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2017
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Journal Article
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Dr. S. Giridhar Reddy and Dr. Amrita Thakur, “Biogenic Synthesis Of Silver Nanoparticles Using Plant Waste Material”, Rasayan Journal of Chemistry, vol. 10, no. 2, 2017.
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2017
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Journal Article
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Dr. Amrita Thakur, “Study of ambient air quality trends and analysis of contributing factors in Bangalore, India”, Oriental Journal of Chemistry, vol. 33, pp. 1051-1056, 2017.[Abstract]
Presence of certain substances in air adversely affects human health, environment and climate. These chemicals are mainly added due to human activities. Maintaining air quality requires regular monitoring, identification of source of pollution and adoption of preventive measure. Bangalore a city in India has grown in size and population recently due to growth of IT industry. This rapid growth and related civic activity has affected its ecological services. The objective of this study is to identify air pollution trend in Bangalore and investigate the factors contributing towards it. Data for analysis has been obtained from state pollution control board website and has been used without any modification. Three criteria pollutants measured regularly and for longest period of time, sulphur dioxide (SO2), nitrogen dioxide (NO2) and respirable particulate matter (PM10) have been investigated for air quality analysis. © 2017, Oriental Scientific Publishing Company. All rights reserved.
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2016
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Journal Article
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Dr. S. Giridhar Reddy, Dr. Akanksha Saxena Pandit, and Dr. Amrita Thakur, “Effects of crosslink agents on sodium alginate and lignosulphonic acid blends”, Polymer (Korea), vol. 40, pp. 63-69, 2016.[Abstract]
Blends of sodium alginate (SA) and lignosulphonic acid (LS) has been prepared in the ratio of 80/20. The prepared blends were crosslinked using chlorides of calcium, barium, strontium and aluminum. The crosslinking of blends was done for different time intervals and then these blends were subjected for swelling studies in aqueous medium of pH 7.4. The observations indicate that the crosslinking is diffusion controlled and is affected by the size of metal ion and the type of alginate used. The improved swelling time for crosslinked blends in aqueous medium supports the fact that the stability under physiological conditions of the blends is improved due to crosslinking with the metal ions. Calcium chloride and barium chloride forms strong crosslink with the blend. Calcium ion crosslinked blends can be considered suitable for biomedical drug applications. The investigations on crosslinked blends using FTIR, SEM, XRD and EDAX are in close agreement with swelling results. © 2016 The Polymer Society of Korea. All rights reserved.
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2016
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Journal Article
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Dr. Amrita Thakur and Dr. S. Giridhar Reddy, “Biological Materials: Green Source Towards Silver Nanomaterials Synthesis”, Oriental Journal of Chemistry, vol. 32, no. 3, pp. 1465-1472, 2016.[Abstract]
The synthesis of silver nanoparticles is of great importance because of the fact that their application is sensitive to the shape, size and its distribution. Bio medical application also demands that nanoparticles should be free from contaminants. Quest for synthetic methods which are benign to both human and environment led researchers to use locally available biogenic products for silver nanoparticle synthesis. Present review article, is based on the available literature on the use of microorganisms and plants for silver nanoparticle synthesis. Also the factors affecting the synthesis, role of phyto chemicals and proposed application of synthesized nanoparticles have been reported. More »»
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2016
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Journal Article
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Dr. S. Giridhar Reddy, Dr. Akanksha Saxena Pandit, Dr. Amrita Thakur, and , “가교제가 Sodium Alginate 와 Lignosulphonic Acid 의 블렌드에 미치는 영향”, Polymer (Korea), vol. 40, pp. 63–69, 2016.[Abstract]
Blends of sodium alginate (SA) and lignosulphonic acid (LS) has been prepared in the ratio of 80/20. The prepared blends were crosslinked using chlorides of calcium, barium, strontium and aluminum. The crosslinking of blends was done for different time intervals and then these blends were subjected for swelling studies in aqueous medium of pH 7.4. The observations indicate that the crosslinking is diffusion controlled and is affected by the size of metal ion and the type of alginate used. The improved swelling time for crosslinked blends in aqueous medium supports the fact that the stability under physiological conditions of the blends is improved due to crosslinking with the metal ions. Calcium chloride and barium chloride forms strong crosslink with the blend. Calcium ion crosslinked blends can be considered suitable for biomedical drug applications. The investigations on crosslinked blends using FTIR, SEM, XRD and EDAX are in close agreement with swelling results. More »»
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2013
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Journal Article
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B. Ka Rai, Dr. Amrita Thakur, and , “Spectroscopic characterization of Co(II), Ni(II) and Cu(II) complexes with nitrogen and oxygen containing schiff base derived from 3-amino-2- methylquinazoline-4(3H)-one”, Asian Journal of Chemistry, vol. 25, pp. 583-584, 2013.[Abstract]
A bidentate nitrogen/ oxygen containing Schiff base ligand, 3-amino-2-methyl quinazoline-4(3H)hydrazone (AMQH) and its Co(II), Ni(II) and Cu(II) complexes have been synthesized and characterized by molar mass, elemental analyses, spectral (IR and electronic) molar conductivity measurements at the room temperature. On the basis of above spectral and physicochemical studies it is proposed that ligand 3-amino-2-methyl quinazoline-4(3H)hydrazone acts in a bidentate manner and coordination proposes through amino group of quinazoline and azomethine N atom. The remaining coordination of metal ions are satisfied by negative ions such as Cl-, Br-, I- and NO3 -. The electronic spectral data proposes an octahedral geometry for Ni(II) and Co(II) while the geometry of Cu(II) complexes are proposed to be distorted octahedral in nature.
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2012
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Journal Article
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B. Ka Rai, Kumari, Rb, and Dr. Amrita Thakur, “Antimicrobial screening of Co(ii), Ni(ii) and Cu(ii) complexes with nitrogen and oxygen containing schiff base”, Oriental Journal of Chemistry, vol. 28, pp. 943-948, 2012.[Abstract]
<p>This study reports the preparation and spectroscopic evaluation of a series of transition metal complexes of Co(II), Ni(II), and Cu(II) with schiff base ligand 1-ethyl, 1, 2, 3, 5, tetrahydroimidazo (2, 1-b) quinazolin 5-one semicarbazone (ETQS). The ligand and its Co(II), Ni(II) and Cu(II) complexes were formulated by elemental analysis, molar mass, infrared spectra, electronic spectra, molar conductivity and magnetic susceptibility measurements. In the light of above studies it is proposed that the compound ETQS behaves a bidentate ligand and coordination takes place through azomethine nitrogen and carbonyl oxygen of semicarbazone moiety. The remaining positions of metal Ions are satisfied by negative ions such as Cl- , Br, l- and NO3- . The complexes were proposed octahedral geometry. All the synthesized ligand and complexes have been screened for antimicrobial activity.</p>
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1999
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Journal Article
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Dr. Amrita Thakur, P, C. S., C, R. H., S, S. A., and Raj, iv, K., “Complexes of Cobalt(II), Nickel(II) and Copper(II) with an Ambivalent Schiff Base Ligand”, Asian Journal of Chemistry, vol. 11, no. 1, pp. 17 - 22, 1999.[Abstract]
Condensation of 1-phenyl-1,2-proparndione-2-oxime with 1,2-diaminobenzene in an ethanolic medium yields a Schiff base ligand, bis-(1-phenyl-2-hydroxyimino-1-propylidene) 1,2-diaminobenzene, H2L. A number of complexes of the types [ML] [M = Co(II), Ni(II), Cu(II}], [M(H2L)X2] [M = Co(II), Ni(II), X = Cl–, Br–, I–, ClO–4, NO–3] and [Cu2LX2] [X = Cl–, Br–, I–, ClO–4, NO–3] have been synthesized and characterized on the basis of their elemental analyses, magnetic moment, infrared and electronic spectral data as well as conductivity measurements where the ligand behaves as a tetradentate ligand in the first two series and in a hexadentate manner in the third one. More »»
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