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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>
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>
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>
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>
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>
Effective parameters for DME steam reforming catalysts for the formation of H<sub>2</sub> and CO
Park, S.,Kim, H.,Choi, B. Korean Society of Industrial and Engineering Chemi 2010 Journal of industrial and engineering chemistry Vol.16 No.5
Recently, DME has received attention as a clean fuel and is now considered an alternative fuel for diesel engines. DME diesels need de-NOx catalysts such as LNT (Lean NOx Trap) and SCR (Selective Catalytic Reduction) systems. DME is an attractive source of hydrogen because it can be stored easily and is a good transportation fuel. Hydrogen and CO enriched gas as a reductant was used with the LNT catalyst in order to reduce NOx emissions. The steam reforming catalyst of DME was used to formation of hydrogen. It has been reported that Cu-based catalysts have high selectivity and activity in the steam reforming of DME. This research used 600cPsi cordierite as a catalyst, which was coated with copper. The catalysts were made via a sol-gel and impregnation methods. The formation of H<SUB>2</SUB> and CO under the prepared catalysts was tested by a model gas. Experimental parameters were considered; the space velocity (SV) and concentrations of H<SUB>2</SUB>O, O<SUB>2</SUB>, and CO<SUB>2</SUB> were evaluated. The Cu 30%/γ-Al<SUB>2</SUB>O<SUB>3</SUB> catalyst from the sol-gel method exhibited high and stable activity in the production of hydrogen from the steam reforming of DME. Both DME conversion and the selectivity of hydrogen were affected by SV and the concentrations of H<SUB>2</SUB>O, O<SUB>2</SUB>, and CO<SUB>2</SUB>2.
Jeong, J.,Antonyraj, C.A.,Shin, S.,Kim, S.,Kim, B.,Lee, K.Y.,Cho, J.K. Korean Society of Industrial and Engineering Chemi 2013 Journal of industrial and engineering chemistry Vol.19 No.4
5-Hydroxymethyl-2-furfural (HMF) was prepared with high fructose corn syrup (HFCS) manufactured directly from industry. Equipped industrial process and cheaper availability considered HFCS-90 as a competitive starter for production of HMF. Readily evaporable solvent, 1,4-dioxane was found as a promising reaction media from the screening of various solvents and readily available cation exchange resin, Amberlyst-15 was used as a solid acid catalyst. Parametric variation studies including amount of catalyst, concentration of HFCS-90, and reaction temperature were performed to achieve a maximum HMF yield of 80% at 100<SUP>o</SUP>C within 3h. In particular, use of readily evaporable solvent and heterogeneous catalyst allowed highly practical purification of HMF, which still remains as a major obstacle to the commercialization of HMF. With filtration, evaporation, and extraction, HMF was simply isolated in 72% yield and <SUP>1</SUP>H NMR spectra of the isolated HMF confirmed that its purity was sufficient for use in next step of reactions. In addition, all solvents could be recycled with distillation and catalyst was reused up to 5 cycles without a significant loss of activity.
Jung, C.,Son, A.,Her, N.,Zoh, K.D.,Cho, J.,Yoon, Y. Korean Society of Industrial and Engineering Chemi 2015 Journal of industrial and engineering chemistry Vol.27 No.-
Endocrine-disrupting compounds (EDCs) and pharmaceuticals and personal care products (PPCPs) have been extensively detected in various surface water and wastewater. Carbon nanotubes (CNTs) have aroused great research attention as a new type of adsorbent due to their unique properties and potential applications for the removal of various inorganic and organic EDCs and PPCPs. This review summarizes the current research on the removal of EDCs and PPCPs with various CNTs, and provides valuable information for CNT applications in the water industry. The removal of various EDCs and PPCPs was reviewed based on the existing literature to address the effects of process parameters, including CNT properties, EDC/PPCP properties, and water chemistry conditions. Regulatory issues, analytical methods, and EDC/PPCP removal in water and wastewater treatment processes were also briefly addressed. Additionally, further research work on CNTs is suggested for the removal of EDCs and PPCPs from water.