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Yin R, Tarnsangpradit J, Gul A, Jeong J, Hu X, Zhao Y, Wu H, Li Q, Fytas G, Karim A, Bockstaller MR, Matyjaszewski K. Organic nanoparticles with tunable size and rigidity by hyperbranching and cross-linking using microemulsion ATRP. Proc Natl Acad Sci U S A 2024; 121:e2406337121. [PMID: 38985759 PMCID: PMC11260123 DOI: 10.1073/pnas.2406337121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2024] [Accepted: 06/13/2024] [Indexed: 07/12/2024] Open
Abstract
Unlike inorganic nanoparticles, organic nanoparticles (oNPs) offer the advantage of "interior tailorability," thereby enabling the controlled variation of physicochemical characteristics and functionalities, for example, by incorporation of diverse functional small molecules. In this study, a unique inimer-based microemulsion approach is presented to realize oNPs with enhanced control of chemical and mechanical properties by deliberate variation of the degree of hyperbranching or cross-linking. The use of anionic cosurfactants led to oNPs with superior uniformity. Benefitting from the high initiator concentration from inimer and preserved chain-end functionality during atom transfer radical polymerization (ATRP), the capability of oNPs as a multifunctional macroinitiator for the subsequent surface-initiated ATRP was demonstrated. This facilitated the synthesis of densely tethered poly(methyl methacrylate) brush oNPs. Detailed analysis revealed that exceptionally high grafting densities (~1 nm-2) were attributable to multilayer surface grafting from oNPs due to the hyperbranched macromolecular architecture. The ability to control functional attributes along with elastic properties renders this "bottom-up" synthetic strategy of macroinitiator-type oNPs a unique platform for realizing functional materials with a broad spectrum of applications.
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Affiliation(s)
- Rongguan Yin
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA15213
| | - Jirameth Tarnsangpradit
- Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA15213
| | - Akhtar Gul
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX77204
| | - Jaepil Jeong
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA15213
| | - Xiaolei Hu
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA15213
| | - Yuqi Zhao
- Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA15213
| | - Hanshu Wu
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA15213
| | - Qiqi Li
- Max Planck Institute for Polymer Research, Mainz55128, Germany
- Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology-Hellas (FORTH), Heraklion70013, Greece
| | - George Fytas
- Max Planck Institute for Polymer Research, Mainz55128, Germany
- Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology-Hellas (FORTH), Heraklion70013, Greece
| | - Alamgir Karim
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX77204
| | - Michael R. Bockstaller
- Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA15213
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2
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Mikhail MM, Ahmed HB, Abdallah AEM, El-Shahat M, Emam HE. Surface Passivation of Carbon Dots for Tunable Biological Performance. J Fluoresc 2024:10.1007/s10895-024-03806-6. [PMID: 38958902 DOI: 10.1007/s10895-024-03806-6] [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: 04/02/2024] [Accepted: 06/06/2024] [Indexed: 07/04/2024]
Abstract
Recent investigations were shifted this trend toward exploring the biomedical applicability of CDs, relevant to chronic diseases. Herein, a systematic approach is demonstrated for studying the effect of variation in the surface passivation of CDs for tuning its optical character and biological performance. Alginate and pectin were successfully clustered oxygen-surface passivated CDs, while, chitin was used to nucleate nitrogen-surface passivated CDs. Pectin-treated with base (4.1 ± 1.8 nm) and chitin-treated acid (3.5 ± 1.7 nm) were ingrained the smallest O-surface passivated CDs and N-surface passivated CDs, respectively. However, N-surface passivated CDs were shown with the highest optical activity. CDs colloids prepared from alginate, pectin & chitin, resulted in reduction of tumor cell viability percentage to be 80.8%, 74.0% & 69.0% respectively. O-surface passivated CDs nucleated from alginate showed the highest anti-proliferative effects. Moreover, O-surface passivated CDs (from alginate) showed the supremacy in inhibition of inflammation, while, increasing of its concentration ten times resulted in significant increment in inhibition percent to be 28% & 42%, using 1 μg/mL & 10 μg/mL, respectively. In summarization, it could be decided that, compared to N-surface passivated CDs (from chitin), O-surface passivated CDs (from alginate) showed excellency in application as a concurrent anti-inflammatory/antitumor drug, to be applied as a potential therapeutical reagent for treatment of inflammation, in production of vaccines, immune-therapeutics, and immune-suppressive drugs.
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Affiliation(s)
- Mary M Mikhail
- Chemistry Department, Faculty of Science, Helwan University, Ain-Helwan, 11795, Cairo, Egypt
| | - Hanan B Ahmed
- Chemistry Department, Faculty of Science, Helwan University, Ain-Helwan, 11795, Cairo, Egypt.
| | - Amira E M Abdallah
- Chemistry Department, Faculty of Science, Helwan University, Ain-Helwan, 11795, Cairo, Egypt
| | - Mahmoud El-Shahat
- Photochemistry Department, Chemical Industries Research Institute, National Research Centre, 33 EL Buhouth St., Dokki, 12622, Giza, Egypt
| | - Hossam E Emam
- Department of Pretreatment and Finishing of Cellulosic Fibers, Textile Research and Technology Institute, National Research Centre, 33 EL Buhouth St., Dokki, 12622, Giza, Egypt.
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3
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Emam HE, Hamouda T, Emam EAM, Darwesh OM, Ahmed HB. Nano-scaled polyacrylonitrile for industrialization of nanofibers with photoluminescence and microbicide performance. Sci Rep 2024; 14:7926. [PMID: 38575619 PMCID: PMC10995123 DOI: 10.1038/s41598-024-58035-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Accepted: 03/25/2024] [Indexed: 04/06/2024] Open
Abstract
Nanofibers are investigated to be superiorly applicable in different purposes such as drug delivery systems, air filters, wound dressing, water filters, and tissue engineering. Herein, polyacrylonitrile (PAN) is thermally treated for autocatalytic cyclization, to give optically active PAN-nanopolymer, which is subsequently applicable for preparation of nanofibers through solution blow spinning. Whereas, solution blow spinning is identified as a process for production of nanofibers characterized with high porosity and large surface area from a minimum amounts of polymer solution. The as-prepared nanofibers were shown with excellent photoluminescence and microbicide performance. According to rheological properties, to obtain spinnable PAN-nanopolymer, PAN (12.5-15% wt/vol, honey like solution, 678-834 mPa s), thermal treatment for 2-4 h must be performed, whereas, time prolongation resulted in PAN-nanopolymer gelling or rubbering. Size distribution of PAN-nanopolymer (12.5% wt/vol) is estimated (68.8 ± 22.2 nm), to reflect its compatibility for the production of carbon nanofibers with size distribution of 300-400 nm. Spectral mapping data for the photoluminescent emission showed that, PAN-nanopolymer were exhibited with two intense peaks at 498 nm and 545 nm, to affirm their superiority for production of fluorescent nanofibers. The microbial reduction % was estimated for carbon nanofibers prepared from PAN-nanopolymer (12.5% wt/vol) to be 61.5%, 71.4% and 81.9%, against S. aureus, E. coli and C. albicans, respectively. So, the prepared florescent carbon nanofibers can be potentially applicable in anti-infective therapy.
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Affiliation(s)
- Hossam E Emam
- Department of Pretreatment and Finishing of Cellulosic Based Textiles, Textile Research and Technology Institute, National Research Centre, Scopus Affiliation ID 60014618, 33 EL Buhouth St., Dokki, Giza, 12622, Egypt.
| | - Tamer Hamouda
- Spinning and Weaving Engineering Department, Textile Research and Technology Institute, National Research Centre, 33 EL Buhouth St., Dokki, Giza, 12622, Egypt
| | - El-Amir M Emam
- Faculty of Applied Arts, Textile Printing, Dyeing and Finishing Department, Helwan University, Cairo, 11795, Egypt
| | - Osama M Darwesh
- Agricultural Microbiology Department, National Research Centre, Giza, 12622, Egypt
| | - Hanan B Ahmed
- Chemistry Department, Faculty of Science, Helwan University, Ain-Helwan, Cairo, 11795, Egypt.
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4
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Al-Anazi M. Gold versus platinum for chemical modification of carbon quantum dots from carboxymethyl cellulose: Tunable biomedical performance. Int J Biol Macromol 2024; 261:129830. [PMID: 38296138 DOI: 10.1016/j.ijbiomac.2024.129830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2023] [Revised: 01/22/2024] [Accepted: 01/27/2024] [Indexed: 02/05/2024]
Abstract
Urgent requirements for medication from chronic inflammation and cancer are considerably interested, while, the recent reports were considered with investigating simple methods for synthesis. Metal-modified carbon quantum dots ("M-CQDs") were successfully ingrained from carboxymethyl cellulose under the assistance of infra-red irradiation. The current approach demonstrates a study for the effect of structural tuning for biomedical performance of CQDs via modifying of CQDs with either gold (Au-CQDs) or platinum (Pt-CQDs). Successive nucleation of Au-CQDs and Pt-CQDs was confirmed via different instrumental analyses like, TEM micrographs, Zeta potential, XRD, FTIR, 1HNMR& 13CNMR spectra. The data reveal that, modification of CQDs (8.7 nm) with gold was reflected in insignificant effect on the mean size of CQDs (8.9 nm), whereas, doping of platinum resulted in slight enlargement of the size (12.4 nm). However, Pt-CQDs were exhibited with the highest anti-inflammatory (cell viability percent 78 %) and antimicrobial action. On the other hand, Au-CQDs were shown with the highest anticancer affinity (reduction of cell viability 83 %) compared to the others. The current study approved the superiority of CQDs modified with either gold or platinum to be successfully applicable as potential therapeutic reagents for the treatment of either cancer or inflammation diseases.
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Affiliation(s)
- Menier Al-Anazi
- Department of Chemistry, Faculty of Science, University of Tabuk, Tabuk 71491, Saudi Arabia.
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Almahri A, Al-bonayan AM, Attar RMS, Karkashan A, Abbas B, Al-Qahtani SD, El-Metwaly NM. Multifunctional Lipophobic Polymer Dots from Cyclodextrin: Antimicrobial/Anticancer Laborers and Silver Ions Chemo-Sensor. ACS OMEGA 2023; 8:16956-16965. [PMID: 37214711 PMCID: PMC10193544 DOI: 10.1021/acsomega.3c00873] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Accepted: 04/21/2023] [Indexed: 05/24/2023]
Abstract
β-Cyclodextrin (CD) is currently exploited for the implantation of lipophobic polymer dots (PDs) for antimicrobial and anticancer laborers. Moreover, the PDs were investigated to act as a chemo-sensor for metal detection. The data revealed that under basic conditions, photoluminescent PDs (5.1 nm) were successively clustered with a controllable size at 190 °C, whereas under acidic conditions, smaller-sized non-photoluminescent carbon nanoparticles (2.9 nm) were obtained. The fluorescence intensity of synthesized PDs under basic conditions was affected by pH, and such an intensity was significantly higher compared to that prepared under acidic conditions. The PDs were exploited as florescent detectors in estimation of Ag+ ions in aquatic streams. Treatment of Ag+ ion colloids with PDs resulted in fluorescence quenching attributing to the production of AgNPs that approved by spectral studies. The cell viability percent was estimated for Escherichia coli, Staphylococcus aureus, and Candida albicans after incubation with PDs implanted under basic conditions for 24 h. The cell mortality percent was estimated for breast cancer (MCF-7) after incubation with different concentrations of PDs that were implanted under acidic versus basic conditions to show that treatment of the tested cells with 1000 μg/mL PDs prepared under basic (IC50 232.5 μg/mL) and acidic (IC50 88.6 μg/mL) conditions resulted in cell mortality percentages of 70 and 90%, respectively.
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Affiliation(s)
- Albandary Almahri
- Department
of Chemistry, College of Science and Humanities in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
| | - Ameena M. Al-bonayan
- Department
of Chemistry, Faculty of Applied Sciences, Umm Al-Qura University, Makkah 21421, Saudi Arabia
| | - Roba M. S. Attar
- Department
of Biology, College of Sciences, University
of Jeddah, Jeddah 21959, Saudi Arabia
| | - Alaa Karkashan
- Department
of Biology, College of Sciences, University
of Jeddah, Jeddah 21959, Saudi Arabia
| | - Basma Abbas
- Department
of Biology, College of Sciences, University
of Jeddah, Jeddah 21959, Saudi Arabia
| | - Salhah D. Al-Qahtani
- Department
of Chemistry, College of Science, Princess
Nourah Bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
| | - Nashwa M. El-Metwaly
- Department
of Chemistry, Faculty of Applied Sciences, Umm Al-Qura University, Makkah 21421, Saudi Arabia
- Department
of Chemistry, Faculty of Science, Mansoura
University, El-Gomhoria
Street Mansoura 35516, Egypt
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6
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Du Y, Wang Y, Shamraienko V, Pöschel K, Synytska A. Donor:Acceptor Janus Nanoparticle-Based Films as Photoactive Layers: Control of Assembly and Impact on Performance of Devices. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023:e2206907. [PMID: 37010023 DOI: 10.1002/smll.202206907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 03/06/2023] [Indexed: 06/19/2023]
Abstract
Water-processable organic semiconductor nanoparticles (NPs) are considered promising materials for the next-generation of optoelectronic applications due to their controlled size, internal structure, and environmentally friendly processing. Reasonably, the controllable assembly of donor:acceptor (D:A) NPs on large areas, quality, and packing density of deposited films, as well as layer morphology, will influence the effectiveness of charge transfer at an interface and the final performance of designed optoelectronic devices.This work represents an easy and effective approach for designing self-assembled monolayers of D:A NPs. In this self-assembly procedure, the NP arrays are prepared on a large scale (2 × 2 cm2 ) at the air/water interface with controlled packing density and morphology. Due to the unique structure of individual D:A Janus particles and their assembled arrays, the Janus nanoparticle (JNP)-based device exhibits an 80% improvement of electron mobility and more balanced charge extraction compared to the conventional core-shell NP-based device. An outstanding performance of polymer solar cells with over 5% efficiency is achieved after post-annealing treatment of assembled arrays, representing one of the best results for NP-based organic photovoltaics. Ultimately, this work provides a new protocol for processing water-processable organic semiconductor colloids and future optoelectronic fabrication.
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Affiliation(s)
- Yixuan Du
- Institut Physikalische Chemie und Physik der Polymere, Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Str. 6, 01069, Dresden, Germany
- Fakultat Mathematik und Naturwissenschaften, Technische Universität Dresden, 01062, Dresden, Germany
- Bayerisches Polymerinstitut, Universität Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany
| | - Yuemeng Wang
- Institut Physikalische Chemie und Physik der Polymere, Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Str. 6, 01069, Dresden, Germany
| | - Volodymyr Shamraienko
- Fakultat Mathematik und Naturwissenschaften, Technische Universität Dresden, 01062, Dresden, Germany
| | - Kathrin Pöschel
- Institut Physikalische Chemie und Physik der Polymere, Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Str. 6, 01069, Dresden, Germany
| | - Alla Synytska
- Institut Physikalische Chemie und Physik der Polymere, Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Str. 6, 01069, Dresden, Germany
- Fakultat Mathematik und Naturwissenschaften, Technische Universität Dresden, 01062, Dresden, Germany
- Bayerisches Polymerinstitut, Universität Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany
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7
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Ahmed HB, Mahmoud NE, Mahdi AA, Emam HE, Abdelhameed RM. Affinity of carbon quantum dots anchored within metal organic framework matrix as enhancer of plant nourishment. Heliyon 2022; 8:e12396. [PMID: 36590470 PMCID: PMC9794903 DOI: 10.1016/j.heliyon.2022.e12396] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Revised: 10/02/2022] [Accepted: 12/08/2022] [Indexed: 12/23/2022] Open
Abstract
Nano-fertilizers were ascribed to be significantly advantageous with minimizing the negative effects of requiring excessive contents in the soil and reducing the number of times for fertilization. Herein, the superior affinity of carbon quantum dots (CQDs) anchored within metal organic framework (Cu-BTC) matrix was investigated for the first time as a fertilizer for sunflower. CQDs were nucleated from alkali-hydrolyzed carboxymethyl cellulose (CMC) via the hydrothermal technique. The synthesized CQDs (6.8 ± 3.7 nm) were anchored within Cu-BTC (crystalline rod-like structure) matrix, to produce CQDs@Cu-BTC composite. The obtained CQDs and CQDs@Cu-BTC were applied as nutrients for the sunflower plant. The chlorophyll a and carotenoids contents were 0.465 & 0.497 and 0.350 & 0.364 mg/g after treatment with CQDs & CQDs@Cu-BTC, respectively. The shoot length of sunflower sample was increased after feeding with CQDs and CQDs@Cu-BTC to be 38.7 and 46.5 cm, respectively. The obtained results confirmed that, the synthesized CQDs@Cu-BTC showed superiority as nutrient material via enhancing the growth and physiological properties of sunflower and consequently could be used as fertilizer for plants instead of the commercial nutrient.
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Affiliation(s)
- Hanan B. Ahmed
- Chemistry Department, Faculty of Science, Helwan University, Ain-Helwan, Cairo 11795, Egypt
- Corresponding author.
| | - Noura E. Mahmoud
- Biochemistry Unit, Plant Genetic Resources Department, Desert Research Center, Cairo, Egypt
| | - Asmaa A. Mahdi
- Biochemistry Unit, Plant Genetic Resources Department, Desert Research Center, Cairo, Egypt
| | - Hossam E. Emam
- Department of Pretreatment and Finishing of Cellulosic based Textiles, Textile Research and Technology Institute, National Research Centre, 33 EL Buhouth St., Dokki, Giza 12622, Egypt
- Corresponding author.
| | - Reda M. Abdelhameed
- Applied Organic Chemistry Department, Chemical Industries Research Institute, National Research Centre, 33 EL Buhouth St., Dokki, Giza 12622, Egypt
- Corresponding author.
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8
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Anticancer and Microbicide Action of Carbon Quantum Dots Derived from Microcrystalline Cellulose: Hydrothermal versus Infrared Assisted Techniques. ARAB J CHEM 2022. [DOI: 10.1016/j.arabjc.2022.104419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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9
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Cai R, Xiao L, Liu M, Du F, Wang Z. Recent Advances in Functional Carbon Quantum Dots for Antitumour. Int J Nanomedicine 2021; 16:7195-7229. [PMID: 34720582 PMCID: PMC8550800 DOI: 10.2147/ijn.s334012] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Accepted: 09/23/2021] [Indexed: 12/20/2022] Open
Abstract
Carbon quantum dots (CQDs) are an emerging class of quasi-zero-dimensional photoluminescent nanomaterials with particle sizes less than 10 nm. Owing to their favourable water dispersion, strong chemical inertia, stable optical performance, and good biocompatibility, CQDs have become prominent in biomedical fields. CQDs can be fabricated by “top-down” and “bottom-up” methods, both of which involve oxidation, carbonization, pyrolysis and polymerization. The functions of CQDs include biological imaging, biosensing, drug delivery, gene carrying, antimicrobial performance, photothermal ablation and so on, which enable them to be utilized in antitumour applications. The purpose of this review is to summarize the research progress of CQDs in antitumour applications from preparation and characterization to application prospects. Furthermore, the challenges and opportunities of CQDs are discussed along with future perspectives for precise individual therapy of tumours.
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Affiliation(s)
- Rong Cai
- Central Laboratory, Zhangjiagang TCM Hospital Affiliated to Nanjing University of Chinese Medicine, Suzhou, Jiangsu, 215600, People's Republic of China
| | - Long Xiao
- Central Laboratory, Zhangjiagang TCM Hospital Affiliated to Nanjing University of Chinese Medicine, Suzhou, Jiangsu, 215600, People's Republic of China
| | - Meixiu Liu
- Central Laboratory, Zhangjiagang TCM Hospital Affiliated to Nanjing University of Chinese Medicine, Suzhou, Jiangsu, 215600, People's Republic of China
| | - Fengyi Du
- School of Medicine, Zhenjiang, Jiangsu, 212013, People's Republic of China
| | - Zhirong Wang
- Central Laboratory, Zhangjiagang TCM Hospital Affiliated to Nanjing University of Chinese Medicine, Suzhou, Jiangsu, 215600, People's Republic of China
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Ahmed HB, Abualnaja KM, Ghareeb RY, Ibrahim AA, Abdelsalam NR, Emam HE. Technical textiles modified with immobilized carbon dots synthesized with infrared assistance. J Colloid Interface Sci 2021; 604:15-29. [PMID: 34261016 DOI: 10.1016/j.jcis.2021.07.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 07/01/2021] [Accepted: 07/02/2021] [Indexed: 11/30/2022]
Abstract
Carbon quantum dots "CQDs" were investigated as photo-luminescent nanomaterials as it advantageous with nontoxicity to be alternative for metallic-nanomaterials in different purposes. Therefore, the presented report demonstrates an innovative strategy for industrialization of antimicrobial/fluorescent cotton textiles via exploitation of "CQDs". Unique/novel infrared-assisted technique was currently investigated for clustering "CQDs" form carboxymethyl cellulose. The successive nucleation of "CQDs" (8.0 nm) was affirmed via infra-red, Raman spectroscopy, NMR, TEM and Zeta-potential analysis. The clustered "CQDs" showed antimicrobial and fluorescent characters. The minimal inhibition concentration for "CQDs" (100 mg/mL) against E. coli and C. albicans showed pathogenic reduction of 96% and 82%, respectively. Fluorescent emission spectra for "CQDs" showed two intense peaks at 415-445 nm. "CQDs" were loaded upon pristine and cationized cotton to prepare CQDs@cotton and CQDs@cationized cotton. While, their physical/mechanical properties (air and water vapor permeabilities, tensile strength and elongation %) and thermal stability (TGA & DTG analysis) were studied. The CQDs@cationized cotton exhibited excellent antimicrobial activity with good durability as after ten repretitive washings, inhibition zone diameter against E. coli, was diminished from 21.0 mm to 14.0 mm. The fluorescent emmision intensity was diminished from 741 to 287 after 10 washing cycles. The produced cotton fabrics could be safely used in the medical and military textiles.
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Affiliation(s)
- Hanan B Ahmed
- Chemistry Department, Faculty of Science, Helwan University, Ain-Helwan, Cairo 11795, Egypt.
| | - Khamael M Abualnaja
- Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia.
| | - Rehab Y Ghareeb
- Plant Protection and Biomolecular Diagnosis Department, Air Lands Cultivation Research Institute (ALCRI), City of Scientific Research and Technological Applications (SRTA-CITY), New Borg El-Arab City 21934, Alexandria, Egypt
| | - Amira A Ibrahim
- Plant Protection and Biomolecular Diagnosis Department, Air Lands Cultivation Research Institute (ALCRI), City of Scientific Research and Technological Applications (SRTA-CITY), New Borg El-Arab City 21934, Alexandria, Egypt
| | - Nader R Abdelsalam
- Department of Agricultural Botany, Faculty of Agriculture, Saba Basha, Alexandria University, 21531, Egypt
| | - Hossam E Emam
- Department of Pretreatment and Finishing of Cellulosic Fibers, Textile Research Division, National Research Centre, Scopus affiliation ID 60014618, 33 EL Buhouth St., Dokki, Giza 12622, Egypt.
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11
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Emam HE, Ahmed HB. Antitumor/antiviral carbon quantum dots based on carrageenan and pullulan. Int J Biol Macromol 2020; 170:688-700. [PMID: 33385452 DOI: 10.1016/j.ijbiomac.2020.12.151] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2020] [Revised: 12/10/2020] [Accepted: 12/19/2020] [Indexed: 01/17/2023]
Abstract
Requirement for medication from pathogenic human viruses and cancer diseases are urgently considered, while, numerous reports were focused on investigating easily manufactured and excellently effective therapeutic reagents. Herein, CQDs were prepared with size of 2.1 nm from both of carrageenan and pullulan. CQDs nucleated from pullulan showed higher anti-proliferative effects against cancer cells, while, treatment with 100 μg/mL of CQDs colloids originated from pullulan and carrageenan separately resulted in diminishing of cancer cell viability percent to be 42.1 & 58.7%, respectively. Plaque reduction assay was also affirmed that, 2.5 μg/L of both of pullulan and carrageenan based CQDs exhibited viral inhibition with percent of 44.3& 59.5%, respectively. As a conclusion, pullulan showed seniority over carrageenan in nucleation of CQDs with higher anticancer activities. While, estimation of antiviral performance of the prepared CQDs confirmed the priority of carrageenan compared to pullulan in preparation of CQDs as antiviral laborer.
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Affiliation(s)
- Hossam E Emam
- Department of Pretreatment and Finishing of Cellulosic based Textiles, Textile Industries Research Division, National Research Centre, Scopus affiliation ID 60014618, 33 EL Buhouth St., Dokki, Giza 12622, Egypt.
| | - Hanan B Ahmed
- Chemistry Department, Faculty of Science, Helwan University, Ain-Helwan, Cairo 11795, Egypt.
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12
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Ahmed HB, Emam HE. Environmentally exploitable biocide/fluorescent metal marker carbon quantum dots. RSC Adv 2020; 10:42916-42929. [PMID: 35514886 PMCID: PMC9058413 DOI: 10.1039/d0ra06383e] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Accepted: 11/08/2020] [Indexed: 11/21/2022] Open
Abstract
Carbon quantum dots are currently investigated to act as safe/potent alternatives for metal-based nanostructures to play the role of probes for environmental applications owing to their low toxicity, low cost, chemical inertness, biocompatibility and outstanding optical properties. The synthesis of biocide/fluorescent metal marker carbon quantum dots with hydrophilic character was performed via a quite simple and green technique. The natural biopolymer that was used in this study for the synthesis of carbon quantum dots is fragmented under strong alkaline conditions. Afterwards, under hydrothermal conditions, re-polymerization, aromatization and subsequent oxidation, the carbonic nanostructures were grown and clustered. Dialysis of the so-produced carbonic nanostructures was carried out to obtain highly purified/mono-dispersed carbon quantum dots with a size distribution of 1.5–6.5 nm. The fluorescence intensity of the synthesized carbon quantum dots under hydrothermal conditions for 3 h was affected by dialysis, however, the fluorescence intensity was significantly increased ca. 20 times. The synthesized carbon quantum dots were exploited as fluorescent markers in the detection of Zn2+ and Hg2+. The prepared carbon quantum dots also exhibited excellent antimicrobial potency against Bacillus cereus, Escherichia coli and Candida albicans. The detected minimal inhibitory concentration for the dialyzed CQDs towards the tested pathogens was 350–450 μL mL−1. The presented approach is a simple and green technique for the scaled-up synthesis of biocide/fluorescent marker carbon quantum dots instead of metal-based nanostructures for environmental applications, without using toxic chemicals or organic solvents. Synthesis of biocide/fluorescent metal marker carbon quantum dots with hydrophilic character for the detection of Zn2+ and Hg2+.![]()
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Affiliation(s)
- Hanan B. Ahmed
- Chemistry Department
- Faculty of Science
- Helwan University
- Cairo 11795
- Egypt
| | - Hossam E. Emam
- Department of Pretreatment and Finishing of Cellulosic Based Textiles
- Textile Industries Research Division
- National Research Centre, Scopus Affiliation ID 60014618
- Giza 12622
- Egypt
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