• Anindya Datta

      Articles written in Journal of Chemical Sciences

    • Evidence for covalent binding of epicocconone with proteins from synchronous fluorescence spectra and fluorescence lifetimes

      Debashis Panda Anindya Datta

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      Synchronous fluorescence and time-resolved fluorescence spectroscopic studies that reveal the interaction of epicocconone with human serum albumin is significantly different from its interaction with surfactant assemblies. This observation, along with steady-state fluorescence data, indicates groundstate interaction between the fluorophore epicocconone and the protein. Similarity in fluorescence properties with the adduct of the fluorophore with 𝑛-butylamine indicates that bonding occurs at the Nterminus of the protein.

    • Silica nanodisks as platforms for fluorescence lifetime-based sensing of pH

      Subhasree Banerjee Anjali Dhir Tuseeta Banerjee Avinash Kumar Singh Anindya Datta

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      Core-shell conjugates of silica nanodisks and fluorescent dyes have been prepared. Rhodamine B, the reference, has been attached to the core, by surface functionalization of the pristine SNDs. Then, a layer of silica has been deposited on the composite nanodisks. Finally, the surface has been functionalized with fluorescein in one case and protoporphyrin IX in the other. These dyes exhibit pH-dependent fluorescence properties. The nanoconjugates are found to sense the pH of the medium, through systematic variation of the fluorescence intensity ratios of the reporter dye at the surface and the reference dye at the core. Moreover, the fluorescence lifetimes and corresponding amplitudes of the reporter dyes have been found to be reliable parameters for assessing the pH of the medium, even though the variation in lifetimes of fluorescein is rather small. In case of protoporphyrin, however, this variation is significantly large. Besides, the change in amplitudes is prominent in acidic as well as alkaline solutions. The temporal parameters can thus be used to ascertain the pH of the medium, when used in conjunction with each other.

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