Spectroscopic investigations on the interaction of an anionic probe with nonionic micelles of Igepal surfactants in aqueous media

Moore, Stephanie A.; Palepu, R.

doi:10.1080/00268970601037683

Cited by 8 publications

(8 citation statements)

References 9 publications

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“…The hydrophobic uorescent molecular probe ANS has been widely used to sense the micropolarity of various organized media like micelles, lipid bilayer membranes, and hydrogels. [25][26][27][28] ANS is almost non-uorescent in a polar medium and highly uorescent in a non-polar medium. 27,28 Highly polar environment promotes the intramolecular charge transfer in ANS which leads to a smaller quantum yield and a red shi in emission, but in a non-polar environment, the absence of intramolecular charge transfer leads to a high quantum yield and a blue shi in emission.…”

Section: Fluorescence Intensity Studymentioning

confidence: 99%

“…27,28 Highly polar environment promotes the intramolecular charge transfer in ANS which leads to a smaller quantum yield and a red shi in emission, but in a non-polar environment, the absence of intramolecular charge transfer leads to a high quantum yield and a blue shi in emission. 27,28 Fig. 3 shows the uorescence emission spectra of ANS in the GTHCC hydrogel with an increase in temperature.…”

Section: Fluorescence Intensity Studymentioning

confidence: 99%

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Thermotropic gelation induced changes in micropolarity and microviscosity of hydrogel derived from glucose-triazole-hydrogenated cardanol conjugate: a study using fluorescent molecular probe

et al. 2014

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Section: Fluorescence Intensity Studymentioning

confidence: 99%

Section: Fluorescence Intensity Studymentioning

confidence: 99%

Thermotropic gelation induced changes in micropolarity and microviscosity of hydrogel derived from glucose-triazole-hydrogenated cardanol conjugate: a study using fluorescent molecular probe

et al. 2014

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“…[22][23][24][25] Due to intramolecular charge transfer, ANS shows a smaller quantum yield and a red shifted emission in a polar medium, whereas a non-polar medium leads to enhancement of its quantum yield with a blue shifted emission. [22][23][24][25] Due to intramolecular charge transfer, ANS shows a smaller quantum yield and a red shifted emission in a polar medium, whereas a non-polar medium leads to enhancement of its quantum yield with a blue shifted emission.…”

Section: Resultsmentioning

confidence: 99%

“…The fluorescent molecular probe ANS has been widely used as a polarity indicator in various organized media and biological systems. [22][23][24][25] Due to intramolecular charge transfer, ANS shows a smaller quantum yield and a red shifted emission in a polar medium, whereas a non-polar medium leads to enhancement of its quantum yield with a blue shifted emission. 26 In order to have information regarding the aggregation behavior of the FTY720 drug molecule in aqueous solution, ANS was used as a fluorescent molecular probe.…”

Section: Resultsmentioning

confidence: 99%

Study of aqueous phase aggregation of FTY720 (fingolimod hydrochloride) and its effect on DMPC liposomes using fluorescent molecular probes

Swain

Mohapatra

Borkar

et al. 2013

Phys. Chem. Chem. Phys.

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This work focuses on the study of aqueous phase aggregation of the recently FDA approved oral drug molecule FTY720 (fingolimod hydrochloride) and its effect on dimyristoylphosphatidylcholine (DMPC) liposomes using different fluorescent molecular probes and fluorescence parameters. The variation of the steady state fluorescence intensity of 8-anilino-1-naphthalene sulfonic acid (ANS) with FTY720 in water shows an efficient micellar aggregation with the critical micellar concentration (CMC) at ~75 μM. The aggregation number calculation from steady state fluorescence quenching of pyrene shows the formation of small micellar aggregates in aqueous solution having an aggregation number of 42 ± 3 with the free energy of micellization ~-23 kJ mol(-1). Fluorescence intensity and lifetime decay analysis of the molecular probe 1-naphthol indicate that the interaction of FTY720 with the DMPC lipid bilayer membrane prevents partitioning of small molecules such as 1-naphthol to the membrane in both solid gel (SG) and liquid crystalline (LC) phases. Temperature dependent fluorescence intensity studies of 1-naphthol and fluorescence anisotropy measurements of 1,6-diphenyl-1,3,5-hexatriene (DPH) have shown that above the CMC of FTY720, the SG to LC main phase transition temperature (T(M)) of the lipid bilayer membrane decreases from 23 °C to 21 °C in the aqueous medium.

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“…The fluorescence method was used by various investigators to determine the critical micelle concentration (Birdi et al 1977;Mast and Haynes 1975). More recently, its florescence response in micellar solution has been studied at different wavelengths (Moore and Palepu 2006).…”

Section: Introductionmentioning

confidence: 99%

Study of an Amphoteric Surfactant in a Soil Decontamination Process Using ANS Enhanced Fluorescence: Micellar Behavior and Dosing in Synthetic and Soil Solutions

Castellazzi

Mercier

Blais

2011

Water Air Soil Pollut

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Cocamidopropyl hydroxysultaine (CAS) has been used in a pilot plant study as a biodegradable surfactant for the extraction of polycyclic aromatic hydrocarbons (PAHs) and lead (Pb) from contaminated soils. The soil treatment has been done in flotation cells with a concentration of 0.20 gCAS L −1 in saline conditions (3 M NaCl) and using a pulp density of 20% (w/w). The process integrates the recirculation of the liquid phases separated from the soil by centrifugation or filtration. Thus, it was necessary to understand CAS-PAHs micellar behavior and to follow the behavior and the fate of the surfactant in the process. 1-8-anilino-naphthalene sulfonate (ANS) is used as a fluorophor compound in the ANS enhanced fluorescence technique. A three-dimensional model detailing the change in the micellar behavior at high NaCl concentration and at different pH has been established. Fluorescence results of centrifuged soil matrix containing CAS have been compared to the results from synthetic solutions assays. A method allowing an accurate titration of the CAS has been developed by using the exact same matrix of the soil as the tested samples for the preparation of the calibration curves. The study of the surfactant concentration in the process has been performed and allows the adjustment of the CAS concentration in the recirculated water.

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Spectroscopic investigations on the interaction of an anionic probe with nonionic micelles of Igepal surfactants in aqueous media

Cited by 8 publications

References 9 publications

Thermotropic gelation induced changes in micropolarity and microviscosity of hydrogel derived from glucose-triazole-hydrogenated cardanol conjugate: a study using fluorescent molecular probe

Thermotropic gelation induced changes in micropolarity and microviscosity of hydrogel derived from glucose-triazole-hydrogenated cardanol conjugate: a study using fluorescent molecular probe

Study of aqueous phase aggregation of FTY720 (fingolimod hydrochloride) and its effect on DMPC liposomes using fluorescent molecular probes

Study of an Amphoteric Surfactant in a Soil Decontamination Process Using ANS Enhanced Fluorescence: Micellar Behavior and Dosing in Synthetic and Soil Solutions

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