Article
Chemistry, Physical
Mohan Singh Mehata
Summary: 7-hydroxyquinoline can exist in different forms and exhibit unique fluorescence properties in water, with metal ions causing fluorescence quenching. The presence of metal ions inhibits keto formation and tautomerization of 7-HQ.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Green & Sustainable Science & Technology
Lijuan Feng, Hui Wang, Tingting Liu, Tiantian Feng, Meng Cao, Jiacheng Zhang, Tao Liu, Zhanhu Guo, Costas Galiotis, Yihui Yuan, Ning Wang
Summary: Strontium-90, a frequently released radioactive product in nuclear reactor waste, poses serious health hazards due to its long half-life and the ability to accumulate in the food chain and bones. However, its identification is challenging due to the absence of characteristic energy rays. In this study, the authors developed a biosensor that uses a fluorogenic dye, thioflavin T, to detect Sr2+ ions with high sensitivity and selectivity. This work provides a technological solution to monitor radioactive strontium pollution and contributes to the sustainability of nuclear power.
NATURE SUSTAINABILITY
(2023)
Article
Chemistry, Analytical
Xu Chu, Tao Chen, Yan Cao
Summary: This paper reports a simple, rapid and sensitive fluorescence sensor using Carbon Dot (CD) as a probe for the parallel determination of Fe3+, Tb3+ and Eu3+ ions. The CD can selectively quench the fluorescence of Fe3+ through non-radiative electron-transfer and enhance the fluorescence of Tb3+ and Eu3+ through the antenna effect. The fluorescence quenching mechanism and energy transfer mechanism were also studied in details.
MICROCHEMICAL JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Ayhan Ungordu
Summary: The metallic complexes containing 8-hydroxyquinoline were theoretically designed to investigate their optoelectronic properties and propose the best structure for devices like OLED. The transport properties of these complexes were determined using the NEGF method, and the best candidate for electronic devices such as nanowires was identified. The compounds studied in this research are considered excellent candidates for next-generation optoelectronic and electronic devices.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Applied
Xiaoxiao Qin, Zhong Zhang, Tian Yang, Li Yuan, Yurong Guo, Xingbin Yang
Summary: This study explored the auto-fluorescence of cellulose paper and identified lignosulfonate as the main source. The fluorescence enhancement behavior in spatial solid phrase was discovered. Mn-doped ZnS quantum dots were used to modify the cellulose paper, resulting in a ratiometric fluorescent paper chip with good morphology, stability, and fluorescence properties. The chip demonstrated different fluorescence responses to three heavy metal ions in water sample, achieving low limits of detection.
Article
Chemistry, Analytical
Xiao Zhou, Tianlin Wang, Minyang Zhao, Pengxiang Wang, Zhe Hao, Xiaodong Lin, Shuo Wang, Yaqing Liu
Summary: The study developed a sensor array consisting of three lanthanide-based fluorescent probes for rapid discrimination of multiple metal ions, showing sensitivity to different oxidation states and excellent recovery in real samples.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Review
Engineering, Multidisciplinary
Ze Yan, Yi Cai, Jing Zhang, Yong Zhao
Summary: The fluorescent sensor array is an emerging method for metal ions detection, with advantages such as excellent sensitivity and high-throughput analysis, capable of simultaneously detecting multiple metal ions. This technology has made progress in recent years, significantly impacting the detection scope and accuracy of metal ions.
Article
Chemistry, Applied
Wei-Guo Jia, Xiao-Dong Li, Xue-Ting Zhi, Rui Zhong
Summary: Mechanochemistry provides a rapid and efficient method for the synthesis of half-sandwich iridium and rhodium complexes, and post-synthetic modification can be carried out to alter their structures. The half-sandwich rhodium complexes exhibit high catalytic activity towards the amide synthesis between aldehydes and hydroxylamine hydrochloride.
APPLIED ORGANOMETALLIC CHEMISTRY
(2022)
Article
Optics
Fenghong Chu, Pengfei Han, Shi Feng, Shuangjiao Wei, Huyong Ma, Zhenglan Bian
Summary: This study presents an aluminum ions sensor based on hydrogel optical fiber doped with lumogallion, showing good linearity and stability in detecting aluminum ions concentration. The sensor has potential applications in the field of biology and medicine due to its biocompatible PEGDA core and cladding.
Article
Engineering, Environmental
Amal E. Mubark, Ahmed A. Eliwa, Salah A. Zaki, Basma T. Mohamed
Summary: In this study, a modified cellulose sorbent was used to investigate the adsorption behavior of vanadium ions. The results showed that the modified cellulose had a high surface area and the adsorption process followed pseudo-second-order kinetics and Langmuir isotherm model. Thermodynamic analysis revealed that the adsorption process was endothermic and spontaneous chemisorption.
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2022)
Article
Chemistry, Multidisciplinary
Yuying Liu, Jiao Chen, Zijun Xu, Hao Liu, Tingting Yuan, Xiyuan Wang, Jianjie Wei, Qingdong Shi
Summary: This study presents a fluorescence sensor array based on carbon quantum dots for detecting heavy metal ions in environmental samples. The sensor array demonstrates high accuracy in detecting multiple metal ions, and the SX-model helps improve the performance through machine learning. The method shows great potential for environmental monitoring of heavy metal pollution.
ENVIRONMENTAL CHEMISTRY LETTERS
(2022)
Article
Biochemistry & Molecular Biology
Mariya Spasova, Nikoleta Stoyanova, Nasko Nachev, Milena Ignatova, Nevena Manolova, Iliya Rashkov, Ani Georgieva, Reneta Toshkova, Nadya Markova
Summary: A new fibrous mat loaded with the model drug 5-nitro-8-hydroxyquinoline was fabricated by electrospinning or electrospinning in conjunction with electrospraying. The material showed antioxidant, antibacterial, and antifungal properties, as well as anticancer efficacy with low toxicity against normal cells. Therefore, it has potential applications in topical wound healing and local cancer therapy.
Article
Pharmacology & Pharmacy
Nadia Ribeiro, Pedro F. Farinha, Jacinta O. Pinho, Hugo Luiz, Janos P. Meszaros, Adelino M. Galvao, Joao Costa Pessoa, Eva A. Enyedy, Catarina Pinto Reis, Isabel Correia, Maria Manuela Gaspar
Summary: The development of new metallodrugs for anticancer therapy has shown promising results in inhibiting colon cancer cell proliferation in vitro, with two metal complexes demonstrating superior efficacy compared to clinically approved drugs.
Article
Materials Science, Multidisciplinary
Fatma M. Amin, Ahmed M. El-Mahalawy, Kholoud T. Abdel-Salam, Mohamed Abdel-Salam
Summary: This research investigates the effects of thickness on the structural, morphological, and optical properties of vacuum thermally deposited zinc 8-hydroxyquinoline (ZnQ2) thin films. The results show that ZnQ2 has a highly stable molecular structure, but the roughness of the film is affected by the thickness. The film roughness decreases until a thickness of 143 nm and then increases again at 185 nm. The optical absorption features, optical energy gap, and refractive index dispersion of the films are analyzed. The results suggest that ZnQ2 thin films with a thickness of 87 nm exhibit the highest linear optical susceptibility, nonlinear optical susceptibility, and nonlinear refractive index, making them suitable for optical switching applications.
Article
Chemistry, Analytical
Ashraf M. M. Mahmoud, Mater H. H. Mahnashi, Mohamed M. M. El-Wekil
Summary: In this study, a novel on-off-on fluorescent probe was developed for sensitive and selective detection of glutathione (GSH). The probe utilized a Cu2+-sulfur quantum dot system (SQ-dots/Cu2+) and the surface reactivity and water solubility of SQ-dots were improved through capping with egg white and bovine serum albumin proteins. The interaction between surface functional groups on the SQ-dots and Cu2+ ions resulted in aggregation-induced quenching, which could be restored by the addition of GSH.
ANALYTICAL METHODS
(2023)
Article
Chemistry, Physical
Yaaser Q. Almulaiky, N. M. Khalil, Yousif Algamal, Adel Al-Gheethi, Abdallah Aissa, Saleh Mohammed Al-Maaqar, Mohamed Himmed, Muhammad Bilal, J. Alkabli, Reda M. El-Shishtawy
Summary: The aim of this study was to investigate and identify the optimal conditions for immobilizing peroxidase on chitosan-decorated alumina-zirconia-titania composites (AZT) activated with glutaraldehyde. Response surface methodology was used to optimize the immobilization conditions, and the results showed that the best immobilization efficiency and enzyme activity were achieved with 40 mg of AZT composites, 1.5% glutaraldehyde, 200 units of enzyme, and a pH of 6.5. The mineralogical structure of the prepared AZT and CS/AZT was studied using X-ray diffraction patterns, while scanning electron microscopy, energy-dispersive X-ray spectroscopy, and Fourier transform infrared spectroscopy were used to analyze the morphological and chemical properties of the immobilized peroxidase on CS/AZT. The study also found that the immobilized peroxidase exhibited a residual activity of 85% after 15 repetitions, and the residual activity of both immobilized and free enzymes after 12 weeks of storage was 81% and 32% of their initial activity, respectively. Based on these findings, it can be concluded that peroxidase immobilization technology is promising for industrial applications.
Article
Biochemistry & Molecular Biology
Reda M. El-Shishtawy, Yasser M. Al Angari, Maha M. Alotaibi, Yaaser Q. Almulaiky
Summary: An innovative method for immobilizing alpha-amylase was developed by treating acrylic fabric with hexamethylene diamine (HMDA) and then coating it with copper ions that were reduced to copper nanoparticles (CuNPs). The immobilized alpha-amylase showed the highest activity at pH 7.0, with CuNPs@HMDA-TA exhibiting the highest immobilization yield of 81.7%. The immobilized enzymes also displayed high stability and retained a significant percentage of their activity after recycling and storage. The immobilized alpha-amylases also improved the total phenolic content of maize kernels by 1.4-fold.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Biochemistry & Molecular Biology
Yasser M. Al Angari, Yaaser Q. Almulaiky, Maha M. Alotaibi, Mahmoud A. Hussein, Reda M. El-Shishtawy
Summary: In this study, polyacrylonitrile (PAN) modified with hexamethylene diamine (HMDA) and glutaraldehyde activation was utilized as a carrier for immobilizing Candida rugosa lipase. The immobilized lipase showed the highest activity at pH 8.0, with a yield of 81% and an activity of 91%. After recycling and storage, the immobilized lipase maintained a significant percentage of its initial activity. The results suggest that synthetically modified PAN is a suitable support for enzyme immobilization and has potential for commercial applications.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Applied
Esam S. Allehyani, Yaaser Q. Almulaiky, Sami A. Al-Harbi, Reda M. El-Shishtawy
Summary: There is an increasing demand for functional textiles, which has led to research on functionalizing acrylic fabrics. In this study, acrylic fabric was functionalized with amidoxime groups and treated with polydopamine and glucose to impart antimicrobial and antioxidant properties. The results showed that the composite nanocoating using PDA-AgNPs exhibited good tensile strength, as well as excellent antioxidant and antimicrobial properties.
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
(2023)
Article
Engineering, Chemical
Reda M. El-Shishtawy, Ahmed Shawky, Reda M. Mohamed
Summary: This study presents a simple method for the synthesis of tungsten oxide (WO3) nanocrystals with the assistance of a soft template, followed by the addition of trace amounts of platinum oxide (PtO) nanodots through precipitation. It is found that the addition of PtO can significantly change the optical and semiconductor properties of WO3, reducing the bandgap energy and enhancing its absorption of visible light. The PtO-decorated WO3 shows excellent photoconversion performance in the synthesis of aniline (AN), with high reusability. This study opens the door for further research on metal oxide-based heterostructures for the production of industrial chemicals.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Laila M. Nhari, Elham N. Bifari, Aisha R. Al-Marhabi, Fatimah A. M. Al-Zahrani, Huda A. Al-Ghamdi, Sameera N. Al-Ghamdi, Abdullah M. Asiri, Reda M. El-Shishtawy
Summary: In this study, the Suzuki-Miyaura cross-coupling reaction was used to synthesize a series of new compounds containing phenothiazine (PTZ), phenoxazine (POZ), carbazole (Cz), and triphenylamine (TPA) as electron donors. The C-C coupling efficiency was found to be higher for electron-rich phenothiazine halides than for phenoxazine and carbazole analogues when coupled with either electron-rich or electron-deficient boronic acid precursors. Furthermore, the coupling efficiency of different boronic acid precursors with substituted phenothiazine halides was dependent on the electronic nature of both PTZ-halide and boronic acid precursors.
JOURNAL OF ORGANOMETALLIC CHEMISTRY
(2023)
Article
Chemistry, Analytical
Fatimah A. M. Al-Zahrani, Huda A. A. Al-Ghamdi, Mohamed A. A. Abdel-Lateef, Reda M. M. El-Shishtawy
Summary: A sensitive and selective phenothiazine-based sensor (PTZ) was synthesized successfully, which showed specific identification of CN- 'turn-off' fluorescence responses with a quick reaction and strong reversibility in a solution of acetonitrile:water (90:10, V/V). The PTZ sensor for detecting CN- has the advantages of quenching the fluorescence intensity, fast response time (60 s), and a low detection limit. It was found that the concentration of CN- authorized for drinking water by WHO is far higher than the detection limit, which is 9.11 x 10(-9). The PTZ sensor demonstrates distinct colorimetric and spectrofluorometric detection for CN- anion due to the binding mechanism of PTZ with CN-.
Article
Chemistry, Physical
Si Mohamed Bouzzine, Alioui Abdelaaziz, Mohamed Hamidi, Fatimah A. M. Al-Zahrani, Mohie E. M. Zayed, Reda M. El-Shishtawy
Summary: The efficiency of newly designed dye-sensitized solar cells (DSSCs) was investigated using density functional theory (DFT) and time-dependent (TD-DFT) methods. The results show that different architectures can modify energy levels, reduce the energy gap, and induce a redshift in absorption. The study calculated the structural geometries, electronic and optical properties of the designed dyes.
Article
Polymer Science
Reda M. M. El-Shishtawy, Yasser M. M. Al Angari, Maha M. M. Alotaibi, Yaaser Q. Q. Almulaiky
Summary: The use of gelatin-capped silver nanoparticles is proposed as a simple and efficient method for detecting reducing sugars in foods. This method not only detects the sugar content, but also determines the content (%) as an alternative to conventional colorimetric methods. The proposed method showed promising results in detecting reducing sugars in fruits such as apple juice, watermelon, and honey.
Article
Green & Sustainable Science & Technology
Fatimah A. M. Al-Zahrani, Badria M. Al-Shehri, Reda M. El-Shishtawy
Summary: In this study, agricultural waste prickly pear fruit peels were successfully transformed into a new adsorbent used to remove dye. The adsorbent showed a porous structure and a fair surface area, and its effectiveness in removing dye was evaluated under different conditions. The results showed that the adsorbent achieved more than 95% removal efficiency within 60 minutes. This work provides a rapid and simple method for converting biomass waste and utilizing it for pollutant removal.
Article
Materials Science, Multidisciplinary
M. A. Zayed, M. A. Hussein, R. M. El-Shishtawy, S. M. Albukhari, W. A. El-Said, E. A. Elshehy
Summary: Potentiometric sensing of oxyanions such as arsenate was achieved using a self-assembly engineered and chemically responsive molybdenum dioxide grafted polyaniline (PANI/MoO3) plated ITO glass electrode. Characterization techniques were used to determine the impact of molecular architecture on the structure, morphology, and physical characteristics of PANI/MoO3, confirming enhanced crystallinity, adsorption capacity, and responsiveness. The LOD for As(V) ion detection using the PANI/MoO3 composite/ITO electrode was found to be 0.15 ppb, and the sensing mechanism, charge transfer, and shifting characteristics were elucidated through the interaction between arsenate and molybdate oxyanions. The electrode's analytical performance in detecting residual arsenate in diverse environmental samples was also investigated.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Multidisciplinary
O. F. Al Sharif, L. M. Nhari, R. M. El-Shishtawy, A. M. Asiri
Summary: Imidazole is an essential building block in biological, optical, and electrical fields due to its unique bipolar configuration, which enhances the functionality of its derivatives. These imidazole-based fluorophores have characteristics such as simple synthesis, low cost, and high performance, making them suitable for optical applications such as sensing and organic light emitting diodes. Furthermore, they also exhibit exciting characteristics like aggregation-induced emission and mechanofluorochromism, which broaden their potential applications in electroluminescence and bio-imaging.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Chemistry, Physical
Sultan A. Al-horaibi, Abdel-Basit. Al-Odayni, Abdulmajeed. Alezzy, Mohammed. ALSaeedy, Waseem. Saeed, Ahmed Hasan, Reda M. El-Shishtawy
Summary: This study synthesized two novel squaraine dyes SQI-P and SQI-H and employed them as near-infrared (NIR) sensitizers in dye-sensitized solar cells (DSSC). The experimental results showed that the SQI-P/SQI-H sensitizer exhibited strong absorption in the NIR region, improved electron injection efficiency, and excellent photostability. By optimizing the co-sensitized DSSC, the combination of the NIR-absorbing squaraine-based indoline with SQI-P achieved a high photocurrent output of 22.3 mA/cm2 at an efficiency of 4.8%, representing a breakthrough for DSSCs in the NIR region.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Physical
Elham N. Bifari, Paulo Almeida, Reda M. El-Shishtawy
Summary: Global warming and rising energy needs have spurred interest in alternative energy technologies. Dye-sensitized solar cells, particularly those using cyanine and hemicyanine-based organic photosensitizers, offer potential for cost-effective photovoltaic energy conversion. This article reviews the latest advances in the structural design and synthetic approaches, as well as the performance and photophysical characteristics of these photosensitizers. Strategies for utilizing them in solar cells and the potential for optimizing the conversion efficiency of photovoltaic cells are also discussed.
MATERIALS TODAY ENERGY
(2023)
Article
Biotechnology & Applied Microbiology
Fatimah A. M. Al-Zahrani, Salem S. Salem, Huda A. Al-Ghamdi, Laila M. Nhari, Long Lin, Reda M. El-Shishtawy
Summary: In this study, silver/iron oxide nanocomposites (Ag/Fe2O3) were successfully phytosynthesized using the extract of Buddleja lindleyana. The nanocomposites exhibited a triangular and spherical morphology and showed broad spectrum antimicrobial activity against bacterial pathogens.
BIOENGINEERING-BASEL
(2022)
