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Sherly Arputha Kiruba V.,Karunya University | Dakshinamurthy A.,Karunya University | Subramanian P.S.,Discipline of Inorganic Materials and Catalysis | Mosae Selvakumar P.,Karunya University
Journal of Experimental Nanoscience | Year: 2015

We report for the first time the green synthesis of silver nanoparticles using West Indian cherry (Malpighia emarginata) extract known for its high vitamin C content. UV–visible spectroscopy, powder X ray diffraction (PXRD), dynamic light scattering (DLS), scanning electron microscopy (SEM) and energy dispersive X ray spectroscopy (EDX) analysis were used to characterise silver nanoparticles. Silver nanoparticles thus synthesised exhibit antimicrobial activity against gram-negative bacteria such as Pseudomonas aeruginosa, Escherichia coli, and gram-positive bacteria such as Bacillus subtilis and Staphylococcus aureus. The antimicrobial property of nanoparticles thus synthesised was applied in the production of silver-activated charcoal nanocomposite towards fabrication of antimicrobial water filtration columns. The microbial filtration efficiency of the nanocomposite was found to be higher compared to virgin activated charcoal even with reusage. © 2015, © 2013 Taylor & Francis.

Nadella S.,Discipline of Inorganic Materials and Catalysis | Sahoo J.,Discipline of Inorganic Materials and Catalysis | Subramanian P.S.,Discipline of Inorganic Materials and Catalysis | Sahu A.,Discipline of Inorganic Materials and Catalysis | And 2 more authors.
Chemistry (Weinheim an der Bergstrasse, Germany) | Year: 2014

Phenanthroline-based chiral ligands L(1) and L(2) as well as the corresponding Eu(III) and Tb(III) complexes were synthesized and characterized. The coordination compounds show red and green emission, which was explored for the sensing of a series of anions such as F(-), Cl(-), Br(-), I(-), NO3(-), NO2(-), HPO4(2-), HSO4(-), CH3COO(-), and HCO3(-). Among the anions, HPO4(2-) exhibited a strong response in the emission property of both europium(III) and terbium(III) complexes. The complexes showed interactions with the nucleoside phosphates adenosine triphosphate (ATP), adenosine diphosphate (ADP), and adenosine monophosphate (AMP). Owing to this recognition, these complexes have been applied as staining agents in the microalgal cell Chlorella vulgaris. The stained microalgal cells were monitored through fluorescence microscopy and scanning electron microscopy. Initially, the complexes bind to the outer cell wall and then enter the cell wall through holes in which they probably bind to phospholipids. This leads to a quenching of the luminescence properties. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Nazish M.,Discipline of Inorganic Materials and Catalysis | Nazish M.,Indian Central Salt and Marine Chemicals Research Institute | Jakhar A.,Discipline of Inorganic Materials and Catalysis | Jakhar A.,Indian Central Salt and Marine Chemicals Research Institute | And 10 more authors.
Applied Catalysis A: General | Year: 2016

Ti-salen complexes were generated by using a series of chiral macrocyclic salen ligands and were used as catalysts for enantioselective hydrophosphonylation (EHP) reaction of benzylimines, isatin derived ketimines and isatins. The corresponding phosphonylated products were obtained with excellent yield (up to 92%) and enantioselectivity (ee up to 99%) with low catalyst loading at room temperature using dimethyl phosphite as nucleophile (IIa) for isatins and benzylimines, whereas for ketimines diphenyl phosphite (IIb) gave best results with very good yield (up to 88%) and ee (up to 99%). The Ti(IV) complex was recoverable and recyclable with retention of its catalytic performance at gram scale level. To understand the reaction mechanism NMR studies have been carried out using benzylimine as a model substrate and dimethyl phosphite as a nucleophile. © 2016 Elsevier B.V. All rights reserved.

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