飼料 중 아연 給源이 가금의 면역스트레스에 미치는 영향

高泰松 건국대학교 1995 學術誌 Vol.39 No.2

The influences of dietary 35 ppm of zinc (Zn) in oxide (ZnO) and sulfate (ZnSO4) and Zn-proteinate chelate (complex) forms on immune responses in chicks challenged with Salmonella typhymurium lipopolysaccaride (LPS) was compared with those in saline-injected. Immunogen - injected birds resulted in significantly (p<0.05) lower rates in daily gain and diet consumption. Feed efficiency were similar in ZnO and ZnSO4 diets and lowered significantly (p<0.0001) in complex and Zn-deficiency diets. Immulogic stress did not affect plasma zinc levels, but which was increaseed significantly (p<0.05) in bird fed ZnO, Zn levels of liver cytosol were increased significantly in ZnO and ZnSO4, decreased in Zn-deficiency and not shown any significant difference in Complex diet. And erythrocyte cytosol had higher Zn levels in ZnO, ZnSO4 and Complex and similar value in Zn-free diets. Metalothionein (MT) levels in liver cytosol of immunized birds was not influenceed in ZnO, increased in ZnSO4 and decreased in Complex and Zn-free diets. In erythrocyte cytosol of immunized birds gave higher MT levels in ZnO, ZnSO4 and Zn-free diets and similar values in Complex diet. In liver cytosol activity of Cu/ZnSOD was similar in ZnO, higher in ZnSO4 and lower in Complex and Zn-free diets. Immunization increased activity of MnSOD in ZnO, ZnSO4 and Zn-free diets while showed similar values in Complex diet. In erythrocyte cytosol, ZnO, ZnSO4 and Compex diets increased activity of Cu/ZnSOD while Zn-free diet gave similar value. Immunologic stress did not change MnSOD activity significantly while Complex diet increased MnSOD activity compared with those fed ZnO and ZnSO4 diets. The results indicated that immunologic responses were different among birds fed different dietary zinc sources. Key word : Immunologic Stress, Zinc Oxide, Zinc Sulfate, Zn-Protein Complex, Metallothionein, Cu/ZnSOD, MnSOD, Broiler

Investigating time-dependent Zn species over Zn-based catalysts in glycerol carbonylation with urea and their roles in the reaction mechanism

Nguyen-Phu, Huy,Shin, Eun Woo Elsevier 2018 Applied Catalysis A Vol.561 No.-

<P><B>Abstract</B></P> <P>In this work, two different Zn-based catalysts – ZnO, and ZnAl mixed oxide (ZnAlO) – were employed to investigate Zn-phase-dependent catalysis in glycerol carbonylation with urea as a function of reaction times. ZnAlO catalyst exhibited higher selectivity and yield of glycerol carbonate (GC) over a wide range of glycerol conversion than the ZnO catalyst. The time-dependent Zn species and reaction intermediates were observed in the solid and liquid phases at various reaction times through FTIR and XRD measurements in order to understand Zn-containing intermediates and corresponding reaction routes over each catalyst. The low GC selectivity in the reaction over the ZnO catalyst was closely connected to the formation of zinc glycerolate (ZnGly) in the solid phase. For the ZnO catalyst, ZnGly was formed in the solid phase even at an initial reaction time by the reaction between Zn NCO complex and glycerol, resulting in the loss of GC selectivity. Alternatively, over a ZnAlO catalyst, the formation of the Zn isocyanate (NCO) complex was dominant up to 2 h of reaction time in both the liquid and solid phases. After 2 h of reaction time, ZnGly was observed in the spent ZnAlO catalyst along with decreasing GC selectivity. The relative formation rates of Zn-containing reaction intermediates (ZnGly and Zn NCO complex) over the ZnAlO catalyst were affected by the Zn phases over the solid catalysts and the ratio of urea to glycerol in the liquid phase during the reaction time.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Reaction-time dependent Zn species over ZnO and ZnAlO catalysts was observed in glycerol carbonylation with urea. </LI> <LI> The role of these Zn species (zinc glycerolate (ZnGly) and Zn NCO complex) in the reaction routes was suggested. </LI> <LI> For ZnO catalyst, ZnGly was formed at initial time from Zn NCO complex and glycerol, resulting in low GC selectivity (52–56%). </LI> <LI> Over ZnAlO catalyst, ZnGly was produced after t = 2 h via the Zn NCO complex, decreasing GC selectivity from 92% to 78%. </LI> <LI> ZnAlO catalyst exhibited higher selectivity and yield of GC over a wide range of glycerol conversion than ZnO catalyst. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Zn(HPB)₂와 Zn(HPQ)₂를 이용한 White OLED의 제작 및 전기적 특성

김동은(Dong-Eun Kim),김병상(Byoung-Sang Kim),김경철(Gyong-Chol Kim),신훈규(Hoon-Kyu Shin),권영수(Young-Soo Kwon) 대한전기학회 2010 전기학회논문지 Vol.59 No.12

We have studied white OLED using two types of Zn-complexes as a emitting layer. We synthesized new emissive materials Zn(HPQ)₂ as a yellow emitting material and Zn(HPB)2 as a blue emitting material. Zn-complexes have a low molecular compound and thermal stability. The fundamental structures of the fabricated OLED was ITO / NPB (40㎚) / Zn(HPB)₂ (30㎚) / Zn(HPQ)₂ / LiF / Al. We varied the thickness of the Zn(HPQ)₂ layer 20, 30 40 ㎚. When the thickness of the Zn(HPQ)₂ layer was 20 ㎚, white emission was achieved. The maximum luminance was 12,000 ㏅/㎡ at a current density of 800 ㎃/㎠. The CIE coordinates of the white emission was (0.319. 0.338) at an applied voltage of 10 V.

Energy Band Structure and Photocatalytic Property of Fe-doped Zn₂TiO₄ Material

Jang, Jum-Suk,Borse, Pramod H.,Lee, Jae-Sung,Lim, Kwon-Taek,Jung, Ok-Sang,Jeong, Euh-Duck,Bae, Jong-Seong,Won, Mi-Sook,Kim, Hyun-Gyu Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.12

$Zn_2Ti_{1-x}Fe_xO_4\;(0\;{\leq}\;x\;{\leq}\;0.7)$ photocatalysts were synthesized by polymerized complex (PC) method and investigated for its physico-chemical as well as optical properties. $Zn_2Ti_{1-x}Fe_xO_4$ can absorb not only UV light but also visible light region due to doping of Fe in the Ti site of $Zn_2TiO_4$ lattice because of the band transition from Fe 3d to the Fe 3d + Ti3d hybrid orbital. The photocatalytic activity of Fe doped $Zn_2TiO_4$ samples for hydrogen production under UV light irradiation decreased with an increase in Fe concentration in $Zn_2TiO_4$. Consequently, there exists an optimized concentration of iron for improved photocatalytic activity under visible light (${\lambda}{\leq}$420 nm)

Energy Band Structure and Photocatalytic Property of Fe-doped Zn2TiO4 Material

장점석,Pramod H. Borse,이재성,임권택,정옥상,정의덕,Jong Seong Bae,원미숙,김현규 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.12

Zn2Ti1-xFexO4 (0 ≤ x ≤ 0.7) photocatalysts were synthesized by polymerized complex (PC) method and investigated for its physico-chemical as well as optical properties. Zn2Ti1-xFexO4 can absorb not only UV light but also visible light region due to doping of Fe in the Ti site of Zn2TiO4 lattice because of the band transition from Fe 3d to the Fe 3d + Ti3d hybrid orbital. The photocatalytic activity of Fe doped Zn2TiO4 samples for hydrogen product ion under UV light irradiation decreased with an increase in Fe concentration in Zn2TiO4. Consequently, there exists an optimized concentration of iron for improved photocatalytic activity under visible light (λ ≥ 420 nm)

Crystal structures and catalytic activities of Zn(II) compounds containing 1,3-bis(4-pyridyl)propane

Kim, Youngmee,Kim, Sung-Jin,Choi, Seung Hoon,Han, Jung Hee,Nam, Sang Ho,Lee, Jung Hwan,Kim, Hee Jin,Kim, Cheal,Kim, Dong Wook,Jang, Ho Gyeom Elsevier Sequoia [etc.] 2006 Inorganica chimica acta Vol.359 No.8

<P><B>Graphical abstract</B></P><P>The structures of new compounds containing Zn(II) ions and bpp ligands have been determined. The polymeric compounds <B>1</B> and <B>2</B> containing hydroxyl-bridged zinc cations [Zn<SUB>2</SUB>OH] were found to carry out the catalytic transesterification of a range of esters with methanol at room temperature under the mild conditions.</P><ce:figure></ce:figure> <P><B>Abstract</B></P><P>The structures of new compounds containing Zn(II) ions and bpp (1,3-bis(4-pyridyl)propane) ligands have been determined. The coordinating halides (Br<SUP>−</SUP> or Cl<SUP>−</SUP>) produce one-dimensional compounds <B>6</B> and <B>7</B>, and intra- and inter-chain CH⋯X (X=Br or I) interactions play roles for building crystal structures with the flexible bpp ligands. The non-coordinating PF6− anions do not produce hydroxyl bridged zinc cations or polymeric compounds, and produce only a monomeric complex <B>4</B> containing four bpp ligands and two water ligands. Previously reported polymeric compounds <B>1</B> and <B>2</B> containing hydroxyl-bridged zinc cations [Zn<SUB>2</SUB>OH] were found to carry out the catalytic transesterification of a range of esters with methanol at room temperature under the mild conditions, whereas the rest of compounds did not catalyze the transesterification reactions at all. In addition, the catalysts <B>1</B> and <B>2</B> have shown even better catalytic activity than zinc salts Zn(NO<SUB>3</SUB>)<SUB>2</SUB> and Zn(OTf)<SUB>2</SUB>.</P>

Zn(HPB)q를 전자수송층으로 이용한 OLED의 전기․광학적 특성 연구

김동은(Dong-Eun Kim),박준우(Jun-Woo Park),김병상(Byoung-Sang Kim),이범종(Burm-Jong Lee),권영수(Young-Soo Kwon) 대한전기학회 2010 전기학회논문지 Vol.59 No.5

Recently, high luminance and high efficiency were realized in OLED with multilayer structure including emitting materials such as metal-chelate complexes. We synthesized a new luminescent material, namely, [2-(2-hydroxyphenyl)quinoline] (Zn(HPB)q) which has low molecular compound and emitted in yellowish green region. The ionization potential(IP) and electron affinity(EA) of Zn(HPB)q were measured by cyclic-voltammetry(CV). As a result, IP and EA of Zn(HPB)q were calculated 6.8 eV and 3.5 eV, respectively. We fabricated the devices and observed the possibility of Zn(HPB)q as electron transporting layer. We have obtained an improvement of luminance and decrease of turn-on voltage using Zn(HPB)q as electron transporting layer.

Selective Detection of 2,4,6-Trinitrophenol Based on In Situ-generated Fluorescent Zn2+–Anthracene Ensembles in 80% Aqueous Dimethyl Sulfoxide

Anup Pandith,김홍석 대한화학회 2018 Bulletin of the Korean Chemical Society Vol.39 No.1

Novel in situ-generated highly fluorescent chelated Zn2+–anthracene (Zn2+•P: 1:1) complex detected 2,4,6-trinitrophenol (TNP) more selectively by a “switch-off” response with a very high Stern–Volmer quenching constant (Ksv = 3.75 × 106 M−1) at a 1:2 stoichiometry in 80% aqueous DMSO. The selective quenching response that occurred with TNP is due to the effective destruction of the chelated complex by efficient protonation at secondary amines, which created an effective resonance energy transfer (RET) from the anthracene unit to the TNP. Formation of a stable P2+•(TNP)−2 ionic charge-transfer complex showed that the anthracene monomer band quenching resulted from efficient RET, accompanied by synergistic multiple hydrogen bonding, electron-rich–electron-deficient πAn–πTNP interactions, and columbic interactions. An application was demonstrated using the biocompatible ensemble-coated hydrogel for ultraviolet-assisted naked eye sensing, and its sensing mechanism was postulated. The lowest detection limit for TNP was 3.01 × 10−10 M in 80% aqueous DMSO.

Effects of Feeding Different Chelated Copper and Zinc Sources on Growth Performance and Fecal Excretions of Weanling Pigs

Lee, S.H.,Choi, S.C.,Chae, B.J.,Acda, S.P.,Han, Y.K. Asian Australasian Association of Animal Productio 2001 Animal Bioscience Vol.14 No.11

Two feeding trials were conducted to study the effects of different chelated copper and zinc compounds on the performance and fecal excretions of weanling pigs. In Exp. 1, 150 weanling pigs ($L{\times}Y{\times}D$, $12.30{\pm}2.07kg$) were randomly assigned to five dietary treatments: 170 ppm Cu from $CuSO_4$, 85 ppm Cu from Cu amino-chelate (CAC), 170 ppm Cu from CAC, 85 ppm Cu from Cu-Lysine (CL), and 170 ppm Cu from CL. In Exp. 2, 150 weanling pigs ($L{\times}Y{\times}D$, $12.52{\pm}1.80kg$) were randomly assigned to five dietary treatments: 120 ppm Zn from $ZnSO_4$, 60 ppm Zn from Zn-amino-chelate (ZAC), 120 ppm Zn from ZAC, 60 ppm Zn from Zn-Methionine (ZM), and 120 ppm Zn from ZM. In both experiments, pigs were randomly distributed to the treatments following a randomized complete block design on the basis of body weight as the blocking variable. Each experiment was conducted for 28 days. Blood and fecal samples were collected to determine mineral contents as affected by the dietary treatments. There was no difference (p>0.05) in ADG and ADFI among treatments, but F/G was improved (p<0.05) in pigs fed diet with 170 ppm CAC than 85 ppm CL but not different (p>0.05) to the control (170 ppm $CuSO_4$). Regardless of copper source, concentration of Cu in serum and feces were higher in pigs fed diet with 170 ppm Cu than pigs fed diet with 85 ppm Cu (Exp 1). In Exp 2 the ADG was higher (p<0.05) in pigs fed diet with 120 ppm ZM than in pigs fed diets with 120 ppm $ZnSO_4$ and 60 ppm ZAC and ZM. The serum zinc concentration was generally higher (p<0.05) in pigs fed diet with organic source than the control group ($ZnSO_4$). Also, there was a trend towards a decrease in fecal excretions of zinc when dietary zinc level was low. The efficacy of the two chelated copper and zinc sources is similar in terms of growth performance. The fecal excretions for Cu and Zn could be reduced in pigs fed low level of these minerals using organic sources.

Mixed ligand octahedral Zn(II) complex of N^N^O donor tridentate Schiff base ligand and N^N donor bidentate bipyridine ligand: Synthesis, characterization, biological activity and cytotoxicity

Thamilarasan Vijayan,Arumugam Jayamani,Mani Pugazhenthi,Azam Nasirian,Jinheung Kim,Gopinath Kasi 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.11

Tridentate NNO donor Schiff base ligand and its mixed ligand zinc(II) complexwere synthesized stoichiometrically and characterized by electronic, infrared,mass spectral techniques and elemental analysis. To understand the DNA bindingability, the complex was investigated by various analytical and spectroscopictechniques in presence of calf thymus DNA (CT-DNA). The bindingstudies showed that the zinc complex interacts with DNA by groove bindingmode with intrinsic binding strength of 2.11 105 M1 and with bovine serumalbumin the complex showed dynamic quenching attributed for changes inthe secondary structure of BSA with efficient interaction. The MCF-7 cell linestudies of the zinc(II) complex with 90.8 μM IC50 value revealed that the complexis effective for the breast cancer cell line and has a potential as anticancerdrug. Furthermore, the tridentate ligand and its mixed ligand zinc complexwere screened for antibacterial and antifungal activities, which showed betterantimicrobial activity for complex.