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Zhang W, Smith N, Zhou Y, McGee CM, Bartoli M, Fu S, Chen J, Domena JB, Joji A, Burr H, Lv G, Cilingir EK, Bedendo S, Claure ML, Tagliaferro A, Eliezer D, Veliz EA, Zhang F, Wang C, Leblanc RM. Carbon dots as dual inhibitors of tau and amyloid-beta aggregation for the treatment of Alzheimer's disease. Acta Biomater 2024:S1742-7061(24)00306-4. [PMID: 38849023 DOI: 10.1016/j.actbio.2024.06.001] [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: 02/10/2024] [Revised: 05/27/2024] [Accepted: 06/03/2024] [Indexed: 06/09/2024]
Abstract
Alzheimer's disease (AD) is the most common form of senile dementia, presenting a significant challenge for the development of effective treatments. AD is characterized by extracellular amyloid plaques and intraneuronal neurofibrillary tangles. Therefore, targeting both hallmarks through inhibition of amyloid beta (Aβ) and tau aggregation presents a promising approach for drug development. Carbon dots (CD), with their high biocompatibility, minimal cytotoxicity, and blood-brain barrier (BBB) permeability, have emerged as promising drug nanocarriers. Congo red, an azo dye, has gathered significant attention for inhibiting amyloid-beta and tau aggregation. However, Congo red's inability to cross the BBB limits its potential to be used as a drug candidate for central nervous system (CNS) diseases. Furthermore, current studies only focus on using Congo red to target single disease hallmarks, without investigating dual inhibition capabilities. In this study, we synthesized Congo red-derived CD (CRCD) by using Congo red and citric acid as precursors, resulting in three variants, CRCD1, CRCD2 and CRCD3, based on different mass ratios of precursors. CRCD2 and CRCD3 exhibited sustained low cytotoxicity, and CRCD3 demonstrated the ability to traverse the BBB in a zebrafish model. Moreover, thioflavin T (ThT) aggregation assays and AFM imaging revealed CRCD as potent inhibitors against both tau and Aβ aggregation. Notably, CRCD1 emerged as the most robust inhibitor, displaying IC50 values of 0.2 ± 0.1 and 2.1 ± 0.5 µg/mL against tau and Aβ aggregation, respectively. Our findings underscore the dual inhibitory role of CRCD against tau and Aβ aggregation, showcasing effective BBB penetration and positioning CRCD as potential nanodrugs and nanocarriers for the CNS. Hence, CRCD-based compounds represent a promising candidate in the realm of multi-functional AD therapeutics, offering an innovative formulation component for future developments in this area. STATEMENT OF SIGNIFICANCE: This article reports Congo red-derived carbon dots (CRCD) as dual inhibitors of tau and amyloid-beta (Aβ) aggregation for the treatment of Alzheimer's disease (AD). The CRCD are biocompatible and show strong fluorescence, high stability, the ability to cross the blood-brain barrier, and the function of addressing two major pathological features of AD.
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Affiliation(s)
- Wei Zhang
- Department of Chemistry, University of Miami, Coral Gables, FL 33146, USA
| | - Nathan Smith
- Department of Biological Sciences, Rensselaer Polytechnic Institute, NY 12180, USA
| | - Yiqun Zhou
- Department of Chemistry, University of Miami, Coral Gables, FL 33146, USA; Department of Biological Sciences, Florida International University, Miami, FL 33199, USA
| | - Caitlin M McGee
- Department of Chemistry, University of Miami, Coral Gables, FL 33146, USA
| | - Mattia Bartoli
- Department of Applied Science and Technology, Politecnico di Torino, Italy; Center for Sustainable Future Technologies (CSFT), Istituto Italiano di Technologia (IIT), Via Livorno 60, 10144 Turin, Italy
| | - Shiwei Fu
- Department of Chemistry, University of Miami, Coral Gables, FL 33146, USA
| | - Jiuyan Chen
- Department of Chemistry, University of Miami, Coral Gables, FL 33146, USA
| | - Justin B Domena
- Department of Chemistry, University of Miami, Coral Gables, FL 33146, USA
| | - Annu Joji
- Department of Chemistry, University of Miami, Coral Gables, FL 33146, USA
| | - Hannah Burr
- Department of Biological Sciences, Rensselaer Polytechnic Institute, NY 12180, USA
| | - Guohua Lv
- Department of Biochemistry, Weill Cornell Medicine, 1300 York Avenue, New York, NY 10065, USA
| | - Emel K Cilingir
- Department of Chemistry, University of Miami, Coral Gables, FL 33146, USA
| | - Susanna Bedendo
- Department of Applied Science and Technology, Politecnico di Torino, Italy
| | - Matteo L Claure
- Department of Chemistry, University of Miami, Coral Gables, FL 33146, USA
| | | | - David Eliezer
- Department of Biochemistry, Weill Cornell Medicine, 1300 York Avenue, New York, NY 10065, USA
| | - Eduardo A Veliz
- Department of Natural Sciences, Miami Dade Collage, Miami, FL 33132, USA
| | - Fuwu Zhang
- Department of Chemistry, University of Miami, Coral Gables, FL 33146, USA
| | - Chunyu Wang
- Department of Biological Sciences, Rensselaer Polytechnic Institute, NY 12180, USA.
| | - Roger M Leblanc
- Department of Chemistry, University of Miami, Coral Gables, FL 33146, USA.
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Boussouga YA, Joseph J, Stryhanyuk H, Richnow HH, Schäfer AI. Adsorption of uranium (VI) complexes with polymer-based spherical activated carbon. WATER RESEARCH 2024; 249:120825. [PMID: 38118222 DOI: 10.1016/j.watres.2023.120825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 10/11/2023] [Accepted: 11/02/2023] [Indexed: 12/22/2023]
Abstract
Adsorption processes with carbon-based adsorbents have received substantial attention as a solution to remove uranium from drinking water. This study investigated uranium adsorption by a polymer-based spherical activated carbon (PBSAC) characterised by a uniformly smooth exterior and an extended surface of internal cavities accessible via mesopores. The static adsorption of uranium was investigated applying varying PBSAC properties and relevant solution chemistry. Spatial time-of-flight secondary ion mass spectrometry (ToF-SIMS) was employed to visualise the distribution of the different uranium species in the PBSAC. The isotherms and thermodynamics calculations revealed monolayer adsorption capacities of 28-667 mg/g and physical adsorption energies of 13-21 kJ/mol. Increasing the surface oxygen content of the PBSAC to 10 % enhanced the adsorption and reduced the equilibrium time to 2 h, while the WHO drinking water guideline of 30 µgU/L could be achieved for an initial concentration of 250 µgU/L. Uranium adsorption with PBSAC was favourable at the pH 6-8. At this pH range, uranyl carbonate complexes (UO2CO3(aq), UO2(CO3)22-, (UO2)2CO3(OH)3-) predominated in the solution, and the ToF-SIMS analysis revealed that the adsorption of these complexes occurred on the surface and inside the PBSAC due to intra-particle diffusion. For the uranyl cations (UO22+, UO2OH+) at pH 2-4, only shallow adsorption in the outermost PBSAC layers was observed. The work demonstrated the effective removal of uranium from contaminated natural water (67 µgU/L) and meeting both German (10 µgU/L) and WHO guideline concentrations. These findings also open opportunities to consider PBSAC in hybrid treatment technologies for uranium removal, for instance, from high-level radioactive waste.
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Affiliation(s)
- Youssef-Amine Boussouga
- Institute for Advanced Membrane Technology (IAMT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen 76344, Germany.
| | - James Joseph
- Institute for Advanced Membrane Technology (IAMT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen 76344, Germany
| | - Hryhoriy Stryhanyuk
- Department of Isotope Biogeochemistry, ProVIS-Centre for Chemical Microscopy, Helmholtz, Center for Environmental Research (UFZ), Leipzig, Germany
| | - Hans H Richnow
- Department of Isotope Biogeochemistry, ProVIS-Centre for Chemical Microscopy, Helmholtz, Center for Environmental Research (UFZ), Leipzig, Germany
| | - Andrea I Schäfer
- Institute for Advanced Membrane Technology (IAMT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen 76344, Germany
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Mandal T, Mishra SR, Singh V. Comprehensive advances in the synthesis, fluorescence mechanism and multifunctional applications of red-emitting carbon nanomaterials. NANOSCALE ADVANCES 2023; 5:5717-5765. [PMID: 37881704 PMCID: PMC10597556 DOI: 10.1039/d3na00447c] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Accepted: 09/12/2023] [Indexed: 10/27/2023]
Abstract
Red emitting fluorescent carbon nanomaterials have drawn significant scientific interest in recent years due to their high quantum yield, water-dispersibility, photostability, biocompatibility, ease of surface functionalization, low cost and eco-friendliness. The red emissive characteristics of fluorescent carbon nanomaterials generally depend on the carbon source, reaction time, synthetic approach/methodology, surface functional groups, average size, and other reaction environments, which directly or indirectly help to achieve red emission. The importance of several factors to achieve red fluorescent carbon nanomaterials is highlighted in this review. Numerous plausible theories have been explained in detail to understand the origin of red fluorescence and tunable emission in these carbon-based nanostructures. The above advantages and fluorescence in the red region make them a potential candidate for multifunctional applications in various current fields. Therefore, this review focused on the recent advances in the synthesis approach, mechanism of fluorescence, and electronic and optical properties of red-emitting fluorescent carbon nanomaterials. This review also explains the several innovative applications of red-emitting fluorescent carbon nanomaterials such as biomedicine, light-emitting devices, sensing, photocatalysis, energy, anticounterfeiting, fluorescent silk, artificial photosynthesis, etc. It is hoped that by choosing appropriate methods, the present review can inspire and guide future research on the design of red emissive fluorescent carbon nanomaterials for potential advancements in multifunctional applications.
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Affiliation(s)
- Tuhin Mandal
- Environment Emission and CRM Section, CSIR-Central Institute of Mining and Fuel Research Dhanbad Jharkhand 828108 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201 002 India
| | - Shiv Rag Mishra
- Environment Emission and CRM Section, CSIR-Central Institute of Mining and Fuel Research Dhanbad Jharkhand 828108 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201 002 India
| | - Vikram Singh
- Environment Emission and CRM Section, CSIR-Central Institute of Mining and Fuel Research Dhanbad Jharkhand 828108 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201 002 India
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Zhang H, Guo X, Jian K, Fu L, Zhao X. Rapid Preparation of Long-Wavelength Emissive Carbon Dots for Information Encryption Using the Microwave-Assisted Method. Inorg Chem 2023; 62:13847-13856. [PMID: 37583357 DOI: 10.1021/acs.inorgchem.3c01677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/17/2023]
Abstract
The synthesis of long-wavelength emission fluorescent carbon dots is not common, and it is even more difficult to quickly synthesize within 10 min. In this experiment, yellow, orange, and red B, N codoped fluorescent carbon dots were successfully synthesized using a microwave-assisted method with o-phenylenediamine as the carbon-nitrogen source, boric acid as the boron source, and potassium chloride as the catalyst in just 7 min. Based on the different contents of B, N element doping, there are differences in their surface structures, resulting in differences in the luminescence properties of the synthesized carbon dots. Long-wavelength carbon dots can avoid interference from the blue fluorescence of filter papers and have a clearer display in information encryption. Therefore, three types of carbon dots were mixed with PVP to produce fluorescent inks, and anticounterfeiting and encryption patterns were designed on the filter paper, displaying different fluorescence information under sunlight and UV light. In addition, the rich fluorescent colors were combined ingeniously to enable secondary encryption of information in the form of binary codes that increase the difficulty of decoding. These indicate that the three synthesized long-wavelength carbon dots have good application prospects in information encryption.
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Affiliation(s)
- Hongmei Zhang
- School of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, China
| | - Xiangjun Guo
- School of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, China
| | - Ke Jian
- School of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, China
| | - Liming Fu
- School of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, China
| | - Xihui Zhao
- School of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, China
- State Key Laboratory of Bio-Fibers and Eco-Textiles, Shandong Collaborative Innovation Center of Marine Biobased Fibers and Ecological textiles, Institute of Marine Biobased Materials, Qingdao University, Qingdao 266071, China
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