Km. 33.600, 28871, Alcalá de Henares, Madrid, Spain; Chemical Research Institute "Andres M. Del Rio", University of Alcala, Madrid, Spain.
| | - Alberto Escarpa
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University of Alcala, Ctra. Madrid-Barcelona, Km. 33.600, 28871, Alcalá de Henares, Madrid, Spain; Chemical Research Institute "Andres M. Del Rio", University of Alcala, Madrid, Spain.
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12
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Meng L, Nawaz MAH, Huang X, Ma Y, Li Y, Zhou H, Yu C. The use of aggregation-induced emission probe doped silica nanoparticles for the immunoassay of human epididymis protein 4. Analyst 2019; 144:6136-6142. [PMID: 31536063 DOI: 10.1039/c9an01265f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A sensitive sandwich immunoassay for the sensing of human epididymis protein 4 (HE4) is developed based on aggregation-induced emission probe doped silica nanoparticles. Fluorescent silica nanoparticles (TSiO2) with excellent performance were prepared using a tetraphenylethylene based probe (TPE-C4-4) to produce a controlled aggregation effect, and HE4 was detected using antibody-functionalized fluorescent silica nanoparticles. The fluorescent silica nanoparticles possess good photophysical properties. The TSiO2 NPs were surface modified with carboxyl groups, and the antibody was covalently attached onto the surface of the nanoparticles. In addition, magnetic beads were modified with N-hydroxysulfosuccinimide sodium salt (NHS) on their surface, capable of forming stable peptide bonds with the antibody. TSiO2 NPs modified by an antibody and the magnetic beads modified by an antibody were used for the sandwich immunoassay for HE4 protein. The assay is quite sensitive and selective. The detection limit of HE4 is estimated to be 40 pM. The assay shows promising applications for the early diagnosis of ovarian cancer and the development of ovarian cancer-related drugs.
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Affiliation(s)
- Lianjie Meng
- School of Changchun University of Science and Technology, Changchun, 130022, P. R. China.
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Roth S, Hadass O, Cohen M, Verbarg J, Wilsey J, Danielli A. Improving the Sensitivity of Fluorescence-Based Immunoassays by Photobleaching the Autofluorescence of Magnetic Beads. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1803751. [PMID: 30411493 DOI: 10.1002/smll.201803751] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 10/24/2018] [Indexed: 05/11/2023]
Abstract
In fluorescence-based assays, usually a target molecule is captured using a probe conjugated to a capture surface, and then detected using a second fluorescently labeled probe. One of the most common capture surfaces is a magnetic bead. However, magnetic beads exhibit strong autofluorescence, which often overlaps with the emission of the reporter fluorescent dyes and limits the analytical performance of the assay. Here, several widely used magnetic beads are photobleached and their autofluorescence is reduced to 1% of the initial value. Their autofluorescence properties, including their photobleaching decay rates and autofluorescence spectra pre- and post-photobleaching, and the stability of the photobleaching over a period of two months are analyzed. The photobleached beads are stable over time and their surface functionality is retained. In a high-sensitivity LX-200 system using photobleached magnetic beads, human interleukin-8 is detected with a threefold improvement in detection limit and signal-to-noise ratio over results achievable with nonbleached beads. Since many contemporary immunoassays rely on magnetic beads as capture surfaces, prebleaching the beads may significantly improve the analytical performance of these assays. Moreover, nonmagnetic beads with low autofluorescence are also successfully photobleached, suggesting that photobleaching can be applied to various capture surfaces used in fluorescence-based assays.
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Affiliation(s)
- Shira Roth
- Faculty of Engineering, Bar-Ilan University, Max and Anna Webb Street, Ramat Gan, 5290002, Israel
| | - Orr Hadass
- MagBiosense, Inc., 4320 Forest Park Ave., Suite 304, St. Louis, MO, 63108, USA
| | - Meir Cohen
- Faculty of Engineering, Bar-Ilan University, Max and Anna Webb Street, Ramat Gan, 5290002, Israel
| | - Jasenka Verbarg
- MagBiosense, Inc., 4320 Forest Park Ave., Suite 304, St. Louis, MO, 63108, USA
| | - Jennifer Wilsey
- MagBiosense, Inc., 4320 Forest Park Ave., Suite 304, St. Louis, MO, 63108, USA
| | - Amos Danielli
- Faculty of Engineering, Bar-Ilan University, Max and Anna Webb Street, Ramat Gan, 5290002, Israel
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Wang S, Li JJ, Lv Y, Wu R, Xing M, Shen H, Wang H, Li LS, Chen X. Synthesis of Reabsorption-Suppressed Type-II/Type-I ZnSe/CdS/ZnS Core/Shell Quantum Dots and Their Application for Immunosorbent Assay. NANOSCALE RESEARCH LETTERS 2017; 12:380. [PMID: 28582961 PMCID: PMC5457375 DOI: 10.1186/s11671-017-2135-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 05/10/2017] [Indexed: 06/07/2023]
Abstract
We report a phosphine-free one-pot method to synthesize ZnSe/CdS/ZnS core-shell quantum dots (QDs) with composite type-II/type-I structures and consequent reabsorption suppression properties. The as-synthesized QDs possess high efficient red emission (with quantum yield of 82%) and high optical stability. Compared to type-I QDs, the ZnSe/CdS/ZnS QDs show larger Stokes shift and lower reabsorption which can reduce the emission loss and improve the level of fluorescence output. The ZnSe/CdS/ZnS QDs are used as fluorescent labels to exploit their application in fluorescence-linked immunosorbent assay (FLISA) for the first time in the detection of C-reactive protein (CRP) with a limit of detection (LOD) of 0.85 ng/mL, which is more sensitive than that of CdSe/ZnS type-I QDs based FLISA (1.00 ng/mL). The results indicate that the ZnSe/CdS/ZnS type-II/type-I QDs may be good candidates for applications in biomedical information detection.
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Affiliation(s)
- Sheng Wang
- National & Local United Engineering Laboratory for Chinese Herbal Medicine Breeding and Cultivation, School of Life Sciences, Jilin University, Changchun City, 130021 People’s Republic of China
| | - Jin Jie Li
- Key Laboratory for Special Functional Materials, Henan University, Kaifeng, 475004 People’s Republic of China
| | - Yanbing Lv
- Key Laboratory for Special Functional Materials, Henan University, Kaifeng, 475004 People’s Republic of China
| | - Ruili Wu
- Key Laboratory for Special Functional Materials, Henan University, Kaifeng, 475004 People’s Republic of China
| | - Ming Xing
- National & Local United Engineering Laboratory for Chinese Herbal Medicine Breeding and Cultivation, School of Life Sciences, Jilin University, Changchun City, 130021 People’s Republic of China
| | - Huaibin Shen
- Key Laboratory for Special Functional Materials, Henan University, Kaifeng, 475004 People’s Republic of China
| | - Hongzhe Wang
- Key Laboratory for Special Functional Materials, Henan University, Kaifeng, 475004 People’s Republic of China
| | - Lin Song Li
- Key Laboratory for Special Functional Materials, Henan University, Kaifeng, 475004 People’s Republic of China
| | - Xia Chen
- National & Local United Engineering Laboratory for Chinese Herbal Medicine Breeding and Cultivation, School of Life Sciences, Jilin University, Changchun City, 130021 People’s Republic of China
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15
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Zhang Y, Rojas OJ. Immunosensors for C-Reactive Protein Based on Ultrathin Films of Carboxylated Cellulose Nanofibrils. Biomacromolecules 2017; 18:526-534. [PMID: 28036163 DOI: 10.1021/acs.biomac.6b01681] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
C-reactive protein (CRP) is an acute phase protein that has been widely used as a predictor of cardiovascular diseases. We report herein the synthesis of immunosensors based on carboxylated cellulose nanofibrils (CNF) for CRP detection, as demonstrated by quartz crystal microgravimetry (QCM). QCM sensors carrying ultrathin films of carboxylated CNF were prepared by using two protocols: (i) spin coating of CNF on the sensors followed by carboxylation via in situ oxidation with 2,2,6,6-tetramethylpiperidine 1-oxyl and (ii) carboxymethylation of CNF in aqueous dispersion followed by spin coating deposition on the sensors. Protein A was conjugated to the carboxylated CNF via N-(3-(Dimethylamino)propyl)-N'-ethylcarbodiimide hydrochloride/N-hydroxysuccinimide and used as a ligand for oriented immobilization of anti C-reactive protein (anti-CRP). The different carboxyl group density of the two oxidized CNF surfaces influenced Protein A binding and, subsequently, the available immobilized anti-CRP molecules. The detection efficiency for CRP, specificity, and concentration range displayed by the carboxylated CNF-based immunosensors coupled with oriented and unoriented anti-CRP were determined and compared.
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Affiliation(s)
- Yanxia Zhang
- Institute for Cardiovascular Science and Department of Cardiovascular Surgery of the First Affiliated Hospital, Soochow University , Suzhou, Jiangsu 215007, People's Republic of China
| | - Orlando J Rojas
- Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University , FI-00076 Aalto, Finland.,Departments of Forest Biomaterials and Chemical and Biomolecular Engineering, North Carolina State University , Raleigh, North Carolina 27695, United States
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16
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Rapid and sensitive detection of HIV-1 p24 antigen by immunomagnetic separation coupled with catalytic fluorescent immunoassay. Anal Bioanal Chem 2016; 408:6115-21. [PMID: 27351993 DOI: 10.1007/s00216-016-9722-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Revised: 06/07/2016] [Accepted: 06/14/2016] [Indexed: 01/05/2023]
Abstract
In this study, a system of magnetic beads (MBs) coupled with catalytic fluorescent immunoassay for rapid and sensitive determination of HIV-1 capsid antigen p24 was developed. p24 was captured by antibody immobilized MBs, and the detection antibody was linked to horseradish peroxidase (HRP) through biotin-streptavidin recognition, catalyzing the oxidation of o-phenylenediamine (OPD) and hydrogen peroxide to produce a fluorescent product. This is the first reported utilization of the fluorescence of OPD oxidation product catalyzed by HRP for immunoassay. Optimization of conditions afforded a low detection limit of 0.5 pg/mL (3σ) for p24 with a linear range of 1.4-90.0 pg/mL. The assay exhibited good reproducibility with a relative standard deviation (RSD) of 4.4 %, 4.7 %, and 5.0 % for detecting 1.4 pg/mL, 22.5 pg/mL, and 45.0 pg/mL p24, respectively. The assay can be completed in less than 90 min. Moreover, the proposed method was successfully applied to detect p24 in spiked serum. This method overcomes the interference of MBs to the fluorescence signal and demonstrated higher sensitivity for detection of p24 than conventional ELISA kits. The system could be applied for detecting other antigens with high sensitivity, rapidity, specificity, and simple operation. Graphical Abstract A rapid and sensitive biosensing method coupling immunomagnetic separation and catalytic fluorescence for determination of HIV-1 p24 has been developed.
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17
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Wu S, Liu L, Li G, Jing F, Mao H, Jin Q, Zhai W, Zhang H, Zhao J, Jia C. Multiplexed detection of lung cancer biomarkers based on quantum dots and microbeads. Talanta 2016; 156-157:48-54. [PMID: 27260434 DOI: 10.1016/j.talanta.2016.05.005] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 04/25/2016] [Accepted: 05/01/2016] [Indexed: 01/28/2023]
Abstract
We have developed a multiplexed fluoroimmunoassay of three lung cancer biomarkers based on multicolor quantum dots (QDs) as detection elements and micro-magnetic beads as immune carriers. QDs have the ability to simplify multiplexed analysis. In our method, the fluorescent signals derived from three cross-talk-free QD conjugated probes with emission maxima at 525, 585 and 625nm could be analyzed to determine the concentrations of the target proteins. With this system, fragments of cytokeratin 19 (CYRFA 21-1), carcinoembryonic antigen (CEA), and neuron-specific enolase (NSE), were simultaneously detected in a single sample with a low detection limit down to the 1.0ng/mL level (364pg/mL for CYRFA 21-1, 38pg/mL for CEA, 370pg/mL for NSE in a single detection). Additional advantages of the presented method include ease of operation, low cost, and a very low sample volume (20µL).
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Affiliation(s)
- Simin Wu
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China; School of Life Science, East China Normal University, Shanghai 200241, China
| | - Lifen Liu
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China
| | - Gong Li
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China
| | - Fengxiang Jing
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China
| | - Hongju Mao
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China
| | - Qinghui Jin
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China
| | - Wanyin Zhai
- Biomaterials and Tissue Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
| | - Hongfeng Zhang
- School of Life Science, East China Normal University, Shanghai 200241, China.
| | - Jianlong Zhao
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China
| | - Chunping Jia
- State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, 865 Changning Road, Shanghai 200050, China.
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18
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Liu W, Zhang A, Xu G, Wei F, Yang J, Hu Q. Manganese modified CdTe/CdS quantum dots as an immunoassay biosensor for the detection of Golgi protein-73. J Pharm Biomed Anal 2016; 117:18-25. [DOI: 10.1016/j.jpba.2015.08.020] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2015] [Revised: 08/09/2015] [Accepted: 08/14/2015] [Indexed: 01/01/2023]
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19
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Verification of antibody labelling efficiency as an important step in ELISA/QLISA development. MONATSHEFTE FUR CHEMIE 2015. [DOI: 10.1007/s00706-015-1598-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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20
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Kim C, Searson PC. Magnetic bead-quantum dot assay for detection of a biomarker for traumatic brain injury. NANOSCALE 2015; 7:17820-17826. [PMID: 26457768 DOI: 10.1039/c5nr05608j] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Current diagnostic methods for traumatic brain injury (TBI), which accounts for 15% of all emergency room visits, are limited to neuroimaging modalities. The challenges of accurate diagnosis and monitoring of TBI have created the need for a simple and sensitive blood test to detect brain-specific biomarkers. Here we report on an assay for detection of S100B, a putative biomarker for TBI, using antibody-conjugated magnetic beads for capture of the protein, and antibody-conjugated quantum dots for optical detection. From Western Blot, we show efficient antigen capture and concentration by the magnetic beads. Using magnetic bead capture and quantum dot detection in serum samples, we show a wide detection range and detection limit below the clinical cut-off level.
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Affiliation(s)
- Chloe Kim
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA.
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21
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Zhang P, Bao Y, Draz MS, Lu H, Liu C, Han H. Rapid and quantitative detection of C-reactive protein based on quantum dots and immunofiltration assay. Int J Nanomedicine 2015; 10:6161-73. [PMID: 26491289 PMCID: PMC4598213 DOI: 10.2147/ijn.s89307] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Convenient and rapid immunofiltration assays (IFAs) enable on-site "yes" or "no" determination of disease markers. However, traditional IFAs are commonly qualitative or semi-quantitative and are very limited for the efficient testing of samples in field diagnostics. Here, we overcome these limitations by developing a quantum dots (QDs)-based fluorescent IFA for the quantitative detection of C-reactive proteins (CRP). CRP, the well-known diagnostic marker for acute viral and bacterial infections, was used as a model analyte to demonstrate performance and sensitivity of our developed QDs-based IFA. QDs capped with both polyethylene glycol (PEG) and glutathione were used as fluorescent labels for our IFAs. The presence of the surface PEG layer, which reduced the non-specific protein interactions, in conjunction with the inherent optical properties of QDs, resulted in lower background signal, increased sensitivity, and ability to detect CRP down to 0.79 mg/L with only 5 µL serum sample. In addition, the developed assay is simple, fast and can quantitatively detect CRP with a detection limit up to 200 mg/L. Clinical test results of our QD-based IFA are well correlated with the traditional latex enhance immune-agglutination aggregation. The proposed QD-based fluorescent IFA is very promising, and potentially will be adopted for multiplexed immunoassay and in field point-of-care test.
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Affiliation(s)
- Pengfei Zhang
- Center for Translational Medicine, Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Yan Bao
- Center for Translational Medicine, Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Mohamed Shehata Draz
- Zhejiang-California International Nanosystems Institute, Zhejiang University, Hangzhou, Zhejiang, People's Republic of China ; Faculty of Science, Tanta University, Tanta, Egypt
| | - Huiqi Lu
- Center for Translational Medicine, Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Chang Liu
- Center for Translational Medicine, Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
| | - Huanxing Han
- Center for Translational Medicine, Changzheng Hospital, Second Military Medical University, Shanghai, People's Republic of China
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22
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Sun H, Wang M, Wang J, Tian M, Wang H, Sun Z, Huang P. Development of magnetic separation and quantum dots labeled immunoassay for the detection of mercury in biological samples. J Trace Elem Med Biol 2015; 30:37-42. [PMID: 25744508 DOI: 10.1016/j.jtemb.2015.01.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 12/14/2014] [Accepted: 01/14/2015] [Indexed: 10/24/2022]
Abstract
A rapid and sensitive immunoassays of mercury (Hg) in biological samples was developed using quantum dots (QDs) and magnetic beads (MBs) as fluorescent and separated probes, respectively. A monoclonal antibody (mAb) that recognizes an Hg detection antigen (BSA-DTPA-Hg) complex was produced by the injection of BALB/c mice with an Hg immunizing antigen (KLH-DTPA-Hg). Then the ascites monoclonal antibodies were purified. The Hg monoclonal antibody (Hg-mAb) is conjugated with MBs to separate Hg from biological samples, and the other antibody, which is associated with QDs, is used to detect the fluorescence. The Hg in biological samples can be quantified using the relationship between the QDs fluorescence intensity and the concentration of Hg in biological samples following magnetic separation. In this method, the detection linear range is 1-1000ng/mL, and the minimum detection limit is 1ng/mL. The standard addition recovery rate was 94.70-101.18%. The relative standard deviation values were 2.76-7.56%. Furthermore, the Hg concentration can be detected in less than 30min, the significant interference of other heavy metals can be avoided, and the simultaneous testing of 96 samples can be performed. These results indicate that the method could be used for rapid monitoring Hg in the body.
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Affiliation(s)
- Hubo Sun
- Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, No. 10 Xitoutiao, You An Men, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, No. 10 Xitoutiao, You An Men, Beijing 100069, China
| | - Mengmeng Wang
- Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, No. 10 Xitoutiao, You An Men, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, No. 10 Xitoutiao, You An Men, Beijing 100069, China
| | - Jilong Wang
- Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, No. 10 Xitoutiao, You An Men, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, No. 10 Xitoutiao, You An Men, Beijing 100069, China
| | - Mi Tian
- Medical Experiment and Test Center, Capital Medical University, No. 10 Xitoutiao, You An Men, Beijing 100069, China
| | - Hui Wang
- Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, No. 10 Xitoutiao, You An Men, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, No. 10 Xitoutiao, You An Men, Beijing 100069, China
| | - Zhiwei Sun
- Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, No. 10 Xitoutiao, You An Men, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, No. 10 Xitoutiao, You An Men, Beijing 100069, China
| | - Peili Huang
- Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, No. 10 Xitoutiao, You An Men, Beijing 100069, China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, No. 10 Xitoutiao, You An Men, Beijing 100069, China.
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23
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Wang G, Leng Y, Guo H, Song S, Jiang Z, Yuan X, Wang X, Sun K, Sun K, Dou H. Efficient preparation of magnetic quantum dot barcodes. J Mater Chem B 2014; 2:8310-8313. [PMID: 32262000 DOI: 10.1039/c4tb01672f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Quantum dot (QD)-encoded magnetic barcodes were prepared through a highly efficient membrane emulsification-solvent evaporation approach. Our study demonstrates the great potential of these QD-encoded magnetic barcodes for both magnetic separation and multiplex suspension assays.
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Affiliation(s)
- Gang Wang
- The State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China.
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24
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Phurimsak C, Tarn MD, Peyman SA, Greenman J, Pamme N. On-Chip Determination of C-Reactive Protein Using Magnetic Particles in Continuous Flow. Anal Chem 2014; 86:10552-9. [DOI: 10.1021/ac5023265] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chayakom Phurimsak
- Department
of Chemistry, The University of Hull, Cottingham Road, Hull, HU6 7RX, United Kingdom
| | - Mark D. Tarn
- Department
of Chemistry, The University of Hull, Cottingham Road, Hull, HU6 7RX, United Kingdom
| | - Sally A. Peyman
- Department
of Chemistry, The University of Hull, Cottingham Road, Hull, HU6 7RX, United Kingdom
| | - John Greenman
- School
of Biological, Biomedical and Environmental Sciences, The University of Hull, Cottingham Road, Hull, HU6 7RX, United Kingdom
| | - Nicole Pamme
- Department
of Chemistry, The University of Hull, Cottingham Road, Hull, HU6 7RX, United Kingdom
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25
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Comparison of novel and familiar commercial kits for detection of C-reactive protein levels. World J Microbiol Biotechnol 2014; 30:2295-8. [DOI: 10.1007/s11274-014-1653-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Accepted: 04/12/2014] [Indexed: 10/25/2022]
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26
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Watanabe S, Hagihara K, Tsukagoshi K, Hashimoto M. Microbead-Based Ligase Detection Reaction Assay Using a Molecular Beacon Probe for the Detection of Low-Abundance Point Mutations. Anal Chem 2013; 86:900-6. [DOI: 10.1021/ac403531x] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Sho Watanabe
- Department of Chemical Engineering
and Materials Science, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Kenta Hagihara
- Department of Chemical Engineering
and Materials Science, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Kazuhiko Tsukagoshi
- Department of Chemical Engineering
and Materials Science, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Masahiko Hashimoto
- Department of Chemical Engineering
and Materials Science, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
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27
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Use of Magnetic Nanoparticles and a Microplate Reader with Fluorescence Detection to Detect C-reactive Protein. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201300377] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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28
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Kergaravat SV, Beltramino L, Garnero N, Trotta L, Wagener M, Fabiano SN, Pividori MI, Hernandez SR. Magneto immunofluorescence assay for diagnosis of celiac disease. Anal Chim Acta 2013; 798:89-96. [DOI: 10.1016/j.aca.2013.09.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2013] [Revised: 09/02/2013] [Accepted: 09/05/2013] [Indexed: 12/01/2022]
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29
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Pan FG, Fang Z, Meng RZ, Qin Y, Ju W, Liu J, Wu H. Improving the Sensitivity of Fluorescent Microsphere Immunoassays for the Simultaneous Detection of Foodborne Pathogens Using Dimethylacetamide. ANAL LETT 2013. [DOI: 10.1080/00032719.2013.798793] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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30
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Park H, Lee JW, Hwang MP, Lee KH. Quantification of cardiovascular disease biomarkers via functionalized magnetic beads and on-demand detachable quantum dots. NANOSCALE 2013; 5:8609-8615. [PMID: 23893124 DOI: 10.1039/c3nr02357e] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Cardiovascular disease (CVD) is a potent cause of mortality in both advanced and developing countries. While soluble CD40L (sCD40L) has been implicated as a correlative factor among CVD patients, methods to quantify sCD40L are not yet well-established. In this paper, we present an ability to separate and quantify sCD40L via a simple immunomagnetic assay. Composed of functionalized magnetic beads conferred with directionality and on-demand detachable quantum dots for subsequent optical analysis, our system utilizes the competitive nature of imidazole and nickel ions for histidine. In essence, we demonstrate the capacity to effectively separate and detect sCD40L within a clinically relevant range that contains the cut-off value for acute coronary disease. While sCD40L was used to conduct this study, we envision the use of our system for the separation and quantification of other biomarkers.
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Affiliation(s)
- Hoyoung Park
- Center for Biomaterials, Biomedical Research Institute, Korea Institute of Science and Technology (KIST), Seoul 136-791, Republic of Korea
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31
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Park H, Hwang MP, Lee JW, Choi J, Lee KH. Harnessing immunomagnetic separation and quantum dot-based quantification capacities for the enumeration of absolute levels of biomarker. NANOTECHNOLOGY 2013; 24:285103. [PMID: 23787774 DOI: 10.1088/0957-4484/24/28/285103] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The field of biomarker quantification has experienced a growth parallel to the discovery of new materials. In this paper, we propose an innovative system for the separation and quantification of biomarkers using a simple magnetic bead (MB)-quantum dot (QD) sandwich assay. The basis of the system lies in the interaction between histidine residues on protein G and Ni ions on QDs, and the use of imidazole to selectively detach QDs bound to target biomarkers, in effect enumerating the absolute number of biomarker units. We used C-reactive protein (CRP) as a proof-of-concept and demonstrated a detection sensitivity of 82.5 fmoles in 50 μl of sample volume, a commonly used analytical volume (e.g. ELISA). Although CRP was used as a model to conduct this study, the sensitivity and simplicity of this detachable system make it a viable approach in the quantification of other target analytes.
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Affiliation(s)
- Hoyoung Park
- Center for Biomaterials Biomedical Research Institute, Korea Institute of Science and Technology-KIST, Seoul 136-791, Republic of Korea
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32
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Algarra M, Gomes D, Esteves da Silva JCG. Current analytical strategies for C-reactive protein quantification in blood. Clin Chim Acta 2012; 415:1-9. [PMID: 22975530 DOI: 10.1016/j.cca.2012.09.007] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2012] [Revised: 09/02/2012] [Accepted: 09/06/2012] [Indexed: 01/17/2023]
Abstract
The measurement of serum C-reactive protein (CRP) levels has been given particular interest as a marker of inflammation associated with cardiovascular diseases. CRP belongs to the pentraxin family of proteins and the routine clinical analysis of CRP in blood samples is used as an important factor in primary prevention programmes together with causative and predisposing factors. This review focuses on the most representative methodologies and strategies for CRP detection and quantification that have been recently proposed, as well as reviewing those that are currently being developed for the specific, sensitive, inexpensive and high-throughput blood analysis of this protein.
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Affiliation(s)
- Manuel Algarra
- Centro de Geologia, Departamento de Geociências, Ambiente e Ordenamento do Território do Porto, Faculdade de Ciências, Universidade do Porto, Porto, Portugal.
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CdSe and ZnSe quantum dots capped with PEA for screening C-reactive protein in human serum. Talanta 2012; 93:411-4. [DOI: 10.1016/j.talanta.2012.01.042] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2011] [Revised: 01/16/2012] [Accepted: 01/19/2012] [Indexed: 11/20/2022]
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Wang G, Zhang P, Dou H, Li W, Sun K, He X, Han J, Xiao H, Li Y. Efficient incorporation of quantum dots into porous microspheres through a solvent-evaporation approach. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:6141-6150. [PMID: 22428794 DOI: 10.1021/la300066c] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Quantum dot (QD)-encoded microspheres play an important role in suspension arrays by acting as supports for various reactions between biomolecules. With regard to QD-encoded microspheres utilized in suspension arrays, three key requirements are controllable size, abundant surface functional groups, and especially excellent fluorescence properties. In this paper, narrowly dispersed poly(styrene-co-divinylbenzene-co-methylacrylic acid) (PSDM) microspheres with specific size, surface carboxyl groups, and porous structures were synthesized by seeded copolymerization. In order to improve the incorporation efficiency of QDs within microspheres, we developed a swelling-evaporation approach in which the swelling process was combined with gradual evaporation of the solvent and thus gradual concentration of QDs in the dispersion solution. This approach was demonstrated to be an efficient method for improving the fluorescence intensity of resultant microspheres compared with the use of swelling alone. Moreover, the porous structure was shown to aid the penetration of QDs into the interiors of the microspheres. Through this approach, microspheres encoded with either single or multiple wavelength-emitting QDs were fabricated effectively. The suspension immunoassays were then founded based on the QD-encoded microspheres, by coating mouse antihuman chorionic gonadotropin as the probe for goat antimouse IgG detection. The positive results determined by Luminex 100 and the low cytotoxicity of the QD-encoded microspheres demonstrated their great potential in suspension arrays.
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Affiliation(s)
- Gang Wang
- The State Key Lab of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240 PR China
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Wei B, Li F, Yang H, Yu L, Zhao K, Zhou R, Hu Y. Magnetic beads-based enzymatic spectrofluorometric assay for rapid and sensitive detection of antibody against ApxIVA of Actinobacillus pleuropneumoniae. Biosens Bioelectron 2012; 35:390-393. [PMID: 22503209 DOI: 10.1016/j.bios.2012.03.027] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Accepted: 03/12/2012] [Indexed: 10/28/2022]
Abstract
In this paper, a simple, easily-operated and enzyme-amplified fluorescence immunoassay method using magnetic particles for the detection of antibody against Actinobacillus pleuropneumoniae (APP) has been presented. The A protein of APP Repeats-in-Toxin IV (ApxIVA) with high specificity to the APP species was immobilized onto the magnetic bead surfaces. Horseradish peroxidase (HRP), which can catalyze the substrate 4-hydroxyphenylacetic acid (p-HPA), generating fluorescent bi-p, p'-hydroxyphenylacetic acid (DBDA), was selected as an enzymatic-amplified tracer. The ApxIVA antibody was detected for the presence of APP infection by measuring the fluorescence intensity of DBDA. Under optimal conditions, the calibration plot obtained for standard positive serum was approximately linear within the dilution range 1:160-1:5120. The limit of detection (LOD) for the assay was 1:10240, considerably lower than that of ApxIVA-ELISA (1:320) (S/N=3). A series of repeatability measurements of using 1:320-fold diluted standard positive serum gave reproducible results with a relative standard deviation (RSD) of 4.8% (n=11). The ability of the immunosensor to analyze clinical samples was tested on porcine sera. The immunosensor yielded an efficiency of 89.7%, sensitivity of 90.9% and specificity of 89.3% compared with ApxIVA-ELISA.
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Affiliation(s)
- Bo Wei
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China; College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Fang Li
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
| | - Huicui Yang
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China; College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Lei Yu
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
| | - Kaihong Zhao
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China; College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Rui Zhou
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China
| | - Yonggang Hu
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China; College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430070, China.
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Luo Y, Zhang B, Chen M, Jiang T, Zhou D, Huang J, Fu W. Sensitive and rapid quantification of C-reactive protein using quantum dot-labeled microplate immunoassay. J Transl Med 2012; 10:24. [PMID: 22309411 PMCID: PMC3295717 DOI: 10.1186/1479-5876-10-24] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2011] [Accepted: 02/06/2012] [Indexed: 12/25/2022] Open
Abstract
Background High-sensitivity C-reactive protein (hs-CRP) assay is of great clinical importance in predicting risks associated with coronary heart disease. Existing hs-CRP assays either require complex operation or have low throughput and cannot be routinely implemented in rural settings due to limited laboratory resources. Methods We developed a novel hs-CRP assay capable of simultaneously quantifying over 90 clinical samples by using quantum dots-labeled immunoassay within a standard 96-well microplate. The specificity of the assay was enhanced by adopting two monoclonal antibodies (mAbs) that target distinct hs-CRP epitopes, serving as the coating antibody and the detection antibody, respectively. In the presence of hs-CRP antigen, the fluorescence intensity of the mAb-Ag-mAb sandwich complex captured on the microplate can be read out using a microplate reader. Results The proposed hs-CRP assay provides a wide analytical range of 0.001-100 mg/L with a detection limit of 0.06 (0.19) μg/L within 1.5 h. The accuracy of the proposed assay has been confirmed for low coefficient of variations (CVs), 2.27% (intra-assay) and 8.52% (inter-assay), together with recoveries of 96.7-104.2%. Bland-Altman plots of 104 clinical samples exhibited good consistency among the proposed assay, commercial high-sensitivity ELISA, and nephelometry, indicating the prospects of the newly developed hs-CRP assay as an alternative to existing hs-CRP assays. Conclusion The developed assay meets the needs of the rapid, sensitive and high-throughput determination of hs-CRP levels within a short time using minimal resources. In addition, the developed assay can also be used to detect and quantify other diagnostic biomarkers by immobilizing specific monoclonal antibodies.
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Affiliation(s)
- Yang Luo
- Department of Laboratory Medicine, Southwest Hospital, The Third Military Medical University, Chong Qing 400038, Peoples' Republic of China
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Cowles CL, Zhu X. Sensitive detection of cardiac biomarker using ZnS nanoparticles as novel signal transducers. Biosens Bioelectron 2011; 30:342-6. [PMID: 22014622 DOI: 10.1016/j.bios.2011.09.034] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Revised: 09/02/2011] [Accepted: 09/27/2011] [Indexed: 12/15/2022]
Abstract
C-reactive protein (CRP), a 115 kDa pentameric protein, is one of the important cardiac biomarkers that are indicative of coronary heart events. Sensitive detection of CRP in human serum is critical for the diagnosis of coronary heart disease. This work presents a sensitive sandwich immunoassay for the detection of CRP in human serum using zinc sulfide (ZnS) nanoparticles as novel fluorescence signal transducers. In this assay, monoclonal anti-CRP antibodies are used to capture CRP in human serum, and then the captured CRPs are incubated with biotinylated monoclonal anti-CRP and Neutravidin coated ZnS nanoparticle to form sandwich immunocomplexes. Quantification of CRP occurs when zinc ions released from ZnS nanoparticle labels are mixed with zinc-ion sensitive fluorescence indicator Fluozin-3 for fluorescence generation. The developed assay presents a detection limit around 10 pM and a detection range with more than two orders of magnitude.
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Affiliation(s)
- Chad L Cowles
- Department of Electrical and Biomedical Engineering, University of Nevada Reno, Reno, NV 89557-0260, USA
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Zhou G, Wang P, Yuan J, Qiu T, He Z. Immunomagnetic assay combined with CdSe/ZnS amplification of chemiluminescence for the detection of abscisic acid. Sci China Chem 2011. [DOI: 10.1007/s11426-011-4326-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Xiang DS, Zeng GP, He ZK. Magnetic microparticle-based multiplexed DNA detection with biobarcoded quantum dot probes. Biosens Bioelectron 2011; 26:4405-10. [DOI: 10.1016/j.bios.2011.04.051] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Revised: 04/26/2011] [Accepted: 04/27/2011] [Indexed: 10/18/2022]
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Sun M, Liu C. A novel bead-based fluorescence immunoassay for aldosterone. J Biomed Res 2011; 25:213-9. [PMID: 23554692 PMCID: PMC3597056 DOI: 10.1016/s1674-8301(11)60028-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2010] [Revised: 12/07/2010] [Accepted: 05/02/2011] [Indexed: 11/27/2022] Open
Abstract
Aldosterone quantification helps evaluate the rennin-angiotensin-aldosterone system. The new bead-based multiplex platform has not been applied in aldosterone detection to achieve simultaneous measurements of multiple hormones. A new sensitive competitive bead immunoassay based on Luminex technology for detecting aldosterone in small sample volumes was developed using two-antibody coupled beads and biotinylated aldosterone as tracer in combination with an extraction step. The assay was validated in human and mouse samples and exhibited a linear working range from 10 to 1,000 pg/mL. The assay was reproducible and precise with intra-assay coefficient of variations (CVs) from 6.0% to 11.2%, inter-assay CVs from 8.0% to 13.0% and good recovery [(90-110)%] and linearity [(89-107)%]. Excellent correlation was found between this new assay and the reference method (r = 0.96, P < 0.000,1). The successful establishment of this assay provides high possibility for carrying out bead-based multiplex assay measuring aldosterone and other parameters simultaneously in one 50 µL sample so that the efficiency can be improved and precious samples can be saved.
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Affiliation(s)
- Min Sun
- Department of Endocrinology, the First Affiliated Hospital of Nanjing Medical University, 300 Guangzhou Road, Nanjing, Jiangsu 210029, China
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Li H, Cao Z, Zhang Y, Lau C, Lu J. Simultaneous detection of two lung cancer biomarkers using dual-color fluorescence quantum dots. Analyst 2011; 136:1399-405. [DOI: 10.1039/c0an00704h] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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42
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Separation and detection of multiple pathogens in a food matrix by magnetic SERS nanoprobes. Anal Bioanal Chem 2010; 399:1271-8. [DOI: 10.1007/s00216-010-4453-6] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2010] [Revised: 11/15/2010] [Accepted: 11/17/2010] [Indexed: 10/18/2022]
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McFadden MJ, Junop MS, Brennan JD. Magnetic “Fishing” Assay To Screen Small-Molecule Mixtures for Modulators of Protein−Protein Interactions. Anal Chem 2010; 82:9850-7. [PMID: 21067198 DOI: 10.1021/ac102164d] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Meghan J. McFadden
- Chemical Biology Graduate Program, Department of Chemistry and Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, and Department of Biochemistry and Biomedical Engineering, McMaster University, 1200 Main Street West, Hamilton, Ontario L8N 3Z5, Canada
| | - Murray S. Junop
- Chemical Biology Graduate Program, Department of Chemistry and Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, and Department of Biochemistry and Biomedical Engineering, McMaster University, 1200 Main Street West, Hamilton, Ontario L8N 3Z5, Canada
| | - John D. Brennan
- Chemical Biology Graduate Program, Department of Chemistry and Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, and Department of Biochemistry and Biomedical Engineering, McMaster University, 1200 Main Street West, Hamilton, Ontario L8N 3Z5, Canada
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Mahanti P, Taylor T, Hayes MA, Cochran D, Petkus MM. Improved detectability and signal strength for rotating phase fluorescence immunoassays through image processing. Analyst 2010; 136:365-73. [PMID: 21046041 DOI: 10.1039/c0an00549e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fluorescence immunoassays based on rotating solid phase have shown promise of lowered detection limits, among other advantages. However, intrinsic background distortion effects have limited their utility. Here, novel image processing strategies are used to minimize these effects and improve the estimate of concentration and lower the detection limit. This initial demonstration of a new processing capability is performed on data for a protein, myoglobin, which is a biomarker for acute myocardial infarction. For these data, compared with published results, the detection limit is improved by a factor of approximately one hundred (to 700 fM), which is competitive with or better than other immunoassay strategies (ELISA, for example) that are fully developed. This work suggests that image and video processing technologies can provide a valuable alternative approach to biochemical detection and concentration estimation.
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Bio-Inspired/-Functional Colloidal Core-Shell Polymeric-Based NanoSystems: Technology Promise in Tissue Engineering, Bioimaging and NanoMedicine. Polymers (Basel) 2010. [DOI: 10.3390/polym2030323] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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