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Sybachin A, Pigareva V. Ensembles of carboxymethyl cyclodextrins on cationic liposomes as highly efficient nanocontainers for the delivery of hydrophobic compounds. Biochim Biophys Acta Gen Subj 2023; 1867:130363. [PMID: 37037388 DOI: 10.1016/j.bbagen.2023.130363] [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: 02/07/2023] [Revised: 03/21/2023] [Accepted: 04/04/2023] [Indexed: 04/12/2023]
Abstract
The increase of payload is one of the key tasks in creation of nanocontainers for the delivery of bioactive substances (BAS). In this work the adsorption of anionic carboxymethyl cyclodextrins (CMCDs) on the surface of cationic liposomes was studied as mechanism of formation of capacious nanocontainers for the encapsulation and delivery of hydrophobic BAS. The formation and physico-chemical characteristics of complexes were studied by means of laser microelectrophoresis, dynamic light-scattering, conductometry and atomic force microscopy (AFM). As a model, bioactive molecule hydrophobic curcumin was chosen for the investigation. The encapsulation of curcumin was controlled by UV-Vis spectrometry. Interaction of CMCDs/liposomes complexes with model cell membranes was visualized by fluorescent microscopy. Finally, cytotoxicity of nanocontainers was studied by MTT-test. It was estimated that colloid stable complexes with net positive charge could contain up to 2.5÷5 CMCD molecules per one cationic lipid. Incorporation of curcumin in CMCDs does not change the character of interaction of oligosaccharides with liposomal membranes of individual liposome. CMCDs/liposomes complexes adsorb on model cell membranes without significant loss of CMCD molecules. This fact in addition to low cytotoxicity of cationic CMCDs/liposomes complexes demonstrates potential of their application as nanovehicles for the delivery of BAS.
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Affiliation(s)
- Andrey Sybachin
- Lomonosov Moscow State University, Chemistry Department, Leninskie Gory, 1-3, Moscow 119991, Russia.
| | - Vladislava Pigareva
- Lomonosov Moscow State University, Chemistry Department, Leninskie Gory, 1-3, Moscow 119991, Russia
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Sánchez-Alarcón RI, Noguera-Gomez J, Chirvony VS, Pashaei Adl H, Boix PP, Alarcón-Flores G, Martínez-Pastor JP, Abargues R. Spray-driven halide exchange in solid-state CsPbX 3 nanocrystal films. NANOSCALE 2022; 14:13214-13226. [PMID: 36047914 DOI: 10.1039/d2nr03262g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
CsPbI3 perovskite nanocrystals (NCs) are promising building blocks for photovoltaics and optoelectronics. However, they exhibit an essential drawback in the form of phase stability: α-phase, with a ∼1.80 eV bandgap, can easily experience a phase transition to a non-radiative orthorhombic δ-phase in an ambient environment. This leads to the need to carry out the CsPbI3-based device fabrication in an inert atmosphere, which is technologically inconvenient and expensive. One of the most successful approaches proposed to overcome this problem is synthesizing mixed halide CsPbBr3-xIx NCs to improve the stability of the α-phase perovskite structure. However, the formation of high-quality thin films of CsPbBr3-xIx NCs with high PLQY is challenging owing to the degradation of their optical properties after deposition on a substrate. This work presents spray coating to carry out a solid-state anion exchange in CsPbBr3 NCs thin films at ambient conditions with low-demanding reaction conditions. This constitutes a novel open-air and annealing-free technology to manufacture CsPbBr3-xIx NC thin films with high optical quality and record high photoluminescence quantum yields (PLQY) based on spray-driven halide (Br- to I-) anion exchange in a solid-state phase. Besides, tunable emission wavelengths between 520 and 670 nm can be obtained from CsPbBr3-xIx NC films using accurate tuning volumes of HI solution sprayed over the initial surface of CsPbBr3 film to provide the halide exchange. The optical quality of the halide-exchanged PNCs films remains practically identical to that of initial Br-containing layers, with a remarkable PLQY enhancement after anion exchange, from ∼61% for CsPbBr3 thin films emitting at 520 nm to ∼84% for mixed halide CsPbBr3-xIx film emitting at 640 nm. The huge potential of the system is confirmed by demonstrating a low-threshold amplified spontaneous emission.
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Affiliation(s)
- R I Sánchez-Alarcón
- UMDO Instituto de Ciencia de los Materiales-Universidad de Valencia, PO Box 22085, 46071, Valencia, España, Spain.
- Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada Unidad Legaría, Legaría #694 Col. Irrigación, Ciudad de México, Mexico, 11500
| | - J Noguera-Gomez
- UMDO Instituto de Ciencia de los Materiales-Universidad de Valencia, PO Box 22085, 46071, Valencia, España, Spain.
| | - V S Chirvony
- UMDO Instituto de Ciencia de los Materiales-Universidad de Valencia, PO Box 22085, 46071, Valencia, España, Spain.
| | - H Pashaei Adl
- UMDO Instituto de Ciencia de los Materiales-Universidad de Valencia, PO Box 22085, 46071, Valencia, España, Spain.
| | - Pablo P Boix
- UMDO Instituto de Ciencia de los Materiales-Universidad de Valencia, PO Box 22085, 46071, Valencia, España, Spain.
| | - G Alarcón-Flores
- Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada Unidad Legaría, Legaría #694 Col. Irrigación, Ciudad de México, Mexico, 11500
| | - J P Martínez-Pastor
- UMDO Instituto de Ciencia de los Materiales-Universidad de Valencia, PO Box 22085, 46071, Valencia, España, Spain.
| | - R Abargues
- UMDO Instituto de Ciencia de los Materiales-Universidad de Valencia, PO Box 22085, 46071, Valencia, España, Spain.
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McKenna B, Shivkumar A, Charles B, Evans RC. Synthetic factors affecting the stability of methylammonium lead halide perovskite nanocrystals. NANOSCALE 2020; 12:11694-11702. [PMID: 32441286 DOI: 10.1039/d0nr03227a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Lead halide perovskite nanocrystals (PNCs) have emerged as promising candidates for use in optoelectronic devices. Significant focus has been directed towards optimising synthetic conditions to obtain PNCs with tunable emission properties. However, the reproducible production of stable PNC dispersions is also crucial for fabrication and scale-up of these devices using liquid deposition methods. Here, the stability of methylammonium lead halide (MAPbX3 where X = Br, I) PNCs produced via the ligand-assisted reprecipitation process is explored. We have focussed on understanding how different combinations of specific synthetic factors - dilution, halide source and ratio as well as capping-ligand concentration - affect the stability of the resultant PNC dispersion. Photoluminescence spectroscopy, transmission electron microscopy and dynamic light scattering studies revealed that subtle changes in the reaction conditions lead to significant changes in the particle morphology and associated optical properties, often with catastrophic consequences on stability. This study highlights the importance of designing PNC dispersions in order to make more efficient and reliable optoelectronic devices.
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Affiliation(s)
- Barry McKenna
- School of Chemistry and CRANN, Trinity College, The University of Dublin, Dublin 2, Ireland
| | - Abhinav Shivkumar
- School of Chemistry and CRANN, Trinity College, The University of Dublin, Dublin 2, Ireland
| | - Bethan Charles
- Department of Materials Science & Metallurgy, University of Cambridge, UK.
| | - Rachel C Evans
- Department of Materials Science & Metallurgy, University of Cambridge, UK.
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Development of a near infrared protein nanoprobe targeting Thomsen-Friedenreich antigen for intraoperative detection of submillimeter nodules in an ovarian peritoneal carcinomatosis mouse model. Biomaterials 2020; 241:119908. [PMID: 32126396 DOI: 10.1016/j.biomaterials.2020.119908] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 02/12/2020] [Accepted: 02/19/2020] [Indexed: 02/07/2023]
Abstract
The epithelial ovarian cancer is one of the most lethal gynecological malignancy due to its late diagnostic and many relapses observed after first line of treatment. Once diagnose, the most important prognostic factor is the completeness of cytoreductive surgery. To achieve this goal, surgeons have to pinpoint and remove nodules, especially the smallest nodules. Recent advances in fluorescence-guided surgery led us to develop a recombinant lectin as a nanoprobe for the microscopic detection of nodules in the peritoneal cavity of tumor-bearing mice. This lectin has an intrinsic specificity for a carcinoma-associated glycan biomarker, the Thomsen-Friedenreich antigen. In this study, after its labelling by a near infrared dye, we first demonstrated that this nanoprobe allowed indirect detection of nodules already implanted in the peritoneal cavity, through tumor microenvironment targeting. Secondly, in a protocol mimicking the scattering of cells during surgery, we obtained a direct and long-lasting detection of tumor cells in vivo. This lectin as already been described as a nanocontainer able to do targeted delivery of a therapeutic compound to carcinoma cells. Future developments will focus on the combination of the nanoprobe and nanocontainer aspects in an intraperitoneal nanotheranostic approach.
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