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Gu T, Zhong J, Ge M, Shi R, He L, Bai P. Water-stable perovskite-silica nanocomposites for encoded microbeads construction and multiplexed detection. J Colloid Interface Sci 2024; 657:580-589. [PMID: 38071807 DOI: 10.1016/j.jcis.2023.11.185] [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: 10/01/2023] [Revised: 11/16/2023] [Accepted: 11/30/2023] [Indexed: 01/02/2024]
Abstract
All-inorganic lead halide perovskite nanocrystals exhibiting bright luminescence have great potential as fluorescence elements for optical encoding. However, their limited stability in water hinders the application in biosensing. In this study, novel optical encoded microbeads based on CsPbX3 (X = Cl, Br) nanocrystals are developed and applied in bead-based suspension arrays for the first time. Through the in-situ crystallization of CsPbX3 nanocrystals within mesoporous silica nano-templates (MSNs), accompanied by mesopores collapse after sintering, CsPbX3@MSNs (X3M) nanocomposites with uniform morphology and stable fluorescence intensity in aqueous solutions for up to 50 days are obtained. By assembling X3M with microspheres to form a host-guest structure, an optical encoding microbead (MX3M) library is established by varying the X3M ratio, halide composition, and the size of host microspheres, which can be easily decoded under multi-channel flow cytometer. As a result, MX3M exhibits outstanding capacity for specific target capture and negligible nonspecific absorption performance in the multiplex nucleic acid detection of respiratory viruses, with a low limit of detection (10 copies/rxn). This result highlights the tremendous potential of MX3M encoded microbeads constructed based on CsPbX3 nanocrystals for multiplexed bioassays.
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Affiliation(s)
- Tongxu Gu
- Jihua Laboratory, No.28 Island Ring South Road, Guicheng Street, Nanhai District, Foshan, Guangdong 528200, People's Republic of China.
| | - Jiajun Zhong
- Jihua Laboratory, No.28 Island Ring South Road, Guicheng Street, Nanhai District, Foshan, Guangdong 528200, People's Republic of China
| | - Minghao Ge
- Jihua Laboratory, No.28 Island Ring South Road, Guicheng Street, Nanhai District, Foshan, Guangdong 528200, People's Republic of China
| | - Ruiju Shi
- Jihua Laboratory, No.28 Island Ring South Road, Guicheng Street, Nanhai District, Foshan, Guangdong 528200, People's Republic of China
| | - Liang He
- Jihua Laboratory, No.28 Island Ring South Road, Guicheng Street, Nanhai District, Foshan, Guangdong 528200, People's Republic of China; CAS Key Lab of Bio-medical Diagnostics, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, Jiangsu 215163, People's Republic of China
| | - Pengli Bai
- Jihua Laboratory, No.28 Island Ring South Road, Guicheng Street, Nanhai District, Foshan, Guangdong 528200, People's Republic of China; CAS Key Lab of Bio-medical Diagnostics, Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou, Jiangsu 215163, People's Republic of China.
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Magnetic quantum dots barcodes using Fe 3O 4/TiO 2 with weak spectral absorption in the visible region for high-sensitivity multiplex detection of tumor markers. Biosens Bioelectron 2023; 227:115153. [PMID: 36805273 DOI: 10.1016/j.bios.2023.115153] [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: 01/03/2023] [Revised: 02/07/2023] [Accepted: 02/12/2023] [Indexed: 02/16/2023]
Abstract
Magnetic quantum dot (QD) barcode holds great potential for automatic suspension array and rapid point-of-care detection since it enables simultaneous target encoding, enrichment and separation. However, a serious obstacle to enhancing the encoding capacity of magnetic QD microbeads (MBs) is the fluorescence quenching of magnetic nanoparticles (MNPs) to quantum dots (QDs) in the visible wavelength range due to the broad and strong optical absorption spectrum of MNPs. Here, we report Fe3O4/TiO2 core/shell MNPs and CdSe/ZnS QDs for the construction of dual-function magnetic QD barcodes. Fe3O4/TiO2 MNPs can significantly inhibit fluorescence quenching because the weak absorption of visible light by the TiO2. The two-dimension barcode library of 30 magnetic QD barcodes was constructed based on Fe3O4/TiO2 MNPs and CdSe/ZnS QDs. Moreover, the magnetic QD barcodes showed high sensitivity for the multiplex detection of four tumor markers, cancer antigen 125 (CA125), cancer antigen 199 (CA199), alpha-fetoprotein (AFP), and neuron specific enolase (NSE) with detection limits of 0.89 KU/L, 0.72 KU/L, 0.05 ng/mL, and 0.15 ng/mL, respectively. This bifunctional magnetic QD barcodes are promising for automatic high-sensitivity multiplex bioassay.
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Casajuana Ester M, Day RM. Production and Utility of Extracellular Vesicles with 3D Culture Methods. Pharmaceutics 2023; 15:pharmaceutics15020663. [PMID: 36839984 PMCID: PMC9961751 DOI: 10.3390/pharmaceutics15020663] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 02/13/2023] [Accepted: 02/13/2023] [Indexed: 02/18/2023] Open
Abstract
In recent years, extracellular vesicles (EVs) have emerged as promising biomarkers, cell-free therapeutic agents, and drug delivery carriers. Despite their great clinical potential, poor yield and unscalable production of EVs remain significant challenges. When using 3D culture methods, such as scaffolds and bioreactors, large numbers of cells can be expanded and the cell environment can be manipulated to control the cell phenotype. This has been employed to successfully increase the production of EVs as well as to enhance their therapeutic effects. The physiological relevance of 3D cultures, such as spheroids, has also provided a strategy for understanding the role of EVs in the pathogenesis of several diseases and to evaluate their role as tools to deliver drugs. Additionally, 3D culture methods can encapsulate EVs to achieve more sustained therapeutic effects as well as prevent premature clearance of EVs to enable more localised delivery and concentrated exosome dosage. This review highlights the opportunities and drawbacks of different 3D culture methods and their use in EV research.
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