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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.
Jayamani, Arumugam,Thamilarasan, Vijayan,Ganesan, Venketasan,Sengottuvelan, Nallathambi Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.12
A nickel(II) complex $[Ni(H_2biim)_2(H_2O)_2](ClO_4)_2{\cdot}H_2O$ (1) of biimidazole ligand has been synthesized and characterized (Where $H_2biim$ = 2,2'-biimidazole). The single crystal X-ray diffraction of the complex shows a dimeric structure with six coordinated psudo-octahedral geometry. The cyclic voltammograms of complex exhibited one quasireversible reduction wave ($E_{pc}=-0.61V$) and an irreversible oxidation wave ($E_{pa}=1.28V$) in DMF solution. The interaction of the complex with Calf-Thymus DNA (CT-DNA) has been investigated by absorption and fluorescence spectroscopy. The complex is an avid DNA binder with a binding constant value of $1.03{\times}10^5M^{-1}$. The results suggest that the nickel(II) complex bind to CT-DNA via intercalative mode and can quench the fluorescence intensity of EB bind to CT-DNA with $K_{app}$ value of $3.2{\times}10^5M^{-1}$. The complex also shown efficient oxidative cleavage of supercoiled pBR322 DNA in the presence of hydrogen peroxide as oxidizing agent. The DNA cleavage by complex in presence of quenchers; viz. DMSO, KI, $NaN_3$ and EDTA reveals that hydroxyl radical or singlet oxygen mechanism is involved. The complex showed invitro antimicrobial activity against four bacteria and two fungi. The antimicrobial activity was nearer to that of standard drugs and greater than that of the free ligand.
Arumugam Jayamani,Vijayan Thamilarasan,Venketasan Ganesan,Nallathambi Sengottuvelan 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.12
A nickel(II) complex [Ni(H2biim)2(H2O)2](ClO4)2·H2O (1) of biimidazole ligand has been synthesized and characterized (Where H2biim = 2,2'-biimidazole). The single crystal X-ray diffraction of the complex shows a dimeric structure with six coordinated psudo-octahedral geometry. The cyclic voltammograms of complex exhibited one quasireversible reduction wave (Epc = −0.61 V) and an irreversible oxidation wave (Epa = 1.28 V) in DMF solution. The interaction of the complex with Calf-Thymus DNA (CT-DNA) has been investigated by absorption and fluorescence spectroscopy. The complex is an avid DNA binder with a binding constant value of 1.03 × 105 M−1. The results suggest that the nickel(II) complex bind to CT-DNA via intercalative mode and can quench the fluorescence intensity of EB bind to CT-DNA with Kapp value of 3.2 × 105 M−1. The complex also shown efficient oxidative cleavage of supercoiled pBR322 DNA in the presence of hydrogen peroxide as oxidizing agent. The DNA cleavage by complex in presence of quenchers; viz. DMSO, KI, NaN3 and EDTA reveals that hydroxyl radical or singlet oxygen mechanism is involved. The complex showed invitro antimicrobial activity against four bacteria and two fungi. The antimicrobial activity was nearer to that of standard drugs and greater than that of the free ligand.
A near-infrared fluorescent probe for amyloid-β aggregates
Lee, Misun,Kim, Mingeun,Tikum, Anjong Florence,Lee, Hyuck Jin,Thamilarasan, Vijayan,Lim, Mi Hee,Kim, Jinheung Elsevier 2019 Dyes and pigments Vol.162 No.-
<P><B>Abstract</B></P> <P>The deposition of amyloid-β (Aβ) aggregates in the brain is a hallmark of the Alzheimer's disease (AD)-affected brain. Various aggregated Aβ species, including oligomers and fibrils, are generated upon the aggregation process, and these Aβ aggregates have distinct biological properties. To non-invasively monitor the aggregation pathways of Aβ and identify the existence of certain Aβ species in biological environments, an effective strategy to detect Aβ species is necessary. Herein, we report a turn-on near-infrared (near-IR) fluorescent probe, <B>1</B>, for Aβ aggregates, which consists of a donor-π-acceptor system with an Aβ-interacting moiety. Our probe, <B>1</B>, shows a noticeable increase in near-IR fluorescence at <I>ca.</I> 710 nm in the presence of Aβ aggregates in aqueous media. In addition, the fluorescent response of <B>1</B> was altered depending on the degree of Aβ aggregation. Moreover, <B>1</B> indicates turn-on fluorescence with Aβ aggregates in living cells and is nontoxic under the condition used for live-cell imaging.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A near-IR fluorescent probe for detecting Aβ species was developed. </LI> <LI> <B>1</B> monitors Aβ aggregation with a change in fluorescence in aqueous media. </LI> <LI> <B>1</B> shows turn-on fluorescence with Aβ species in living cells. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>