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Anticorrosion properties of momilactone A isolated from rice hulls
Prabakaran, M.,Kim, S.H.,Oh, Y.T.,Raj, V.,Chung, I.M. Korean Society of Industrial and Engineering Chemi 2017 Journal of industrial and engineering chemistry Vol.45 No.-
<P>Momilactone A was isolated from rice hulls (Oryza sativa L.) using ethyl acetate as the solvent. Momilactone A has been investigated as a green inhibitor for the very first time. The result confirm highly efficient inhibition of the proposed isolated compound. As long as we know this is the first rice hull isolated compound to be reported for green inhibition properties. Mild steel is widely used in many industries. The corrosion inhibition of mild steel in 1 M HCl solution using momilactone A has been studied using electrochemical studies. Momilactone A maximum inhibition efficiency of 88% was achieved by using 1000 ppm. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Recently developed applications for natural hydrophilic polymers
Halake, K.,Kim, H.J.,Birajdar, M.,Kim, B.S.,Bae, H.,Lee, C.,Kim, Y.J.,Kim, S.,Ahn, S.,An, S.Y.,Jung, S.H.,Lee, J. Korean Society of Industrial and Engineering Chemi 2016 Journal of industrial and engineering chemistry Vol.40 No.-
<P>Natural hydrophilic polymers have been utilized for a variety of applications, ranging from the food industry to the coatings industry. However, recent social needs have demanded rapid progress with regard to medical and environmental applications. Natural hydrophilic polymers have attracted considerable interest due to their physicochemical properties and useful functions. This report explores recent findings made in medical, environmental, and food applications of natural hydrophilic polymers and their modified polymers. Applications of these materials are based on their intrinsic biocompatibility, biodegradability, and non-toxicity. Advances in the chemical modification of natural polymers as well as new source developments are overcoming the physicochemical property limits and high costs of these materials, opening up new opportunities for the development of future applications. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Rajan Unnithan, A.,Ramachandra Kurup Sasikala, A.,Park, C.H.,Kim, C.S. Korean Society of Industrial and Engineering Chemi 2017 Journal of industrial and engineering chemistry Vol.46 No.-
<P>The present study explores the first ever fabrication of graphene oxide (GO)Chitosan (CS)Hyaluronic acid (HA) based bioactive composite scaffold containing an osteogenesis-inducing drug simvastatin (SV) for bone tissue engineering application. Porosity, density, swelling, degradation and biomineralization studies favored the SV loaded GOCSHA scaffold in comparison to the conventional CS and HA based scaffolds. The in vitro results showed that the SV also offers a significant influence on osteogenesis and biomineralization and it possess excellent biocompatibility to be used as a bone tissue engineering scaffold, which is able to persuade osteogenesis and mineralization. (C) 2016 Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry.</P>
Seo, C.K.,Choi, B. Korean Society of Industrial and Engineering Chemi 2015 Journal of industrial and engineering chemistry Vol.25 No.-
The purpose of this study is to investigate the physicochemical characteristics according to hydrothermal aging, sulfur poisoning and HCs co-existence of Fe-zeolite (1), (2) and V<SUB>2</SUB>O<SUB>5</SUB>-WO<SUB>3</SUB>-TiO<SUB>2</SUB> SCR which are appropriate for diesel engines. Fe-zeolite (1) is a zeolite with low Fe content (~1wt.%) while Fe-zeolite (2) is a zeolite with a high Fe content (1.8wt.%). The BET specific surface area of Fe-zeolite (2) was smaller than that of Fe-zeolite (1) but its NH<SUB>3</SUB> storage capacity was larger than Fe-zeolite (1) because Fe-zeolite (2) has a large amount of Al content that can absorb NH<SUB>3</SUB>. In the case of Fe-zeolite (2), thermal durability was strong, When mildly set in hydrothermal aging for 12 and 24h at 600 and 700<SUP>o</SUP>C respectively, the NOx conversion rate was higher than the Fresh catalyst above 350<SUP>o</SUP>C. The active site of the catalyst, which is an Fe site, was damaged during the hydrothermal aging process, resulting in a decline in low-temperature performance. However, at higher temperatures, the NH<SUB>3</SUB> oxidation was largely hindered by the damage to the Fe site. The highest degree of coking arose for Fe-zeolite (1). On the other hand, V<SUB>2</SUB>O<SUB>5</SUB>-WO<SUB>3</SUB>-TiO<SUB>2</SUB> SCR, exhibited high durability against HCs, and experienced less coke deposition. Of the three catalysts V<SUB>2</SUB>O<SUB>3</SUB>-WO<SUB>3</SUB>-TiO<SUB>2</SUB> SCR suffered the least sulfur poisoning (0.007g/L). Due to the effects of Bronsted acid site, its resistance to sulfur poisoning is sufficient for reduction catalysts for exhaust gases from ship engines.
Gelatin-based extracellular matrix cryogels for cartilage tissue engineering
Han, M.E.,Kang, B.J.,Kim, S.H.,Kim, H.D.,Hwang, N.S. Korean Society of Industrial and Engineering Chemi 2017 Journal of industrial and engineering chemistry Vol.45 No.-
<P>In this study, gelatin-based cryogels were fabricated by mixing methacrylated gelatin (GelMA) with methacrylated hyaluronic acid (MeHA) or methacrylated chondroitin sulfate (MeCS) for cartilage tissue engineering. In vitro revealed that MeCS incorporated gelatin-based cryogel (G-MeCS) showed significant cartilaginous tissue stimulation. Furthermore, the cell-laden gelatin-based ECM cryogels were implanted into mouse subcutaneous tissue for 6 weeks and displayed uniform distribution of cells with normal phenotype maintenance. Finally, when these cryogels were implanted into osteochondral defect of New Zealand white rabbit, full integration with host tissue and increased cellularity were observed with G-MeCS cryogel. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Bae, H.,Lee, J. Korean Society of Industrial and Engineering Chemi 2016 Journal of industrial and engineering chemistry Vol.40 No.-
<P>The optimal design of an electrospun scaffold for tissue engineering is contingent on its functionality to mimic the native extracellular matrix (ECM) as much as possible. Using core-sheath particles for encapsulation, the scaffolds of particle-fiber hierarchical structures could play the dual roles of structural matrix and controlled delivery system of active ingredients. Herein, electrohydrodynamic jetting of countercharged nozzles was investigated to combine fibers and core-sheath particles based on the neutralization phenomenon between electrospun poly(L-lactide-co-D,L-lactide) fibers and electro-sprayed poly(lactide-co-glycolide) particles. It was revealed that the key features of particle-fiber composites could be conveniently designed by controlling the composition of the binary mixture of ethyl acetate and benzaldehyde (BA) for electrospraying. With an increase in the BA concentration, the areal density of the particles on the fibers (degree of combination) increased threefold, and the total loading amount of lysozyme (model active ingredient) also increased threefold, while particle size and fiber diameter did not change significantly. The composites prepared from a high BA content case provided sustained release profiles, which are independent from the degradation kinetics of fibers, such that lysozyme could be released for more than a month. The use of a binary solvent mixture for this process seems to be an effective strategy for developing future functional scaffolds for tissue engineering. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Park, >,.,Lee, S.J.,Jo, H.H.,Lee, J.H.,Kim, W.D.,Lee, J.Y.,-→Park, S.A. Korean Society of Industrial and Engineering Chemi 2017 Journal of industrial and engineering chemistry Vol.46 No.-
<P>beta-tricalcium phosphate (beta-TCP) and polycaprolactone (PCL) composites were manufactured using the lab-made 3D bioprinting system to produce 50TCP50PCL (50% beta-TCP with 50% PCL) and 70TCP30PCL (70% beta-TCP with 30% PCL) composite scaffolds for bone tissue engineering. The 70TCP30PCL scaffold containing the highest beta-TCP content exhibited rougher morphologies and more porous than the other scaffolds (i.e., PCL and 50TCP50PCL). In vitro studies revealed that cell proliferation and alkaline phosphate activity were improved on the beta-TCP-based composite scaffolds. Our results suggest that our 3-D printed beta-TCP-containing PCL scaffolds would benefit new dental applications or regeneration therapies. (C) 2016 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Solar-to-chemical conversion platform by Robust Cytochrome P450-P(3HB) complex
Lee, J.H.,Nam, D.H.,Lee, S.H.,Park, J.H.,Park, C.B.,Jeong, K.J. Korean Society of Industrial and Engineering Chemi 2016 Journal of industrial and engineering chemistry Vol.33 No.-
<P>Cytochrome P450 monooxygenases which catalyze a remarkable variety of oxidative transformation are of exceptional interest for the synthesis of fine chemicals. However, due to the instability and requirement of expensive cofactor, P450s have yet to be extensively used for industry. Here, we developed a new platform that combines a solar-driven cofactor regeneration and immobilization of P450 on biopolymer. Through photochemical cofactor regeneration using eosin Y as a photosensitizer, P450-P(3HB) complex successfully catalyzed a O-dealkylation reaction. Furthermore, using the P450-P(3HB) complex and a solar-tracking module, we achieved a P450-catalyzed reaction under natural sunlight for four consecutive days in a preparative scale. (C) 2015 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Padmanaban, Sudakar,Kim, Minog,Yoon, Sungho THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2019 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.71 No.-
<P><B>Abstract</B></P> <P>Engineering the surface of Metal-organic frameworks (MOFs) will afford to advantageously improve their performances in catalysis. A particular example of industrially applied MOF-based catalysis is the zinc glutarate (ZnGA) catalyzed copolymerization of CO<SUB>2</SUB> with an epoxide. Herein, we demonstrate how the modification of the surface of ZnGA aids to enhance its productivity in fixing CO<SUB>2</SUB> into poly(alkylene carbonates), and deliver an industrially viable procedure to prepare a nanosized, surface-etched ZnGA by systematically controlling the reaction conditions and by using a mild-HCl solution. This surface modified-ZnGA exhibits ∼83% increased productivity than the standard-ZnGA and thus could be readily applicable in industries.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Y.C.,Kim, E.J.,Shin, H.J.,Choi, M.,Yang, J.W. Korean Society of Industrial and Engineering Chemi 2012 Journal of industrial and engineering chemistry Vol.18 No.3
Fluoride (F<SUP>-</SUP>), nitrate (NO<SUB>3</SUB><SUP>-</SUP>), and phosphate (PO<SUB>4</SUB><SUP>n-</SUP>) anions are produced in large quantities by the use of cleaning agents in the electronics industry. Because of their high solubility in water and harmful impact on the environment, the development of an efficient treatment process for anionic species has been gaining increased attention. In this study, aminoclays with centered cationic metal ions, including Mg<SUP>2+</SUP>, Al<SUP>3+</SUP>, and Fe<SUP>3+</SUP>, were synthesized by a one-pot sol-gel reaction, and removal of F<SUP>-</SUP>, NO<SUB>3</SUB><SUP>-</SUP>, and PO<SUB>4</SUB><SUP>3-</SUP> by the synthesized aminoclays was evaluated in an anion mixture system. The aminoclays resulted in exfoliated dispersions with high-density amino groups in aqueous solution. Among the anions studied, phosphate was preferentially removed by the aminoclays, which suggests that anion removal by aminoclays was mainly achieved by the electrostatic interactions between anions and aminoclays. Compared with aminopropyl-functionalized silica gel (average diameter: 40-63μm), aminoclays showed higher anion removal efficiencies.