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Article
Binding of a Cationic Phenazinium Dye in Anionic Liposomal Membrane: A Spectacular Modification in the Photophysic
Chemistry and Physics of Lipids (2009)
  • Debanjana Ghosh, Jadavpur University
  • Debosreeta Bose, Jadavpur University
  • Priyanka Das, Jadavpur University
  • Agnishwar Girigoswami, Jadavpur University
  • Deboleena Sarkar, Jadavpur University
  • Nitin Chattopadhyay, Jadavpur University
Abstract
Interaction of a cationic phenazinium dye, phenosafranin (PSF), with the anionic liposomal vesicle/bilayer of dimyristoyl-l-α-phosphatidylglycerol (DMPG) has been demonstrated using steady state and time resolved fluorescence and fluorescence anisotropy techniques. The charge transfer emission spectrum of PSF shows a dramatic modification in terms of fluorescence yield together with an appreciable hypsochromic shift in the lipid environment. The blue shift indicates a lowering in polarity inside the vesicle as compared to that in bulk water. The fluorescence and fluorescence quenching studies and micropolarity determination reveal that the cationic fluorophore has a profound binding interaction with the anionic DMPG membrane. Anisotropy study indicates the imposition of a motional restriction on the probe inside the bilayer. The electrostatic interaction between the cationic dye and the anionic lipid membrane has been argued to be the reason behind all these observations. The results could be useful in analyzing membrane organization and heterogeneity in natural membranes exploiting PSF or alike compounds as fluorescent probes.
Keywords
  • Liposome,
  • Dimyristoyl-l-α-phosphatidylglycerol (DMPG),
  • Phenazinium dye,
  • Fluorescence,
  • Partition coefficient
Disciplines
Publication Date
October 27, 2009
DOI
10.1016/j.chemphyslip.2009.10.003
Citation Information
Debanjana Ghosh, Debosreeta Bose, Priyanka Das, Agnishwar Girigoswami, et al.. "Binding of a Cationic Phenazinium Dye in Anionic Liposomal Membrane: A Spectacular Modification in the Photophysic" Chemistry and Physics of Lipids Vol. 163 Iss. 1 (2009) p. 94 - 101
Available at: http://works.bepress.com/debanjana-ghosh/14/