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Xu Q, Wang Y, Gao P, Jiang Y. Preparation of “pomegranate”-like QD/SiO 2/poly(St- co-MAA) fluorescent nanobeads in two steps to improve stability and biocompatibility. NEW J CHEM 2021. [DOI: 10.1039/d1nj00526j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Fluorescent nanobeads are widely used due to their advantages of visualization, sensitivity and the quantitative measurement of target analytes.
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Affiliation(s)
- Qianrui Xu
- School of Chemistry and Chemical Engineering
- Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research
- Southeast University
- China
| | - Yang Wang
- School of Chemistry and Chemical Engineering
- Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research
- Southeast University
- China
| | - Pengcheng Gao
- School of Chemistry and Chemical Engineering
- Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research
- Southeast University
- China
| | - Yong Jiang
- School of Chemistry and Chemical Engineering
- Jiangsu Province Hi-Tech Key Laboratory for Biomedical Research
- Southeast University
- China
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2
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Xiang Y, Zhang Y, Sun X, Chai Y, Xu X, Hu Y. Rapid Self-Assembly of Au Nanoparticles on Rigid Mesoporous Yeast-Based Microspheres for Sensitive Immunoassay. ACS APPLIED MATERIALS & INTERFACES 2018; 10:43450-43461. [PMID: 30457828 DOI: 10.1021/acsami.8b16333] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A simple, rapid, inexpensive, eco-friendly, and high-throughput biological strategy for the preparation of functional microspheres on a yeast-cell platform was introduced. Microspheres prepared through the treatment of yeast cells with formaldehyde and decoating buffer exhibited excellent characteristics, such as superior mechanical strength, high sulfhydryl group content, and mesoporous structure. Au nanoparticles (NPs) easily and rapidly self-assembled onto the surfaces of the yeast-based microspheres within 5 min to form rigid yeast@Au microspheres with high monodispersity and uniformity. The rapid formation of yeast@Au microspheres mainly involved the enhancement of sulfhydryl groups and mesoporosity. The yeast@Au microspheres were successfully used in a flow cytometry immunoassay to detect Pseudorabies viral infection events. Signal-to-noise ratio was enhanced by approximately 49.4-fold. The presence of Au NPs on the yeast-based microspheres greatly improved sensitivity by decreasing noise through reducing nonspecific adsorption, highly enhancing the fluorescence signal caused by the surface plasmon resonance effect, and increasing the coupling efficiency of the capture protein. The presented method was used to analyze 81 clinical swine serum specimens. The results obtained by this developed method were compared to those of commercial diagnostic kits. The sensitivity, specificity, and efficiency of the developed method were 92.31, 88.24, and 88.89%, respectively. The excellent characteristics of the yeast@Au microspheres illustrate its great potential for high-throughput immunoassay applications in the fields of disease diagnosis, environmental analysis, and food safety.
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Affiliation(s)
| | | | | | | | - Xiangdong Xu
- School of Public Health , Hebei Medical University , Shijiazhuang 050017 , China
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3
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Palantavida S, Peng B, Sokolov I. Ultrabright fluorescent silica particles with a large number of complex spectra excited with a single wavelength for multiplex applications. NANOSCALE 2017; 9:4881-4890. [PMID: 28177010 DOI: 10.1039/c6nr08976c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report on a novel approach to synthesize ultrabright fluorescent silica particles capable of producing a large number of complex spectra. The spectra can be excited using a single wavelength which is paramount in quantitative fluorescence imaging, flow cytometry and sensing applications. The approach employs the physical encapsulation of organic fluorescent molecules inside a nanoporous silica matrix with no dye leakage. As was recently demonstrated, such an encapsulation allowed for the encapsulation of very high concentrations of organic dyes without quenching their fluorescent efficiency. As a result, dye molecules are distanced within ∼5 nm from each other; it theoretically allows for efficient exchange of excitation energy via Förster resonance energy transfer (FRET). Here we present the first experimental demonstration of the encapsulation of fluorescent dyes in the FRET sequence. Attaining a FRET sequence of up to five different dyes is presented. The number of distinguishable spectra can be further increased by using different relative concentrations of encapsulated dyes. Combining these approaches allows for creating a large number of ultrabright fluorescent particles with substantially different fluorescence spectra. We also demonstrate the utilization of these particles for potential multiplexing applications. Though fluorescence spectra of the obtained multiplex probes are typically overlapping, they can be distinguished by using standard linear decomposition algorithms.
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Affiliation(s)
- S Palantavida
- Department of Mechanical Engineering, Tufts University, 200 College Ave., Medford, MA 02155, USA.
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4
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Lai Y, Sun S, He T, Schlücker S, Wang Y. Raman-encoded microbeads for spectral multiplexing with SERS detection. RSC Adv 2015. [DOI: 10.1039/c4ra16163g] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Spectral multiplexing on polystyrene beads by SERS was demonstrated by encoding the silica-encapsulated self-assembled monolayers of Raman reporter-coated gold nanoparticles.
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Affiliation(s)
- Yuming Lai
- Faculty of Chemistry
- University of Duisburg-Essen
- Germany
- National Center for Materials Service Safety
- University of Science and Technology Beijing
| | - Shuqing Sun
- Laboratory of Optical Imaging and Imaging
- Shenzhen Key Laboratory for Minimally Invasive Medical Technologies
- Graduate School at Shenzhen
- Tsinghua University
- Shenzhen
| | - Tao He
- Laboratory of Nanodevice
- National Center for Nanoscience and Technology
- Beijing
- China
| | | | - Yuling Wang
- Faculty of Chemistry
- University of Duisburg-Essen
- Germany
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5
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Nanoparticle-encapsulated vis- and NIR-emissive fluorophores with different fluorescence decay kinetics for lifetime multiplexing. Anal Bioanal Chem 2014; 406:3315-22. [DOI: 10.1007/s00216-013-7597-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Revised: 12/16/2013] [Accepted: 12/21/2013] [Indexed: 01/30/2023]
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6
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Hoffmann K, Behnke T, Drescher D, Kneipp J, Resch-Genger U. Near-infrared-emitting nanoparticles for lifetime-based multiplexed analysis and imaging of living cells. ACS NANO 2013; 7:6674-6684. [PMID: 23837453 DOI: 10.1021/nn4029458] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The increase in information content from bioassays and bioimaging requires robust and efficient strategies for the detection of multiple analytes or targets in a single measurement, thereby addressing current health and security concerns. For fluorescence techniques, an attractive alternative to commonly performed spectral or color multiplexing presents lifetime multiplexing and the discrimination between different fluorophores based on their fluorescence decay kinetics. This strategy relies on fluorescent labels with sufficiently different lifetimes that are excitable at the same wavelength and detectable within the same spectral window. Here, we report on lifetime multiplexing and discrimination with a set of nanometer-sized particles loaded with near-infrared emissive organic fluorophores chosen to display very similar absorption and emission spectra, yet different fluorescence decay kinetics in suspension. Furthermore, as a first proof-of-concept, we describe bioimaging studies with 3T3 fibroblasts and J774 macrophages, incubated with mixtures of these reporters employing fluorescence lifetime imaging microscopy. These proof-of-concept measurements underline the potential of fluorescent nanoparticle reporters in fluorescence lifetime multiplexing, barcoding, and imaging for cellular studies, cell-based assays, and molecular imaging.
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Affiliation(s)
- Katrin Hoffmann
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Straße 11, 12489 Berlin, Germany
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7
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Behnke T, Mathejczyk JE, Brehm R, Würth C, Gomes FR, Dullin C, Napp J, Alves F, Resch-Genger U. Target-specific nanoparticles containing a broad band emissive NIR dye for the sensitive detection and characterization of tumor development. Biomaterials 2012; 34:160-70. [PMID: 23072943 DOI: 10.1016/j.biomaterials.2012.09.028] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Accepted: 09/15/2012] [Indexed: 02/08/2023]
Abstract
Current optical probes including engineered nanoparticles (NPs) are constructed from near infrared (NIR)-emissive organic dyes with narrow absorption and emission bands and small Stokes shifts prone to aggregation-induced self-quenching. Here, we present the new asymmetric cyanine Itrybe with broad, almost environment-insensitive absorption and emission bands in the diagnostic window, offering a unique flexibility of the choice of excitation and detection wavelengths compared to common NIR dyes. This strongly emissive dye was spectroscopically studied in different solvents and encapsulated into differently sized (15, 25, 100 nm) amino-modified polystyrene NPs (PSNPs) via a one-step staining procedure. As proof-of-concept for its potential for pre-/clinical imaging applications, Itrybe-loaded NPs were surface-functionalized with polyethylene glycol (PEG) and the tumor-targeting antibody Herceptin and their binding specificity to the tumor-specific biomarker HER2 was systematically assessed. Itrybe-loaded NPs display strong fluorescence signals in vitro and in vivo and Herceptin-conjugated NPs bind specifically to HER2 as demonstrated in immunoassays as well as on tumor cells and sections from mouse tumor xenografts in vitro. This demonstrates that our design strategy exploiting broad band-absorbing and -emitting dyes yields versatile and bright NIR probes with a high potential for e.g. the sensitive detection and characterization of tumor development and progression.
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Affiliation(s)
- Thomas Behnke
- BAM Federal Institute for Materials Research and Testing, 1.10, Richard-Willstätter-Str. 11, 12489 Berlin, Germany
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8
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Deng W, Goldys EM. Plasmonic approach to enhanced fluorescence for applications in biotechnology and the life sciences. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:10152-10163. [PMID: 22568517 DOI: 10.1021/la300332x] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
One of the most rapidly growing areas of physics and nanotechnology is concerned with plasmonic effects on the nanometer scale; these have applications in sensing and imaging technologies. Nanoplasmonic colloids such as Ag and Au have been attracting active interest, and there has been a recent explosion in the use of these metallic nanostructures to modify the spectral properties of fluorophores favorably and to enhance the fluorescence emission intensity. In this feature article, we summarize our work over a range of nanoplasmonics-assisted biological applications such as flow cytometry, immunoassays, cell imaging and bioassays where we use custom-designed plasmonic nanostructures (Ag and Au) to enhance fluorescence signatures. This fluorophore-metal effect offers unique advantages in providing improved photostability and enhanced fluorescence signals. We discuss the plasmonic enhancement of lanthanide fluorophores whose long and microsecond lifetimes offer the advantage of background-free fluorescence detection, but low photon cycling rates lead to poor brightness. We also show that plasmonic colloids are capable of enhancing the emission of fluorescent nanoparticles, including upconverting nanocrystals and lanthanide nanocomposites.
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Affiliation(s)
- Wei Deng
- MQ BioFocus Research Centre, Macquarie University, North Ryde 2113 NSW, Australia
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9
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Encapsulation of Hydrophobic Dyes in Polystyrene Micro- and Nanoparticles via Swelling Procedures. J Fluoresc 2010; 21:937-44. [DOI: 10.1007/s10895-010-0632-2] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2009] [Accepted: 02/10/2010] [Indexed: 10/19/2022]
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10
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Deng W, Drozdowicz-Tomsia K, Jin D, Goldys EM. Enhanced flow cytometry-based bead immunoassays using metal nanostructures. Anal Chem 2009; 81:7248-55. [PMID: 19715357 DOI: 10.1021/ac900947h] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
While the principle of fluorescence enhancement of metal nanostructures is well-known, the utility of this effect in practical methodologies used in analytical laboratories remains to be established. In this work, we explore the advantage of fluorescence enhancement for flow cytometry. We report the observation of metal-enhanced fluorescence emission of fluorophores located on the surface of silica beads coated with nanostructured silver, suitable for flow cytometry detection. The fluorescence enhancement was investigated using a model AlexaFluor 430 IgG immunoassay and AlexaFluor 430 labeling. Approximately 8.5-fold and 10.1-fold higher fluorescence intensities at 430 nm excitation were, respectively, observed from silvered approximately 400 nm and 5 microm silica beads deposited on glass as compared to the control sample. The 400 nm and 5 microm beads were compatible with the flow cytometry readout, although lower enhancement factors of 3.0 and 3.7 were obtained. We show that such values are consistent with less favorable overlap of the plasmon resonance in silver nanostructures with 488 nm excitation wavelength used in the flow cytometry experiment. We, thus, demonstrated that the silvered silica beads are able to provide intensified fluorescence signals in flow cytometry which can improve the sensitivity of flow cytometry-based bioassay systems.
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Affiliation(s)
- Wei Deng
- Department of Engineering and Physics, Macquarie University, North Ryde 2109 NSW, Australia
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11
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Grabolle M, Kapusta P, Nann T, Shu X, Ziegler J, Resch-Genger U. Fluorescence Lifetime Multiplexing with Nanocrystals and Organic Labels. Anal Chem 2009; 81:7807-13. [DOI: 10.1021/ac900934a] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Markus Grabolle
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany, PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany, and School of Chemistry, University of East Anglia (UEA), Norwich NR4 7TJ, U.K
| | - Peter Kapusta
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany, PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany, and School of Chemistry, University of East Anglia (UEA), Norwich NR4 7TJ, U.K
| | - Thomas Nann
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany, PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany, and School of Chemistry, University of East Anglia (UEA), Norwich NR4 7TJ, U.K
| | - Xu Shu
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany, PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany, and School of Chemistry, University of East Anglia (UEA), Norwich NR4 7TJ, U.K
| | - Jan Ziegler
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany, PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany, and School of Chemistry, University of East Anglia (UEA), Norwich NR4 7TJ, U.K
| | - Ute Resch-Genger
- BAM Federal Institute for Materials Research and Testing, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany, PicoQuant GmbH, Rudower Chaussee 29, 12489 Berlin, Germany, and School of Chemistry, University of East Anglia (UEA), Norwich NR4 7TJ, U.K
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12
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Marcon L, Kozak D, Battersby BJ, Chappell KJ, Fairlie DP, Young P, Trau M. A dual-purpose synthetic colloidal platform for protease mapping: substrate profiling for Dengue and West Nile virus proteases. Anal Biochem 2008; 376:151-3. [DOI: 10.1016/j.ab.2008.01.034] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2007] [Revised: 01/09/2008] [Accepted: 01/30/2008] [Indexed: 10/22/2022]
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