scholarly journals FLUORESCENCE CHARACTERISTICS OF FLUORESCEIN AND EOSIN Y SOLUTIONS IN WATER-MICELLAR SURFACTANT MEDIA

2020 ◽  
pp. 23-26
Author(s):  
V. Klovak ◽  
L. Nechpai ◽  
S. Lelyushok ◽  
S. Kulichenko
Keyword(s):  
Anionic Surfactant ◽  
Emission Intensity ◽  
Signal Intensity ◽  
Sodium Dodecyl ◽  
Fluorescence Emission ◽  
Ionic Surfactant ◽  
Eosin Y ◽  
Fluorescence Characteristics ◽  
Fluorescence Emission Intensity ◽  
Pharmacologically Active

The effect of cationic, anionic and nonionic surfactants on the fluorescence properties of fluorescein and eosin Y aqueous solutions has been investigated. It has been found that sodium dodecyl sulfate does not affect the position of the maximum wavelengths of solutions of fluorescein and eosin Y in the study of the effect of an anionic surfactant on the fluorescence emission intensity of dyes. The intensity of the signal of the dye solutions when changing the concentration of anionic surfactant changes little. As the concentration of non-ionic surfactant increases, the fluorescence emission intensity of the fluorescein solutions decreases. In contrast, with increasing concentration of Triton X-100, there is an increase in the signal intensity of solutions of more hydrophobic eosin Y with subsequent access to the "plateau" at СТХ-100≥5.1·10–2 mol/L. The position of the maxima fluorescence emission wavelengths for the fluorescein solutions in the 0-1.0·10–5 mol/L range of concentrations of cationic surfactant cetylpyridinium chloride remain unchanged. The position of the maxima shifts to the long-wavelength region of the spectrum at higher concentrations of CPC. The nature of the position dependence of the fluorescence emission maxima of eosin Y solutions in the presence of cationic surfactants is similar. The effect of fluorescence quenching has also been shown in the study of the influence of organic substances of cationic nature on the signal intensity of fluorescein solutions. It has been shown that the concentration dependence is linear in the (0.1–4.0)·10–1 mol/L range of isoniazid molecule concentrations. The data obtained can be implemented in the development of conditions and methods for the determination of pharmacologically active substances of cationic nature by reaction with fluorescein in medicines.

A Novel Embed Fluorescence Method for Monitoring the Change from Emulsion Polymeriztion to Microemulsion Polymerization

2013 ◽  
Vol 303-306 ◽  
pp. 323-328
Author(s):  
Hai Ke Feng
Keyword(s):  
Anionic Surfactant ◽  
Sodium Dodecyl Sulphate ◽  
Trace Amount ◽  
Sodium Dodecyl ◽  
Fluorescence Emission ◽  
Fluorescence Method ◽  
Water Soluble ◽  
Ionic Surfactant ◽  
Microemulsion Polymerization ◽  
Fluorescence Emission Intensity

In this paper, we present a novel embed fluorescence method that allows one to monitor the change from emulsion polymerization to microemulsion polymerization with low monomer contents. The microemulsion polymerization of methyl methacrylate (MMA) was investigated using N-(2-anthracene) methacrylamide (AnMA) as the probe whose fluorescence emission intensity was proportional to the conversion of MMA into the polymer.In this research, the trace amount of AnMA unit looked like embed in the MMA chain. In a solution containing 3wt% of MMA with respect to water, with the anionic surfactant of sodium dodecyl sulphate (SDS) and water-soluble initiator of potassium persulfate (KPS), the process of changing from emulsion to microemulsion has been monitored. By contrast, with the non-ionic surfactant of polyoxyethylene (20) oleyl ether (Brij98) or water-insoluble initiator of 2,2′-azobis(isobutyronitrile) (AIBN), the process of changing from emulsion to microemulsion also have been monitored.

Temperature Dependence of the Fluorescence Emission Intensity of Eu/TiO 2 Nanocrystals

2007 ◽  
Vol 24 (5) ◽  
pp. 1368-1371 ◽  
Author(s):  
Zeng Qing-Guang ◽  
Ding Ze-Jun ◽  
Ju Xin ◽  
Wang Yi ◽  
Sheng Ye-Qing
Keyword(s):  
Temperature Dependence ◽  
Emission Intensity ◽  
Fluorescence Emission ◽  
Fluorescence Emission Intensity

A sensitive fluorescence method for monitoring the kinetics of microemulsion polymerization

2010 ◽  
Vol 88 (3) ◽  
pp. 185-191 ◽  
Author(s):  
Haike Feng ◽  
Yi Dan ◽  
Yue Zhao
Keyword(s):  
Induction Period ◽  
Sodium Dodecyl ◽  
Fluorescence Emission ◽  
Fluorescence Method ◽  
Water Soluble ◽  
Polymerization Process ◽  
Ionic Surfactant ◽  
Microemulsion Polymerization ◽  
Measurement Results ◽  
Kinetics Of

We present a fluorescence method that allows one to monitor the kinetics of microemulsion polymerization of very low monomer contents (water-to-monomer ratio can readily be superior to 1000). The microemulsion polymerization of methyl methacrylate (MMA) was investigated using N-(2-anthracene)methacrylamide (AnMA) as the probe whose fluorescence emission intensity was proportional to the conversion of MMA into the polymer. The real-time-measurement results show that in the regime of very low monomer contents, the surfactant exerted a profound effect on the kinetic process. In a microemulsion containing 0.1 wt% of MMA with respect to water, with the anionic surfactant of sodium dodecyl sulfate (SDS), the fast polymerization was preceded by an induction period whose length increased with reducing the concentration of the water-soluble initiator of potassium persulfate (KPS). By contrast, with the non-ionic surfactant of polyoxyethylene (20) oleyl ether (Brij98), the induction period was short and the decrease in the KPS concentration mainly resulted in a decrease of the reaction rate. The unprecedented sensitivity of this fluorescence method made it possible to access kinetic data of microemulsion polymerization with very low monomer contents for the first time, providing new insight into the effects of surfactant and initiator on this heterophase polymerization process.

Reply to the ‘Comment on “Simple fluorescence-based detection of Cr(iii) and Cr(vi) using unmodified gold nanoparticles”’ by M. R. Hormozi-Nezhad, J. Mohammadi and A. Bigdeli, Anal. Methods, 2015, 7, DOI: 10.1039/c5ay00005j

2015 ◽  
Vol 7 (14) ◽  
pp. 6035-6036
Author(s):  
Sruthi Ann Alex ◽  
M. Elavarasi ◽  
D. Nanda Kumar ◽  
A. Rajeshwari ◽  
N. Chandrasekaran ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Emission Intensity ◽  
Fluorescence Emission ◽  
Fluorescence Emission Intensity

AuNP aggregation by Cr(iii) causes the reduction of the fluorescence emission intensity at 582 nm (λex = 490 nm).

scholarly journals Cloud Point Extraction Of Cationic Surfactants And Their Ionic Associates With Sodium Dodecyl Sulfate

2020 ◽  
Vol 15 (3) ◽  
pp. 111-116
Author(s):  
S.O. Lelyushok ◽  
V.O. Doroschuk ◽  
S. A. Kulichenko
Keyword(s):  
Cloud Point ◽  
Cationic Surfactant ◽  
Anionic Surfactant ◽  
Cationic Surfactants ◽  
Cloud Point Extraction ◽  
Sodium Dodecyl ◽  
Ionic Surfactant ◽  
Rich Phase ◽  
Ionic Associates ◽  
Extraction Degree

The distribution of individual cationic surfactants and their ionic associates with the anionic surfactant in the cloud point extraction systems, based on non-ionic surfactant OP-7 was investigated. Determined that the dependence of the extraction degree of halides alkylpyridiniums on carboxylic change length in optimal conditions for extraction is characterized by the existence of maximum for cationic surfactant where n = 12. Decrease as well as increase in carboxylic change length of cation of alkylpyridiniums diminishes the effectiveness of their extraction into the surfactant-rich phase. The peculiarities of inter phase distribution of ionic associates cationic surfactant – anionic surfactant in the micellar extraction systems are investigated. It was shown, that with the increase in carboxylic change length of cationic surfactant the dependence of extraction degree of associates with anionic surfactant is characterized by the existence of the maximum. Most effective into the surfactant-rich phase extracted of ionic associates of three- and tetradecylpyridinium. Decreasing and increasing of hydrophobicity of alkylpyridiniums diminishes the effectiveness of extraction of associates. The established effects are explained by the hydrophobic correspondence between the substrate and the surfactant-rich phase of non-ionic surfactant.

A study of fluorescence emission intensity of reaction products between selected amino acdis and DFO, 1,2-indanedione and 1,2-indanedione - zinc chloride

2014 ◽  
Vol 285 ◽  
pp. 68-72
Author(s):  
Tomasz Szczepański ◽  
◽  
Urszula Więckiewicz ◽  
Krzysztof Klemczak ◽  
Anna Chyczewska ◽  
...  
Keyword(s):  
Amino Acids ◽  
Fluorescence Intensity ◽  
Zinc Chloride ◽  
Emission Intensity ◽  
Storage Time ◽  
Spectral Characteristics ◽  
Fluorescence Emission ◽  
Reaction Products ◽  
Intensity Measurements ◽  
Fluorescence Emission Intensity

The study shows the results of fluorescence emission intensity measurements of the reaction products of selected amino acids with DFO, 1,2-IND and 1,2-IND - zinc chloride on absorptive surfaces. Conducted research addressed the following variables: type of developing reagent, type of surface, type of amino acid and sample storage time. It was confirmed that the above factors affected the fluorescence intensity of developed fingerprints. Furthermore, the studies proved that fluorescence intensity of reaction products between amino acids and 1,2- IND stored for 1 or 7 days increased for the majority of samples upon addition of zinc chloride to the developing reagent. For samples stored for 4 months the highest fluorescence emission intensity was observed for DFO. No significant differences were found in fluorescence spectral characteristics of tested compounds, depending on the type of surface.

Spectroscopic and Fluorometric Characterization of Oxacyanine Dyes in Water and Nitrobenzene

1988 ◽  
Vol 42 (6) ◽  
pp. 958-961 ◽  
Author(s):  
Deborah H. Wiegand ◽  
Petr Vanýsek
Keyword(s):  
Emission Intensity ◽  
Partition Coefficients ◽  
Fluorescence Emission ◽  
Red Shift ◽  
Electrochemical Studies ◽  
Interface System ◽  
Fluorescence Emission Intensity ◽  
20 Nm

The spectroscopic and fluorometric properties of nine oxacyanine dyes (3,3′-dimethyloxacarbocyanine through 3,3′-diheptyloxacarbocyanine, 3,3′-diethyl-, and 3,3′-dipropyloxadicarbocyanine iodides) were determined in two solvents, water and nitrobenzene. In nitrobenzene the absorbance and fluorometric spectra of the dyes showed a red shift of 15 to 20 nm when compared with the spectra in water. In addition, the fluorescence emission intensity of the dyes is lower in nitrobenzene than in water, by one to two orders of magnitude. Thus it is possible to measure fluorescence in water in water/nitrobenzene systems without interference from the nitrobenzene part. The molar absorptivities of the dyes were calculated and used to determine the solubility of the dyes in water and the partition coefficients of the dyes between nitrobenzene and water. These dyes were characterized in order to provide a better understanding of the properties of the dyes in a water/nitrobenzene interface system which will be used in electrochemical studies of the dyes.

Liquid Chromatographic-Fluorometric Determination of Cinnamyl Alcohol in Perfumes, Colognes, and Toilet Waters

1988 ◽  
Vol 71 (4) ◽  
pp. 821-823
Author(s):  
Harris H Wisneski ◽  
Ronald L Yates ◽  
John A Wenninger
Keyword(s):  
Emission Intensity ◽  
Fluorescence Emission ◽  
Water Mixture ◽  
Cinnamyl Alcohol ◽  
Fluorometric Determination ◽  
Short Column ◽  
Fluorescence Emission Intensity ◽  
Liquid Chromatographic

Abstract A liquid chromatographic (LC) method is described for the determination of cinnamyl alcohol (3-phenyl-2-propen-l-ol) in fragrance compositions. The fragrance product is partially cleaned up by diluting the fragrance with a 95% ethanol-water mixture and passing it through a short column containing RP-8 packing. An aliquot of the effluent is then analyzed by LC using an RP-18 column interfaced to a spectrophotofluorometer equipped with double monochromators. The fluorescence emission intensity of the eluted cinnamyl alcohol is measured and compared with that of a standard to calculate the amount of cinnamyl alcohol present. Recoveries from fragrance products fortified with cinnamyl alcohol at levels ranging from 0.0020 to 0.060 mg/mL ranged from 85 to 105% with a mean of 94%. The lowest level of determination was 0.0005 mg/mL.

Sign in / Sign up

Export Citation Format

Share Document