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Preparation of polyaniline iron oxide composite (PANI/Fe 3 O 4 ) for enhanced Congo red removal performance

Materials Today: Proceedings 2021年 46卷 1875-1881页

作者： X.P. Teng M.Y.K. Bryan P.V. Chai J.Y. Law Department of Chemical & Petroleum Engineering Faculty of Engineering Technology & Built Environment UCSI University Cheras Kuala Lumpur 56000 Malaysia Process Engineering Technology Section Universiti Kuala Lumpur Malaysian Institute of Chemical and Bioengineering Technology 78000 Alor Gajah Melaka Malaysia

Composite has emerged as one of the capable materials for wastewater treatment process. Out of many different types of composite, polyaniline/iron oxide (PANI/Fe 3 O 4 ) composite has proven its worth in tackling water pollution attributed to its high surface area and the ability to tune the surface charge of the composite to enhance adsorption performance. In order to produce a high-performance composite, the ratio of PANI/Fe 3 O 4 composite and the operating condition during the removal process should be addressed. Realizing this importance, the present work seeks to alter different PANI concentration on the surface of Fe 3 O 4 nanoparticles to promote Congo red (CR) removal performance and investigate the best operating condition for the adsorbent. First, PANI was synthesized through chemical polymerization method in the presence of ammonium persulfate as oxidizing agents and aniline monomers in acidic medium at low temperature. Then, PANI/Fe 3 O 4 composites were synthesized by physically mixing it with Fe 3 O 4 in acetone medium. Next, characterization of adsorbents was evaluated through Fourier-transform infrared spectroscopy (FTIR). Subsequently, the performance of PANI/Fe 3 O 4 composites at 0/100, 30/70, 50/50, 70/30 and 100/0 ratio were examined, and the results showed that, PANI/Fe 3 O 4 composite at 70/30 ratio achieved the highest CR removal at 89.62% as compared to other PANI/Fe 3 O 4 composite ratio. Besides that, PANI/Fe 3 O 4 composite at 70/30 ratio recorded 6.31% and 2.04% dye removal enhancement as compared to Fe 3 O 4 and PANI adsorbent respectively. Afterward, PANI/Fe 3 O 4 composite performance was evaluated by varying the temperature (25–45 °C), adsorbent dosage (0.01–0.1 g) and dye concentration (20–50 ppm) and results showed that, operating condition at 45 °C, 0.1 g and 20 ppm provide the highest CR removal. The experiment was proceeded with regeneration studies to measure the reusability of the PANI/Fe 3 O 4 composite. The regenerated comp

关键词： Iron Oxide (Fe 3 O 4 ) Polyaniline (PANI) Polyaniline/Iron Oxide Composite (PANI/Fe 3 O 4 ) Congo Red (CR) Regeneration

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In-silico molecular and dynamic analysis of biomarkers against cordycepin from Cordyceps militaris in colorectal cancer

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AIP Conference Proceedings 2024年第1期2923卷

作者： Mohamad Zulkeflee bin Sabri Mohd Azrie Awang Ahmad Azahari Hamzah Khairul Faizal Pa’ee Kelly Yong Tau Len Green Chemistry and Sustainable Technology Cluster Bioengineering Technology Section Universiti Kuala Lumpur Malaysian Institute of Chemical and Bioengineering Technology Lot 1988 Bandar Vendor Taboh Naning 78000 Alor Gajah Melaka Malaysia Faculty of Food Science and Nutrition Universiti Malaysia Sabah Jalan UMS 88400 Kota Kinabalu Sabah Malaysia Green Chemistry and Sustainable Technology Cluster Chemical Engineering Technology Section Universiti Kuala Lumpur Malaysian Institute of Chemical and Bioengineering Technology Lot 1988 Bandar Vendor Taboh Naning 78000 Alor Gajah Melaka Malaysia Green Chemistry and Sustainable Technology Cluster Food Engineering Technology Section Universiti Kuala Lumpur Malaysian Institute of Chemical and Bioengineering Technology Lot 1988 Bandar Vendor Taboh Naning 78000 Alor Gajah Melaka Malaysia

Colorectal cancer (CRC) is notoriously known as the third most common cancer worldwide, and the fourth common cause of death caused by cancer with 700,000 deaths per year. CRC incidence rates were observed to be rising in developing countries including Malaysia, as it was reflected by increased prevalence of risk factors for CRC that are associated with westernization such as unhealthy diet, obesity and smoking prevalence. The fungus family Cordyceps spp. has long been explored in the Traditional Chinese Medicine (TCM) as food, tonic and folk medicine to treat diseases ranging from malaria to cancer. Cordycepin, an active component in Cordyceps militaris were shown to have the anticancer and antimetastatic effect related to its adenosine and its derivatives. In current study, cordycepin inhibitory property against several CRC biomarkers was explored in-silico. Molecular docking and dynamics study of cordycepin against 6 important CRC biomarkers, namely caspase-3, caspase-8, COX-2, IL-2 and IL-6 were performed and its affinity was compared with obatoclax, a Phase II clinical trial antitumor drug which induces apoptosis in cancer cells by functioning as an inhibitor for Bcl-2 family proteins. The result shows that cordycepin is able to act as inhibitors for the selected CRC biomarkers, with equivalent or higher affinity compared to obatoclax. The in-silico prediction study provides a screening platform for the development of anti-CRC drug based on the Cordyceps spp., and in addition, provides a protocol to minimize the laboratory toxicological hazard and promotes the application of green chemistry computing in the drug discovery research.

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Application of date stone activated carbon for the removal of caffeine molecules from water

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Materials Today: Proceedings 2020年 31卷 18-22页

作者： Mohammed Danish Bioengineering Technology Section Universiti Kuala Lumpur-Malaysian Institute of Chemical and Bioengineering Technology Lot No. 1988 Taboh Naning Alor Gajah 78000 Melaka Malaysia

Date stone activated carbon was prepared by impregnating the grounded date stone in 40% phosphoric acid solution. The obtained date stone activated carbon (DSAC) was applied against the caffeine mixed water to scavenge the caffeine molecules from the water. The independent variables such as activated carbon dosage (0.5–10 g/L), contact time (1–80 min), initial concentration of the caffeine (12–260 ppm), and temperature (25–50 °C) were varied and observed its effect on the adsorption efficiency of the DSAC. The recovery of the adsorbed caffeine molecules from the surface of DSAC was also studied with NaOH (0.1 N) solution and hot water. The 8 g/L activated carbon dosage was set for recovery after allowing them to adsorb in 100 ± 3 ppm caffeine solution. The desorption efficiency of date stone activated carbon was observed around 27.90 ± 1.08% for hot water and 28.84 ± 0.64% for NaOH (0.1 N) solution. The date stone activated carbon are an efficient adsorbent, which was applied successfully in scavenging and recovery caffeine from the aqueous solutions.

关键词： Activate carbon Adsorption Caffeine Date stone Dosage Desorption

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Quantifiable identification of flow-limited ventilator dyssynchrony with the deformed lung ventilator model

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Computers in Biology and Medicine 2024年 173卷 108349-108349页

作者： Agrawal, Deepak K. Smith, Bradford J. Sottile, Peter D. Hripcsak, George Albers, David J. Department of Biosciences and Bioengineering Indian Institute of Technology Bombay Maharashtra Mumbai400076 India Department of Bioengineering University of Colorado Denver | Anschutz Medical Campus AuroraCO80045 United States Section of Pulmonary and Sleep Medicine Department of Pediatrics University of Colorado Denver Anschutz Medical Campus AuroraCO80045 United States Division of Pulmonary Sciences and Critical Care Medicine Department of Medicine University of Colorado School of Medicine AuroraCO80045 United States Department of Biomedical Informatics Columbia University New YorkNY10027 United States Department of Biomedical Informatics Univerisity of Colorado Anschutz Medical Campus AuroraCO80045 United States

Background: Ventilator dyssynchrony (VD) can worsen lung injury and is challenging to detect and quantify due to the complex variability in the dyssynchronous breaths. While machine learning (ML) approaches are useful for automating VD detection from the ventilator waveform data, scalable severity quantification and its association with pathogenesis and ventilator mechanics remain challenging. Objective: We develop a systematic framework to quantify pathophysiological features observed in ventilator waveform signals such that they can be used to create feature-based severity stratification of VD breaths. Methods: A mathematical model was developed to represent the pressure and volume waveforms of individual breaths in a feature-based parametric form. Model estimates of respiratory effort strength were used to assess the severity of flow-limited (FL)-VD breaths compared to normal breaths. A total of 93,007 breath waveforms from 13 patients were analyzed. Results: A novel model-defined continuous severity marker was developed and used to estimate breath phenotypes of FL-VD breaths. The phenotypes had a predictive accuracy of over 97% with respect to the previously developed ML-VD identification algorithm. To understand the incidence of FL-VD breaths and their association with the patient state, these phenotypes were further successfully correlated with ventilator-measured parameters and electronic health records. Conclusion: This work provides a computational pipeline to identify and quantify the severity of FL-VD breaths and paves the way for a large-scale study of VD causes and effects. This approach has direct application to clinical practice and in meaningful knowledge extraction from the ventilator waveform data. © 2024

关键词： Biological organs

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Quantification of polyphenols and antioxidant activity in several herbal and green tea products in Malaysia

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Materials Today: Proceedings 2020年 31卷 A106-A113页

作者： Abdullah, Sharifah Soplah Syed Mazlan, Aniss Nuraqilah Section of BioEngineering Technology Universiti Kuala Lumpur Branch Campus Malaysian Institute of Chemical and BioEngineering Technology Vendor City Taboh Naning 78000 Alor Gajah Melaka Malaysia

Herbal tea and green tea are widely consumed around the world as it is believed to have beneficial health effects and contained high amount of antioxidant. Malaysia is rich with various herbal resources which can be transformed into tea. However, there is limited reports available on the antioxidant properties of herbal tea products from Malaysia. Therefore, the polyphenols and antioxidant activity of three green tea and herbal tea products were investigated in this study. The polyphenols content of the tea products were determined by total phenolic content (TPC) and total flavonoid content (TFC). Whilst, the antioxidant activity of the tea samples were determined by ferric reducing antioxidant power (FRAP) assay and 2,2-diphenyl-1-picryl-hydrazyl-hydrate (DPPH) assay. The effects of water volume and steeping period on the antioxidant properties of tea infusion were investigated. Subsequently, the effect of tea infusion storage at 4°C in comparison to the hot tea infusion were studied. The results indicated that green tea has higher polyphenols content and FRAP values as compared to the herbal tea. Interestingly, the storage of the tea infusion at 4°C for 24 h did not significantly affected the polyphenols content in majority of the tea samples. Moreover, the steeping period did not affect the DPPH scavenging but inversely reduced the FRAP values at longer steeping period. TPC and TFC were positively correlated to the antioxidant activity suggest that phenolic compounds and flavanoids could be two of the components responsible for antioxidant activities of these tea infusion. Tea infusion preparation technique is important to preserve antioxidant potency in order to serve its benefit. © 2021

关键词： Antioxidants

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Investigating bacterial infections in Galleria mellonella larvae: Insights into pathogen dissemination and behavior

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Journal of Invertebrate Pathology 2023年第1期200卷 107975页

作者： Admella, Joana Torrents, Eduard Bacterial Infections and Antimicrobial Therapies Group Institute for Bioengineering of Catalonia (IBEC) The Barcelona Institute of Science and Technology (BIST) Baldiri Reixac 15-21 Barcelona 08028 Spain Microbiology Section Department of Genetics Microbiology and Statistics Faculty of Biology University of Barcelona 643 Diagonal Ave. Barcelona 08028 Spain

The insect Galleria mellonella is an alternative animal model widely used for studying bacterial infections. It presents a wide range of advantages, including its low cost, easy maintenance and lack of ethical constraints. Among other features, their innate immune system is very similar to that of mammals. In this study, we dissected several larvae infected with important human pathogens: Mycobacterium abscessus, Staphylococcus aureus and Pseudomonas aeruginosa. By observing the fat body, gut, trachea, and hemolymph under the microscope, we were able to describe where bacteria tend to disseminate. We also quantified the number of bacteria in the hemolymph throughout the infection course and found significant differences between the different pathogens. With this work, we aimed to better understand the behavior and dissemination of bacteria in the infected larvae. © 2023 The Authors

关键词： Bacteria Dissection Galleria mellonella Infection

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Preparation of polyaniline iron oxide composite (PANI/Fe3O4) for enhanced Congo red removal performance

Preparation of polyaniline iron oxide composite (PANI/Fe3O4)...

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2020 Regional Congress on Membrane technology, RCOM 2020 and Regional Conference Environmental Engineering, RCEnvE 2020

作者： Teng, X.P. Bryan, M.Y.K. Chai, P.V. Law, J.Y. Department of Chemical and Petroleum Engineering Faculty of Engineering Technology and Built Environment UCSI University Cheras Kuala Lumpur56000 Malaysia Process Engineering Technology Section Universiti Kuala Lumpur Malaysian Institute of Chemical and Bioengineering Technology Melaka Alor Gajah78000 Malaysia

Composite has emerged as one of the capable materials for wastewater treatment process. Out of many different types of composite, polyaniline/iron oxide (PANI/Fe3O4) composite has proven its worth in tackling water pollution attributed to its high surface area and the ability to tune the surface charge of the composite to enhance adsorption performance. In order to produce a high-performance composite, the ratio of PANI/Fe3O4composite and the operating condition during the removal process should be addressed. Realizing this importance, the present work seeks to alter different PANI concentration on the surface of Fe3O4nanoparticles to promote Congo red (CR) removal performance and investigate the best operating condition for the adsorbent. First, PANI was synthesized through chemical polymerization method in the presence of ammonium persulfate as oxidizing agents and aniline monomers in acidic medium at low temperature. Then, PANI/Fe3O4composites were synthesized by physically mixing it with Fe3O4in acetone medium. Next, characterization of adsorbents was evaluated through Fourier-transform infrared spectroscopy (FTIR). Subsequently, the performance of PANI/Fe3O4composites at 0/100, 30/70, 50/50, 70/30 and 100/0 ratio were examined, and the results showed that, PANI/Fe3O4composite at 70/30 ratio achieved the highest CR removal at 89.62% as compared to other PANI/Fe3O4composite ratio. Besides that, PANI/Fe3O4composite at 70/30 ratio recorded 6.31% and 2.04% dye removal enhancement as compared to Fe3O4and PANI adsorbent respectively. Afterward, PANI/Fe3O4composite performance was evaluated by varying the temperature (25-45 °C), adsorbent dosage (0.01-0.1 g) and dye concentration (20-50 ppm) and results showed that, operating condition at 45 °C, 0.1 g and 20 ppm provide the highest CR removal. The experiment was proceeded with regeneration studies to measure the reusability of the PANI/Fe3O4composite. The regenerated composite managed to retain at high dye removal effi

关键词： Magnetite

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Different micro/nano-scale patterns of surface materials influence osteoclastogenesis and actin structure

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Nano Research 2022年第5期15卷 4201-4211页

作者： Tsukasa Akasaka Miho Tamai Yoshitaka Yoshimura Natsumi Ushijima Shinichiro Numamoto Atsuro Yokoyama Hirofumi Miyaji Ryo Takata Shuichi Yamagata Yoshiaki Sato Ko Nakanishi Yasuhiro Yoshida Department of Biomaterials and Bioengineering Faculty of Dental MedicineHokkaido UniversitySapporo 060-8586Japan Immune Signal Unit Okinawa Institute of Science and Technology Graduate UniversityOkinawa 904-0495Japan Department of Pharmacology Faculty of Dental Medicine and Graduate School of Dental MedicineHokkaido UniversitySapporo 060-8586Japan Support Section for Education and Research Faculty of Dental MedicineHokkaido UniversitySapporo 060-8586Japan Oral Functional Prosthodontics Division of Oral Functional ScienceFaculty of Dental MedicineHokkaido UniversitySapporo 060-8586Japan Department of Periodontology and Endodontology Faculty of Dental MedicineHokkaido UniversitySapporo 060-8586Japan Department of Orthodontics Faculty of Dental Medicine and Graduate School of Dental MedicineHokkaido UniversitySapporo 060-8586Japan

The surface topography of a material can influence osteoclast ***,the surface structural factors that promote osteoclast activity have not yet been investigated in ***,we investigated osteoclastogenesis by testing various defined patterns with different dimensions and *** systematic patterns,made of a cyclo-olefin polymer,were prepared at a micron-,submicron-,and nano-scale with a groove,hole,or pillar shape with a 1:1 pitch ***264.7 cells were cultured on these patterns in the presence of the receptor activator of NF-κB ligand(RANKL).Osteoclast formation was induced in the order:pillar>groove≥*** two-dimensional factors also indicated that submicron-sized patterns strongly induced osteoclast *** optimal pillar dimension for osteoclast formation was 500 nm in diameter and 2μm in ***,we observed two types of characteristic actin structure,i.e.,belt-like structures with small hollow circles and isolated ring-like structures,which formed on or around the pillars depending on size and ***,resorption pits were observed mainly on the top of calcium phosphate-coated ***,osteoclasts prefer convex shapes,such as pillars for differentiation and *** results indicate that osteoclastogenesis can be controlled by designing surfaces with specific morphologies.

关键词： micro/nano-pattern pillar RAW264.7 osteoclast actin structure resorption pit

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Photovoltaic Induced Self-Powered Gas Sensor Based on 2d Mos2 Incorporated Nbse2 Nanorods Heterostructure for Nh3 Gas Sensing at Room Temperature

SSRN

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SSRN 2024年

作者： Saravanan, Adhimoorthy Huang, Bohr-Ran Hwang, Seung-Kyu Kathiravan, Deepa Hsiao, Wesley Wei-Wen Ravichandran, Chitra Abun, Abebaw Hong, Po-Da Mohammadi, Ali Vilian, Ezhil Han, Young-Kyu Huh, Yun Suk Graduate Institute of Electro-Optical Engineering Department of Electronic and Computer Engineering National Taiwan University of Science and Technology Taipei106 Taiwan Department of Materials Science and Engineering National Taiwan University of Science and Technology 43 Keelung road Section 4 Taipei10607 Taiwan Department of Chemical Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan Department of Biological Sciences and Bioengineering Nano Bio High-Tech Materials Research Center Inha University Incheon22212 Korea Republic of Department of Energy and Materials Engineering Dongguk University-Seoul Seoul100-715 Korea Republic of

Two-dimensional (2D) transition metal dichalcogenides (TMDs) have attracted significant attention for their optical and gas-sensing applications due to their exceptional sensitivity. Reliable selectivity and low power consumption are two major requirements for photodetector and gas sensor applications in next-generation electronic devices and the Internet of Things. Self-powered sensors (especially photovoltaic gas sensors) can solve these problems. In this study, for the first time, we propose 2D TMDs (NbSe2-MoS2 hybrid) on a SiO2/Si substrate to fabricate photovoltaic self-powered gas sensors. The gas sensors are operated by the photovoltaic effect of the NbSe2-MoS2 nanostructure, which is prepared using the liquid phase exfoliation process. Initially, it was revealed that the present hybrid material exhibits photovoltaic properties under light illumination, with a circuit current of 0.25 µA and a circuit voltage of 34 mV. The NbSe2-MoS2 nanostructure characteristics were then used for NH3 gas sensing at different concentrations, and the gas sensing response was detected from low (8.8% at 10 ppm) to high (28.8% at 500 ppm) concentrations. The built-in electric field occurred between the NbSe2-MoS2 junction and eventually operated as a driving force for NbSe2-MoS2 gas sensing without an external bias voltage. The physisorption of gas molecules on their surface prompts a charge-transfer mechanism that improves the gas sensor response. The combined outcome of NbSe2-MoS2 heterostructures could pave way to next-generation gas sensing device fabrications. © 2024, The Authors. All rights reserved.

关键词： Molybdenum compounds

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Photovoltaic induced self-powered gas sensor based on 2D MoS2 incorporated NbSe2 nanorods heterostructure for NH3 gas sensing at room temperature

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Chemical Engineering Journal 2024年 491卷

作者： Saravanan, Adhimoorthy Huang, Bohr-Ran Hwang, Seung-Kyu Kathiravan, Deepa Wei-Wen Hsiao, Wesley Jayachitra, Ravichandran Abun, Abebaw Hong, Po-Da Mohammadi, Ali Vilian, A.T. Ezhil Han, Young-Kyu Suk Huh, Yun Graduate Institute of Electro-Optical Engineering and Department of Electronic and Computer Engineering National Taiwan University of Science and Technology Taipei106 Taiwan Department of Materials Science and Engineering National Taiwan University of Science and Technology 43 Keelung road Section 4 Taipei10607 Taiwan Department of Chemical Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan Department of Biological Sciences and Bioengineering Nano Bio High-Tech Materials Research Center Inha University Incheon22212 Korea Republic of Department of Energy and Materials Engineering Dongguk University-Seoul Seoul100-715 Korea Republic of

Two-dimensional (2D) transition metal dichalcogenides (TMDs) have attracted significant attention for their optical and gas-sensing applications due to their exceptional sensitivity. Reliable selectivity and low power consumption are two major requirements for photodetector and gas sensor applications in next-generation electronic devices and the Internet of Things. Self-powered sensors (especially photovoltaic gas sensors) can solve these problems. In this study, for the first time, we report 2D TMDs (NbSe2-MoS2 hybrid) on a SiO2/Si substrate to fabricate photovoltaic self-powered gas sensors. The gas sensors are operated by the photovoltaic effect of the NbSe2-MoS2 nanostructure, which is prepared using the liquid phase exfoliation process. Initially, it was revealed that the present hybrid material exhibits photovoltaic properties under light illumination, with a circuit current of 0.25 µA and a circuit voltage of 34 mV. The NbSe2-MoS2 nanostructure characteristics were then used for NH3 gas sensing at different concentrations, and the gas sensing response was detected from low (8.8 % at 10 ppm) to high (28.8 % at 500 ppm) concentrations. The built-in electric field occurred between the NbSe2-MoS2 junction and eventually operated as a driving force for NbSe2-MoS2 gas sensing without an external bias voltage. The physisorption of gas molecules on their surface prompts a charge-transfer mechanism that improves the gas sensor response. The combined outcome of NbSe2-MoS2 heterostructures could pave way to next-generation gas sensing device fabrications. © 2024 Elsevier B.V.

关键词： Molybdenum compounds

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