Qualification: 
Ph.D, MSc
t_amrita@blr.amrita.edu

Dr. Amrita Thakur currently serves as Assistant Professor  at department of Chemistry, Amrita School of Engineering, Bengaluru campus.

YEAR DEGREE/PROGRAM INSTITUTION
1999 PhD BBA Bihar University
1993 M.Sc (Inorganic Chemistry) BBA Bihar University

Projects

National Mission project on Education through ICT

Publications

Publication Type: Journal Article

Year of Publication Publication Type Title

2021

Journal Article

D. Smita Singh and Dr. Amrita Thakur, “Red mud based binder: A sustainable material for removal of chromium (VI) from water”, Materials Today: Proceedings, 2021.

2020

Journal Article

Dr. Amrita Thakur and Dr. S. Giridhar Reddy, “Spectrophotometric detection of mercury using lignosulphonic stabilizedsilver nanopaticles ”, Iranian Journal of Materials Science & Engineering, vol. Vol. 17, No. 3 vol., 2020.[Abstract]


Mercury, one of the common pollutants in water, is known to affect human health adversely upon exposure. It is released in water not only by various natural processes but also by human activities. Methods developed so far for the detection of mercuric ions in water have limitations like sensitivity range, complex setup, skillful operation etc. Silver nanoparticles, due to unique properties, have been explored by researchers to develop better detection systems. Stable silver nanoparticles can be easily synthesized by methods of green chemistry, its reaction with mercuric ion can be easily observed by changes in color and UV-Vis spectra. The absorbance data from UV-Vis spectra can also be used in quantifying mercury concentration. In this paper, stable silver nanoparticles synthesized using silver nitrate as precursor, sodium lignosulphonate (LS) as reducing and stabilizing agent under microwave radiation are explored for detection of mercuric ions in water. Formation of Ag nanoparticles was confirmed by UV-Vis band at 403.5nm. The intensity of this band showed a proportional decrease with increasing Hg+2 concentration. Hg+2 ions were detected by a distinct color change at higher concentration of Hg+2 also. The limit of detection (LOD) calculated from the observed absorbance data to be 0.7 ppm.

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2020

Journal Article

Parul Mathur, Dr. Amrita Thakur, and Dr. Dhanesh G. Kurup, “An artificial neural network-based non-destructive microwave technique for monitoring fluoride contamination in water”, Journal of Electromagnetic Waves and Applications, vol. 34, pp. 1-11, 2020.[Abstract]


This article presents a novel non-destructive microwave technique for predicting fluoride contamination in pure water. The proposed microwave-based sensing technique uses an open-ended coaxial probe (OECP) microwave sensor for monitoring fluoride concentration in water. The sensor output is the input of Artificial Neural Network (ANN) for predicting the complex dielectric constant of contaminated water, which has direct correlation with fluoride contamination in water. The ANN is trained through analytically generated sensor output for various lossy liquid materials and tested for experimental data obtained through laboratory prepared samples. Hence, the proposed technique has the capability to compute the amount of fluoride contamination faster, when compared to analysis only method. The results shows that a well-trained ANN is computationally efficient and capable of predicting the amount of fluoride level in the pure water. The results also has good agreement with the data published in the literature at room temperature.

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2019

Journal Article

Dr. S. Giridhar Reddy and Dr. Amrita Thakur, “Thermal stability and kinetics of sodium alginate and lignosulphonic acid blends”, Iranian Journal of Materials Science and Engineering, vol. 15, p. 53, 2019.[Abstract]


Biodegradable polymer blends are prepared by solution casting method by mixing Sodium alginate (SA) and Lignosulphonic acid (LS) biodegradable polymers. In order to investigate for controlled drug delivery the thermal stability of polymer blends are the primary requirements because they should be stable in aqueous medium. The polymer blends are studied using thermogravimetric analysis. The TGA data are used to analyze degradation temperature and energy of activation using ‘Horowitz and Metzger’ an approximate integral method. The energy of activation reveals that blends are stable as compared to their polymers.

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2019

Journal Article

Dr. S. Giridhar Reddy and Dr. Amrita Thakur, “Drug Entrapment Efficiency of Silver Nanocomposite Hydrogel”, IOP Conference Series: Materials Science and Engineering, vol. 577, p. 012176, 2019.[Abstract]


Silver nanocomposite hydrogel (SNH) with biodegradable polymers, sodium alginate and sodium lignosulphonate was synthesized employing principles of green chemistry for possible application in the field of controlled drug release. One of the factor that determines the release of drug from blend is the quantity of drug present/trapped inside the polymer network. The entrapment of drug in the polymer matrix depends upon the stability of matrix and interaction between the drug and the matrix. In the present study effect of presence silver nanoparticles in the polymeric matrix on the Drug Entrapment Efficiency (DEE) for the drug ciprofloxacin (CPX) was investigated. The drug entrapment efficiency for CPX loaded beads of SA/LS was calculated for similar conditions, to evaluate the effect of silver nanoparticles. Experimental results confirmed role of crosslinking and presence of silver nanoparticles on the stability of SNH and its entrapment efficiency. Observations indicate that the drug entrapment is more for the SNH as compared to the blend. Presence of silver nanoparticles help stabilize the polymer matrix, improves binding inside the matrix, which leads to the better drug entrapment.

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2018

Journal Article

A. M.S.K., Dr. Amrita Thakur, Dr. Deepa Gupta, and B. Sreevidya, “Time series analysis of air pollution in bengaluru using ARIMA model”, Advances in Intelligent Systems and Computing, vol. 696, pp. 413-426, 2018.[Abstract]


Air pollution control measures in India are still in its infancy, while the country is developing at a faster rate. Development is known to affect the air quality of a place adversely. The key to manage the air quality of a place is proper planning, and for that, robust forecasting system based on continuous monitoring is required. Bengaluru is a city which has grown in size and population in the past decades. This rapid growth has affected its environmental quality. The present work deals with development of air quality prediction model based on Autoregressive Integrated Moving Average (ARIMA). For this, pollution data of NO2, PM10 and SO2 from January 2013 to March 2016, 14 pollution monitoring stations has been used. The results show that data which satisfies the stationary condition can be used as an accurate prediction model. NO2 residential and RSPM residential satisfy this condition. © Springer Nature Singapore Pte Ltd. 2018.

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2018

Journal Article

Dr. S. Giridhar Reddy and Dr. Amrita Thakur, “Thermal stability and kinetics of sodium alginate and lignosulphonic acid blends”, Iranian Journal of Materials Science and Engineering, vol. 15, pp. 53-59, 2018.[Abstract]


Biodegradable polymer blends are prepared by mixing two natural biodegradable polymers Sodium alginate (SA) and Lignosulphonic acid (LS) by solution casting method for controlled drug delivery application. Successful application of blend for controlled drug delivery requires its stability under physiological condition. Thermal analysis (TGA) reveal thermal transitions, degradation processes and thermal stability’ of blends and gives an important insight about its stability’. In this paper TGA data has been used to evaluate degradation of SA/LS blends with temperature. The energy’ of activation for the thermal degradation of polymers and blends has been calculated by ‘Horowitz and Metzger' method. These studies reveal that blends are stable as compared to their polymers. © 2018, Iran University of Science and Technology. All rights reserved.

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2018

Journal Article

Dr. Amrita Thakur and Dr. S. Giridhar Reddy, “ Silver Nanocomposite Hydrogel for pH Responsive Controlled Drug Release Applications”, Journal of Bionanoscience, vol. 12, 6 vol., 2018.[Abstract]


This work is aimed at developing hydrogel of sodium alginate (SA) with properties suitable for controlled release applications. The hydrogel was synthesized by blending SA with Lignosulphonic acid (LS) stabilized silver nanoparticles. Its characterization was done by UV-vis spectroscopy, FTIR, XRD and TGA techniques. A single peak at 405.2 nm of UV-visible spectra confirmed presence of monodispersed and spherical silver nanoparticles (SNP), stabilization of SNP by LS was confirmed from FTIR and crystallinity by XRD. Beads from drug loaded hydrogel showed sustained release of both drug and silver nanoparticles in pH 7. It was also observed that the silver nanoparticle loaded hydrogel bead showed better stability and drug release ability than SA/LS hydrogel beads. The synthesized hydrogel can be investigated further with other antibiotics for synergistic applications against pathogens.

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2018

Journal Article

Dr. Amrita Thakur and Dr. S. Giridhar Reddy, “Development of Water Stable Lignosulphonic Acid Biocomposite Material Containing Silver Nanoparticles”, Journal of Bionanoscience, vol. 12, pp. 1-7, 2018.[Abstract]


ne pot synthesis of lignosulhonic acid (LS) based bionanocomposite material containing silver nanoparticle (AgNP) was achieved. LS acted as both reducing and stabilising agent in aqueous medium. Reaction variables such as reactant and stabilising agent concentration, temperature and time were optimised. Progress of reaction and characterisation of material was done by using advanced instrumentation techniques like UV-Vis spectroscopy, FTIR, XRD, and TEM. Nearly spherical and stable nanoparticles of average size 4-10 nm was achieved. Characteristic SPR band at 409 nm and TEM images indicated synthesis of mono dispersed and nearly spherical AgNP. XRD and SAED results confirmed polycrystalline AgNP with face centred cubic structure. Uniqueness of developed material is its insolubility and very high stability in water. It has also shown no release of AgNP in water.

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2017

Journal Article

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.

2017

Journal Article

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.

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2017

Journal Article

Dr. Amrita Thakur and Dr. S. Giridhar Reddy, “Green Synthesis of Silver Nanoparticles Using Sodium Alginate and Lignosulphonic Acid Blends”, IOP Conference Series: Materials Science and Engineering, vol. 225, p. 012170, 2017.[Abstract]


A simple method based on the principles of green chemistry has been developed to synthesize stable silver nanoparticles (AgNP) for possible biomedical applications. Blend of sodium alginate (SA) and lignosulphonic acid (LS) prepared in the ratio of 80/20 mass percent respectively was used as reducing and stabilizing agent. This blend is biocompatible and has shown drug release ability under physiological conditions. Use of blend has an added advantage as LS has the ability to reduce silver while the blend matrix acts as a stabilizing agent. Effect of precursor concentration (AgNO3) and temperature was investigated. Progress of synthesis was monitored using UV-Vis spectroscopy. Higher temperature and lower silver nitrate concentration showed better synthesis of AgNP.</p>

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2016

Journal Article

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

Journal Article

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 »»

2016

Journal Article

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 »»

2013

Journal Article

B. K. Rai, Dr. Amrita Thakur, and Divya, “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

Journal Article

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

Journal Article

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.

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Publication Type: Conference Paper

Year of Publication Publication Type Title

2019

Conference Paper

P. Mathur, Dr. Amrita Thakur, R. Augustine, and Dr. Dhanesh G. Kurup, “A novel Non-Invasive Microwave Technique for monitoring Salinity in Water”, in TENCON 2019 - 2019 IEEE Region 10 Conference (TENCON), Kochi, India, 2019.[Abstract]


The paper presents a novel non-invasive microwave technique for monitoring salt concentration in pure water. The technique is based on near field analysis of open ended coaxial probe (OECP) sensor with material under test (MUT) using plane wave spectrum theory. The proposed technique is compared with experimental results for various concentration of salt solution between 1GHz to 10GHz range. The computed result shows good agreement with experiment. The microwave technique shows better result at lower microwave frequency as compared to higher frequency. At 2GHz range the response of the technique and measurement shows a linear relationship with the salt concentration. The technique shows the potential of extracting the physical parameter, like permittivity, of the salty water.

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2016

Conference Paper

Dr. Amrita Thakur and Dr. S. Giridhar Reddy, “Green Synthesis Of Silver Nanoparticles Using Sodium Alginate And Lignosulphonic Acid Blends”, in International Conference on Advanced Material Technologies (ICAMT), 2016.[Abstract]


A simple method based on the principles of green chemistry has been developed to synthesize stable silver nanoparticles (AgNP) for possible biomedical applications. Blend of sodium alginate (SA) and lignosulphonic acid (LS) prepared in the ratio of 80/20 mass percent respectively was used as reducing and stabilizing agent. This blend is biocompatible and has shown drug release ability under physiological conditions. Use of blend has an added advantage as LS has the ability to reduce silver while the blend matrix acts as a stabilizing agent. Effect of precursor concentration (AgNO3) and temperature was investigated. Progress of synthesis was monitored using UV-Vis spectroscopy. Higher temperature and lower silver nitrate concentration showed better synthesis of AgNP.

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Publication Type: Conference Proceedings

Year of Publication Publication Type Title

2015

Conference Proceedings

Dr. S. Giridhar Reddy and Dr. Amrita Thakur, “Greener Approach towards the Synthesis of Silver Nanoparticles by Biological Methods”, RAINSAT 2015. Sathyabama University, India, 2015.

Faculty Research Interest: