J. Appl. Cryst.の発刊に際して

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Principles Of Fluorescence Spectroscopy

DLS and zeta potential - What they are and what they are not?

http://molbiol.ru/forums/index.php?act=Attach&type=post&id=75938

Fluorescence probes used for detection of reactive oxygen species

Fluorescence as a potential monitoring tool for recycled water systems: a review.

Interaction of bovine (BSA) and human (HSA) serum albumins with ionic surfactants: spectroscopy and modelling.

Spectroscopic studies on the interaction of bovine (BSA) and human (HSA) serum albumins with ionic surfactants

Interactions of the water-soluble tetra(4-sulfonatophenyl)porphyrin (TPPS4) with ionic micelles in aqueous solutions have been studied by optical absorption, fluorescence, resonance light-scattering (RLS), and 1H NMR spectroscopies The presence of three different species of TPPS4 in cationic cetyltrimethylammonium chloride (CTAC) solution has been unequivocally demonstrated:  free porphyrin monomers, monomers bound to micelles, and nonmicellar porphyrin/surfactant aggregates This result is similar to our previous findings for TPPS4 interactions with biomacromolecules (serum albumin and DNA) The surfactant:porphyrin ratio for maximum aggregate formation is around 4:1−5:1 and 14:1 at pH 30 and pH 75, respectively In the case of zwitterionic N-hexadecyl-N,N-dimethyl-3-ammonio-1-propanesulfonate (HPS) the aggregates were not observed Binding constants estimated from these data were of the order of 104 M-1 for CTAC and HPS Our data show that solubilization of porphyrins within nonpolar regions of micel

Interaction of the Tetra(4-sulfonatophenyl)porphyrin with Ionic Surfactants: Aggregation and Location in Micelles

https://www.jidonline.org/article/S0022-202X(15)42557-6/pdf

Water Increases the Fluidity of Intercellular Membranes of Stratum Corneum: Correlation with Water Permeability, Elastic, and Electrical Resistance Properties

The characteristics of binding of two phenothiazine antipsychothic drugs, chlorpromazine (CPZ) and trifluoperazine (TFP), to anionic sodium dodecyl sulfate (SDS) monomers and/or micelles were investigated using electronic absorption and fluorescence spectroscopies. Binding constants K b and p K a values for the drugs in SDS micelles were estimated using the red shifts of the maximum absorption and changes in absorption upon alkalization or in the presence of surfactant. The p K a shift of CPZ due to its interaction with SDS micelles is about 0.7 unit to higher values, as compared to the reported value of p K a obtained in buffer around 9.3. For TFP the p K a shift is 0.4 unit to higher values compared to that in buffer, reported as 4.0. The electronic absorption spectroscopic data suggest a biphasic interaction as a function of detergent concentration which is quite dependent of the protonation states of the drugs. In the case of TFP a very strong binding takes place when the drug is fully protonated (pH 2.0) and a distinct binding takes place at stoichiometric (low) surfactant concentrations (interaction via surfactant monomers) and at higher concentrations (in the presence of micelles). Static fluorescence probe analysis using pyrene was used to study the nature of the phenothiazine–surfactant premicellar and self-aggregates. The I 3 / I 1 and I 475 / I 1 ratios associated to pyrene fluorescence vibronic bands and excimer intensities ratios, respectively, were monitored for several ratios [SDS]/[drug] and significant changes, dependent of the drug presence and its protonation state, have been observed revealing a hydrophobic microenvironment provided by TFP–SDS aggregates in comparison with CPZ both at pH 7.0 and 4.0. Static anisotropy was also used to monitor the changes of the self-aggregates and micellar packing in the presence of the phenothiazine drugs. In aqueous solutions the anisotropy of the fluorescent probe dipyridamole (DIP) is quite low, being around 0.005 at pH 7.0 and 0.025 at pH 4.0, and the addition of detergent leads to an increase in the values of anisotropy to 0.030 at pH 7.0 and 0.070 at pH 4.0. In the presence of the phenothiazine drugs, and in the premicellar detergent concentration range, the anisotropy of DIP increases to 0.134 and 0.111 (dependent on drug concentration) for CPZ and TFP, respectively, at pH 4.0. These results suggest that the presence of both phenotiazine drugs makes the premicellar aggregates more rigid by decreasing the probe mobility, and are consistent with a more polar localization of the CPZ in the micelles as compared with TFP. At pH 7.0 the anisotropy changes are smaller, suggesting a slight decrease in CMC induced by the phenothiazines.

Marcel Tabak

Papers

Interaction of bovine (BSA) and human (HSA) serum albumins with ionic surfactants: spectroscopy and modelling.

Spectroscopic studies on the interaction of bovine (BSA) and human (HSA) serum albumins with ionic surfactants

Interaction of the Tetra(4-sulfonatophenyl)porphyrin with Ionic Surfactants: Aggregation and Location in Micelles

Water Increases the Fluidity of Intercellular Membranes of Stratum Corneum: Correlation with Water Permeability, Elastic, and Electrical Resistance Properties

Interaction of Chlorpromazine and Trifluoperazine with Anionic Sodium Dodecyl Sulfate (SDS) Micelles: Electronic Absorption and Fluorescence Studies.