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Otari, Sachin V.,Shinde, Vijay V.,Hui, Gao,Patel, Sanjay K.S.,Kalia, Vipin C.,Kim, In-Won,Lee, Jung-Kul Elsevier 2019 CERAMICS INTERNATIONAL Vol.45 No.5
<P><B>Abstract</B></P> <P>Noble-metal hybrid nanostructures have gained tremendous attention due to their potential roles in biomedical and catalytic applications. In this study, for the synthesis of silver nanoparticles (Ag NPs)–silica (SiO<SUB>2</SUB>) NPs, a novel green chemistry approach was employed, in which green tea biomolecule–encapsulated SiO<SUB>2</SUB> nanostructures were used for the reduction of silver ions to produce hybrid nanostructures within 300 s. The high-resolution transmission electron microscopy (HrTEM) revealed the formation of uniform ultrafine spherical Ag NPs that were evenly distributed in the nanostructures. The formed nanohybrid structures showed efficient catalytic activity for the formation of derivatives of dihydroquinoline, and retained 91% of their reusability capacity, even after 5 repeated cycles. Hence, this work provides a novel synthesis method not only for the synthesis of biomolecule-entrapped SiO<SUB>2</SUB> nanostructures, but also for the rapid formation of catalytically active hybrid nanostructures.</P>
Otari, Sachin V.,Kumar, M.,Kim, In-Won,Lee, Jai Hyo,Lee, Jung-Kul Elsevier 2017 Materials letters Vol.188 No.-
<P><B>Abstract</B></P> <P>In this study, peptide-mediated synthesis of gold nanoparticles (Ni-GNPs) was conducted via a rapid biological protocol using the thermostable antimicrobial peptide nisin. Gold ions in the reaction mixture were mixed with nisin peptides and autoclaved to form colloidal Ni-GNPs. Characterization analysis revealed that the UV–vis spectra of the GNPs showed a peak at 530nm. X-ray diffraction and X-ray photoelectron spectroscopy of the Ni-GNPs confirmed their crystalline nature. Scanning electron images of the Ni-GNPs showed that they were spherical in shape and were uniform in size. Transmission electron microscopy analysis revealed the presence of peptides on the surface of spherical GNPs. The attachment of GNPs to the particles was demonstrated using circular dichroism. Ni-GNPs showed the presence of intact antimicrobial peptides on the surface of nanoparticles. The obtained Ni-GNPs were embedded as a charge storage medium in an insulator and ZnO semiconductor interface based on sol-gel-derived solution of processed thin film transistors. The fabricated device clearly exhibited hysteresis characteristics, suggesting that charge trapping occurred via the GNPs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Rapid synthesis of peptide coated nanoparticle is reported in this study. </LI> <LI> It is first report on thermostable nisin peptide mediated synthesis of gold nanoparticles. </LI> <LI> Nisin peptide showed antimicrobial activity after hydrothermal synthesis of nanoparticles. </LI> <LI> Formed gold nanoparticles showed enhancement in the TFT transfer characteristics. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Otari, Kishor Vasant,Shete, Rajkumar Virbhadrappa,Bhutada, Rupesh Nandkumar,Upasani, Chandrashekhar Devidas 경희한의학연구센터 2011 Oriental Pharmacy and Experimental Medicine Vol.11 No.3
The present work was aimed to assess the effect of ammonium glycyrrhizinate, $AG$ (50, 100, and 150 mg/kg, i.p.) on haloperidol induced catalepsy in mice; reserpine induced orofacial dyskinesia in rats; and reserpine antagonism in mice. Additionally the effect of $AG$ on lipid peroxidation (LP) in cataleptic mice brain and monoamine oxidase-B (MAO-B) levels in normal mice brain was assessed. Administration of $AG$ 100 and 150 mg/kg showed significant reduction in the duration of cataleptic behavior at 60 to 180 min and dose dependent decrease in LP induced by haloperidol. $AG$ showed significant decrease in frequency of vacuous chewing movements at 150 mg/kg and frequency of tongue protrusion at 100 and 150 mg/kg in reserpine induced orofacial dyskinesia test. $AG$ showed significant increase in frequency of horizontal movement and rearing behavior at 150 mg/kg and increase in grooming behavior at 100 and 150 mg/kg in reserpine antagonism test. $AG$ showed dose dependent inhibition of MAO-B in the normal mice brain. These results suggested that $AG$ prevented the haloperidol- and reserpine- induced neurobehavioral alterations possibly by acting as free radical scavenger or inhibiting MAO-B thereby increasing dopaminergic transmition consequently decreasing dopamine metabolites and ultimately preventing the generation of free radicals.
( S. V. Otari ),( S. H. Pawar ),( Sanjay K. S. Patel ),( Raushan K. Singh ),( Sang-yong Kim ),( Jai Hyo Lee ),( Liaoyuan Zhang ),( Jung-kul Lee ) 한국미생물 · 생명공학회 2017 Journal of microbiology and biotechnology Vol.27 No.4
A novel approach to synthesize silver nanoparticles (AgNPs) using leaf extract of Canna edulis Ker-Gawl. (CELE) under ambient conditions is reported here. The as-prepared AgNPs were analyzed by UV-visible spectroscopy, transmission emission microscopy, X-ray diffraction, Fourier transform-infrared spectroscopy, energy-dispersive analysis of X-ray spectroscopy, zeta potential, and dynamic light scattering. The AgNPs showed excellent antimicrobial activity against various pathogens, including bacteria and various fungi. The biocompatibility of the AgNPs was analyzed in the L929 cell line using NRU and MTT assays. Acridine orange/ ethidium bromide staining was used to determine whether the AgNPs had necrotic or apoptotic effects on L929 cells. The concentration of AgNPs required for 50% inhibition of growth of mammalian cells is far more than that required for inhibition of pathogenic microorganisms. Thus, CELE is a candidate for the eco-friendly, clean, cost-effective, and nontoxic synthesis of AgNPs.
Kishor Vasant Otari,Rajkumar Virbhadrappa Shete,Rupesh Nandkumar Bhutada,Chandrashekhar Devidas Upasani 경희대학교 융합한의과학연구소 2011 Oriental Pharmacy and Experimental Medicine Vol.11 No.3
The present work was aimed to assess the effect of ammonium glycyrrhizinate, AG (50, 100, and 150 mg/kg,i.p.) on haloperidol induced catalepsy in mice; reserpine induced orofacial dyskinesia in rats; and reserpine antagonism in mice. Additionally the effect of AG on lipid peroxidation (LP) in cataleptic mice brain and monoamine oxidase-B (MAO-B) levels in normal mice brain was assessed. Administration of AG 100 and 150 mg/kg showed significant reduction in the duration of cataleptic behavior at 60 to 180 min and dose dependent decrease in LP induced by haloperidol. AG showed significant decrease in frequency of vacuous chewing movements at 150 mg/kg and frequency of tongue protrusion at 100 and 150 mg/kg in reserpine induced orofacial dyskinesia test. AG showed significant increase in frequency of horizontal movement and rearing behavior at 150 mg/kg and increase in grooming behavior at 100 and 150 mg/kg in reserpine antagonism test. AG showed dose dependent inhibition of MAO-B in the normal mice brain. These results suggested that AG prevented the haloperidol- and reserpine- induced neurobehavioral alterations possibly by acting as free radical scavenger or inhibiting MAO-B thereby increasing dopaminergic transmition consequently decreasing dopamine metabolites and ultimately preventing the generation of free radicals.
Patel, Sanjay K.S.,Otari, Sachin V.,Li, Jinglin,Kim, Dong Rip,Kim, Sun Chang,Cho, Byung-Kwan,Kalia, Vipin C.,Kang, Yun Chan,Lee, Jung-Kul Elsevier 2018 Journal of hazardous materials Vol.347 No.-
<P><B>Abstract</B></P> <P>Herein, we report the preparation of a cross-linked protein-metal hybrid nanoflower (NF) system for laccase immobilization. The immobilized laccase showed effective encapsulation yield and activity recovery of 78.1% and 204%, respectively. The catalytic efficiency (<I>k</I> <SUB>cat</SUB> <I>V</I> <SUB>max</SUB> <SUP>−1</SUP>) of cross-linked NF (CL-NF) was 2.2-fold more than that of free laccase. The CL-NF also exhibited significantly higher stability towards pH and temperature changes. It exhibited excellent storage stability and tolerance towards solvents and inhibitors as compared with the free enzyme. After 10 cycles of reuses, the NF and CL-NF laccase showed 41.2% and 92.3% residual activity, respectively. The CL-NF showed high oxidation potential, 265% that of the free enzyme, towards phenolic compounds. The CL-NF laccase retained the residual decolorization efficiency of up to 84.6% for synthetic dyes under repeated batch conditions of 10 cycles. These results suggested that the preparation of CL-NF is an effective approach to enhance the enzymatic properties and has great potential in many industrial applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cross-linked (CL) laccase-metal hybrid nanoflower (NF) was prepared. </LI> <LI> The catalytic efficiency of CL-NF laccase was 2.2-fold higher than that of free laccase. </LI> <LI> CL-NF laccase showed 2.6-fold higher oxidation potential than free laccase towards phenolic compounds. </LI> <LI> Under repeated batch conditions, it retained high decolorization efficiency for synthetic dyes. </LI> </UL> </P>