Fluorescent Properties of Zn-Al Hydrotalcite and its Modified Products

2010 ◽  
Vol 148-149 ◽  
pp. 1087-1090
Author(s):  
Ji Xin Su ◽  
Fei Fei Dong ◽  
Ming Bo Zhang ◽  
Shen Ping Zhang
Keyword(s):  
Citric Acid ◽  
Organic Compounds ◽  
Fluorescence Intensity ◽  
Adipic Acid ◽  
Interlayer Spacing ◽  
Fluorescence Property ◽  
Emission Wavelength ◽  
Excitation Wavelength ◽  
Fluorescent Properties ◽  
Maximum Emission

Zn-Al hydrotalcite exhibited fluorescence property without fluorescent substances intercalation. Its maximum excitation wavelength was 406nm and maximum emission wavelength was 523nm. In this study citric acid and adipic acid were introduced into the interlayer of LDH, which enlarged the interlayer spacing. It was found that the fluorescence property was influenced by anions in the interlayer of hydrotalcites. And it would be favorable to bind with other organic compounds to get photocatalysis materials for citric acid modified Zn-Al hydrotalcite. Meanwhile, the fluorescence intensity was enhanced greatly after modified by adipic acid, so it could be used as photocatalyst precursors.

scholarly journals Spectrofluorimetric Method for the Estimation of Erlotinib Hydrochloride in Pure and Pharmaceutical Formulations

2011 ◽  
Vol 8 (s1) ◽  
pp. S304-S308 ◽  
Author(s):  
V. Rajesh ◽  
V. Jagathi ◽  
K. Sindhuri ◽  
G. Devala Rao
Keyword(s):  
Fluorescence Intensity ◽  
Pharmaceutical Formulations ◽  
Dosage Forms ◽  
Emission Wavelength ◽  
Excitation Wavelength ◽  
Stability Studies ◽  
Pharmaceutical Dosage Forms ◽  
Spectrofluorimetric Method ◽  
Beer’S Law ◽  
Good Agreement

A simple and sensitive spectrofluorimetric method has been developed for the estimation of erlotinib hydrochloride in pure and pharmaceutical dosage forms. Erlotinib hydrochloride exhibits maximum fluorescence intensity in methanol and the Beer's law was obeyed in the range of 1-5 µg/mL at an excitation wavelength (λex) of 295 nm and an emission wavelength (λem) of 339 nm. Stability studies with respect to time and temperature were also carried out. The results obtained were in good agreement with the labelled amounts of the marketed formulations. This method has been statistically evaluated and found to be accurate and precise.

scholarly journals Ligand-modulated synthesis of gold nanoclusters for sensitive and selective detection of folic acid

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xiangfei Li ◽  
Juan Qiao ◽  
Yongjun Sun ◽  
Zhiwei Li ◽  
Li Qi
Keyword(s):  
Folic Acid ◽  
Charge Transfer ◽  
Gold Nanoclusters ◽  
Fluorescence Emission ◽  
Optical Measurements ◽  
Emission Wavelength ◽  
Excitation Wavelength ◽  
Core Shell ◽  
Fluorescent Properties ◽  
Fluorescence Efficiency

AbstractPrecisely changing the optical properties of gold nanoclusters (AuNCs) with different ligands offers a promising prospect for highly sensitive and selective drug sensing. In this study, AuNCs were synthesized with d-tryptophan (d-Trp) and its derivatives as the ligands. Optical measurements showed that d-Trp@AuNCs produced higher fluorescence intensity and shorter fluorescence emission wavelength than the d-Trp-derivatives-ligands protected AuNCs, indicating that the ligand-shell rigidity and core-shell charge transfer affected their fluorescent properties. At the excitation wavelength of 370 nm, the emission wavelength of d-Trp@AuNCs was 460 nm. The fluorescence changes revealed the high selectivity of d-Trp@AuNCs for detecting folic acid due to the static quenching and inner filter effect. In the presence of folic acid, the fluorescence of d-Trp@AuNCs was remarkably quenched with good linearity ranging from 6.3-100.0 μM (R2 = 0.997) and a detection limit of 5.8 μM. The proposed assay was successfully utilized to determine the amount of folic acid in human urine with recoveries from 94.3 to 107.3%. This work shows the great potential of d-Trp@AuNCs for detecting folic acid in real bio-samples. It also presents an effective strategy for preparation of the AuNCs with enhanced fluorescence efficiency by regulating the rigidity of the ligands shell and the core-shell charge transfer.

Synthesis and Luminescence Properties of Tb3+-Doped Hydroxyapatites

2011 ◽  
Vol 399-401 ◽  
pp. 1582-1587
Author(s):  
Su Ping Huang ◽  
Jun Zhu ◽  
Ke Chao Zhou
Keyword(s):  
Aspect Ratio ◽  
Fluorescence Intensity ◽  
Doping Concentration ◽  
Doping Content ◽  
Fluorescent Properties ◽  
Strong Fluorescence ◽  
Active Growth ◽  
Ph Values ◽  
Structure Morphology ◽  
Ultraviolet Ray

In this paper, the terbium -doped nano-HA powders with strong fluorescence was prepared by hydrothermal synthesis and its crystal structure，morphology and fluorescent properties are characterized by XRD, TEM, XPS, ICP and PL spectroscopy. Results showed that with the doping concentration of Tb3+increasing, the aspect ratio of Tb3+-doped HA particles decreased, while the fluorescence intensity excited by ultraviolet ray at 272 nm is significantly enhanced. With pH values increased from 6.5 to 10.0, the aspect ratio of Tb3+-doped HA decreased greatly, and the morphology of nano-Tb:HA particles changes from rod particles to equiaxed particles and the actual doping content and the fluorescence intensity tends to increase correspondingly, which can be explained that under alkaline solution, Tb3+was more easier entering the HA crystal, and the Tb3+would substitute the Ca2+ in both hydroxyapatite Ca(Ⅰ) and Ca(Ⅱ) site, which may block the active growth sites of the seed crystals and resulted in the growth rate and the ratio of length to radius decreasing.

scholarly journals A novel tandem differential mobility analyzer with organic vapor treatment of aerosol particles

2001 ◽  
Vol 1 (1) ◽  
pp. 51-60 ◽  
Author(s):  
J. Joutsensaari ◽  
P. Vaattovaara ◽  
M. Vesterinen ◽  
K. Hämeri ◽  
A. Laaksonen
Keyword(s):  
Water Vapor ◽  
Sodium Chloride ◽  
Citric Acid ◽  
Ammonium Sulfate ◽  
Adipic Acid ◽  
Aerosol Particles ◽  
Ethanol Vapor ◽  
Differential Mobility Analyzer ◽  
Differential Mobility ◽  
Organic Vapor

Abstract. A novel method to characterize the organic composition of aerosol particles has been developed. The method is based on organic vapor interaction with aerosol particles and it has been named an Organic Tandem Differential Mobility Analyzer (OTDMA). The OTDMA method has been tested for inorganic (sodium chloride and ammonium sulfate) and organic (citric acid and adipic acid) particles. Growth curves of the particles have been measured in ethanol vapor and as a comparison in water vapor as a function of saturation ratio. Measurements in water vapor show that sodium chloride and ammonium sulfate as well as citric acid particles grow at water saturation ratios (S) of 0.8 and above, whereas adipic acid particles do not grow at S <  0.96. For sodium chloride and ammonium sulfate particles, a deliquescence point is observed at S = 0.75 and S = 0.79, respectively. Citric acid particles grow monotonously with increasing saturation ratios already at low saturation ratios and no clear deliquescence point is found. For sodium chloride and ammonium sulfate particles, no growth can be seen in ethanol vapor at saturation ratios below 0.93. In contrast, for adipic acid particles, the deliquescence takes place at around S = 0.95 in the ethanol vapor. The recrystallization of adipic acid takes place at S < 0.4. Citric acid particles grow in ethanol vapor similarly as in water vapor; the particles grow monotonously with increasing saturation ratios and no stepwise deliquescence is observed. The results show that the working principles of the OTDMA are operational for single-component aerosols. Furthermore, the results indicate that the OTDMA method may prove useful in determining whether aerosol particles contain organic substances, especially if the OTDMA is operated in parallel with a hygroscopicity TDMA, as the growth of many substances is different in ethanol and water vapors.

Synthesis of a Photochromic Diarylethene Having Thiazole and a Pyridyl Group for Optical Recording

2010 ◽  
Vol 156-157 ◽  
pp. 650-654 ◽  
Author(s):  
Hui Li ◽  
Yong Liang Xia ◽  
Shou Zhi Pu ◽  
Shi Qiang Cui
Keyword(s):  
Fluorescence Intensity ◽  
Optical Storage ◽  
Optical Recording ◽  
Pmma Film ◽  
Fluorescent Properties ◽  
Strong Fluorescence ◽  
Pyridyl Group ◽  
Open Ring

A new unsymmetrical photochromic diarylethene namly 1-(2,4-dimethyl-5- thiazolyl)-2- [(2-methyl-5-(2-pyridyl)-3-thienyl)]perfluorocyclopentene was synthesized, and its photochromic and fluorescent properties were also investigated. The compound exhibited good photochromism both in solution and in PMMA film. In PMMA film, The open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence at 427 nm when excited at 320 nm. The fluorescence intensity declined along with the photochromism upon irradiation with 297 nm light. Using this dithienylethene 1b as optical storage was performed successfully.

Fluorometric Method for Determination of 1,2-Unsaturated Aldehydes in Autooxidized Lipids with 2,4-Diaminotoluene

1990 ◽  
Vol 73 (4) ◽  
pp. 590-594
Author(s):  
Teruhisa Hirayama ◽  
Shinji Miura ◽  
Mariko Araki ◽  
Yoshiko Takeo ◽  
Tetsushi Watanabe
Keyword(s):  
Methyl Oleate ◽  
Acidic Condition ◽  
Emission Wavelength ◽  
Excitation Wavelength ◽  
Fluorometric Method ◽  
Unsaturated Aldehydes ◽  
Liquid Chromatographic

Abstract A simple fluorometric method has been developed to determine 1,2-unsaturated aldehydes in autooxidized lipids. 1,2- Unsaturated aldehydes were allowed to react with 2,4-diamlnotoluene in acidic condition and the products, 7-amlno-6- methylqulnoline derivatives, were determined by a fluorometric procedure at 394 nm (excitation wavelength) and 494 nm (emission wavelength). Finally, 1902.9, 1738.8, and 2149.2 μg/g of 1,2-unsaturated aldehydes as 2-propenal were detected in 20-h autooxidized methyl oleate, methyl llnoleate, and methyl llnolenate, which contained 98.5, 223.2, and 355.6 μg/g, respectively, of thlobarblturlc acid reactive substances as malondialdehyde. In a preliminary liquid chromatographic LC determination of 2-propenal In autooxidized lipids, 29, 20, and 57 μg/g, respectively, of 2- propenal were detected In 20-h autooxidized methyl oleate, methyl llnoleate and methyl llnolenate. The 2-propenal can be detected as 7-amlno-6-methylqulnoline by using LC-fluorometrlc procedure at levels of 100 pg.

Utilising an anilido-imino ligand to stabilise zinc-phosphanide complexes: reactivity and fluorescent properties

2019 ◽  
Vol 48 (23) ◽  
pp. 8094-8105
Author(s):  
Dylan Webb ◽  
J. Robin Fulton
Keyword(s):  
Fluorescence Intensity ◽  
Zinc Complexes ◽  
Ancillary Ligand ◽  
Fluorescent Properties

Anilido-imino-based ligands have been used to generate new zinc complexes, including rare zinc phosphanide and phosphinodichalcogenoate complexes. The fluorescence intensity of these compounds is highly dependent upon the non-ancillary ligand.

L-Histidine Stabilized Copper Nanoclusters as a Fluorescence Probe for Determination of Fluazinam

NANO ◽  
2020 ◽  
Vol 15 (05) ◽  
pp. 2050063
Author(s):  
Zhifeng Cai ◽  
Xiu Yin ◽  
Jingling Fang ◽  
Jie Zhao ◽  
Tianqi Wu ◽  
...  
Keyword(s):  
Fluorescence Intensity ◽  
Photoelectron Spectroscopy ◽  
Water Solubility ◽  
Fluorescence Probe ◽  
Synthesis Method ◽  
Fluorescence Emission ◽  
Average Diameter ◽  
High Dispersion ◽  
Excitation Wavelength ◽  
One Pot

In this contribution, a one-pot synthesis method possessing the advantages of simple, green and low-cost had been researched for the preparation of L-histidine-stabilized Cu nanoclusters (Cu NCs). Subsequently, the structure and optical properties of as-prepared Cu NCs were studied by using Fourier transform infrared (FTIR), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), fluorescence spectroscopy and UV-Vis absorption spectroscopy. TEM image of the Cu NCs showed high dispersion with an average diameter of 2.0[Formula: see text]nm. Fluorescence spectrum displayed that the Cu NCs emitted green fluorescence (emission wavelength of 492[Formula: see text]nm) under excitation wavelength of 393[Formula: see text]nm. Moreover, the as-synthesized Cu NCs illustrated excellent performances, such as good water solubility, UV stability and high-salt resistance. Interestingly, the fluorescence intensity of as-prepared Cu NCs was obviously quenched in the presence of fluazinam. Under optimal conditions, the relative fluorescence intensity was linear with the fluazinam concentrations from 1 to 40[Formula: see text][Formula: see text]M, with a detection limit of 0.25[Formula: see text][Formula: see text]M. Eventually, the fluorescence sensor was successfully used to determine fluazinam in real water samples.

Study on Three-Dimensional Fluorescence Spectra of Oil Concentration in Water

2011 ◽  
Vol 322 ◽  
pp. 144-147
Author(s):  
Yu Tian Wang ◽  
Li Li Yang ◽  
Xin Qiong Lu
Keyword(s):  
Quantitative Analysis ◽  
Fluorescence Intensity ◽  
Fluorescence Spectra ◽  
Three Dimensional ◽  
Measurement Model ◽  
Excitation Wavelength ◽  
Experimental Basis ◽  
Oil In Water ◽  
Oil Concentration ◽  
Fluorescence Spectrometer

According to the Lambert-Beer laws, the fluorescence spectra of oil in water were investigated by measuring excitation-emission matrixes with FS920 fluorescence spectrometer. On the basis of the three-dimensional fluorescence spectra of oil in water, the excitation wavelength of 290nm and emission wavelength of 324nm were chosen for the quantitative analysis of oil in water. The results show that the concentration of oil in water is linearly proportional to the fluorescence intensity in the range of 1ppm-100ppm, and the measurement model of concentration is obtained with the linear correlation coefficient of 0.9993. The artificial samples has also been tested and the results are satisfactory. The recovery is in the range of 92%-106%. The research provides experimental basis for the quantitative analysis of multi-component oil in water.

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