A study of surfactant micelles with a fluorescent probe

1976 ◽  
Vol 29 (1) ◽  
pp. 1 ◽  
Author(s):  
U Khuanga ◽  
BK Selinger ◽  
R McDonald
Keyword(s):  
Fluorescence Spectra ◽  
Electrolyte Concentration ◽  
Fluorescence Probe ◽  
Fluorescence Decay ◽  
Time Dependent ◽  
Ionic Surfactants ◽  
Simple Method ◽  
Surfactant Micelles ◽  
Full Analysis ◽  
Effect Of Oxygen

The fluorescence probe technique has been used to study micelles of anionic, cationic and non-ionic surfactants. The solute was pyrene. The formation of a fluorescent excited dimer (excimer) by pyrene means that this probe can be used not only to explore intramicellar kinetics, but also to monitor the manner in which micelles change their size. The change in size of ionic surfactants with electrolyte concentration and of non-ionic surfactants with temperature is explored. We have developed a simple method involving the effect of oxygen (in air) on the fluorescence spectrum for detecting statistical distribution effects in the solubilization of pyrene in micelles. The combination of fluorescence spectra with time-dependent fluorescence intensity (fluorescence 'decay') allows a full analysis.

scholarly journals Matching Effects in the Interaction of Ionic Surfactants with Fluorescent Reagents in Micellar Solutions of Triton X-100

2021 ◽  
Vol 16 (3) ◽  
pp. 117-126
Author(s):  
Viktoriia Klovak ◽  
Sergey Kulichenko ◽  
Serhii Lelyushok
Keyword(s):  
Fluorescence Spectra ◽  
Rhodamine 6G ◽  
Cetylpyridinium Chloride ◽  
Analytical Signal ◽  
Ionic Surfactants ◽  
Eosin Y ◽  
Surfactant Micelles ◽  
Fluorescence Maximum ◽  
Hydrophobic Matching ◽  
Triton X

The influence of cationic and anionic surfactant solutions on the character of the fluorescence spectra of reagents of different charge and hydrophobicity in aqueous solutions of nonionic surfactant Triton X-100 has been studied. An increase in the fluorescence intensity and a shift in the position of the fluorescence maximum with increasing hydrophobicity of reagents and ionic surfactants have been shown. The analytical signal of the surfactant is further amplified in the proximity of the charge values of the reagent and the counterion of the surfactant. The non-monotonic nature of the hydrophobicity effect of cationic surfactants on their analytical signal in the system has been shown. The observed effects are explained by the realization of charge and hydrophobic matching in the interaction of surfactants with the fluorescent reagents. The obtained effects are significant in the design of fluorescent systems for the determination and study of surfactant micelles. Conditions for detecting the content of cetylpyridinium chloride by reaction with eosin Y and sodium tetradecyl sulfate by reaction with rhodamine 6G in the presence of Triton X-100 were proposed. The methods have been tested in detecting the content of the ionic surfactants in pharmaceuticals.

An Introduction to Time-Resolved Pump/Probe Spectroscopy

1985 ◽  
Vol 39 (3) ◽  
pp. 444-451 ◽  
Author(s):  
F. E. Lytle ◽  
R. M. Parrish ◽  
W. T. Barnes
Keyword(s):  
Absorption Spectra ◽  
Ground State ◽  
Fluorescence Spectra ◽  
Excited State Absorption ◽  
Time Dependent ◽  
Triplet Excited State ◽  
Ground State Absorption ◽  
Time Resolved ◽  
Pump Probe ◽  
Probe Spectroscopy

The construction and operating principles of a two-color pump/probe spectrometer are described. This instrument is capable of obtaining ground-state absorption spectra, both singlet-singlet and triplet-triplet excited-state absorption spectra, photoproduct spectra, and stimulated fluorescence spectra. In addition, time-dependent measurements can be made with an impulse response of 250 ps and a free temporal range of 13 ns.

Supramolecular complexation between cucurbit[7]uril and folate and analytical applications

2021 ◽  
pp. 174751982110664
Author(s):  
Jue Chen ◽  
Tengmei Gao ◽  
Yinxia Chang ◽  
Yanming Wei ◽  
Yonghui Wang
Keyword(s):  
Fluorescence Spectra ◽  
Fluorescence Probe ◽  
H Nmr ◽  
Fluorescent Method ◽  
Inclusion Interaction ◽  
Spiked Plasma ◽  
Direct Fluorescence ◽  
Supramolecular Complexation

Folate (FA) plays a key role in the biosynthesis of amino acids, purines, and pyrimidines in the human body, and intracellular folate metabolism has become an attractive target of tumor chemotherapy. In this work, an inclusion interaction was found between FA and cucurbit[7]uril (CB[7]), and the formation of a CB[7]-FA 2:1 supramolecular inclusion complex was confirmed by fluorescence spectra, UV-Vis absorption spectroscopy, 1H NMR, and molecular modeling calculations. In addition, FA is generally determined through the indirect fluorescent method because it shows weak fluorescence in aqueous solution. Therefore, a simple, direct fluorescence probe method for rapidly measuring FA was investigated, and the linear equation of FA was ΔF = 14.691C + 37.366 within the concentration ranges of 0.82 ~ 18.31 µg mL–1. The proposed direct fluorescence method was applied to the determination of spiked plasma. We demonstrated that this method could provide an experimental basis for the targeted administration of the CB[7]-FA complex, and it could be extended as a promising fluorescence detection method for drugs in vivo.

Alpha Beta Discs

1983 ◽  
Vol 72 ◽  
pp. 55-67
Author(s):  
G.T. Bath ◽  
A.C. Edwards ◽  
V.J. Mantle
Keyword(s):  
Mass Transfer ◽  
Vertical Structure ◽  
Accretion Discs ◽  
Time Dependent ◽  
Simple Method ◽  
Dwarf Nova ◽  
Physical Conditions ◽  
Alpha Beta ◽  
Symbiotic Binaries

Following earlier work of Lynden-Bell & Pringle (1974) and Lightman (1974a, 1974b), Bath & Pringle (1981) have presented a simple method for studying the time-dependent evolution of viscous accretion discs. These models are axisymmetrlc, with the vertical structure reduced to integrated averages of local physical conditions. Published work examines models of dwarf nova eruptions driven by mass transfer bursts (Bath & Pringle 1981 – Paper I), eruptions produced by global viscous changes within the disc (Bath & Pringle 1982a Paper II), and the time-dependent properties of giant discs in symbiotic binaries (Bath & Pringle 1982b – Paper III).

scholarly journals Determination of an Effective Detector Position for Pulsed-Neutron-Source Alpha Measurement by Time-Dependent Monte Carlo Neutron Transport Simulations

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Sang Hoon Jang ◽  
Hyung Jin Shim
Keyword(s):  
Monte Carlo ◽  
Neutron Source ◽  
Neutron Transport ◽  
Signal Amplitude ◽  
Time Dependent ◽  
Convergence Time ◽  
Simple Method ◽  
Detector Position ◽  
Pulsed Neutron ◽  
Pulsed Neutron Source

A simple method using the time-dependent Monte Carlo (TDMC) neutron transport calculation is presented to determine an effective detector position for the prompt neutron decay constant (α) measurement through the pulsed-neutron-source (PNS) experiment. In the proposed method, the optimum detector position is searched by comparing amplitudes of detector signals at different positions when their α estimates by the slope fitting are converged. The developed method is applied to the Pb-Bi-zoned ADS experimental benchmark at Kyoto University Critical Assembly. The α convergence time estimated by the TDMC PNS simulation agrees well with the experimental results. The α convergence time map and the corresponding signal amplitude map predicted by the developed method show that polyethylene moderator regions adjacent to fuel region are better positions than other candidates for the PNS α measurement.

A Simple Method for Copper Ion Determination in Beverages Using Mn-Modified CdTe/CdS Quantum Dots as a Fluorescence Probe

2016 ◽  
Vol 16 (12) ◽  
pp. 12282-12287 ◽  
Author(s):  
Fangdi Wei ◽  
Hailin Yu ◽  
Chunting Hu ◽  
Zheng Cai ◽  
Jing Yang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Fluorescence Probe ◽  
Copper Ion ◽  
Cds Quantum Dots ◽  
Simple Method

scholarly journals The albumin–bilirubin score as a predictor of outcomes in Japanese patients with PBC: an analysis using time-dependent ROC

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Takanori Ito ◽  
Masatoshi Ishigami ◽  
Hikaru Morooka ◽  
Kenta Yamamoto ◽  
Norihiro Imai ◽  
...  
Keyword(s):  
Liver Transplantation ◽  
Roc Analysis ◽  
Japanese Patients ◽  
Hepatic Function ◽  
Time Dependent ◽  
Prognostic Scores ◽  
Primary Biliary Cholangitis ◽  
Simple Method ◽  
Mayo Score

Abstract The albumin–bilirubin (ALBI) score is calculated using only serum albumin and bilirubin levels, and was developed as a simple method to assess hepatic function. In this study, a total of 409 patients with primary biliary cholangitis (PBC) were enrolled between March 1990 and October 2018. The predictive performances of the ALBI score and other well-established prognostic scores were compared using time-dependent receiver operating characteristic (ROC) analysis. During the follow-up period, 60 patients died, 45 due to liver-related diseases and 15 due to non-liver-related diseases, and 16 patients underwent liver transplantation. Time-dependent ROC analysis showed that the ALBI score has higher the areas under the ROC curves (AUROCs) than the Child–Pugh (C–P) score at each time point; AUROCs at 3, 5, and 10 years after the start of follow-up were 0.94, 0.91, and 0.90 for the ALBI score, and 0.89, 0.88, and 0.82 for the C–P score, respectively. The ALBI score showed the highest AUROCs within 2 years after the start of observation; beyond 2 years, however, the Mayo score had better prognostic ability for mortality and liver transplantation. The ALBI score/grade, derived from objective blood tests, and the Mayo score were superior prognostic tools in PBC patients.

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