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Barddhamān, India

Sharma K.,Vivekananda Mahavidyalaya | Sharma S.P.,Central Forensic Science Laboratory | Lahiri S.C.,Central Forensic Science Laboratory

Numerous methods like distillation followed by iodometric titrations, gas chromatograph (GC)-flame ionization detector, gas chromatograph-mass spectrophotometer, GC-Headspace, Breath analyzer, and biosensors including alcohol dehydrogenase (enzymatic) have been used to determine blood alcohol concentration (BAC). In the present study, horizontal attenuated total reflectance-Fourier transform infrared spectroscopy had been used to determine BAC in whole blood. The asymmetric stretching frequency of C-C-O group of ethanol in water (1,045cm-1) had been used to calculate BAC using Beer's Law. A seven-point calibration curve of ethanol was drawn in the concentration range 24-790mg dL-1. The curve showed good linearity over the concentration range used (r2=0.999, standard deviation=0.0023). The method is accurate, reproducible, rapid, simple, and nondestructive in nature. © 2010 Elsevier Inc. Source

Mondal P.,Vivekananda Mahavidyalaya | Saha S.K.,Visva Bharati University | Chowdhury P.,Visva Bharati University
Journal of Applied Polymer Science

Quantitative polymerization of 4-vinyl pyridine (4-VP) and its quaternization has been done simultaneously for the first time in absence of organic solvents. 1, 4-dibromo-2-butene acts as quaternizing agent. The quaternized polymer has been characterized by chemical, thermal and spectral analysis. The mechanistic path involved in the polymerization and quaternization has been elucidated. Particle size, surface area, ion exchange capacity and metal ion binding property were determined. The polymer was found to have pH-dependent chromate ion binding capacity with high level of selectivity and good antibacterial activity. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 Copyright © 2012 Wiley Periodicals, Inc. Source

Methyldopa is a much used antihypertensive drug. It is the subject matter of study mostly for the determination and estimation of methyldopa in pharmaceutical properties. These considerations led us to study the charge-transfer interactions between methyldopa, a centrally acting antihypertensive agent of limited use with the known acceptors like o-chloranil (o-ClN), chloranilic acid (ClA) and dichlorodicyanobenzoquinone (DDQ). Methyldopa (MDP) formed beautifully colored complexes (having absorption maxima at 581 nm and 368 nm; 519 nm; 583.5 nm, 547 nm and 346 nm, respectively) with the acceptors mentioned before. The physico-chemical properties of the complexes were studied using UV-visible spectrophotometry and FTIR measurements. The composition, the accurate association constants and thermodynamics of the complexes were determined spectrophotometrically. Attempts were made to interpret the thermodynamics of complexes in terms of IDV, EAV and hν CT. Solid CT complexes between MDP + o-ClN, MDP + ClA and MDP + DDQ were prepared and FTIR spectra of the complexes were studied. The energies hν CT of the charge-transfer complexes and vertical ionization potential IDV of methyldopa were compared with the theoretical values of hν CT obtained from HOMO and LUMO of the donors and acceptors calculated using Density Function Theory utilizing different basis sets. The agreement between the results can be regarded to be reasonable. Oscillator strengths and dipole strengths of the complexes were determined theoretically and experimentally and the limitations of the calculations were outlined. © 2012 Elsevier B.V. All rights reserved. Source

Banerjee S.,Darjeeling Government College | Banerjee S.,University of Burdwan | Sengupta P.S.,Vivekananda Mahavidyalaya | Mukherjee A.K.,University of Burdwan
Chemical Physics Letters

A hydrolysis process of the third generation orally active anticancer drug cis-[PtCl2(NH3)(2-picoline)], ZD0473 has been investigated using density functional theory. Pentacoordinated platinum transition state (TS) geometries along with other stationary points on potential energy surface were optimized and characterized including two different paths. Two explicit water molecules were included in the calculations to improve the solvation energies. To obtain accurate energies for the reaction surfaces, single-point energies were calculated by conductor-like polarisable continuum model (CPCM) using larger basis sets. The calculated results show that the second step is the rate-limiting process. The computed values of rate constant of different steps are in good agreement with the available experimental results. © 2010 Elsevier B.V. All rights reserved. Source

Sarkar D.,Jadavpur University | Mallick A.,Kashipur Michael Madhusudan Mahavidyalaya | Haldar B.,Vivekananda Mahavidyalaya | Chattopadhyay N.,Jadavpur University
Chemical Physics Letters

An alternative strategy, hybridizing the proper choice of a pH sensitive fluorophore and the ratiometric technique of plot of the spectral parameters of the probe, has been introduced for the generation of new molecular sensors for multidimensional purposes. Various anions present in aqueous medium or biological fluids through alkali metal salts, can be detected and estimated. Selectivity factor turns out to be dependent on the dissociation constant of the conjugate acid of the anion to be detected. The technique can be exploited for the sensing of cyanide ion, a supremely toxic anion, accurate to the micromolar level of concentration. © 2009 Elsevier B.V. All rights reserved. Source

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