Photophysics of a β-carboline based non-ionic probe in anionic and zwitterionic liposome membranes

Das, Paramita; Sarkar, Debdeep; Chattopadhyay, Nitin

doi:10.1016/j.chemphyslip.2008.03.003

Cited by 16 publications

(38 citation statements)

References 46 publications

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“…Further, the CT emission band of AODIQ becomes narrower in the micellar media compared to that in aqueous solution. Similar narrowing of the CT band of AO-DIQ has also been observed in other microheterogeneous environments in our previous studies at their saturation level of interactions [24][25][26][27][28].…”

Section: Steady-state Absorption and Fluorescencesupporting

confidence: 71%

“…After CMCs are attained, there is a huge enhancement in the emission yield of AODIQ in all three nTAB micellar environments studied. The observation of a blue shift in the fluorescence maximum and an increase in the fluorescence quantum yield of AODIQ reflects that the microenvironments around the fluorophore in the nTAB media are quite different from the pure aqueous phase [23][24][25][26][27][28]. The blue shift suggests that the polarity of the local environment of the fluorophore is less than that of the bulk water since a similar blue shift is observed using homogeneous solvents of lower polarity [23].…”

Section: Steady-state Absorption and Fluorescencementioning

confidence: 49%

“…The analysis of the data was done using IBH DAS, version 6, decay analysis software. The time-resolved anisotropy r(t) was calculated using the relation [1,14,28] rðtÞ ¼ ½I II ðtÞ À GI ? ðtÞ=½I II ðtÞ þ 2GI ?…”

Section: Methodsmentioning

confidence: 99%

“…The polarity determined through different photophysical parameters of the probe gives a relative measure of the polarity of the microenvironment around the probe. Local polarity around a probe in biomimetic environments can be estimated by comparison of spectral properties of the fluorophore in the environment with those of the probe in pure solvents or solvent mixtures of known polarities [1,7,[24][25][26][27][28]39]. It is understandable that the polarities of the homogeneous and microheterogeneous media cannot be exactly the same.…”

Section: Steady-state Absorption and Fluorescencementioning

confidence: 99%

“…The polarity-sensitive CT emission of AODIQ has been exploited successfully for demonstrating and characterizing various bio-and biomimetic microenvironments [14,[24][25][26][27][28]. It has also been exploited as an effective fluorosensor for sensing essential trace metals [29].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Photophysics and rotational relaxation dynamics of a β-carboline based fluorophore in cationic alkyltrimethylammonium bromide micelles

Mahata¹,

Sarkar²,

Bose³

et al. 2009

Journal of Colloid and Interface Science

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Section: Steady-state Absorption and Fluorescencesupporting

confidence: 71%

Section: Steady-state Absorption and Fluorescencementioning

confidence: 49%

Section: Methodsmentioning

confidence: 99%

Section: Steady-state Absorption and Fluorescencementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Photophysics and rotational relaxation dynamics of a β-carboline based fluorophore in cationic alkyltrimethylammonium bromide micelles

Mahata¹,

Sarkar²,

Bose³

et al. 2009

Journal of Colloid and Interface Science

Self Cite

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Monitoring Local pH of Membranous Aggregates via Ratiometric Color Changing Response

et al. 2022

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A series of oxidized di(indolyl)arylmethanes (DIAM) with polyaromatic signaling moieties have been designed for monitoring local pH at the interfacial region of surfactant aggregates, such as micelles and vesicles. The oxidized DIAMs show changes in solution color from red to yellow when incorporated in cationic surfactants (at pH 7.4) and yellow to reddish pink when exposed to negatively-charged surfactants (at pH 5.0). The changes in surface charge can influence the interfacial pH (distinct from bulk pH of the medium) of the surfactant aggregates. The mechanistic studies indicate that the red-shifted absorption maxima observed in the presence of anionic amphiphiles (acidic local pH) originated from the protonated species. On the contrary, maxima in the blue region, triggered by positively charged amphiphiles (basic local pH), is attributed to the zwitterionic species. Such prototropic equilibrium affects charge transfer states of the molecules along with their self-assembly properties. Thus, it is evident that probes can predict as well as quantify the local pH change using the pseudophase ion exchange formalism. Also, the probes can detect the presence of anionic amphiphiles even when bound to phospholipid membranes.

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Binding of a cationic phenazinium dye in anionic liposomal membrane: a spectacular modification in the photophysics

Bose

Ghosh

Das

et al. 2010

Chemistry and Physics of Lipids

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Photophysics of a β-carboline based non-ionic probe in anionic and zwitterionic liposome membranes

Cited by 16 publications

References 46 publications

Photophysics and rotational relaxation dynamics of a β-carboline based fluorophore in cationic alkyltrimethylammonium bromide micelles

Photophysics and rotational relaxation dynamics of a β-carboline based fluorophore in cationic alkyltrimethylammonium bromide micelles

Monitoring Local pH of Membranous Aggregates via Ratiometric Color Changing Response

Binding of a cationic phenazinium dye in anionic liposomal membrane: a spectacular modification in the photophysics

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