Kashipur Michael Madhusudan Mahavidyalaya

Puruliya, India

Kashipur Michael Madhusudan Mahavidyalaya

Puruliya, India
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Mondal S.,Indian Institute of Science | Das T.,Indian Institute of Science | Ghosh P.,Indian Institute of Science | Maity A.,Indian Institute of Science | And 2 more authors.
Chemical Communications | Year: 2013

Surfactant bilayer protected core-shell carbon nanoparticles (CNPs) have been synthesised. Förster resonance energy transfer (FRET) between the core-shell CNPs and two strategically chosen organic dyes has been exploited to characterise the protective surfactant bilayer. This journal is © The Royal Society of Chemistry.

Mondal S.,Indian Institute of Science | Chatti M.,Indian Institute of Science | Mallick A.,Kashipur Michael Madhusudan Mahavidyalaya | Purkayastha P.,Indian Institute of Science
Chemical Communications | Year: 2014

Dopamine functionalized carbon nanoparticles (CNPs) that can act as efficient photoinduced electron donor-acceptor systems depending on the pH of the medium have been synthesized. In acidic media, dopamine on CNPs exists as hydroquinone and serves as an electron donor while under alkaline conditions the corresponding quinone form of dopamine serves as a strong electron acceptor. Application of external NADH to the system can invert the donor-acceptor roles under alkaline conditions. © the Partner Organisations 2014.

Mallick A.,Kashipur Michael Madhusudan Mahavidyalaya | Haldar B.,University of Burdwan | Roy U.K.,Deshabandhu Mahavidyalaya
Chemical Physics Letters | Year: 2013

Steady state absorption, emission, and picosecond time resolved fluorescence and transmission electron microscopic (TEM) techniques have been exploited to substantiate and characterize the formation of a substrate - anchored β-cyclodextrin nanotubular suprastructure in aqueous medium. Experimental results reveal that suprastructure is originated from a purely ground state interaction between a newly developed bisindole based drug molecule namely 3,3′-bis(indolyl)-4-chlorophenylmethane (BICPM) with β-cyclodextrin. The bound drug molecule is susceptible to be released out from the supramolecular complex in a controlled manner by the use of endogenous surfactants and is poised to serve a significant purpose in targeted drug delivery preferably at the intestinal region. © 2013 Elsevier B.V. All rights reserved.

Mallick A.,Kashipur Michael Madhusudan Mahavidyalaya | Roy U.K.,Deshabandhu Mahavidyalaya | Haldar B.,Vivekananda Mahavidyalaya | Pratihar S.,Indian Institute of Technology Bhubaneswar
Analyst | Year: 2012

A new easy-to-synthesize chemosensor, 3,3′-bis(indolyl)-4- chlorophenylmethane (hereafter S), was designed, synthesized and employed as a selective optical chemosensor for fluoride ions. 1H NMR and density functional studies on the system have been carried out to determine the nature of the interaction between S and X - (X = inorganic anions) responsible for the significant fluoride-induced changes in the absorption properties of S. The experimental results reveal that abstraction of an acidic proton of S by the fluoride ion, leading to the formation of anionic species, is responsible for the spectral changes. These changes allow signaling for the fluoride ion to detect and estimate the concentration of fluoride ion present even at the submicromolar level, accurate up to 2 μM. Calculations of the transition energies of S, S -, and S⋯F - (hydrogen bonded complex) show that only S - is responsible for the long-wavelength absorption band in the presence of F -. This journal is © The Royal Society of Chemistry 1212.

Mallick A.,Kashipur Michael Madhusudan Mahavidyalaya | Das P.,Jadavpur University | Chattopadhyay N.,Jadavpur University
Journal of Photochemistry and Photobiology C: Photochemistry Reviews | Year: 2010

The photobehavior of norharmane (9H-pyrido[3,4-b]-indole) (NHM), one of the vastly used skeleton of drugs in therapeutic applications, has recently been the subject of increasing interest due to the finding of their phototoxic and photocarcinogenic properties. Its absorption and fluorescence behavior from different prototropic species show remarkable sensitivity towards the polarity, viscosity and local pH, exhibited by various microheterogeneous bio and biomimetic environments like micelles, reverse micelles, proteins, etc. The significant results obtained for NHM in homogeneous and a series of microheterogeneous environments is reviewed in this account. Much attention has been given to the properties of the excited states, location and biodistribution of NHM in different biological environments. The results can help in understanding the photophysics of the probe in biological environments and in assessing the correlation between different prototropic forms and biological activity. © 2010.

Mallick A.,Kashipur Michael Madhusudan Mahavidyalaya | Mallick A.,Osaka University | Katayama T.,Osaka University | Ishibasi Y.,Osaka University | And 2 more authors.
Analyst | Year: 2011

Norharmane provides a simple unexplored class of anion receptor, that allows for the ratiometric selective detection of F- and HSO 4- ions. The presence of a strong base can easily form hydrogen bonds with the acidic hydrogen bond donor moiety and the relatively strong acid can easily protonate the basic hydrogen bond acceptor moiety, which can modulate the optical response and can detect the anions efficiently with high selectivity. In view of that, it is promising to conceive the use of these systems in various sensing applications as well as in other situations, such as anion transport and purification, where the availability of cheap and easy-to-make anion receptors, would be advantageous.

Roy P.,Kashipur Michael Madhusudan Mahavidyalaya | Sreekesh S.,Jawaharlal Nehru University
Proceedings of the 16th International Association for Mathematical Geosciences - Geostatistical and Geospatial Approaches for the Characterization of Natural Resources in the Environment: Challenges, Processes and Strategies, IAMG 2014 | Year: 2014

Physical alteration of soil characteristics of especially the plough layer (0-20cm) is brought about through land culture.The type of land cover, in fact, is an important factor controlling the soil texture, soil organic carbon (SOC) and soil erosion.The objectives of this paper areto analyze soil particle size distribution in the plough layer and quantify the SOC storage in the finer soil separate under native vegetation cover, cultivated land, eucalyptus plantations and barren land.A digital land cover map of the study area has been generated using Resourcesat-2 image.Soil samples from plots under different land cover types have been collected from depths of 0-10 cm and 10-20 cm.Particle size analysis has been done by dry sieving.SOC content of each soil separate - sand, very fine sand, silt + clay, under different land cover, has been done with the help of Walkley and Black method.Analysis of particle size distribution showed that proportion of sand particle is high.However silt+clay proportions have been found to vary with land cover types.SOC was high in silt+clay particles in general; but tended to increase in the sand fractions when particulate organic matter is incorporated.SOC decreased with soil depth under all land cover conditions but showed a reverse trend in some plots of cultivation. © 2014, Capital Publishing Company.

Thakur R.,Indian Institute of Technology Indore | Mallick A.,Kashipur Michael Madhusudan Mahavidyalaya | Chakraborty A.,Indian Institute of Technology Indore
Photochemistry and Photobiology | Year: 2012

Photophysical properties of two widely used antibiotic fluoroquinolone drugs, namely Norfloxacin (NOR) and Ofloxacin (OFL) have been investigated in biomimicking environments formed by bile salts. Experimental results demonstrate that photophysical enhancement and fall of a particular prototropic species are sensitive to the excitation wavelength in bile salt aggregates. Excitation at shorter wavelengths reveals quenching of fluorescence of these fluoroquinolone with addition of sodium deoxycholate (NaDC), sodium taurocholate (NaTC) and sodium glycodeoxycholate (NaGDC). On the contrary, we observe a steady increase in the fluorescence intensity with a continuous redshift upon excitation at longer wavelength. The experimental results were rationalized in terms of the fact that, neutral and zwitterionic species of fluoroquinolone molecules in bile salt aggregates are selectively excited at shorter wavelength while the cationic form of fluoroquinolone molecules are excited at longer wavelength. The excess hydronium ions in the hydrophilic surface of bile salt aggregates convert the neutral species of NOR and OFL into cationic species causing an enhancement in the emission intensity. We found that NaGDC and NaTC because of the conjugate head group are more effective in converting the neutral species of fluoroquinolones into a cationic species than NaDC. The quenching order is in accordance with hydrophobicity indices of bile salt. © 2012 Wiley Periodicals, Inc.

Sarkar D.,Jadavpur University | Mallick A.,Kashipur Michael Madhusudan Mahavidyalaya | Haldar B.,Vivekananda Mahavidyalaya | Chattopadhyay N.,Jadavpur University
Chemical Physics Letters | Year: 2010

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.

Paul S.,Kalyani University | Mallick A.,Kashipur Michael Madhusudan Mahavidyalaya | Majumdar T.,Kalyani University
Chemical Physics Letters | Year: 2015

The interactions between ellipticine (E) and different hydrogen bond acceptor ions (F-, Cl-, Br- and AcO-) have been investigated theoretically based upon density functional theory (DFT) method. All these hydrogen bonding communications produce interesting modification in the interaction pattern of E. The NBO charge calculation, IR, NMR and UV-vis spectral simulation for E and for all the anionic complexes in different solvents reveal the differential extent of hydrogen bonding leading to the clear selectivity toward fluoride ion in chloroform. Optical spectra and electronic transitions have also been investigated. © EW Materials. All rights reserved.

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