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SSRN 2024年

作者： Neuzil, Pavel Brodsky, Jan Gablech, Imrich Yu, Hsiao-Hua Ying, Jackie Y. Brno University of Technology School of Electrotechnology Technicka 10 Brno616 00 Czech Republic Institute of Bioengineering and Nanotechnology 31 Biopolis Way The Nanos 138669 Singapore Smart Organic Materials Laboratory Institute of Chemistry Academia Sinica No. 128 Section 2 Research Institute Road Nankang Taipei11529 Taiwan Department of Bioengineering King Fahd University of Petroleum & Minerals Dhahran31261 Saudi Arabia Key Laboratory of Micro Nano Systems for Aerospace

This study presents an innovative integrated electrochemical system for droplet-based electropolymerization and sensor applications. The system features a circular geometry and uses perfluorocarbon-based hydrophobic material to facilitate droplet formation, thus requiring only microliters of solution. The methodology includes a detailed fabrication process of the electrochemical chips and demonstrates the versatility of the device in both aqueous and non-aqueous electropolymerization. The results show successful material deposition and characterization, with the system proving effective for miniaturized sensor applications. This approach significantly reduces the volume of required materials, offering a more economical and efficient alternative for developing new sensor materials and applications. © 2024, The Authors. All rights reserved.

关键词： Electropolymerization

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Graphene-metal sulfide composite based gas sensors for environmental sustainability: A review

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Sensors International 2024年第1期5卷 100269-100269页

作者： Balram, Deepak Lian, Kuang-Yow Sebastian, Neethu Kumar, Vineet Yadav, Virendra Kumar Patel, Ashish Singh, Kulvinder Department of Electrical Engineering National Taipei University of Technology No. 1 Section 3 Zhongxiao East Road Taipei106 Taiwan Institute of Organic and Polymeric Materials Department of Molecular Science and Engineering National Taipei University of Technology No. 1 Section 3 Zhongxiao East Road Taipei106 Taiwan Department of Biotechnology School of Bioengineering and Biosciences Lovely Professional University Punjab Phagwara144111 India Department of Life Sciences Hemchandracharya North Gujarat University Gujarat Patan384265 India Department of Chemistry DAV College Sector 10 UT Chandigarh160011 India

In this modern era, maintaining a sustainable environment is pivotal and hence, a detailed review on gas sensors for quantification of toxic environmental pollutants is critical. In this paper, an extensive review on advancements in gas sensors developed using graphene-metal sulfide composites is discussed. Although graphene is an intriguing material with high sensitivity for determination of gases at low concentrations, its poor selectivity is a hindrance towards fabrication of high-performance gas sensors. Hence, hybrid nanocomposites prepared by embedding graphene and its derivatives with various metal sulfides including molybdenum sulfide (MoS2), tin sulfide (SnS2), tungsten sulfide (WS2), cadmium sulfide (CdS) etc. were utilized in gas sensor fabrication with enhanced sensing capabilities. Related investigations revealed that gas sensors using graphene-metal sulfide nanohybrids could be effectively used in detection of individual molecules of toxic gas including NOx, NH3, H2S, SO2, HCHO, CO2, CO, CH4, C3H6O and so on at very low concentrations with good sensitivity and selectivity. A comparative evaluation of various performance parameters revealed that toxic gases were determined with a limit of detection and concentration as low as 0.6 ppb and 0.05 ppm respectively, using graphene-metal sulfide based gas sensors. This review reflects the fact that advancements in material synthesis has led to improvement in gas sensing performances as evidenced from the comparatively better performance metrics reported in recently published articles which utilized hybrid nanocomposites as sensing material. © 2023 The Authors

关键词： Graphene

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Magnetic chitosan hydrogel beads as adsorbent for copper removal from aqueous solution

Magnetic chitosan hydrogel beads as adsorbent for copper rem...

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International Symposium on Polymeric Materials 2022, ISPM 2022

作者： Afifah Khalil, Nor Syafiqah Abdul Rahman, Aida Mubin Abu Huraira, Alnazirul Nur Dalillah Fattin Janurin, Siti Noor Syimir Fizal, Ahmad Ahmad, Norkhairi Zulkifli, Muzafar Sohrab Hossain, Md. Naim Ahmad Yahaya, Ahmad Universiti Kuala Lumpur Branch Campus Malaysian Institute of Chemical and BioEngineering Technology Alor Gajah Melaka78000 Malaysia Student Development Section Branch Campus Malaysian France Institute Universiti Kuala Lumpur Bandar Baru Bangi Selangor43650 Malaysia Aero Composite Cluster Universiti Kuala Lumpur Branch Campus Malaysian Institute of Aviation Technology Dengkil Selangor43400 Malaysia HICoE-Centre for Biofuel and Biochemical Research Institute of Self-Sustainable Building Fundamental and Applied Sciences Department Universiti Teknologi PETRONAS Seri Iskandar Perak32610 Malaysia Green Chemistry and Sustainability Cluster Universiti Kuala Lumpur Branch Campus Malaysian Institute of Chemical and BioEngineering Technology Alor Gajah Melaka78000 Malaysia

Magnetic chitosan hydrogel beads (MCHB) were synthesized by blending chitosan and magnetite (Fe3O4) in sodium alginate solution. The MCHB was used to remove Cu (II) metal ions in an aqueous solution. The performance of MCHB to remove Cu (II) ions was evaluated experimentally at different parameters (the initial pH of the solution, contact time, and various magnetite ratios of the hydrogel beads) in the batch adsorption set-up. This study indicated that MCHB managed to remove Cu (II) ions by adsorption at pH 5 at 24 h of contact time. The hydrogel beads of MCHB-0.5 (C:M:A ratio by weight of 1:0.5:2) show the highest Cu (II) ions removal efficiency of 56.51%. The addition of magnetite at the minimal ratio does not hinder the adsorption of Cu (II) ions onto MCHB. The magnetite in the beads also eases the separation of the hydrogel beads from the solution by an external magnet after treatment. © 2022 Elsevier Ltd. All rights reserved.

关键词： Magnetite

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Mannuronan C5-epimerases for tailored seaweed alginate modification

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Algal Research 2025年 90卷

作者： Jan Muschiol Morten Schiøtt Maria Dalgaard Mikkelsen Anne S. Meyer Section for Protein Chemistry and Enzyme Technology Department of Biotechnology and Biomedicine (DTU Bioengineering) Technical University of Denmark Kongens Lyngby Denmark

Alginate is a linear polysaccharide composed of (1 → 4)-linked β-D-mannuronate (M) and its C5-epimer α-L-guluronate (G) distributed in blocks of mainly MM-, GG- or alternating MG-residues. Alginate is found in the cell walls of brown macroalgae (seaweed, class Phaeophyceae), but is also produced by certain bacterial species within the Pseudomonas and Azotobacter genera. Due to its hydrocolloid and gelation properties, alginate is widely used in foods and healthcare products, e.g. for moisture control in band-aids. The gelation properties of alginate are determined by the G-residues, i.e. the so-called GG blocks, through interactions with cations, particularly Ca 2+ . In brown macroalgae alginate is first produced as poly-M molecules (mannuronan). During cell wall adaptation and maturation, the M-residues are modified by mannuronan C5-epimerases, EC 5.1.3.37, which convert some of the M-residues to G-residues by catalyzing the “flipping” of the C5 group. While the G:M ratio varies by macroalgal species and geographic location, mature alginates usually contain more G-residues and have better gelation properties, whereas brown macroalgae cultivated in calm water, including those now farmed in the Northern Hemisphere, typically have a low G:M ratio. The interest in using microbial mannuronan C5-epimerases to improve the gelation properties and thus increase the application value of alginate from cultivated brown macroalgae is therefore increasing. The structure and catalytic properties of different microbial mannuronan C5-epimerases, especially those of Azotobacter vinelandii , have been studied for decades. Recently, extensive product profiling and recombinant production of macroalgal C5-epimerases have also been reported. In this review we present detailed descriptions of mannuronan C5-epimerases, including the microbial, macroalgal, and mutated enzymes characterized so far, focusing on reaction mechanisms, enzyme types, assays, modular structure-function properties,

关键词： Seaweed polysaccharides Enzymatic epimerization Hydrocolloids Epimerase assays Marine bioactive compounds Product profile

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Photocatalytic C-H Chlorination by Corrole Chelated Post-Transition Metal Complexes

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SSRN 2024年

作者： Zhan, Xuan Kim, Donghyeon Ullah, Zakir Churchill, David G. School of Chemical Engineering and Technology Sun Yat-sen University Zhuhai519082 China Daejeon34141 Korea Republic of Consejo Superior de Investigaciones Científicas Campus Universitari de Bellaterra Cerdanyola del Vallès08193 Spain Daejeon34141 Korea Republic of Therapeutic Bioengineering Section Daejeon34141 Korea Republic of

Corroles have rarely been explored for mainstream photocatalytic photosensitizers despite their easily–tunable and excellent photophysical and electrochemical properties. The previously reported highly oxidizing photo–catalyst, the penta–CF3 substituted phosphorus corrole P–(CF3)5, has emerged as an effective catalyst for the chlorination of phenol and similar natural compounds. Interestingly, the reaction of toluene predominantly yields benzaldehyde rather than benzyl chloride. Both experimental and theoretical (DFT) investigations were conducted to elucidate the underlying mechanism of this transformation. © 2024, The Authors. All rights reserved.

关键词： Chlorination

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Fat reduction and characteristic enhancement of edible composite coating (Pectin-Maltodextrin) on fried potato chips 4

Fat reduction and characteristic enhancement of edible compo...

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4th International Conference on Green Chemical Engineering and technology: Materials Science, GCET 2019

作者： Mohamed Latif, Nur Afiqah Mat Ropi, Anis Alysha Dos Mohamad, Abdul Manan Shaharuddin, Shahrulzaman Section of Food Engineering Technology Universiti Kuala Lumpur Malaysian Institute of Chemical and Bioengineering Technology Lot 1988 Vendor City Taboh Naning Alor Gajah Melaka78000 Malaysia

Frying potato chips developed a tasty product with crispy, tempting aromas and excellent appeal of potato chips, but high oil content in deep-fry potato chips will increase adverse health effect to the consumer. This research was conducted to evaluate the effect of the composite coating (pectin-maltodextrin) of potato chips characteristics at different ratios (uncoated, 100:0, 90:10, 80:20, 70:30 60:40 and 50:50 or named as sample 1, 2, 3, 4, 5, 6 and 7, respectively). The potato chips were coated using dipping method and characterized through evaluations of fat content, moisture content, texture and sensory. Sample 6 (60:40) has the significant highest fat reduction (9.69%) among the samples. The moisture content for all samples were not significantly different (P>0.05). Coated potato chip of sample 4 (80:20) has the highest breaking force (2.78±0.07N) compared to uncoated potato chip (2.24±0.13N). The sensory evaluation showed that coated potato chips were preferable compared to uncoated potato chips. In conclusion, composite (pectin-maltodextrin) coated potato chips obtained enhanced characteristics including significant fat reduction, improving texture and sensory acceptability. © 2020 Elsevier Ltd. All rights reserved.

关键词： Moisture

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Influence of syringe and needle sizes on production time and size of microencapsulated bead of Lactobacillus Plantarum-sodium alginate-banana peel 4

Influence of syringe and needle sizes on production time and...

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4th International Conference on Green Chemical Engineering and technology: Materials Science, GCET 2019

作者： Samat, Nur Amirah Hanafi, Siti Nurhana Shaharuddin, Shahrulzaman Section of Food Engineering Technology Universiti Kuala Lumpur Malaysian Institute of Chemical and Bioengineering Technology Lot 1988 Vendor City Taboh Naning Alor Gajah Melaka78000 Malaysia

The objective of the study was to evaluate the influence of syringe and needle sizes on production time and bead size of Lactobacillus plantarum-sodium alginate-banana peel. The bead was produced using the extrusion method. The 25G and 23G of needles produce 0.5mm to 1mm and 1mm to 2mm bead size, respectively. No different of bead sizes were observed when different syringe size was used. Higher internal diameter of syringe needle and smaller syringe size produced bead in fastest processing time (1min). The extrusion using 23G syringe needle and 10ml syringe obtained smallest bead size and fastest processing time. This crucial information could further optimise the extrusion process and future up-scaling process. © 2021 Elsevier Ltd.

关键词： Needles

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Textural properties, cooking loss and syneresis of chicken meatballs using carboxymethylated sago starch and isolated soy protein blends

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AIP Conference Proceedings 2024年第1期2923卷

作者： Shamini Nair Achudan Abdul Manan Dos Mohamed Abbas F. M. Alkarkhi Section of Food Engineering Technology Malaysian Institute of Chemical & Bioengineering Technology Universiti Kuala Lumpur 78000 Alor Gajah Melaka Malaysia Section of Economic and Law Universiti Kuala Lumpur Business School 50250 Kuala Lumpur Malaysia

This study was carried out to determine the cooking loss and textural properties between fresh and 30 days stored chicken meatballs. Chicken meatballs were prepared by substituting isolated soy protein (ISP) with a different blend of carboxymethylated sago starches. Modified starch was derived from a top (TMSS) or bottom (BMSS) part of the sago palm. It was added by 1%, 2% or 3% in the total formulation. A factorial design with five levels of added modified sago starch and ISP blend (0:100, 25:75, 50:50, 75:25, and 100:0) was applied to each percentage. There was a significant difference noted in cooking loss and textural properties between different percentages for both types of carboxymethylated sago starch. The cooking loss results revealed that chicken meatballs blended with TMSS showed minimal losses during cooking either in fresh or after 30 days of storage for all three percentages. Textural profile analysis for fresh and 30 days stored chicken meatballs showed 100% ISP addition produced higher textural attributes than BMSS or TMSS in all three percentages. However, chicken meatballs containing 25 ratios of BMSS and TMSS established comparable textural properties as 100% ISP. Substitution of ISP with (25 and 50) ratio of TMSS showed comparable quality as 100% ISP blend in cooking loss and textural properties of chicken meatballs.

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Particle size distribution of sago starch obtained from different palm (Metroxylon sagu Rottb.) maturity stages and soil types

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AIP Conference Proceedings 2024年第1期2923卷

作者： Shamini Nair Achudan Abdul Manan Dos Mohamed Abbas F. M. Al Karkhi Rinani Shima Abd Rashid Section of Food Engineering Technology Malaysian Institute of Chemical & Bioengineering Technology Universiti Kuala Lumpur 78000 Alor Gajah Melaka Malaysia Section of Economic and Law Universiti Kuala Lumpur Business School 50250 Kuala Lumpur Malaysia

This research was conducted to study the effect of different commercial palm maturity stages namely, Plawei Manit (11.5 years), Bubul (12 years) and Angau Muda (12.5 – 13 years) and different soil types (Peat soil, Semi-peat soil and Mineral soil) on particle size distribution in sago starch segmented into top and bottom palm. Particle size analyzer was used to determine D10, D50 and D90 as well as volume-weighted mean (D4,3). The analysis showed significant differences for both types of soils and types of starches. Particle size was found to be larger in sago starch planted on mineral soil than other types of soils. Then, the bottom part showed a bigger particle size than the top section while the Bubul growth stage contained a larger particle size than other growth stages. A synergistic interaction for the particle size distribution of sago starch was produced between different types of starches and soils. The results showed that sago palm cultivated from different types of soils, different growth stages and a different section of palm produced distinctive particle size distribution. This study facilitates the processing of various sago starch types with a more homogenous particle size distribution. Thus, it can be used to provide feasible means in the selection and categorization of sago palms for distinctive application.

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

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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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