Facile isomerization of glucose into fructose using anion-exchange resins in organic solvents and application to direct conversion of glucose into furan compounds

Mun, D.,Huynh, N. T.,Shin, S.,Kim, Y. J.,Kim, S.,Shul, Y. G.,Cho, J. K. Springer Science + Business Media 2017 Research on chemical intermediates Vol.43 No.10

Synthesis and Characterization of Some Transition Metal Complexes of Unsymmetrical Tetradentate Schiff Base Ligand

Munde, A. S.,Jagdale, A. N.,Jadhav, S. M.,Chondhekar, T. K. Korean Chemical Society 2009 대한화학회지 Vol.53 No.4

o-phenylenediamine, 3-acetyl-6-methyl-(2H) pyran, 2,4 (3H)-dione (dehydroacetic acid or DHA) 및 살리실 알데히드로부터 유도한 4-hydroxy-3-(1-{2-(2-hydroxy-benzylidene)-amino phenylimino}-ethyl)-6- methy-pyran-2-one (H2L) 의 Cu(II), Ni(II), Co(II), Mn(II) 및 Fe(III) 고체 착물을 합성한 후, 원소분석, 전도 도법, 수자율, 자외선-가시선, 적외선, $^1H$-NMR 스펙트라, X-선 회절, 열분석을 통해 특성을 규명하고 항균 활성을 조사하였다. IR 스펙트럼 데이터로부터 이 리간드가 중심 금속이온에 대해 ONNO 주개원자 배열을 갖는 이염기성 네자리 리간드로 행동함을 제안하였다. 원소분석 데이터로부터 이들 착물의 화학량론이 1:1 (금속:리간드)임을 알았다. 물리-화학적 데이타로부터 Cu(II) 및 Ni(II) 착물이 사각평면 기 하구조, 그리고 Co(II), Mn(II) 및 Fe(III) 착물이 팔면체 기하구조임을 제안하였다. X-선 회절 데이터로 부터 Cu(II) 착물이 사방정계(orthorhombic) 결정계, Ni(II), Co(II) 및 Fe(III) 착물이 단사계(monoclinic) 결정계 그리고 Mn(II) 착물이 정방정계(tetragonal) 결정계임을 제안하였다. 착물의 열적 행동(TG/DTA) 을 연구하였으며 Coats-Redfern 방법으로 반응속도 파라메터를 결정하였다. 리간드와 이들 금속 착물을 이용하여 Staphylococcus aureus 및 Escherichia coli에 대한 향균 활성과 Aspergillus Niger 및 Trichoderma 에 대한 살균 활성을 조사하였다. The solid complexes of Cu(II), Ni(II), Co(II), Mn(II) and Fe(III) with 4-hydroxy-3-(1-{2-(2-hydroxybenzylidene)- amino phenylimino}-ethyl)-6-methy-pyran-2-one (H2L) derived from o-phenylenediamine, 3-acetyl- 6-methyl-(2H) pyran, 2,4 (3H)-dione (dehydroacetic acid or DHA) and salicylic aldehyde have been synthesized and characterized by elemental analysis, conductometry, magnetic susceptibility, UV-visible, IR, $^1H$-NMR spectra, X-ray diffraction, thermal analysis, and screened for antimicrobial activity. The IR spectral data suggest that the ligand behaves as a dibasic tetradentate ligand with ONNO donor atoms sequence towards central metal ion. From the microanalytical data, the stoichiometry of the complexes has been found to be 1:1 (metal: ligand). The physico-chemical data suggests square planar geometry for Cu(II) and Ni(II) complexes and octahedral geometry for Co(II), Mn(II) and Fe(III) complexes. The x-ray differaction data suggests orthorhombic crystal system for Cu(II) complex, monoclinic crystal system for Ni(II), Co(II) and Fe(III) and tetragonal crystal system for Mn(II) complex. Thermal behaviour (TG/DTA) of the complexes was studied and kinetic parameters were determined by Coats-Redfern method. The ligand and their metal complexes were screened for antibacterial activity against Staphylococcus aureus and Escherichia coli and fungicidal activity against Aspergillus Niger and Trichoderma.

Magnetic Compton Scattering Study of Ferromagnetic Ni₂MnSn

H.S. Mund,Alpa Dashora,K.R. Priolkar,M. Itou,Y. Sakurai,B.L. Ahuja 한국자기학회 2010 한국자기학회 학술연구발표회 논문개요집 Vol.2010 No.12

Synthesis, Potentiometric, Spectral Characterization and Microbial Studies of Transition Metal Complexes with Tridentate Ligand

Jadhav, S.M.,Munde, A.S.,Shankarwar, S.G.,Patharkar, V.R.,Shelke, V.A.,Chondhekar, T.K. Korean Chemical Society 2010 대한화학회지 Vol.54 No.5

o-phenylene diamines, dehydroacetic acid (DHA) 및 p-chloro benzaldehyde에서 유도된 세자리 Schiff 염기 리간드인 4-hydroxy-3(1-{2-(benzylideneamino)-phenylimino}-ethyl)-6-methyl-2H-pyran-2-one (HL)의 Cu(II), Ni(II), Co(II), Mn(II) 및 Fe(III) 착물의 형성상수와 항미생물 활성과의 관계를 연구하였다.리간드와 착물은 원소분석, 전도도, 자기수자율, 열분석, X-선 회절, IR, $^1H$-NMR, UV-vis 및 질량 스펙트럼으로 특성조사를 하였다. 분석데이터로부터 착물들의 화학량론비가 1:2 (금속:리간드)임을 알았다. 금속 착물들의 몰 전도도 값은 이들의 비전해질 성질을 의미한다. X-선 회절 데이터에서 Ni(II) 착물은 단사정계 그리고 Cu(II) 및 Co(II) 착물은 삼사정계 결정계임을 규명하였다. IR 스펙트럼 데이터로부터 리간드는 중심금속에 대해 ONN 주개원자 배열의 세자리 리간드로 행동함을 알았다. 열적 행동 (TG/DTA)과 Coats-Redfern 법에 의해 계산한 반응속도 파라메터는 착물형성 과정에서 좀 더 질서 있는 활성화 상태를 제안하고 있다. 착물의 양성자화 상수를 THF:물 (60:40) 용액, $25^{\circ}C$ 및 이온세기 ${\mu}=0.1\;M$ ($NaClO_4$)에서 전위차법으로 측정하였다. Staphylococcus aureu 및 Escherichia coli.에 대한 항박테리아 활성을 시험관에서 조사하였다. 또한 Aspergillus Niger 및 Trichoderma에 대한 항세균 활성도 조사하였다. 금속 이온 및 착물의 안정도가 항미생물학적 활성에 미치는 영향을 고찰하였다. A relation between antimicrobial activities and the formation constants of solid complexes of Cu(II), Ni(II), Co(II), Mn(II) and Fe(III) with tridentate Schiff base ligand, 4-hydroxy-3(1-{2-(benzylideneamino)-phenylimino}-ethyl)-6-methyl-2Hpyran-2-one (HL) derived from o-phenylene diamines, dehydroacetic acid (DHA) and p-chloro benzaldehyde have been studied. The ligand and metal complexes were characterized by elemental analysis, conductivity, magnetic susceptibility, thermal analysis, X-ray diffraction, IR, $^1H$-NMR, UV-vis and mass spectra. From the analytical data, the stiochiometry of the complexes was found to be 1:2 (metal:ligand) with octahedral geometry. The molar conductance values suggest the nonelectrolytic nature of metal complexes. The X-ray diffraction data suggests monoclinic crystal system for Ni(II) and orthorhombic crystal system for Cu(II) and Co(II) complexes. The IR spectral data suggest that the ligand behaves as tridentate ligand with ONN donor atoms sequence towards central metal ion. Thermal behavior (TG/DTA) and kinetic parameters calculated by Coats-Redfern method suggests more ordered activated state in complex formation. The protonation constants of the complexes were determined potentiometrically in THF:water (60:40) medium at $25^{\circ}C$ and ionic strength ${\mu}=0.1\;M$ ($NaClO_4$). Antibacterial activities in vitro were performed against Staphylococcus aureu and Escherichia coli. Antifungal activities were studied against Aspergillus Niger and Trichoderma. The effect of the metal ions and stabilities of complexes on antimicrobial activities are discussed.

Production, Structural Elucidation, and In Vitro Antitumor Activity of Trehalose Lipid Biosurfactant from Nocardia farcinica Strain

( Nelly Christova ),( Sieg Mund Lang ),( Victor Wray ),( Kaloyan Kaloyanov ),( Spiro Konstantinov ),( Ivanka Stoineva ) 한국미생물 · 생명공학회 2015 Journal of microbiology and biotechnology Vol.25 No.4

The objective of this study was to isolate and identify the chemical structure of a biosurfactant produced by Nocardia farcinica strain BN26 isolated from soil, and evaluate its in vitro antitumor activity on a panel of human cancer cell lines. Strain BN26 was found to produce glycolipid biosurfactant on n-hexadecane as the sole carbon source. The biosurfactant was purified using medium-pressure liquid chromatography and characterized as trehalose lipid tetraester (THL) by nuclear magnetic resonance spectroscopy and mass spectrometry. Subsequently, the cytotoxic effects of THL on cancer cell lines BV-173, KE-37 (SKW-3), HL-60, HL-60/DOX, and JMSU-1 were evaluated by MTT assay. It was shown that THL exerted concentration-dependent antiproliferative activity against the human tumor cell lines and mediated cell death by the induction of partial oligonucleosomal DNA fragmentation. These findings suggest that THL could be of potential to apply in biomedicine as a therapeutic agent.

Effect of Ni Doping on Magnetic Properties of LaFe<SUB>1-x</SUB>NixO₃ (x =0.4 and 0.5)

Alpa Dashora,Shailja Tiwari,H. S. Mund,R. J. Choudhary,D. M. Phase,M. Itou,Y. Sakuari,B. L. Ahuja 한국자기학회 2010 한국자기학회 학술연구발표회 논문개요집 Vol.2010 No.12

Giant Popliteal Artery Aneurysm in a Teenager: An Unusual Occurrence

Sanjeev Jadhav,Sachin Sanagar,Shantesh Kaushik,Haridas Munde 대한흉부외과학회 2019 Journal of Chest Surgery (J Chest Surg) Vol.52 No.2

Giant popliteal artery aneurysm is an uncommon entity. If untreated, it results in life-threatening complications. It is usually seen in older patients (over 60 years of age), and atherosclerotic disease is its main cause. Few cases have been reported in young adults, and its incidence in teenagers is exceptionally rare, with scarce case reports in the literature. We report a case of left popliteal artery aneurysm in a 16-yearold and its successful surgical treatment through resection and repair with a synthetic interposition graft.

Electrochemical determination of semicarbazide on cobalt oxide nanoparticles: Implication towards environmental monitoring

Balaji B. Mulik,Ajay V. Munde,Raviraj P. Dighole,Bhaskar R. Sathe 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.93 No.-

The electrochemical determination of semicarbazide (SCB) executed by using cobalt oxide (Co3O4)nanoparticle modified electrode which was fabricated by using simple precipitation method. The assynthesizednanoparticles have been well characterised by X-ray diffraction (XRD), Furrier transforminfra-red (FTIR), UV-visible (UV-Vis) spectroscopic techniques, energy dispersive analysis of X-ray(EDAX), BET surface area, thermogravimetric (TG) analysis and transmission electron microscopic (TEM)techniques. The XRD shows face centred cubic (FCC) structure, the FTIR demonstrated a major bandsappeared at 574 cm 1 and 669 cm 1 are suggesting the (Co-O) vibrational mode of Co3O4. The TEM ofCo3O4 NPs has been confirmed its ultra-small particle size is of2 nm 0.5 nm. Whereas, EDAX showsthe only cobalt and oxygen are available confirms Co3O4 having high BET surface area. The fabricatedCo3O4 acted as a highly sensitive electrochemical sensor for the determination of SCB by using linearSweep voltammetry (LSV), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) in0.5 M KOH solution. Significantly, anodic onset potential observed at 0.2 V vs. SCE, linear range of scanrate and concentration (1 mM–100 mM) with (LOD 0.13 and LOQ 0.46) and high current and potentialstability with pH dependent behaviour confirms Co3O4 based electrocatalytic system is good for oxidativedetermination of SCB. The selectivity of the sensor also tested by using mixture of other environmentalactive species with SCB by using LSV measurements. This proposed system is applicable in food andpharmaceutical industries for the determination of SCB as an amperometric sensor.

Defect Detection in Friction Stir Welding by Online Infrared Thermography

Kryukov, Igor,Hartmann, Michael,Bohm, Stefan,Mund, Malte,Dilger, Klaus,Fischer, Fabian The Korean Welding and Joining Society 2014 대한용접·접합학회지 Vol.32 No.5

Friction Stir Welding (FSW) is a complex process with several mutually interdependent parameters. A slight difference from known settings may lead to imperfections in the stirred zone. These inhomogeneities affect on the mechanical properties of the FSWed joints. In order to prevent the failure of the welded joint it is necessary to detect the most critical defects non-destructive. Especially critical defects are wormhole and lack of penetration (LOP), because of the difficulty of detection. Online thermography is used process-accompanying for defect detecting. A thermographic camera with a fixed position relating to the welding tool measures the heating-up and the cool down of the welding process. Lap joints with sound weld seam surfaces are manufactured and monitored. Different methods of evaluation of heat distribution and intensity profiles are introduced. It can be demonstrated, that it is possible to detect wormhole and lack of penetration as well as surface defects by analyzing the welding and the cooling process of friction stir welding by passive online thermography measurement. Effects of these defects on mechanical properties are shown by tensile testing.

Defect Detection in Friction Stir Welding by Online Infrared Thermography

Igor Kryukov,Michael Hartmann,Stefan Böhm,Malte Mund,Klaus Dilger,Fabian Fischer 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.5

Friction Stir Welding (FSW) is a complex process with several mutually interdependent parameters. A slight difference from known settings may lead to imperfections in the stirred zone. These inhomogeneities affect on the mechanical properties of the FSWed joints. In order to prevent the failure of the welded joint it is necessary to detect the most critical defects non-destructive. Especially critical defects are wormhole and lack of penetration (LOP), because of the difficulty of detection. Online thermography is used process-accompanying for defect detecting. A thermographic camera with a fixed position relating to the welding tool measures the heating-up and the cool down of the welding process. Lap joints with sound weld seam surfaces are manufactured and monitored. Different methods of evaluation of heat distribution and intensity profiles are introduced. It can be demonstrated, that it is possible to detect wormhole and lack of penetration as well as surface defects by analyzing the welding and the cooling process of friction stir welding by passive online thermography measurement. Effects of these defects on mechanical properties are shown by tensile testing.