A5021712020- Photochemistry and Electron Transfer Studies
- Free Radicals and Antioxidants
- Advanced oxidation water treatment
- Radical Photochemical Reactions
- Electrochemical Analysis and Applications
- Fullerene Chemistry and Applications
- Oxidative Organic Chemistry Reactions
- Advanced biosensing and bioanalysis techniques
- Polymer Nanocomposite Synthesis and Irradiation
- Metal complexes synthesis and properties
- Vanadium and Halogenation Chemistry
- Graphene research and applications
- Biosensors and Analytical Detection
- Lanthanide and Transition Metal Complexes
- Electron Spin Resonance Studies
- Phytochemicals and Antioxidant Activities
- Influenza Virus Research Studies
- Electrochemical sensors and biosensors
- Atmospheric chemistry and aerosols
- Radioactive element chemistry and processing
- Carbon Nanotubes in Composites
- Synthesis and Biological Evaluation
- Synthesis and Properties of Aromatic Compounds
- Analytical Chemistry and Chromatography
- Surfactants and Colloidal Systems
Maharshi Dayanand University
2019-2024
Indian Institute of Technology Indore
2015
Sawai ManSingh Medical College and Hospital
2014
Indian Institute of Technology Delhi
2012
Bhabha Atomic Research Center Hospital
2006-2011
Bhabha Atomic Research Centre
2001-2010
Mahatma Gandhi University
2002-2006
Advanced Materials and Processes Research Institute
2006
Chemical Dynamics (United States)
2002-2005
California Institute of Technology
2002
Ellagic acid, a plant-derived polyphenol, inhibits gamma-radiation (hydroxyl radical) induced lipid peroxidation in rat liver microsomes dose- and concentration-dependent manner. Its antioxidant capacity has been estimated using the 1,1-diphenyl-2-picrylhydrazyl radical assay. To understand actual mechanisms involved activity free scavenging ability,a nanosecond pulse radiolysis technique employed. The rate constants for reactions of several reactive oxygen species nitrogen such as hydroxyl,...
Fenugreek (Trigonella foenum-graecum) is used as a spice, vegetable and medicinal plant. Since antioxidant properties have been linked to health benefits of natural products, such were studied in germinated fenugreek seeds which are considered be more beneficial than dried seeds. Different fractions the determine their potential at different levels. The assays employed ferric reducing power, radical scavenging by 1,1-diphenyl-2-picrylhydrazyl,...
The excited-state photophysical properties of curcumin in the presence bovine serum albumin (BSA) have been studied. absorption and fluorescence changes on binding to BSA followed at varying concentrations either or determine constant, which has found be ∼104 105M−1. Stopped-flow kinetics studies suggested least two distinct kinetic steps for BSA. singlet-excited state curcumin–BSA complex also Whereas spectrum is redshifted, was blueshifted quantum yield complexing with ∼0.05. Steady-state...
Abstract The aqueous extract of the fruits Emblica officinalis (T1), Terminalia chebula (T2) and belerica (T3) their equiproportional mixture triphala were evaluated for in vitro antioxidant activity. γ ‐Radiation induced strand break formation plasmid DNA (pBR322) was effectively inhibited by its constituents concentration range 25–200 µg/mL with a percentage inhibition T1 (30%–83%), T2 (21%–71%), T3 (8%–58%) (17%–63%). They also radiation lipid peroxidation rat liver microsomes IC 50...
Transgenic Escherichia coli expressing pyrroloquinoline-quinone (PQQ) synthase gene from Deinococcus radiodurans showed superior survival during Rose Bengal induced oxidative stress. Such cells significantly low levels of protein carbonylation as compared to non-transgenic control. In vitro, PQQ reacted with reactive oxygen species rate constants comparable other well known antioxidants, producing non-reactive molecular products. also protected plasmid DNA and proteins the damage caused by...
Turmeric (Curcuma longa) has been used in Indian cooking, and herbal remedies. Its possible mechanism of action was examined terms antioxidant availability during actual cooking conditions therapeutic applications using standardized extracts. The assays involve different levels such as oxygen radical absorbance capacity (ORAC), scavenging abilities 1,1-diphenyl-2-picryl hydrazyl (DPPH), 2,2'-azobis-3-ethylbenzthiazoline-6-sulfonic acid (ABTS), ferric reducing power (FRAP) protection...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInclusion Complex of .gamma.-Cyclodextrin-C60: Formation, Characterization, and Photophysical Properties in Aqueous SolutionsK. I. Priyadarsini, H. Mohan, A. K. Tyagi, J. P. MittalCite this: Phys. Chem. 1994, 98, 17, 4756–4759Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissue 1 April 1994https://pubs.acs.org/doi/10.1021/j100068a044https://doi.org/10.1021/j100068a044research-articleACS...
Reactions of superoxide-crown ether complex with curcumin have been studied in acetonitrile. Optical absorption spectra showed that on reaction superoxide forms a blue color intermediate absorbing at 560 nm, which subsequently decayed few hours the development band corresponding to parent curcumin. The regeneration was 100% low concentrations (1:1, or 1:2 1:3 curcumin:superoxide) but reduced 60% high concentration (>1:5). is confirmed by HPLC analysis. Stopped-flow studies acetonitrile...
The reactions of SO˙–4 with several substituted benzenes having the general formula, C6H5–nXnY (where X = F, Cl or Br and Y CH3, CH2Cl, CHCl2, CF3 OCH3), have been investigated in aqueous solution by pulse radiolysis. transient absorption spectra exhibit maxima at 315–330 nm additional peaks 270–290 chlorotoluenes weak around 400 chlorobenzene 3-chlorofluorobenzene. Only case 3-chloroanisole is observed spectrum different, exhibiting two distinct 290 475 nm. second-order rate constants for...