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Vodyashkin A, Sergorodceva A, Kezimana P, Morozova M, Nikolskaya E, Mollaeva M, Yabbarov N, Sokol M, Chirkina M, Butusov L, Timofeev A. Synthesis and activation of pH-sensitive metal-organic framework Sr(BDC) ∞ for oral drug delivery. Dalton Trans 2024; 53:1048-1057. [PMID: 38099594 DOI: 10.1039/d3dt02822d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2024]
Abstract
Metal-organic frameworks (MOFs) are widely used in the biomedical industry. In this study, we developed a new method for obtaining a metal-organic structure of strontium and terephthalic acid, Sr(BDC), and an alternative activation method for removing DMF from the pores. Sr(BDC) MOFs were successfully prepared and characterized by XRD, FTIR, TGA, and SEM. The importance of the activation steps was confirmed by TGA, which showed that the Sr(BDC)(DMF) sample can contain up to a quarter of the solvent (DMF) before activation. In our study, IR spectroscopy confirmed the possibility of removing DMF by ethanol treatment from the Sr-BDC crystals. A comparative analysis of the effect of the activation method on the specific surface and pore size of Sr-BDC and its sorption properties using the model drug doxorubicin showed that due to the undeveloped surface of the Sr-(BDC)(DMF) sample, it is not possible to obtain an adsorption isotherm and determine the pore size distribution, thus showing the importance of the activation step. Cytotoxicity and apoptosis assays were carried out to study the biological activity of MOFs, and we observed relatively low toxicity in the tested concentration range after 48 h, with over 92% cell survival for Sr(BDC)(DMF) and Sr(BDC)(260 °C), with a decrease only in the highest concentration (800 mg L-1). Similar results were observed in our apoptosis assays, as they revealed low apoptotic population generation of 2.52%, 3.23%, and 2.77% for Sr(BDC)(DMF), Sr(BDC) and Sr(BDC)(260 °C), respectively. Overall, the findings indicate that ethanol-activated Sr(BDC) shows potential as a safe and effective material for drug delivery.
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Affiliation(s)
- Andrey Vodyashkin
- RUDN University, 117198, Moscow, Russia
- Bauman Moscow State Technical University, 105005, Moscow, Russia.
| | | | | | | | - Elena Nikolskaya
- N.M. Emanuel Institute of Biochemical Physics of Russian Academy of Sciences, 119334, Moscow, Russia
| | - Mariia Mollaeva
- N.M. Emanuel Institute of Biochemical Physics of Russian Academy of Sciences, 119334, Moscow, Russia
| | - Nikita Yabbarov
- N.M. Emanuel Institute of Biochemical Physics of Russian Academy of Sciences, 119334, Moscow, Russia
| | - Maria Sokol
- N.M. Emanuel Institute of Biochemical Physics of Russian Academy of Sciences, 119334, Moscow, Russia
| | - Margarita Chirkina
- N.M. Emanuel Institute of Biochemical Physics of Russian Academy of Sciences, 119334, Moscow, Russia
| | | | - Alexey Timofeev
- RUDN University, 117198, Moscow, Russia
- National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 115409, Moscow, Russia
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Kosmulski M. The pH dependent surface charging and points of zero charge. X. Update. Adv Colloid Interface Sci 2023; 319:102973. [PMID: 37573830 DOI: 10.1016/j.cis.2023.102973] [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: 05/26/2023] [Revised: 07/31/2023] [Accepted: 08/01/2023] [Indexed: 08/15/2023]
Abstract
Surfaces are often characterized by their points of zero charge (PZC) and isoelectric points (IEP). Different authors use these terms for different quantities, which may be equal to the actual PZC under certain conditions. Several popular methods lead to results which are inappropriately termed PZC. This present review is limited to zero-points obtained in the presence of inert electrolytes (halides, nitrates, and perchlorates of the 1st group metals). IEP are reported for all kinds of materials. PZC of metal oxides obtained as common intersection points of potentiometric curves for 3 or more ionic strengths (or by means of equivalent methods) are also reported, while the apparent PZC obtained by mass titration, pH-drift method, etc. are deliberately neglected. The results published in the recent publications and older results overlooked in the previous compilations by the same author are reported. The PZC/IEP are accompanied by information on the temperature and on the nature and concentration of supporting electrolyte (if available). The references to previous reviews by the same author allow to compare the newest results with the PZC/IEP of similar materials from the older literature.
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Affiliation(s)
- Marek Kosmulski
- Lublin University of Technology, Nadbystrzycka 38, PL-20618 Lublin, Poland.
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Koshevaya E, Krivoshapkina E, Krivoshapkin P. Tantalum oxide nanoparticles as an advanced platform for cancer diagnostics: a review and perspective. J Mater Chem B 2021; 9:5008-5024. [PMID: 34113950 DOI: 10.1039/d1tb00570g] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The development of new safe and effective contrast agents (CAs) is a crucial factor to increase the effectiveness of computed tomography (CT). For now, tantalum oxide-based nanoparticles (TaOx NPs) are among the most promising CAs for CT due to their superior properties: high X-ray attenuation coefficient, excellent biocompatibility, and easily modifiable surface chemistry. Compared to the commercially available analogs (iodine-based CAs), TaOx NPs provide better contrast performance, long-circulation, and high safety profiles (reduced exposure of X-rays and CA dosage). Among the investigated nanoparticulate CAs they afford higher cost-effectiveness (Au, Pt, Lu). TaOx NPs can also be easily modified to include other imaging or therapeutic modalities. This review aims to summarize the current state-of-the-art knowledge in the field of tantalum oxide-based CAs used for single or multimodal imaging and theranostic purposes. The design specification of TaOx NPs in terms of size, surface functionalization, composition, and their influence on the contrast performance, toxicity, and pharmacokinetics are discussed. Finally, the future opportunities and challenges of TaOx NPs used as CT CAs are addressed.
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Affiliation(s)
- Ekaterina Koshevaya
- Institute of Chemistry of Federal Research Center "Komi Science Centre of the Ural Branch of the Russian Academy of Sciences", Syktyvkar 167000, Russia and State Research Center - Burnasyan Federal Medical Biophysical Center of Federal Medical Biological Agency, Moscow 123182, Russia
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