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Lee, Seul Gi,Kim, Da Hyun,Lee, Young Seok,Cho, Seung-Yong,Chung, Myung-Sub,Cho, MinJa,Kang, YoungWoon,Kim, HyeJung,Kim, DongSul,Lee, Kwang-Won Elsevier 2018 Journal of food composition and analysis Vol.69 No.-
<P><B>Abstract</B></P> <P>Rice can be the major contributor to exposure of inorganic arsenic (iAs). A total of 485 domestic rice (polished rice, n = 368; husked rice, n = 117) samples produced in 2014 were determined for total arsenic (tAs) and As species. The determination of As species was conducted by HPLC-ICP-MS. AsIII was the major detected species. AsV, DMA, and MMA were occurred in lower level in both types of rice. In polished rice, iAs represented 43–91% of tAs: tAs = 0.088 ± 0.021 mg/kg; iAs = 0.060 ± 0.013 mg/kg. In husked rice, iAs ranged from 55% to 91% of tAs; tAs = 0.160 ± 0.042 mg/kg, iAs = 0.114 ± 0.029 mg/kg. The iAs level of polished rice samples was below the current maximum limit of the Chinese and German standard (0.2 mg/kg for inorganic arsenic in milled rice). Also, husked rice samples did not exceed the standard for iAs. Average dietary exposure to iAs from polished rice consumption was calculated as 0.17 ± 0.21 μg/kg·bw/day which was 8.09% level of Provisional Tolerable Weekly Intake. The result obtained in the present study provide a reference data of iAs in Korean rice for the establishment of safety standards.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Korean polished and husked rice were analyzed for total and inorganic arsenic. </LI> <LI> In rice AsIII was the major detected species, and iAs represents 43–91%. </LI> <LI> The level of iAs of polished rice was below the current maximum limit of standard. </LI> <LI> Safety standards depend on the As characteristic in rice and other foods. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Fluoroalkenylation of boronic acids <i>via</i> an oxidative Heck reaction
Lee, Da Seul,Cho, Eun Jin The Royal Society of Chemistry 2019 Organic & Biomolecular Chemistry Vol.17 No.17
<P>A fluoroalkenylation of boronic acids with fluoroalkyl alkenes has been developed. The Pd-catalyzed oxidative Heck coupling reaction proceeds under an oxygen atmosphere at room temperature, in the absence of a base and/or a ligand, showing excellent practicality of the process. This simple transformation is highly stereoselective to provide only <I>E</I>-isomers. In addition to the general approach using alkenes with functionalized fluoroalkyl reagents, this method, by transferring an aromatic system to the electron-deficient fluoroalkyl alkene, provides an efficient alternative method to yield valuable organofluorines.</P>
Da-Young Park,Yangkang So,Kyung-Jin Lee,Zhe Lu,Eun-Yi Oh,Kwang-Wok Min,Seul-Ki Lee,Jung-Hwan Lee,Mi-Hyun Ahn,Mira Song,Doo-Byoung Oh,Youngkwan Kim,Kisung Ko 한국당과학회 2009 한국당과학회 학술대회 Vol.2009 No.1
Plant genetic engineering has led to the production of plant-derived mAb (mAbP), which provides a safe and economically feasible alternative to the current antibody expression systems. In this study, the expression levels of mAbP SO57 with or without ER-signal peptides (Lys-Asp-Gly-Leu;KDEL) in transgenic tobacco plants were analysed in transgenic plant. PCR and Reverse Transcription-PCR analyses showed existence of heavy and light chain genes of mAb with or without KEDL and their transcription in plant, respectively. Western blot showed that the expression levels of mAbP SO57 with KDEL were significantly higher than that without KDEL. Flow cytometry analysis showed that the Fc domains of both purified mAbP and mammalian-derived mAb have similar binding activity to the FcγRI receptor. High-performance liquid chromatography analysis showed that the mAbP SO57 with KDEL had glycan profile with both oligomannose and golgi type, whereas the mAbP SO57 without KDEL had only golgi type glycans. Neutralizing analysis with rabies virus CVS-11 showed the similar neutralizing activity between mAbP SO57 with and without KDEL. These results suggest that the potential of mAbP SO57 for rabies immunotherapy is regardless of plant specific glycan structures.
Da-Seul Choi(최다슬),Ye-Chan Lee(이예찬),Oneeb ul Haq,Jae-Hwan Choi(최재환),Youn-Sik Lee(이연식) 한국고분자학회 2021 폴리머 Vol.45 No.4
본 연구에서는 4차 암모늄염기를 갖는 poly(ether ether ketone)(PEEK)와 술폰산기를 갖는 PEEK를 제조하고, 축전식 탈염(capacitive deionization, CDI) 셀에 필요한 탄소전극의 바인더로서 사용하였다. 이온교환 고분자 바인더를 사용하여 제조한 탄소전극으로 조립된 CDI 셀은(500 ppm NaCl 수용액의 투입 속도: 20 mL/min, 흡착과 탈착: 각각 1.0 V와 0.0 V), styrene-butadiene 바인더로 제조한 탄소전극에 비하여 크게 향상된 염 흡착 능(salt adsorption capacity, SAC)과 전하효율(charge efficiency, CE)을 나타냈다(SAC: 10.1 vs 6.8 ㎎/g, CE: 79.8 vs 37.7%). CDI 셀의 성능이 크게 향상된 주된 이유는 흡착단계에서 하전된 탄소전극에 이온들이 선택적으로 흡착하도록 하는 이온교환 고분자 바인더 때문인 것으로 이해된다. In order to develop polymer binder for use in the fabrication of activated carbon (AC) for capacitive deionization (CDI), we prepared quaternary ammonium group-bearing poly(ether ether ketone) (PEEK) and SO3H-bearing PEEK, and used them as binder in the preparation of AC electrodes. A CDI cell assembled using the electrodes (feed concentration: 500 ppm NaCl, flow rate: 20 mL/min, adsorption: 1.0 V, desorption: 0.0 V), exhibited greatly improved salt removal performance, compared to a cell assembled using the carbon electrodes fabricated from styrene-butadiene rubber as a binder (salt adsorption capacity: 10.1 vs 6.8 ㎎/g, charge efficiency: 79.8 vs 37.7%). The greatly improved cell performance was attributed to the ion-exchange binders that were well distributed throughout the AC electrodes, leading to selective ion adsorption onto the carbon electrodes during the adsorption steps.
Visible-Light-Promoted Synthesis of Fluoroalkylated Oximes
Lee, Da Seul,Hwang, Ho Seong,Cho, Eun Jin Wiley (John WileySons) 2018 Chemistry, an Asian journal Vol.13 No.17
<P>A method has been developed for the synthesis of fluoroalkylated oximes, potential fluoroalkyl building-blocks for the synthesis of various organofluorine compounds, from easily available amino substrates and fluoroalkylated alkenes. tBuONO was utilized both as a diazotizing agent and as a NO radical source for the oxime synthesis in the process, and the use of a photocatalyst under visible-light irradiation increased the efficiency of the reaction. Various fluoroalkylated oximes were prepared by a tandem process of aryl radical addition to fluoroalkylated alkene and consecutive oxime generation process, albeit in moderate yields. This differentiated approach, transferring an aromatic system into an electron-deficient fluoroalkylated alkene, expands the scope of substrates where electron-poor aromatic systems could be utilized.</P>
Synthesis of hollow carbon nanostructures as a non-precious catalyst for oxygen reduction reaction
Lee, Seul,Kwak, Da-Hee,Han, Sang-Beom,Hwang, Eui-Tak,Kim, Min-Cheol,Lee, Jin-Yeon,Lee, Young-Woo,Park, Kyung-Won Elsevier 2016 ELECTROCHIMICA ACTA Vol.191 No.-
<P><B>Abstract</B></P> <P>Carbon-based nanostructures as a non-precious catalyst for oxygen reduction reaction (ORR) exhibit excellent electrocatalytic activities due to high specific surface areas and favorable active sites supported by the doped transition metals and nitrogen species. We synthesize the metal-nitrogen doped carbon nanostructures (MPc-C, M=Fe,Co) by using a template method in the presence of metal phthalocyanine including FePc, CoPc, and FeCoPc as metal and nitrogen as well as carbon sources. The as-prepared carbon nanostructures show a high specific surface area, porous structure, and metal-nitrogen dopants, as observed by field-emission scanning electron microscopy (FE-SEM), field-emission transmission electron microscopy (FE-TEM), X-ray photo-electron spectroscopy (XPS), and nitrogen sorption measurement. Especially, among the doped carbon nanostructures, FeCoPc-C exhibits superior ORR electrocatalytic properties in an alkaline medium: an electron transfer number close to 4, high half-wave potential, improved electrochemical stability, and methanol tolerance.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We synthesized the metal-nitrogen doped carbon nanostructures using a facile method. </LI> <LI> The nanostructures consisted of a high specific surface area and porous structure. </LI> <LI> The nanostructures exhibited well-doped transition metal and nitrogen species. </LI> <LI> The nanostructures showed excellent electrocatalytic activities in ORR. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Jin-Yeon,Kwak, Da-Hee,Lee, Young-Woo,Lee, Seul,Park, Kyung-Won The Royal Society of Chemistry 2015 Physical chemistry chemical physics Vol.17 No.14
<P>The electrocatalytic properties for electro-oxidation reactions of shape-controlled Pt-based catalysts have been improved by alloying with 2nd elements. In this study, we demonstrate cubic PtPd alloy nanoparticles synthesized using a thermal decomposition method. The cubic PtPd nanoparticles exhibit a homogeneous distribution of alloy nanostructures in the presence of Pt and Pd metallic phases. The improved electrocatalytic activity for the electro-oxidation reactions of methanol and formic acid as chemical fuels might be attributed to the cubic alloy nanostructures. Furthermore, the cubic PtPd alloy nanoparticles as electrocatalysts exhibit excellent stability for electro-oxidation reactions.</P> <P>Graphic Abstract</P><P>Cubic PtPd alloy nanoparticles for improved methanol and formic acid oxidation reactions were synthesized using a thermal decomposition method. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5cp00892a'> </P>
Self-Position of Au NPs in Perovskite Solar Cells: Optical and Electrical Contribution
Lee, Da Seul,Kim, Wanjung,Cha, Bong Geun,Kwon, Jeong,Kim, Sung June,Kim, Min,Kim, Jaeyun,Wang, Dong Hwan,Park, Jong Hyeok American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.1
<P>Metallic nanoparticles (NPs) exhibit a localized surface plasmon resonance (LSPR) and act as scattering centers and subwavelength antennas, so metallic NPs can be incorporated into perovskite solar cells (PSCs) to effectively improve the light absorption of light harvesting devices. Here, we have embedded Au nanoparticles (NPs) into the hole transport layer (HTL) of the PSCs to investigate the photovoltaic effect of the PSCs with Au NPs. Interestingly, it was found that Au NPs dispersed spiro-OMeTAD HTL solution could naturally end up located near the perovskite layer as the result of the spin-coating step. Solar cell performance observations indicate that the LSPR and electrical effects of Au NPs enhance the photovoltaic response of PSCs, in spite of a slight decrease in the open-circuit voltage (V-OC), by causing an incredible improvement in the photocurrent density as a dominant factor.</P>